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MLflow vs PromptLayer: catalog facts
MLflow	PromptLayer
Free Free and open source.	Freemium Free plan available with paid tiers for teams.
Web, Self-hosted, Command line	Web
Tracing built on OpenTelemetry, independent of LLM provider 50+ built-in evaluation metrics and LLM judges	Visual prompt editing without code redeploys Evaluations with datasets, graders and human review
Broad feature set takes time to learn Running it for a team means hosting and maintaining a server yourself	Hosted service; prompts and logs live on its servers Requires an account
Downloadable app, Self-hosted	Web application, Hosted service
Open source	Closed source
License: Apache-2.0	License not stated
No account needed	Account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 26, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.