Treblle alternatives
The highest-scoring alternative to Treblle is Vellum at 88/100 on the AgentReady, against 55/100 for Treblle.
All scored in Agent Frameworks & Runtimes.
What Vellum does that Treblle does not
Vellum passes llms.txt published, llms-full.txt / full agent docs, openapi / spec quality, request examples provided, response examples provided, errors and status codes documented, self-service signup, no mandatory sales call, programmatic credential creation, fast time to first request, structured, predictable output, machine-readable errors, retry behavior documented, and Treblle fails them. That is the whole of the gap between the two scores, so if none of those matter to your agent the ranking above overstates the difference.
Why people look for an alternative
Treblle fails llms.txt published, llms-full.txt / full agent docs, openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented, self-service signup, no mandatory sales call, programmatic credential creation, fast time to first request, structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified. Each one is a place an unattended run stops, which is usually what sends someone looking in the first place.
What this category actually supports
Across the 18 products scored in Agent Frameworks & Runtimes, build an agent is offered by 61%, orchestrate agents is offered by 22%, agent memory is offered by 0%. Anything under half is a gap you should expect to fill yourself whichever one you pick.
An agent can get this list directly: resolve("alternative to Treblle") over the MCP server, or GET /v1/categories/agent-frameworks.