Eval Observability
Tool | Category | Segment | Platform / Tool | Plan / License | Monthly Price USD | Pricing Model | Free Tier / OSS | Included Usage / Limits | Evaluation Capabilities | Observability / Tracing | Prompt / Dataset / Experiment Features | Integrations / Frameworks | Deployment / Hosting | Security / Privacy | Team / Governance | Best Fit | Main Limits / Caveats |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
No tagline | Eval Observability | LLM observability and eval platform | LangSmith | Developer | $0/seat/mo then pay-as-you-go | Per-seat plus trace/Fleet usage | ✓ | 1 free seat; up to 5k base traces/month included; 50 Fleet runs/month; community support | Online/offline evals, annotation queues, prompt improvement and monitoring | Tracing for agent execution, run trees, monitoring and alerting | Prompt Hub, Playground, Canvas, datasets and human feedback workflows | LangChain, LangGraph and custom SDK/API integrations | LangSmith Cloud; self/hybrid hosting on Enterprise | Data retention and support are limited on Developer; enterprise has custom hosting/security | 1 seat only; community support | Solo developers debugging/evaluating LangChain or LangGraph apps | 5k traces/month and one-seat limit make it a prototype tier |
No tagline | Eval Observability | LLM observability and eval platform | LangSmith | Plus / Enterprise | $39/seat/mo Plus; Enterprise custom | Per-seat plus pay-as-you-go trace/Fleet usage | Developer free plan exists | Plus includes 10k base traces/month, one dev-sized agent deployment, 500 Fleet runs/month, unlimited seats and up to 3 workspaces; Enterprise custom | Full online/offline evals, annotation workflows, prompt improvement and monitoring | Production tracing, monitoring/alerting and agent deployment visibility | Prompt Hub, Playground, datasets, annotation queues and Fleet workflows | LangChain, LangGraph, SDK/API and enterprise deployments | Cloud plus Enterprise hybrid/self-hosting options | Enterprise SSO/RBAC, support SLA and alternative hosting | Unlimited seats on Plus; Enterprise custom workspaces/seats/security | Teams operating LangChain/LangGraph apps in production | Trace overage and retention choices can drive cost; advanced hosting requires Enterprise |
No tagline | Eval Observability | Open-source LLM observability platform | Langfuse | Hobby Cloud / OSS | $0 | Freemium units or free self-hosted OSS | ✓ | Cloud Hobby includes 50k units/month, 30 days data access, 2 users and all platform features with limits; self-hosted full product is open source | Online/offline evaluation, datasets, experiments, scores, LLM-as-judge evaluators and human annotation | LLM/agent tracing, sessions, token/cost tracking, OpenTelemetry and proxy logging | Prompt versioning/fetching/release management, playground and prompt experiments | Python/JS SDKs, OpenTelemetry Java/Go/custom, LiteLLM proxy and framework integrations | Langfuse Cloud or self-hosted Docker/Kubernetes/cloud deployment | Data regions US/EU/JP; Hobby has limited users/support and 30-day data access | 2 users on Hobby; GitHub community support | Indie projects and teams wanting open-source LangSmith alternative | Unit-based pricing counts observations/scores too, not only top-level traces |
No tagline | Eval Observability | Open-source LLM observability platform | Langfuse | Core / Pro / Enterprise | $29/mo Core; $199/mo Pro; $2,499/mo Enterprise | Monthly subscription plus unit overage | Hobby free plan exists | Core/Pro include 100k units/month and $8/100k additional; Core has 90 days data access; Pro has 3 years; Enterprise includes Pro+Teams and enterprise controls | Evaluation datasets, experiments, scores, LLM-as-judge, human annotation queues and external evaluation pipelines | High-volume tracing, token/cost tracking, multimodal beta, proxy/OpenTelemetry logging | Prompt management, prompt experiments, release labels, playground and webhooks/Slack | SDKs, OpenTelemetry, LiteLLM, framework integrations and public API | Cloud or self-host; Enterprise custom volume/marketplace/invoice options | Pro has SOC2/ISO27001 reports and BAA available; Enterprise adds audit logs, SCIM, SLA and dedicated support | Unlimited users from Core; Teams add-on adds SSO/RBAC/support on Pro | Teams needing open-source-friendly observability with predictable cloud tiers | Core/Pro both start with 100k units; Teams add-on and overages can materially change price |
No tagline | Eval Observability | AI eval and observability platform | Braintrust | Starter | $0 platform fee | Usage-based free tier plus overage | ✓ | 1 GB processed data/month then $4/GB; 10k scores/month then $2.50/1k; 14 days retention; $10/month Topics credit | Experiments, scorers, online scoring, eval datasets, human review scorers and sandbox evals by plan | Production logs, tracing, dashboards, topics and monitoring | Prompt playgrounds, datasets, experiments, exports and environment workflows | SDK/API, custom functions, AI provider gateway and app integrations | Braintrust Cloud; self-hosted customers can adjust some system limits | Starter has Google-only SSO, owner-only permission group and no SOC2/DPA/BAA | Unlimited users/projects/datasets in current Starter model, but limited advanced governance | Small teams starting evals without per-seat fees | Processed-data and score overages can appear once usage exceeds free allocation |
No tagline | Eval Observability | AI eval and observability platform | Braintrust | Pro / Enterprise | $249/mo Pro; Enterprise custom | Monthly platform plus usage overage | Starter free tier exists | Pro includes 5 GB processed data/month then $3/GB, 50k scores/month then $1.50/1k, 30 days retention and launch Topics credit; Enterprise custom | Advanced evals, custom charts, environments, dataset snapshots, playground annotations and sandbox evals | Production observability, topics, dashboards, logs and monitoring | Datasets, experiments, prompts, functions, environments and exports | SDK/API, gateway, provider integrations and custom functions | Cloud; enterprise/self-host options by contract | Enterprise adds SAML/OIDC SSO, custom permission groups, retention, exports, SOC2, BAA and custom legal terms | Pro has Owner/engineer/viewer permission groups; Enterprise custom | Growing production teams needing eval/observability plus gateway workflows | Retention is 30 days on Pro; custom retention/SAML/BAA require Enterprise |
No tagline | Eval Observability | Hosted observability and eval platform | Arize AX / Phoenix Cloud | AX Free / AX Pro | $0 Free; $50/mo Pro | Hosted SaaS with span/GB quotas and overages | ✓ | AX Free: 25k spans/month, 1 GB/month, 15 days retention; AX Pro: 50k spans/month, 10 GB/month, 30 days retention, higher limits and email support | Online/offline evaluations, datasets, experiments, LLM-as-judge/code evals, session/agent path evals and labeling queues | Hosted tracing, product observability, custom metrics, monitors and Alyx agent assistance | Prompt management, prompt serving, prompt environment tags, replay and optimization | SDKs, OpenTelemetry and framework integrations | Hosted SaaS; Enterprise SaaS or self-hosted | AX Free/Pro regions US/EU/CA; Enterprise adds SOC2/HIPAA, SLA, dedicated support and self-host add-on | 1 organization on AX Free/Pro; Enterprise custom | Teams wanting hosted Phoenix with simple span/GB pricing | AX Pro span/GB overage is separate; Enterprise required for advanced governance |
No tagline | Eval Observability | LLM request observability | Helicone | Hobby | $0 | Free request/storage quota | ✓ | 10,000 requests/month, 1 GB storage, 1 seat and 1 organization | Prompt/request analysis and regression-style evaluation workflows depending feature use | Request logging, usage/cost tracking, metrics, caching, alerts/reporting on paid tiers | Prompts, experiments and query language stronger on Pro+ | OpenAI-compatible proxy style, provider integrations and app SDK/API workflows | Hosted Helicone; self-host/open-source options should be checked in docs/repo | Free plan has one seat/org and limited storage | 1 seat/1 org on Hobby | Indie apps tracking LLM request costs and latency quickly | Free quota is request-limited and storage-limited; team features start paid |
No tagline | Eval Observability | LLM request observability | Helicone | Pro / Team | $79/mo Pro; $799/mo Team | Monthly plan plus usage-based pricing | Hobby free plan exists | Pro and Team include 10k free requests plus usage-based pricing; Pro has unlimited seats, alerts/reports and HQL; Team adds 5 organizations and scaling-company features | Evaluation and prompt iteration workflows through request logs, reports and query language | LLM request tracing, usage, cost, latency, alerts, reports and storage | HQL query language, prompt/request analysis and team reporting | Provider proxy/integration workflows for LLM apps | Hosted Helicone | Enterprise adds unlimited orgs and custom terms; Team/Enterprise for broader governance | Unlimited seats on Pro/Team; org count rises from 1 to 5 on Team | Teams needing request-level observability with simple fixed starting price | Usage-based charges apply after included quota; Team price jumps sharply |
No tagline | Eval Observability | AI app and model tracking platform | Weights & Biases / Weave | Free | $0/mo | Free cloud plan for personal/small projects | ✓ | Free plan includes AI application evaluations/tracing/scorers, experiment tracking, registry/lineage, CI/CD automations, Slack/email alerts, 5 GB storage and 1 GB/month Weave ingestion | AI application evaluations and scorers | Weave tracing for GenAI applications plus W&B experiment tracking | Datasets/registry/lineage and CI/CD automations | W&B SDK, Weave integrations, model tracking and app tracing workflows | Cloud-hosted Free or local personal server; corporate use rules differ for personal self-host | Free lacks enterprise security; academic research gets separate free program | Free is for personal development/small projects | Developers combining ML experiment tracking with LLM app tracing | Corporate/professional team use generally moves to Pro/Enterprise; ingestion/storage limits apply |
No tagline | Eval Observability | AI app and model tracking platform | Weights & Biases / Weave | Pro / Enterprise | Starts at $60/mo Pro; Enterprise custom | Monthly plan plus storage/Weave ingestion/inference usage | Free plan exists | Pro starts at $60/month, includes up to 10 model seats, 100 GB storage and 1.5 GB/month Weave ingestion; additional storage $0.03/GB and Weave ingestion $0.10/MB | AI app evaluations/scorers plus ML experiment and model evaluation workflows | Weave production/development tracing and W&B experiment observability | Registry, lineage, automations, datasets and team collaboration | W&B SDK, Weave, model/inference integrations | Cloud or enterprise/private-hosted deployment options | Enterprise adds SSO, SCIM, audit logs, HIPAA option, customer-managed encryption and enterprise support | Pro for teams under stated guidelines; Enterprise for compliance/security | Teams already using W&B for ML who need GenAI app tracing | Weave ingestion overage can be expensive at high trace payload volume |
No tagline | Eval Observability | Open-source GenAI observability/eval platform | Comet Opik | OSS / Free Cloud | $0 | Open source or free hosted cloud | ✓ | OSS full feature set; Free Cloud up to 10 team members, 25k spans/month and 60-day retention | Test suites, assertions, agent testing, evaluations and prompt/trace analysis | Agent tracing, execution graphs, sessions, token/cost tracking and multimedia logging | Agent Playground, prompts/configuration, datasets/experiments and comments | Python/TypeScript SDKs, public API and MCP server | Self-host OSS or Comet-hosted cloud | Free Cloud has usage limits; OSS data stays self-hosted | Free Cloud up to 10 team members | Teams wanting a very generous free LLM observability/eval stack | Cloud span quota is lower than some competitors; self-hosting requires ops |
No tagline | Eval Observability | Open-source GenAI observability/eval platform | Comet Opik | Pro Cloud / Enterprise | $19/mo Pro; Enterprise custom | Monthly cloud plan or custom enterprise | OSS and Free Cloud exist | Pro Cloud includes up to 50 team members, 100k spans/month and 60-day retention; Enterprise custom usage and unlimited team members | Test suites/assertions, agent testing, playground and evaluation workflows | Tracing, execution graphs, sessions, token/cost tracking and error surfacing | Prompt/config management, datasets, experiments, annotations and export | SDKs, public API, MCP server and Comet ecosystem | Hosted cloud, self-host OSS or enterprise flexible deployments | Enterprise SSO, dedicated support/SLA and compliance reports | Up to 50 team members on Pro; Enterprise unlimited/custom | Small teams wanting low-cost hosted eval/observability | Pro retention is still 60 days; advanced compliance/deployment requires Enterprise |
No tagline | Eval Observability | LLM security and eval CLI | Promptfoo | Community | $0 | Open-source local/self-hosted tool | ✓ | All LLM evaluation features, all model providers/integrations, red teaming up to 10k probes/month, custom app integration and vulnerability scanning | Prompt/model/RAG evaluations, red teaming, factuality, hallucination and vulnerability testing | Local reports and scans rather than hosted trace observability by default | YAML/config-driven test cases, assertions, model comparison and CI integration | All model providers, custom integrations, CI/CD, app targets and security plugins | Run locally or self-host on own infrastructure | Data stays local/self-hosted in Community; community support | Individual/small team use; no hosted team collaboration | Developers adding eval and red-team tests to CI without SaaS | 10k free red-team probes/month; team dashboards/API/cloud require Enterprise |
No tagline | Eval Observability | LLM security and eval platform | Promptfoo | Enterprise / On-Premise | Custom | Custom enterprise subscription/deployment | Community free plan exists | Custom red-team limits, team sharing, continuous monitoring, security/compliance dashboard, SSO, API access, managed cloud or on-prem deployment | Advanced LLM security testing, monitoring, red-teaming and evaluations at org scale | Continuous monitoring and centralized dashboards | Saved targets, attack profiles, API access and organization-specific configs | CI/CD, model providers, app integrations, Promptfoo API and managed/on-prem infrastructure | Managed cloud deployment or on-premise deployment with complete data isolation | SSO, granular permissions, compliance dashboard, support and SLA guarantees | Teams-based access controls and custom roles | Organizations needing formal AI security testing and red-team monitoring | Pricing is custom; advanced cloud/on-prem features unavailable in Community |
No tagline | Eval Observability | Open-source LLM unit testing | DeepEval | Open source framework | $0 software | Open-source local framework; provider API costs separate | ✓ | Runs local evals/CI; most metrics are LLM-as-judge and default to OpenAI unless configured; can use Anthropic, Gemini, Ollama, Azure OpenAI or custom LLM | LLM unit tests, RAG/agent/multi-turn/safety/MCP metrics, synthetic data and benchmarks | Local testing reports; can integrate with Confident AI for hosted observability | Pytest-like CLI, evaluate(), metrics, datasets and CI/CD workflows | Python framework with provider/model integrations and Confident AI integration | Local/open-source; optional Confident AI cloud | Basic non-identifying telemetry by default can be opted out; cloud data stored in private AWS per FAQ | OSS used by developers/CI; no team governance locally | Engineering teams adding test assertions to LLM apps | Judge model calls can cost money; dependency/runtime compatibility matters in CI |
No tagline | Eval Observability | AI quality platform | Confident AI | Free / Starter / Premium | $0 Free; from $19.99/user/mo Starter; from $49.99/user/mo Premium | Per-user plus project and GB-month/eval-run overage | ✓ | Free: 2 users, 1 project, 5 test runs/week, 1 GB-month trace spans and 1 week retention; Starter/Premium add paid users/projects, online eval metric runs and retention controls | LLM eval benchmark/testing reports, unit/regression tests, online evals and custom metrics | LLM tracing, monitoring, alerts and trace span storage by GB-month | Prompt versioning, cloud dataset annotation, no-code workflows and pre-commit evals on Premium | DeepEval, DeepTeam, OpenTelemetry, TypeScript SDK and APIs | Hosted Confident AI; Enterprise dedicated on-prem available | SOC2/HIPAA/GDPR listed; data stored in private AWS per docs | Free limited to 2 seats/1 project; paid per user/project; Team custom | Teams wanting hosted DeepEval-style eval workflows | Self-serve plan math includes user/project/GB/eval overages; Free test runs are capped |
No tagline | Eval Observability | RAG and LLM evaluation framework | Ragas | Open source | $0 software | Open-source Python framework; optional services/consulting separate | ✓ | Library for systematic evaluation loops, metrics, experiments, datasets and testset generation; no hosted quota on docs page | RAG metrics such as context precision/recall, faithfulness, response relevancy plus agent/tool, SQL and general-purpose metrics | Integrates with observability tools including Arize and LangSmith; not a full tracing SaaS by itself | Experiments, evaluation datasets, metrics, prompt evaluation and test data generation | LangChain, LlamaIndex, Haystack, LangGraph, Gemini, Bedrock, Vertex AI and other integrations | Local Python library; can plug into external observability tools | Data handling depends on your runner/model providers; open-source code visible | No built-in team governance unless integrated with another platform | Teams evaluating RAG quality with standardized metrics | LLM-as-judge/testset generation can incur model costs; no hosted collaboration tier captured |
No tagline | Eval Observability | Open-source eval registry/framework | OpenAI Evals | Open source | $0 software | Open-source framework; model/API costs separate | ✓ | Framework for evaluating LLMs and LLM systems plus open-source benchmark registry | Benchmark and custom eval workflows for LLM systems | Not a tracing/production observability platform | Eval registry, custom eval definitions and scripts | OpenAI API and Python-based eval workflows; can be adapted to other model calls | Local/open-source repo | Data sent to configured model/API providers; repo license governs source | No team governance; repo/CI handles collaboration | Developers creating repeatable model/system benchmarks | Older/evolving repo; may require adaptation for modern agent app evals |
No tagline | Eval Observability | Open-source model benchmark harness | lm-evaluation-harness | Open source | $0 software | Open-source benchmark harness | ✓ | Few-shot evaluation harness for language models with many tasks/backends; run costs depend on model backend/API | Standardized model benchmark evaluation and task suites | No production tracing; focused on offline benchmark runs | Task configs, metrics, model adapters and result reporting | Local/HF/vLLM/API-style backends depending harness support | Local/open-source | Self-managed data and model access | No SaaS governance | Researchers benchmarking base/instruct models | Best for model benchmarks, not app-level RAG/agent observability |
No tagline | Eval Observability | Open-source LLM benchmark platform | OpenCompass | Apache-2.0 / open source | $0 software | Open-source platform; API/model costs separate | ✓ | Supports many models and over 100 datasets; can evaluate open-source and API models with CLI or Python scripts | General/scientific/reasoning benchmarks, LLM judge, math evaluation and long-context benchmarks | No production app tracing; offline/leaderboard-oriented evaluation | Dataset configs, model configs, summarizers and benchmark result workflows | HuggingFace, vLLM, LMDeploy, OpenAI/API, ModelScope and other backends | Local/open-source; leaderboard/community infra separate | Self-managed API keys/data; Apache-2.0 repo | Community/open-source governance | Model evaluation teams needing broad benchmark coverage | Setup/dataset prep can be heavy; not app observability |
No tagline | Eval Observability | Open-source model evaluation framework | EvalScope | Open source | $0 software | Open-source framework; model/API costs separate | ✓ | Streamlined/customizable framework for efficient LLM, VLM and AIGC evaluation and performance benchmarking | Model and application benchmark/evaluation workflows | No hosted tracing platform by default | Benchmarks, reports and performance testing workflows | ModelScope ecosystem plus local/model backends depending configuration | Local/open-source | Self-managed data/model/API usage | No SaaS governance by default | Teams evaluating LLM/VLM/AIGC model performance | Best for benchmark/performance eval, not production trace management |
No tagline | Eval Observability | Open-source LLM eval toolkit | Hugging Face LightEval | Open source | $0 software | Open-source toolkit; model/API costs separate | ✓ | All-in-one toolkit for evaluating LLMs across multiple backends | Offline model benchmark/evaluation toolkit | No production observability/tracing | Task configuration and evaluation reporting | Hugging Face ecosystem and multiple model backends | Local/open-source | Self-managed data/model execution | No team governance unless combined with HF/CI workflows | Researchers and model builders using Hugging Face workflows | Model-centric eval rather than app/RAG/agent observability |
No tagline | Eval Observability | Open-source LLM experiment tracking/evaluation | TruLens | Open source | $0 software | Open-source framework; model/API costs separate | ✓ | Evaluation and tracking for LLM experiments and AI agents | Feedback functions, RAG/agent app evaluation and experiment comparison | Tracking/tracing within local/app workflows; hosted governance depends on external platform | Experiment records, feedback functions, leaderboards and app-level eval workflows | Python ecosystem, LlamaIndex/LangChain style app integrations | Local/open-source | Self-managed data unless connected to external services | No built-in cloud team governance in OSS row | Developers evaluating RAG/agent apps with feedback functions | Requires custom setup and model/provider calls; not a turnkey SaaS dashboard alone |
No tagline | Eval Observability | LLM response comparator | LLM Comparator | Open source | $0 software | Open-source visualization tool | ✓ | Interactive data visualization tool for evaluating and analyzing LLM responses side-by-side | Side-by-side response comparison and qualitative eval analysis | No request tracing or monitoring | Datasets/outputs visualization rather than prompt registry | Browser/data visualization workflow | Local/open-source | Self-managed datasets/output files | No SaaS governance | Teams comparing model outputs and evaluator disagreement visually | Narrower than full eval suites; needs prepared outputs |
No tagline | Eval Observability | AI coding agent observability | agenttrace | Open source | $0 software | Local-first TUI | ✓ | Local-first TUI observability for AI coding agents; tracks cost, tokens, tool failures, anomalies, health and CI gates across agent exports per local resource | Evaluation/quality gates for agent sessions and CI evidence | Cost/token/tool-failure observability for Claude Code, Codex CLI, Gemini CLI, Aider and Cursor exports | Session exports and CI gates rather than LLM prompt datasets | Claude Code, Codex CLI, Gemini CLI, Aider and Cursor exports | Local/self-hosted CLI/TUI | Local-first; data stays in workspace unless exported | Governance through local repo/CI policies | Developers monitoring AI coding agent runs and failures | Not a general LLM app observability platform; project maturity depends on repo |
No tagline | Eval Observability | PR quality evaluation | PR Triage | MIT / BYOK | $0 software | Open-source BYOK web app | ✓ | Open-source PR evaluation tool scoring pull requests on six quality dimensions with diff evidence; bring your own key per local resource | PR/code-quality evaluation and evidence-backed scoring | No runtime LLM app tracing; focused on code review evidence | Score reports over PR diffs rather than prompt/dataset management | Git/PR diff workflows and BYOK model access | Hosted demo/web app or self-host from source if available | BYOK; data exposure depends on where hosted/model provider | No enterprise governance captured | Developers wanting lightweight PR eval reports | Narrow code-review use case; not general model/app eval platform |