# Alternatives to Comet Opik

Opik is an open-source LLM evaluation platform from Comet for tracing, evaluating, and monitoring LLM applications, with datasets, LLM-as-judge metrics, and a prompt playground.

Comet Opik ranks #1 of 8 in AI evaluation platforms, with an Alt Score of 100. It is licensed under Apache-2.0, open source with paid hosting from $19/month (USD) and available on the web. 13 of 13 checklist rows are verified against a public source.

Source: https://altcatalog.com/alternatives/comet-opik/
Category: AI evaluation platforms

## Where Comet Opik stands out

- **Open source** — 3 of 8 apps with a verified answer have this

## Overview

- **Who it's for**: AI engineering teams building LLM applications and agents who need observability, evaluation, and production monitoring — from individual developers using the free open-source or free cloud tier to enterprises wanting flexible, compliant self-hosted deployments. It works with any LLM stack via Python, TypeScript, and Ruby SDKs plus 40+ framework and model-provider integrations.
- **What you get**: A unified LLM engineering platform covering tracing and observability (full execution trees, multi-turn threads, cost/token tracking), a prompt playground and versioned Prompt Library, dataset management, automated evaluation (LLM-as-a-judge and heuristic metrics, experiments for A/B testing and regression, a Pytest integration for CI/CD), human annotation queues for subject matter experts, and production monitoring dashboards with online evaluation rules. The full featureset is available in the open-source, self-hostable version.
- **How it works**: Developers instrument their app with the Opik Python or TypeScript SDK (or an OpenTelemetry-based integration) to send traces to either Comet's hosted Opik Cloud or a self-hosted instance run via Docker Compose (`./opik.sh`) or a Kubernetes Helm chart. From there, teams build test suites from real production failures, run evaluations and experiments against datasets, route outputs to annotation queues for human review, and track cost, latency, and feedback scores through dashboards and online evaluation rules.

## Profile

- **License**: Apache-2.0 (verified 2026-07-17)
- **Pricing model**: OSS + paid hosting (verified 2026-07-17)
- **Starts at**: $19/month (USD) (verified 2026-07-17)
- **Platforms**: Web
- **Status**: active (verified 2026-07-17)

## Ranked alternatives

| # | App | Alt Score | Licence | Platforms |
|---|-----|-----------|---------|-----------|
| 1 | [Langfuse](https://altcatalog.com/alternatives/langfuse.md) | 100 | MIT | Web |
| 2 | [Arize Phoenix](https://altcatalog.com/alternatives/arize-phoenix.md) | 96 | Elastic License 2.0 (ELv2) | Web |
| 3 | [Braintrust](https://altcatalog.com/alternatives/braintrust.md) | 96 | Proprietary (platform); MIT (autoevals library) | Web |
| 4 | [HoneyHive](https://altcatalog.com/alternatives/honeyhive.md) | 93 | Proprietary | Web |
| 5 | [LangSmith](https://altcatalog.com/alternatives/langsmith.md) | 93 | Proprietary (platform); MIT (client SDK) | Web |
| 6 | [W&B Weave](https://altcatalog.com/alternatives/wandb-weave.md) | 93 | Apache-2.0 | Web |
| 7 | [Helicone](https://altcatalog.com/alternatives/helicone.md) | 76 | Apache License 2.0 | Web |

Alt Score = Verified coverage (90%) + Visibility (10%). See https://altcatalog.com/how-alt-score-works/

## Feature comparison

Legend: Yes / No / Partial / ? (not verified).

| AI evaluation platforms checklist | Comet Opik | Langfuse | Arize Phoenix | Braintrust | HoneyHive | LangSmith |
|---|---|---|---|---|---|---|
| Pricing model | OSS + paid hosting | OSS + paid hosting | Free | Freemium | Freemium | Freemium |
| Starts at | $19/month (USD) | $29/month (USD) | Free | $249/month | Free | $39/seat/mo |
| License | Apache-2.0 | MIT | Elastic License 2.0 (ELv2) | Proprietary (platform); MIT (autoevals library) | Proprietary | Proprietary (platform); MIT (client SDK) |
| Platforms | Web | Web | Web | Web | Web | Web |
| Open source | Yes | Yes | Partial | Partial | No | No |
| Self-hostable | Yes | Yes | Yes | Yes | Yes | Yes |
| Tracing / observability | Yes | Yes | Yes | Yes | Yes | Yes |
| Prompt playground & versioning | Yes | Yes | Yes | Yes | Yes | Yes |
| Dataset management | Yes | Yes | Yes | Yes | Yes | Yes |
| LLM-as-judge evals | Yes | Yes | Yes | Yes | Yes | Yes |
| Human annotation / review | Yes | Yes | Yes | Yes | Yes | Yes |
| Online (production) monitoring | Yes | Yes | Yes | Yes | Yes | Yes |
| A/B experiments | Yes | Yes | Yes | Yes | Yes | Yes |
| CI / regression testing | Yes | Yes | Yes | Yes | Yes | Yes |
| Cost & token tracking | Yes | Yes | Yes | Yes | Yes | Yes |
| Framework-agnostic SDK | Yes | Yes | Yes | Yes | Yes | Yes |
| Free tier | Yes | Yes | Yes | Yes | Yes | Yes |

## Sources

Sources for Comet Opik. Each alternative is sourced on its own page.

- **License**: Apache-2.0 — <https://raw.githubusercontent.com/comet-ml/opik/main/LICENSE> (verified 2026-07-17)
  - Note: Copyright header reads 'Copyright (c) Comet ML, Inc'; full LICENSE text is the standard Apache License 2.0.
  - Quote: “Apache License
                           Version 2.0, January 2004”
- **Pricing model**: OSS + paid hosting — <https://www.comet.com/site/pricing/> (verified 2026-07-17)
  - Quote: “You can download and self-host the open-source version, or let us handle the infrastructure with the free cloud version.”
- **Starts at**: $19/month (USD) — <https://www.comet.com/site/pricing/> (verified 2026-07-17)
  - Note: Cheapest paid Opik Cloud tier (Pro Cloud). The Open Source (self-host) and Free Cloud tiers are $0.
  - Quote: “Pro Cloud Popular Expanded usage for teams $19 Per month Start Free Trial”
- **Status**: active — <https://api.github.com/repos/comet-ml/opik> (verified 2026-07-17)
  - Note: pushed_at": "2026-07-17T06:10:14Z"" — GitHub repo shows a push on the same day as this research (2026-07-17), 20,643 stars, and is not archived.
- **Platforms**: Web — <https://www.comet.com/docs/opik/self-host/local_deployment> (verified 2026-07-17)
  - Note: Accessed via web app (Comet cloud or self-hosted); Python/TypeScript/Ruby SDKs are not part of the platforms enum.
  - Quote: “Opik will now be available at http://localhost:5173”
- **Open source**: Yes — <https://raw.githubusercontent.com/comet-ml/opik/main/README.md> (verified 2026-07-17)
  - Quote: “Opik (built by Comet) is an open-source platform designed to streamline the entire lifecycle of LLM applications.”
- **Self-hostable**: Yes — <https://raw.githubusercontent.com/comet-ml/opik/main/README.md> (verified 2026-07-17)
  - Quote: “Deploy Opik in your own environment. Choose between Docker for local setups or Kubernetes for scalability.”
- **Tracing / observability**: Yes — <https://www.comet.com/docs/opik/tracing/overview> (verified 2026-07-17)
  - Quote: “Opik gives you full visibility into every request your agent handles. Every LLM call, every tool invocation, every retrieval step is captured as a trace you can inspect, search, and analyze.”
- **Prompt playground & versioning**: Yes — <https://www.comet.com/docs/opik/development/prompt-playground> (verified 2026-07-17)
  - Note: Versioning confirmed separately: 'Every change to a prompt in the Prompt Library creates a new immutable version, numbered sequentially as v1, v2, v3' (https://www.comet.com/docs/opik/development/prom
  - Quote: “The Playground lets you test prompt changes and compare models without writing code. Create multiple prompt variants, run them side by side, and validate the results against a test suite”
- **Dataset management**: Yes — <https://www.comet.com/docs/opik/evaluation/advanced/manage_datasets> (verified 2026-07-17)
  - Quote: “Datasets can be used to track test cases you would like to evaluate your LLM on. Each dataset is made up of a dictionary with any key value pairs.”
- **LLM-as-judge evals**: Yes — <https://www.comet.com/docs/opik/evaluation/metrics/overview> (verified 2026-07-17)
  - Quote: “LLM as a Judge metrics – delegate scoring to an LLM so you can capture semantic, task-specific, or conversation-level quality signals.”
- **Human annotation / review**: Yes — <https://www.comet.com/docs/opik/evaluation/advanced/annotation_queues> (verified 2026-07-17)
  - Quote: “Annotation Queues in Opik make it simple for subject matter experts (SMEs) to review and annotate agent outputs.”
- **Online (production) monitoring**: Yes — <https://www.comet.com/docs/opik/tracing/dashboards/production_monitoring> (verified 2026-07-17)
  - Quote: “Opik has been designed from the ground up to support high volumes of traces making it the ideal tool for monitoring your production LLM applications.”
- **A/B experiments**: Yes — <https://www.comet.com/site/pricing/> (verified 2026-07-17)
  - Quote: “Use Experiments for benchmarking, A/B testing, and regression testing.”
- **CI / regression testing**: Yes — <https://www.comet.com/docs/opik/v1/testing/pytest_integration> (verified 2026-07-17)
  - Quote: “Opik provides a Pytest integration so that you can easily track the overall pass / fail rates of your tests as well as the individual pass / fail rates of each test.”
- **Cost & token tracking**: Yes — <https://www.comet.com/docs/opik/tracing/advanced/cost_tracking> (verified 2026-07-17)
  - Quote: “Opik has been designed to track and monitor costs for your LLM applications by measuring token usage across all traces.”
- **Framework-agnostic SDK**: Yes — <https://raw.githubusercontent.com/comet-ml/opik/main/README.md> (verified 2026-07-17)
  - Note: Integrations overview page also lists native SDKs/integrations for Java, .NET, and 40+ frameworks and model providers.
  - Quote: “This includes SDKs for Python, TypeScript, and Ruby (via OpenTelemetry), allowing for seamless integration into your workflows.”
- **Free tier**: Yes — <https://www.comet.com/site/pricing/> (verified 2026-07-17)
  - Note: Open Source self-host tier is also $0 with the full feature set: 'True OSS: same codebase as the hosted versions'.
  - Quote: “Free Cloud Perfect for individuals $0 Free plan Get Started Up to 10 team members 25k spans per month 60-day data retention”

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Ranked by verified data, never by who paid. https://altcatalog.com/trust/