W&B Weave alternatives
Compare W&B Weave alternatives for customer-facing agents, TypeScript feedback and prompt testing. Shortlist Lunary, Braintrust and Arize Phoenix.
$20 per user / month. Payment required to activate your workspace.
Choose Lunary for a customer-facing assistant where conversation review and JavaScript or Python feedback are part of the product workflow.
Lunary
Our pick for chat replay and feedback from the application.
Braintrust
Consider for experiments, scorers and prompt deployment.
Arize Phoenix
Consider for OpenInference tracing and self-hosted experiments.
At a glance
| Candidate | Choose it for | What to weigh |
|---|---|---|
| Lunary | Chat replay and JavaScript or Python feedback | Verify the message-to-trace links you need |
| Braintrust | Experiments, scorers and prompt deployment | Compare the complete evaluation workflow |
| Arize Phoenix | OpenInference traces and self-hosted experiments | Plan instrumentation and deployment ownership |
| W&B Weave | Agent sessions and versioned evaluation artifacts | Current TypeScript SDK lacks feedback support |
See your workflow in Lunary.
Explore conversations, traces and prompt versions with our team.
Connect feedback to the reply
Lunary documents feedback capture from JavaScript and Python, on the frontend or backend. Tie a thumbs-down and comment to the exact message, then inspect the conversation and underlying model calls.
Keep the capabilities you rely on
Braintrust offers experiments and production scoring. Phoenix combines trace inspection, prompt replay and evaluations. Weave itself supports sessions, human feedback and versioned objects; map the workflows you already use before changing tools.
Test your real feedback path
In Lunary, capture a reply and user reaction through your application. Confirm the reviewer can find the message and its execution context. If you use TypeScript, validate SDK support for every operation in your shortlist.
Questions & answers
Why choose Lunary over Weave?
Lunary is a strong candidate when your application team needs conversation review and a documented JavaScript feedback workflow.
Does Weave have user feedback?
Yes. Weave supports feedback in its UI and Python SDK. Its current feedback guide says the TypeScript SDK does not support that functionality.
Can I keep my existing evaluation criteria?
Carry the same examples, expected behavior and scoring criteria into the pilot. Check compatibility before retiring existing code.
By Lunary · Documentation reviewed Sep 19, 2026
Sources & methodology (13)
Based on vendor documentation, not an independent benchmark or hands-on rating. Features and plans can change.
Bring your next AI issue to Lunary.
Follow the conversation. Find the cause. Test the fix.
$20 per user / month. Payment required to activate your workspace.