Laminar vs W&B Weave
Laminar
laminar.sh
W&B Weave
site.wandb.aiSide by side
| Figure | Laminar | W&B Weave |
|---|---|---|
| Price from | $30/mo | $60/mo |
| Free plan | Yes | Yes |
| Free trial | — | Yes |
| Open source | — | Yes |
| Web | Yes | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| Linux | — | Yes |
| iOS | — | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 4 | 4 |
| Spec score · AI Agent Observability Tools | 8.1 (#16) | 8.6 (#8) |
| Spec score · Prompt Engineering Tools | 8.1 (#13) | 8.6 (#8) |
| Spec score · Llm Monitoring | 8.0 (#15) | 8.6 (#9) |
| Spec score · LLM Observability Tools | 8.1 (#17) | 8.6 (#9) |
| Spec score · Model Monitoring Software | 8.1 (#17) | 8.6 (#10) |
| Company | Y Combinator lists Laminar as founded in 2024 and located in London, United Kingdom. | Weights & Biases says it was founded in 2017 by Lukas Biewald, Chris Van Pelt, and Shawn Lewis and was acquired by CoreWeave in May 2025. |
| Evaluations | Users can run evaluations against datasets locally or in CI to catch regressions. | An imperative evaluation API compares application or model changes with visualizations intended to expose regressions. |
| Integrations | Documented integrations include OpenAI, Anthropic, Gemini, Cohere, LiteLLM, Vercel AI SDK, LangChain, Pydantic AI, Claude Code, Codex, Browser Use, Stagehand, Playwright, and others. | The deployment guide lists integrations for OpenAI, Anthropic, Cohere, Mistral, LangChain, LlamaIndex, DSPy, Google Gemini, Amazon Bedrock, Together and Groq. |
| Security | Laminar states it is HIPAA and SOC 2 Type II compliant and offers server-side PII redaction on eligible plans. | W&B describes AWS, Azure and Google Cloud hosting and says Trust Center certifications and security artifacts are available to approved customers. |
| Support | The listed support options are community support on Free, email on Starter, Slack on Pro, and dedicated support for Enterprise. | The Pro plan includes priority email and chat support, while Enterprise includes an enterprise support package. |
| Tracing | It traces LLM calls, tool use, custom functions, and sub-agents, and presents traces as readable transcripts. | Weave organizes traces into sessions and turns and represents steps, tools, and sub-agents as first-class concepts. |
Plans
In their own words
Laminar
Laminar is an open-source, OpenTelemetry-native observability and debugging platform for AI agents. It traces LLM calls, tools, custom functions, and sub-agents as readable transcripts. Signals turn plain-language outcomes or failures into structured events across traces. Its debugger replays runs from cache to a selected point, while evaluations run against datasets locally or in CI to catch regressions. Laminar provides realtime traces, full-text search, raw SQL through its UI, CLI, or MCP, and custom dashboards. Integrations include OpenAI, Anthropic, Gemini, Cohere, LangChain, Pydantic AI, Claude Code, and Playwright. Deployment is available through managed cloud or self-hosting, including AWS or GCP with Helm charts. The Free plan is free with 1 GB data and seven-day retention. Starter costs $30 a month; Pro costs $150 a month.
W&B Weave
W&B Weave provides observability and continuous-improvement tools for production AI agents. It structures traces as sessions and turns, with steps, tools, and sub-agents represented individually. Built-in and custom signals classify interactions, and alerts can be sent through Slack notifications or webhook automations. Its evaluation tools compare results and visualize regressions before deployment; the Playground lets teams compare models and prompting methods against production traces. Safety scorers cover toxicity, bias, personal information, and hallucinations, while quality scorers assess coherence, fluency, and context relevance. Weave works with LangChain and LlamaIndex and supports models from OpenAI, Meta, Amazon Bedrock, and Anthropic. Python and TypeScript libraries are available, as is OpenTelemetry trace submission through an OTLP endpoint. Weave runs on API, Linux, macOS, self-hosted, web, and Windows platforms. The Free plan costs nothing and includes 1 GB of monthly ingestion and 5 GB of storage. Pro costs $60 a month, with 1.5 GB of monthly ingestion; extra ingestion costs $0.10 per MB. A 30-day trial is listed.