# Alternatives to W&B Weave

Weave is the Weights & Biases toolkit for tracking, evaluating, and monitoring LLM applications, with tracing, scorers, and experiment comparison.

W&B Weave ranks #7 of 8 in AI evaluation platforms, with an Alt Score of 93. It is licensed under Apache-2.0, freemium from $60/month and available on the web. 13 of 13 checklist rows are verified against a public source.

Source: https://altcatalog.com/alternatives/wandb-weave/
Category: AI evaluation platforms

## Overview

- **Who it's for**: Developers and teams building LLM applications and agents who need to debug non-deterministic outputs, run rigorous evaluations, and monitor production behavior — from solo developers on the free tier to enterprise teams needing HIPAA-compliant, self-managed deployments. It integrates with agent SDKs and harnesses (OpenAI Agents SDK, Google ADK, Claude Code) and LLM providers/orchestration frameworks (OpenAI, Anthropic, Bedrock, LangChain, LlamaIndex, DSPy) rather than being tied to one stack.
- **What you get**: An observability and evaluation platform: automatic tracing of agent sessions and function calls (Ops, Calls, Traces, Threads) with cost/token tracking, a no-code Playground and Evaluation Playground for testing and comparing prompts/models with LLM-as-judge scorers, versioned Datasets and Prompts, annotation queues for human review, and production monitoring via built-in Signals, custom monitors, guardrails, and automations (Slack/webhook alerts on regressions).
- **How it works**: Developers install the open-source Weave Python or TypeScript SDK (Apache-2.0, wandb/weave on GitHub), decorate functions with @weave.op or use autopatched provider integrations, and call weave.init to stream traces to a W&B project. Evaluations, scorers, and datasets are versioned Weave objects referenced by immutable ref URIs. Weave is offered as part of the hosted W&B SaaS platform (free, Pro at $60/month, or custom Enterprise) or as a self-managed instance deployed on customer infrastructure with a ClickHouse backend.

## Profile

- **License**: Apache-2.0 (verified 2026-07-17)
- **Pricing model**: Freemium (verified 2026-07-17)
- **Starts at**: $60/month (verified 2026-07-17)
- **Platforms**: Web
- **Status**: active (verified 2026-07-17)

## Ranked alternatives

| # | App | Alt Score | Licence | Platforms |
|---|-----|-----------|---------|-----------|
| 1 | [Comet Opik](https://altcatalog.com/alternatives/comet-opik.md) | 100 | Apache-2.0 | Web |
| 2 | [Langfuse](https://altcatalog.com/alternatives/langfuse.md) | 100 | MIT | Web |
| 3 | [Arize Phoenix](https://altcatalog.com/alternatives/arize-phoenix.md) | 96 | Elastic License 2.0 (ELv2) | Web |
| 4 | [Braintrust](https://altcatalog.com/alternatives/braintrust.md) | 96 | Proprietary (platform); MIT (autoevals library) | Web |
| 5 | [HoneyHive](https://altcatalog.com/alternatives/honeyhive.md) | 93 | Proprietary | Web |
| 6 | [LangSmith](https://altcatalog.com/alternatives/langsmith.md) | 93 | Proprietary (platform); MIT (client SDK) | 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 | W&B Weave | Comet Opik | Langfuse | Arize Phoenix | Braintrust | HoneyHive |
|---|---|---|---|---|---|---|
| Pricing model | Freemium | OSS + paid hosting | OSS + paid hosting | Free | Freemium | Freemium |
| Starts at | $60/month | $19/month (USD) | $29/month (USD) | Free | $249/month | Free |
| License | Apache-2.0 | Apache-2.0 | MIT | Elastic License 2.0 (ELv2) | Proprietary (platform); MIT (autoevals library) | Proprietary |
| Platforms | Web | Web | Web | Web | Web | Web |
| Open source | Partial | Yes | Yes | Partial | Partial | 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 | Partial | 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 W&B Weave. Each alternative is sourced on its own page.

- **Pricing model**: Freemium — <https://wandb.ai/site/pricing/> (verified 2026-07-17)
  - Quote: “Free Designed for personal development of AI applications and models $0/mo GET STARTED Includes AI application evaluations AI application tracing AI application scorers ... Pro Professionals working t”
- **Platforms**: Web — <https://wandb.ai/site/pricing/> (verified 2026-07-17)
  - Note: Weave is a hosted web app (wandb.ai) plus Python/TypeScript SDKs; SDKs are not part of the allowed platforms enum so only Web is recorded.
  - Quote: “Cloud-hosted Privately-hosted”
- **Status**: active — <https://docs.wandb.ai/release-notes/weave-sdk-releases> (verified 2026-07-17)
  - Note: Release notes list frequent point releases through April 2026; GitHub API shows the wandb/weave repo was pushed to on 2026-07-17 (the day of this research), confirming ongoing active development.
  - Quote: “0.52.37 April 17, 2026 Added OpenTelemetry integrations follow the latest semantic conventions.”
- **License**: Apache-2.0 — <https://raw.githubusercontent.com/wandb/weave/master/LICENSE> (verified 2026-07-17)
  - Note: Applies to the Weave SDK/client repo (wandb/weave) on GitHub, confirmed Apache-2.0 via the GitHub API license field as well. The W&B hosted platform/backend that Weave traces into is proprietary SaaS.
  - Quote: “Apache License
                           Version 2.0, January 2004”
- **Starts at**: $60/month — <https://wandb.ai/site/pricing/> (verified 2026-07-17)
  - Quote: “Pro Professionals working to optimize AI applications and models Starts at $60/month, billed monthly START YOUR 30 DAY FREE TRIAL”
- **Open source**: Partial — <https://raw.githubusercontent.com/wandb/weave/master/LICENSE> (verified 2026-07-17)
  - Note: The Weave client SDK / eval library (wandb/weave, Apache-2.0) is genuinely open source, but the hosted W&B Weave observability platform and UI you compare here are proprietary SaaS — not a self-hostab
  - Quote: “Apache License
                           Version 2.0, January 2004”
- **Self-hostable**: Yes — <https://docs.wandb.ai/weave/guides/platform/weave-self-managed> (verified 2026-07-17)
  - Quote: “Self-hosting W&B Weave gives you more control over its environment and configuration. This can help you create a more isolated environment and meet additional security compliance.”
- **Tracing / observability**: Yes — <https://docs.wandb.ai/weave/concepts/what-is-weave> (verified 2026-07-17)
  - Quote: “W&B Weave is an observability and evaluation platform for building reliable LLM applications.”
- **Prompt playground & versioning**: Yes — <https://docs.wandb.ai/weave/guides/core-types/prompts-version> (verified 2026-07-17)
  - Quote: “Weave automatically tracks every version of your prompts, creating a complete history of how your prompts evolve.”
- **Dataset management**: Yes — <https://docs.wandb.ai/weave/guides/core-types/datasets> (verified 2026-07-17)
  - Quote: “Weave datasets help you organize, collect, track, and version examples for LLM application evaluation and side-by-side comparison.”
- **LLM-as-judge evals**: Yes — <https://docs.wandb.ai/weave/guides/tools/evaluation_playground> (verified 2026-07-17)
  - Quote: “Compare and evaluate model performance using evaluation datasets and LLM scoring judges.”
- **Human annotation / review**: Yes — <https://docs.wandb.ai/weave/guides/tracking/annotation-review> (verified 2026-07-17)
  - Quote: “Annotation queues provide a focused review interface for domain experts. You review one item at a time, examine the provided context, and submit structured feedback using predefined fields.”
- **Online (production) monitoring**: Yes — <https://docs.wandb.ai/weave/guides/evaluation/monitors> (verified 2026-07-17)
  - Quote: “Automated scoring: Every incoming production trace is automatically processed and scored on common quality issues and errors.”
- **A/B experiments**: Partial — <https://docs.wandb.ai/weave/guides/tools/comparison> (verified 2026-07-17)
  - Note: Weave supports side-by-side comparison of traces/prompts/models and an Evaluation Playground for comparing model variants, but no evidence was found of randomized live-traffic A/B splitting for produc
  - Quote: “The W&B Weave Comparison feature lets you visually compare and diff code, traces, prompts, models, and model configurations. You can compare two objects side-by-side or analyze a larger set of objects”
- **CI / regression testing**: Yes — <https://docs.wandb.ai/weave/guides/evaluation/automations> (verified 2026-07-17)
  - Note: The pricing page also lists 'CI/CD automations' as a Pro-plan feature (https://wandb.ai/site/pricing/).
  - Quote: “Regression detection: Send an alert when a scorer detects a drop in accuracy or an increase in toxicity.”
- **Cost & token tracking**: Yes — <https://docs.wandb.ai/weave/guides/tracking/costs> (verified 2026-07-17)
  - Quote: “Weave tracks the cost of LLM calls in two ways: Automatic cost tracking ... Weave captures token usage from the API response and applies built-in pricing for the model, with no extra code required.”
- **Framework-agnostic SDK**: Yes — <https://docs.wandb.ai/weave/guides/integrations> (verified 2026-07-17)
  - Note: Integrations page lists LLM providers (OpenAI, Anthropic, Bedrock, Cohere, Google, Groq, Hugging Face, etc.) and orchestration frameworks (LangChain, LlamaIndex, DSPy, and others); README states weave
  - Quote: “Weave provides two ways to integrate with your AI stack ... These integrations capture individual LLM calls and pipeline steps as Weave Calls in the Traces view.”
- **Free tier**: Yes — <https://wandb.ai/site/pricing/> (verified 2026-07-17)
  - Quote: “Free Designed for personal development of AI applications and models $0/mo GET STARTED Includes AI application evaluations AI application tracing AI application scorers AI model experiment tracking”

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