Transactional and marketing email services.
Tool | Category | Segment | Platform / Tool | Plan / License | Monthly Price USD | Pricing Model | Free Tier / OSS | Included Usage / Limits | Email Types / Channels | Contacts / List Management | Automation / Personalization | Templates / AI / Content Tools | Integrations / Developer API | Deliverability / Compliance | Team / Governance | Best Fit | Main Limits / Caveats |
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No tagline | Marketing / Email | Developer email API and marketing email | Resend | Commercial SaaS | $0 Free; Pro from $20/month; Scale from $90/month | Transactional email volume plus contact-based marketing email | ✓ | Free includes 3,000 transactional emails/month with 100/day cap, 1 domain, 1 webhook endpoint, 30-day retention, 10,000 automation runs and marketing email to up to 1,000 contacts | Transactional, inbound, marketing broadcasts and automations | Marketing contacts are counted separately from transactional quota; free marketing is up to 1,000 contacts | Automations, scheduled emails, batch sending, open/link tracking and 10,000 automation runs/month | React Email, AI credits, templates through developer workflow | REST API, SMTP relay, official SDKs, webhooks, React Email and framework integrations | SPF/DKIM/DMARC, suppression, bounce handling, SOC 2 Type II and GDPR noted on pricing table | Scale/Enterprise add Slack support, flexible domains, dedicated IP add-on, SSO and flexible retention | Developers who need one modern email API plus lightweight marketing emails | Free plan has no overage and 100/day cap; marketing email is contact-based and separate from transactional plans |
No tagline | Marketing / Email | SaaS email platform for product teams | Loops | Commercial SaaS | $0 Free; paid plans from $49/month | Contact and send limits; paid plans include unlimited transactional email | ✓ | Free plan stores up to 1,000 contacts and sends up to 4,000 emails every 30 days; paid plans start at $49/month with unlimited transactional sends | Marketing emails and transactional product emails | Contacts are marketing recipients; transactional-only recipients do not count unless they also receive marketing emails | Lifecycle campaigns, product-triggered messaging, workflows and customer journeys | No-code editor and startup SaaS oriented email templates | API, webhooks, product event integrations and developer-friendly setup | Managed deliverability; branding on free emails | Paid plans unlock higher contact tiers and production support | Early-stage SaaS teams that want marketing and product emails in one simple product | Free plan has Loops branding and combined send cap; pricing jumps at the paid threshold |
No tagline | Marketing / Email | Transactional email delivery | Postmark | Commercial SaaS | Free Developer plan; paid tiers by volume | Monthly email-volume pricing | ✓ | Official support says new accounts start on a free Developer plan with 100 emails/month | Transactional email and message streams; broadcast stream available for non-transactional product notices | Suppression lists, servers, streams and activity retention by plan | No-code marketing automation is not the focus; transactional templates and streams are central | Transactional templates, layouts and message-stream content tools | REST API, SMTP, official SDKs and webhooks | Strong deliverability positioning, message streams, bounce/spam handling and DMARC/DKIM/SPF | Team permissions and account controls on paid product; enterprise needs plan review | Product teams prioritizing reliable transactional delivery over newsletter marketing | Free allowance is only 100 emails/month; not a full marketing newsletter suite |
No tagline | Marketing / Email | Minimal newsletter platform | Buttondown | Commercial SaaS | $0 for first 100 subscribers; add-ons from $9/month | Active-subscriber pricing plus optional feature add-ons | ✓ | Official pricing says the first 100 subscribers cost nothing; pricing page also lists optional add-ons such as segmentation, paid subscriptions, analytics, RSS-to-email and automations | Newsletters and paid newsletter emails | Active subscriber management, hosted archives, custom domain sending and privacy-first portal | Automations, tagging, segmentation, surveys and RSS-to-email are paid add-ons | Rich-text and Markdown editor, hosted archives and developer-friendly publishing flow | API, CLI-style Markdown workflows, integrations and custom domain support | Privacy-first positioning, subscriber portal and unsubscribe management | Teams and white-labeling are higher-cost add-ons | Writers and technical creators who want a clean newsletter tool without platform take rate | Free tier is only 100 subscribers and many advanced features are modular paid add-ons |
No tagline | Marketing / Email | Newsletter growth and monetization platform | beehiiv | Commercial SaaS | $0 Launch; Scale from $49/month; Max from $109/month | Subscriber-tier pricing; unlimited sends on all plans | ✓ | Launch/free supports up to 2,500 active subscribers; official help confirms paid tiers use subscriber plan tiers and the free/trial sending cap follows Launch limits | Newsletters, web publication posts, paid newsletters and monetization emails | Active subscriber based pricing, publication management and audience growth tools | Automations, referral program, polls, recommendations and monetization on paid tiers | Newsletter editor, website/publication builder, analytics, podcast/audio features on higher tiers | API on higher tiers, website, recommendations, ad network and integrations | Managed sending; 0% platform take on paid subscriptions in beehiiv positioning; Stripe fees apply | Max/Enterprise add advanced analytics, priority support, API access and newsroom/team features | Publishers building newsletter-first media businesses with growth and monetization tooling | Free plan is capped at 2,500 active subscribers and some monetization/automation features require Scale |
No tagline | Marketing / Email | Transactional email platform | MailerSend | Commercial SaaS | $0 Free; Hobby from low monthly tier; Starter/Professional for 50,000+ emails | Monthly email limit with overage on paid plans | ✓ | Official pricing page says Free plan is 500 emails/month; Hobby is 5,000 emails/month; Starter/Professional begin at 50,000 emails and above | Transactional emails, inbound routing and SMS through MailerSend ecosystem | Recipients, domains, templates and activity tracking for transactional use | Transactional routing, inbound parsing and webhook-driven workflows | Template builder, dynamic templates and email verification access | API, SMTP, SDKs, webhooks and inbound routing | Domain authentication, suppression, activity retention and deliverability features | Team access, roles and support levels vary by paid tier | Developers who want a transactional provider from the MailerLite family | Free plan no longer matches older 3,000-email claims; overage is not available on Trial/Free |
No tagline | Marketing / Email | Open-source hosted email platform | Plunk | AGPL-3.0 open source plus hosted SaaS | $0 Free; $0.001/email pay-as-you-grow | Per-email hosted billing; self-host for infrastructure cost | ✓ | Hosted free tier includes 1,000 emails/month, transactional emails, workflow automation, campaign broadcasts, custom domains, tracking and unlimited contacts with Plunk branding | Transactional, campaign broadcasts and workflow automation | Unlimited contacts on hosted plans; segmentation and behavior attributes | Workflow automation with delays, conditions and branching | Templates, campaign broadcasts and API-driven content | REST API, SMTP, SDKs and self-host Docker path | EU-hosted/GDPR positioning; self-hosting gives full data ownership | No feature tiers; hosted account controls and self-hosted governance depend on deployment | Developers who want transparent hosted email pricing with an open-source escape hatch | Free plan includes branding; self-hosting removes per-email vendor cost but requires deliverability infrastructure |
No tagline | Marketing / Email | Cloud email infrastructure | Amazon SES | AWS managed service | $0 free tier for first 12 months; $0.10 per 1,000 outbound emails after/over free tier | Pay-as-you-go message pricing | ✓ | AWS pricing says SES free tier includes up to 3,000 message charges/month for 12 months after starting SES; outbound is $0.10/1,000 emails and inbound is also message based | Outbound transactional/bulk email, inbound email and deliverability manager features | No native newsletter CRM; lists/contacts must be managed by app or another tool | Automation requires app code or external marketing platform | Raw email/API/SMTP templates through AWS workflows | AWS SDKs, SMTP, IAM, CloudWatch, SNS, Lambda and event publishing | AWS IAM, DKIM/SPF/DMARC, reputation dashboard, sandbox/production access and deliverability add-ons | AWS account/IAM governance, quotas, regions and enterprise support | Engineering teams that want very low-cost raw email infrastructure | Requires building list management, unsubscribe compliance, templates and analytics yourself or using another product |
No tagline | Marketing / Email | Open-source marketing automation | Mautic | Open-source GPLv3 project | $0 software; hosting/email infrastructure costs separate | Self-hosted open-source marketing automation | ✓ | Official GitHub describes Mautic as free/open-source and self-hostable forever, with unlimited segmentation and automation depending on your infrastructure | Email marketing, campaigns and multi-channel marketing automation | Contacts, segments, lead scoring and CRM/CMS integrations | Campaign builder, drip/nurture automation, personalization and scoring | Email templates, landing pages, forms and campaign assets | Plugins, API, CRM/CMS integrations and self-hosted deployment | Privacy-focused and digitally sovereign positioning; data stays in your own infrastructure when self-hosted | Community governance, open-source contribution model and self-hosted admin roles | Organizations wanting full marketing automation without SaaS lock-in | Requires hosting, upgrades, email delivery provider and admin expertise |
No tagline | Marketing / Email | Low-cost newsletter platform | EmailOctopus | Commercial SaaS | $0 Starter; Pro starts at $9/month billed yearly | Subscriber and email-volume tiers | ✓ | Starter is free for 2,500 subscribers and 10,000 emails/month with EmailOctopus branding, 30-day reports, 1 landing page, 1 form and 1 user | Newsletter campaigns and basic automations | Subscribed contacts drive pricing; unsubscribed/bounced contacts do not count, but duplicates across lists can count multiple times | Basic automations on free; Pro unlocks more control and permanent reports | Drag-and-drop editor, 100+ templates, HTML imports, landing pages and forms | API, integrations and EmailOctopus Connect with Amazon SES | Anti-spam terms, branding on free and managed campaign delivery | Free is 1 user; Pro adds unlimited users and unlimited forms/landing pages | Newsletter senders who want a generous free tier and simple pricing | Free reports expire after 30 days and branding remains; duplicate list strategy matters for billing |
No tagline | Marketing / Email | All-in-one email marketing suite | Mailchimp | Commercial SaaS | $0 Free; Essentials from $13/month; Standard from $20/month | Contact-tier pricing with monthly send limits | ✓ | Official help states Free includes up to 250 contacts, 500 sends/month and 250 daily send limit; paid plans start from 500-contact tiers | Marketing emails, automations, landing pages, forms, SMS add-ons and transactional email through separate Mandrill path | Audience/contact database, segmentation, signup forms and CRM-style audience tools | Customer journeys, automations, segmentation and A/B testing depending plan | Email templates, Creative Assistant and generative AI on paid feature tiers | Website/forms, ecommerce integrations, API and transactional add-on ecosystem | Compliance tooling, unsubscribe handling and domain authentication | Seats and permission levels vary by plan; Premium adds advanced team support | Mainstream small-business email marketing with broad integrations | Free plan is now very small; contacts and test/transactional sends count toward limits |
No tagline | Marketing / Email | Transactional email API | Mailgun | Commercial SaaS | $0 Free; paid plans available | Daily-message free plan and paid tiers | ✓ | Official help says Free plan requires no credit card and includes 100 messages/day, 1 custom domain, 1-day logs/events retention, 1 inbound route, 2 API keys, analytics and ticket support | Transactional email, SMTP/API sending, receiving and routing | Domain-level sending setup, suppression and event/log data | Primarily API-driven transactional workflows; marketing campaigns require surrounding tooling | Templates and email validation/deliverability features depending plan | REST API, SMTP, webhooks, inbound routes and common framework integrations | Domain verification, logs/events, deliverability analytics and Sinch/Mailgun compliance controls | Higher plans/custom contracts add more domains, retention, support and dedicated IP options | Developers needing API/SMTP delivery and inbound email routing | Free plan is tiny and log retention is only 1 day; marketing list management is not the main product |
No tagline | Marketing / Email | Data-driven customer messaging | Customer.io | Commercial SaaS | Essentials starts at $100/month; Premium starts at $1,000/month yearly | Profile, email volume and channel pricing | Startup program | Essentials includes 5,000 profiles, 1M monthly emails, 2 object types, visual workflow builder, AI Agent core skills and 100K LLM credit sample; startup program offers 12 months free for eligible startups | Email, transactional emails, push, in-app, webhooks, SMS, WhatsApp and LINE | Profiles, people/objects, unlimited attributes, segments, custom objects and data index | Visual workflow builder, cross-channel campaigns, send-time optimization and LLM actions | Design Studio with visual/code editors, AI-generated styles, AI translator and content analysis | API, MCP server, data warehouse/reverse ETL, webhooks and integrations | US/EU data centers, SOC 2, SSO/2FA and managed deliverability on higher plans | Unlimited user seats; workspaces, RBAC, audit logging and data governance on higher tiers | B2B SaaS and product teams with complex lifecycle messaging | Expensive compared with newsletter tools; free path is startup eligibility/trial rather than broad permanent free tier |
No tagline | Marketing / Email | Newsletter and automation platform | MailerLite | Commercial SaaS | $0 Free; Growing Business from $10/month; Advanced from $20/month | Subscriber-count pricing | ✓ | Free plan supports up to 500 subscribers, 12,000 monthly emails, 1 user, automation builder, websites, 10 landing pages, signup forms and pop-ups | Newsletters, marketing emails, automation emails and transactional email as separate product tab | Subscriber management, groups, segments, signup forms, pop-ups, landing pages and websites | Email automation builder, comparative reporting, smart sending on Advanced | Drag-and-drop editor, templates, websites, digital products and bookings | Integrations, API, forms, landing pages and newer AI/MCP-oriented workflows | Managed sending with DKIM/domain setup; support limits vary by plan | Advanced/Enterprise add unlimited seats, dedicated success and deliverability support | Creators and small businesses needing affordable newsletters, forms and simple automation | Free subscriber cap was reduced to 500; live chat support is limited after trial on free plan |
No tagline | Marketing / Email | Email API and marketing campaigns | Twilio SendGrid | Commercial SaaS | Free trial; paid usage-based plans | Volume-based Email API plus marketing contact/send plans | Trial | Official pricing says after creating a sender identity, the free trial can send up to 100 emails/day and store up to 100 contacts; support docs describe a 60-day free trial cap | Transactional email API, SMTP relay and marketing campaigns | Marketing Campaigns contact storage and list management; Email API is volume based | Marketing automations and email API workflows depending product path | Dynamic templates, design editor, testing and email validation add-ons | REST API, SMTP, webhooks, SDKs and Twilio ecosystem | Deliverability analytics, sender authentication, dedicated IPs on paid tiers and suppression handling | Additional teammates and enterprise controls on higher plans | Companies needing a mature transactional email API with marketing campaign option | Free path is a time-limited trial, not a permanent free tier; SendGrid content is moving under Twilio branding |
No tagline | Marketing / Email | Creator newsletter platform | Kit | Commercial SaaS | $0 Newsletter; Creator from about $39/month; Creator Pro from about $79/month | Subscriber-count pricing for creator email marketing | ✓ | Official help states the Newsletter plan lets creators manage up to 10,000 subscribers for free | Newsletters, broadcasts, sequences, paid newsletters and creator commerce | Tags, subscribers, forms, landing pages and creator audience tools | One automation on free; visual automations, sequences and advanced reporting on paid tiers | Landing pages, forms, broadcasts, commerce and creator-network growth tools | Creator integrations, API, webhooks and ecommerce/commerce integrations | Managed deliverability and creator-focused compliance features | Creator Pro adds deeper reporting, referral tools and collaboration-oriented features | Creators who need a large free subscriber ceiling before monetizing | Free plan is generous but limited on automation/support; paid tiers become steep as the list grows |
No tagline | Marketing / Email | Creator publishing and paid newsletter platform | Substack | Commercial publishing platform | $0 monthly platform fee; 10% platform fee on paid subscriptions | Revenue share instead of seat/subscriber subscription | ✓ | Official support says Substack is free to use for writers; Substack takes a cut when paid subscriptions are enabled, plus Stripe processing and billing fees | Email newsletters, posts, podcasts, video, chat and paid subscription emails | Subscriber list, publication homepage, free/paid subscribers and reader network | Basic publication workflows, recommendations and paywall/membership mechanics | Post editor, publication site, podcast/video publishing and paid content tools | Stripe payments, embeds, import/export and Substack network | Managed email delivery and payments; creator data portability and platform policies need review | Primarily creator/publication account controls rather than enterprise team governance | Writers who want zero upfront cost and built-in monetization/network effects | 10% platform fee is expensive at scale; less flexible than owning a list on a standalone ESP |
No tagline | Marketing / Email | All-in-one email and CRM marketing | Brevo | Commercial SaaS | $0 Free; Starter from $9/month; Standard from $18/month | Email-volume pricing with contact storage limits by tier | ✓ | Free plan has 300 daily email sends, 100,000 contacts storage, 1 user, email/SMS campaigns, transactional email/SMS, drag-and-drop editor, automation up to 2,000 contacts and Aura AI | Marketing email, transactional email, SMS, WhatsApp, chat and CRM-adjacent channels | Large free contact storage; segmentation, forms and CRM-style contact records | Basic automation on free; more advanced automation and analytics on higher tiers | Drag-and-drop editor, reusable sections, custom templates, AI content generator/Aura AI | API, SMTP, transactional email, webhooks and app integrations | Consent tooling, deliverability features and Brevo sender infrastructure | Free is single-user; higher plans add more support, add-ons and enterprise options | Small businesses that want email marketing plus transactional email and CRM basics | Free plan is constrained by daily sends; removing branding and advanced automation require paid tiers/add-ons |
No tagline | Marketing / Email | Self-hosted newsletter manager | listmonk | AGPL open source | $0 software; SMTP/infrastructure costs separate | Self-hosted software | ✓ | Official site describes listmonk as free and open source; v6.1.0 released Mar 29 2026; supports millions of subscribers and multi-SMTP queues | Newsletters, mailing lists and transactional messages through API/Messenger interfaces | Subscriber lists, double opt-in, SQL segmentation, media library and privacy controls | Campaign scheduling, templates, transactional API and messenger webhooks | Go templates, visual/WYSIWYG/Markdown/raw HTML editors and dynamic subject/content logic | REST API, webhooks, SMTP relays, Docker and Postgres | Self-hosting controls data; OIDC SSO, roles, granular API tokens and S3 media backend are documented | Roles, permissions and OIDC for self-hosted team governance | Technical teams wanting a powerful free self-hosted Mailchimp alternative | You must bring SMTP/deliverability, hosting and operations; no managed support included |
No tagline | Marketing / Email | Ecommerce email and SMS automation | Omnisend | Commercial SaaS | $0 Free; Standard from $16/month; Pro from $59/month | Contact-count tiers with email/SMS allowances | ✓ | Official help says Free allows 500 emails/month; Standard sends are contacts x12 and Pro has unlimited emails; Free users are prompted to upgrade when they hit 500 emails | Email, SMS, push notifications and ecommerce marketing automation | Ecommerce contacts, segments, product/customer data and Shopify-style lists | Prebuilt ecommerce workflows, abandoned cart, welcome, win-back and segmentation | Email builder, AI email writer, templates, product picker and campaign tools | Shopify/WooCommerce/BigCommerce and ecommerce integrations plus API | Managed deliverability, consent and ecommerce compliance features | Paid tiers add live chat/priority support, reporting and higher-volume features | Online stores that need email/SMS automation without enterprise complexity | Free sends are limited to 500/month and branding remains; pricing rises with contact list size |
No tagline | Marketing / Email | Email marketing for small teams | Benchmark Email | Commercial SaaS | $0 Free; Pro from $19/month | Contact and send-count pricing | ✓ | Official help says Free is limited to 500 contacts, 1 private domain and 2,500 sends/month; Pro has 10x contact limit sends and additional users at cost | Email campaigns and newsletters | Contacts, lists, segments and one private domain on free | Basic campaign workflows; full marketing automation is limited compared with heavier platforms | Drag-and-drop editor, templates, Smart Text/Smart Images AI features and reporting | Integrations, forms and API paths | Managed deliverability, list verification and unsubscribe handling | Pro adds more users at extra cost; Enterprise custom | Small teams wanting a simple free email campaign tool with predictable limits | Automation and A/B depth are limited; free plan has only owner user and 500-contact cap |
No tagline | Marketing / Email | Ecommerce email and SMS marketing | Klaviyo | Commercial SaaS | $0 Free; paid plans scale by active profiles and sends | Active profile and email/SMS send pricing | ✓ | Official pricing/help says free plan includes up to 250 active profiles, 500 email sends/month and 150 mobile message credits/month, plus editors, automations, segments and reports | Email, SMS/MMS and ecommerce lifecycle messaging | Active profiles, ecommerce data sync, segments and reports | Flows, automations, segmentation, predictive/ecommerce personalization and reporting | Drag-and-drop email/SMS editors, templates and ecommerce content blocks | Shopify and ecommerce integrations, APIs, webhooks and data sync | Consent tools, deliverability features, domain authentication and ecommerce compliance controls | Paid plans add support and business controls; enterprise features require plan review | Ecommerce brands needing deep Shopify/customer-data email and SMS automation | Free cap is small and billing scales with active profiles; suppressed/profile management matters |
No tagline | Marketing / Email | Email marketing and automation suite | Moosend | Commercial SaaS | 30-day free trial; paid plans subscriber based | Subscriber-count pricing; no permanent free plan captured | Trial | Official pricing says users can try core features with a 30-day free trial, no credit card required; docs also confirm the 30-day free trial subscription | Email campaigns, automation, transactional emails and SMTP server | Subscriber/contact management, segmentation and forms | Email marketing automation, onsite tracking and behavior-based campaigns | Campaign editor, landing pages, subscription forms and custom reports | SMTP, transactional email, integrations and API | Managed delivery, dedicated IPs on higher plans and compliance tools | Moosend+ and Enterprise add SSO/SAML, account manager and custom reports | Teams evaluating a full email marketing automation suite before paying | No permanent free plan in official pricing; exact paid monthly amount is dynamic by contacts |
No tagline | Marketing / Email | Self-hosted newsletter app | Sendy | Commercial self-hosted software | One-time license; SES sends about $1 per 10,000 emails | Self-hosted app plus Amazon SES usage | No SaaS free tier captured | Official site positions Sendy as a one-time payment self-hosted newsletter platform powered by Amazon SES, with bulk email at about $1 per 10,000 emails | Newsletter campaigns and autoresponders via Amazon SES | Lists, subscribers, segmentation, unsubscribe/bounce handling and brand/client accounts | Autoresponders, segmentation and campaign scheduling | HTML email editor/templates and campaign reports | Amazon SES, Zapier/webhooks/API paths and self-hosted PHP/MySQL deployment | Data is self-hosted; deliverability depends on Amazon SES/domain setup | Client/brand management for agencies; governance depends on self-hosted install | Cost-sensitive technical users who can self-host and use Amazon SES | Requires server maintenance and AWS SES setup; no managed deliverability/support like full SaaS ESPs |
No tagline | Marketing / Email | Email marketing and automation platform | Sender | Commercial SaaS | $0 Free; paid subscriber-based plans | Subscriber-based paid plans | ✓ | Official site states Free Forever covers 2,500 subscribers and up to 15,000 emails/month; help docs describe subscriber-based pricing for paid plans | Email marketing, automation, SMS marketing and transactional emails | Subscriber lists, segmentation, forms, popups and landing pages | Email automation, marketing automation, abandoned cart and behavior-based flows | Templates, drag-and-drop builder, popups, landing pages and campaign analytics | Ecommerce integrations, API and transactional email paths | Managed sending, unsubscribe handling and deliverability features | Paid plans add seats, remove branding and unlock more templates/landing pages/A/B testing | Small businesses needing a generous free email marketing tier | Pricing details are partly dynamic; verify paid tier cost with the slider for exact subscriber count |
No tagline | Marketing / Email | Newsletter publishing and memberships | Ghost(Pro) | Open-source Ghost plus managed Ghost(Pro) | Starter $18/month billed yearly; Publisher $29/month; Business $199/month | Member-count based managed hosting; self-hosted needs Mailgun for bulk newsletters | Trial / OSS | Official pricing shows Starter includes website, email newsletter and 1,000 members with unlimited email sends; Ghost(Pro) handles newsletter delivery automatically | Email newsletters, posts, memberships and paid subscriptions | Members, free/paid segments, multiple newsletters by plan and membership tiers | Post-to-email publishing, segmentation, paid member targeting and offer/free-trial mechanics | Ghost editor, custom templates, publication site and built-in newsletter templates | Content API, Admin API, integrations, Stripe and Mailgun for self-hosted newsletters | Managed deliverability on Ghost(Pro); self-hosted newsletter sending requires Mailgun API | Staff users and newsletters vary by plan; Business/Custom add higher limits and SLA | Publishers who want website, memberships and email newsletter in one product | Not a general ESP; self-hosted bulk newsletter path is tightly coupled to Mailgun |