Checkly alternatives
The highest-scoring alternative to Checkly is Scalar at 83/100 on the AgentReady, against 85/100 for Checkly.
All scored in API Testing & Monitoring.
What Scalar does that Checkly does not
Scalar passes llms-full.txt / full agent docs, mcp discoverable, official python sdk, mcp integration available, and Checkly 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
Checkly fails llms-full.txt / full agent docs, mcp discoverable, no mandatory sales call, official python sdk, mcp integration available, idempotency support. Each one is a place an unattended run stops, which is usually what sends someone looking in the first place.
Where Checkly loses the points
| Pillar | Checkly | What it measures |
|---|---|---|
| Discover | 80 | Can an agent find it at all: sitemap, robots, structured data. |
| Understand | 100 | Is there a spec, an llms.txt, a machine-readable description. |
| Adopt | 65 | Signup, keys, SDKs, and whether a human has to be involved. |
| Operate | 94 | Rate-limit headers, errors, status, and behaviour under load. |
Checkly is weakest on adopt at 65/100. A sales call in the signup path stops an unattended run dead. If that is the part your agent depends on, take the ranking above seriously; if it is not, Checkly may still be the right pick.
What an agent runs into with Checkly
These are the findings from the last audit on 2026-08-22. Each one is a place unattended software stops, which is the practical reason to look at the list above.
- Ship an MCP server so agents can call you as a tool.
- Publish MCP install instructions so agents can discover the server.
- Ship an official Python SDK on PyPI.
- Publish an AGENTS.md or llms-full.txt with full agent context.
- Support an Idempotency-Key so retries are safe.
What this category actually supports
Across the 9 products scored in API Testing & Monitoring, monitor an api is offered by 89%, test an api is offered by 67%.
An agent can get this list directly: resolve("alternative to Checkly") over the MCP server, or GET /v1/categories/api-testing.