Langfuse vs Tessl

Langfuse

Langfuse is a strong default for teams that want tracing, prompt versioning and evaluations in one open-source tool, with the option to keep data on their own infrastructure. Teams that only want a hosted logging proxy with no SDK work, or that need guaranteed enterprise SSO without paying for add-ons, may find simpler or more bundled options.

Pros

• +MIT-licensed core that can be self-hosted without usage limits
• +Covers tracing, prompt management, evaluation and dashboards in one product
• +Generous free cloud tier and unlimited users from the $29 Core plan
• +OpenTelemetry support and SDKs for Python and JavaScript

Cons

• −Usage above the included 100k units is billed extra, so busy apps pay more than the headline price
• −Free tier keeps only 30 days of data and two users
• −Enterprise SSO and RBAC require the $300 Teams add-on on Pro or the Enterprise plan

Tessl

Once a team standardises on coding agents, skills sprawl and nobody knows which ones help or whether any of them are safe. Tessl is the control layer for that: a scanned, versioned registry with evaluation attached, and the distinction between published skills and skills agents actually activate is a genuinely useful metric. The risk is that it governs a convention the ecosystem is still inventing.

Pros

• +Security scanning on skills before they reach an agent, which a plain public registry does not do
• +Evaluation tells you whether a skill actually helped instead of assuming it did
• +Separates skills that are published from skills agents genuinely activate
• +Free tier includes 1,000 credits a month and needs no card

Cons

• −Credits are the billing unit and the credit-to-work conversion is not published
• −Only useful if your team has already standardised on agents like Claude Code, Cursor or Copilot
• −$100 a month is a large step from free for a fivefold credit increase
• −No founding year, headcount or funding total is published on the site

Is Langfuse cheaper than Tessl?

On published entry prices, Langfuse starts lower — $29/mo against $100/mo for Tessl. Entry price is the lowest paid plan as we last verified it; what each plan includes differs.

Does Langfuse or Tessl have a free tier?

Both: Langfuse has a free tier, and Tessl has a free tier.

Which has a public API, Langfuse or Tessl?

Langfuse ships a public API, as of our last verification. A public API for Tessl is not confirmed by us — check its developer docs before you plan an integration.