The best alternatives to APImetrics are API Tester, Perf, and Runscope. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— Speech-to-Text API with superhuman accuracy
Solve API problems fast with API performance monitoring and testing. With the Runscope suite of API tools built for teams, you can ensure that your APIs are up, fast and correct, debug partner integration issues and much more.
Trace is a lightweight GraphQL query performance monitoring GUI that provides users with real-time, resolver-level performance tracing metrics and error logging.
RakAPIt is an API Testing Cloud Service that makes API testing easier. It automates the API testing process from test case generation to test execution.
Mayhem was purpose-built to cut through the noise of traditional application security. Combining techniques used by attackers with generative AI, Mayhem tries to break your applications thousands of times every minute so you can find and fix the risks that matter most.