Side by side
API Contract Tester vs Karate
Both stand on contract testing tools. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan Web
API Contract Tester offers schema checks through a web tool or local CLI, with options for agent integration and deployment pipelines. The free plan is limited to 100 executions per month and excludes premium modules.
Visit API Contract Tester
Free plan Open source APIExtensionLinux+3
Karate offers a free framework spanning API, UI, mock, and performance testing, with paid plans for additional IDE and client features. The production CI/CD license condition for async protocols matters for teams evaluating Kafka, gRPC, or WebSocket testing.
Visit KarateThe facts
| API Contract Tester | Karate | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Yes |
| Runs on | Web | API, Extension, Linux, Mac, Self-hosted, Windows |
| Lowest paid plan | Individual Dev: $19 a month | IDE Plus: $100 per user a year |
| Plans published | 4 | 5 |
| Maker | Not published | Not published |
| Website | clinetools.com | karatelabs.io |
| On contract testing tools | #5 of 22 | #1 of 22 |
API Contract Tester: what it does well
- Checks missing and extra fields, types, and null violations.
- Validates nested objects, arrays, enums, and optional fields.
- Reports mismatches with fix suggestions.
- Supports local CLI use as an MCP server.
- Free plan includes 100 monthly executions.
What to know first
- CLI requires Node.js 18 or later.
- Free plan excludes premium modules.
- Individual Dev costs $19 a month.
Karate: what it does well
- Free MIT-licensed framework for commercial projects
- Supports REST, GraphQL, and SOAP testing
- Combines UI and API steps in tests
- API tests can be reused for performance testing
- Products run locally or in customer infrastructure
What to know first
- Free tier includes community support
- IDE Plus costs $100 a year
- Pro costs $640 a year
- Production CI/CD async testing requires an Enterprise runtime license
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