Find the free tier that fits your stack.

Appcircle

Appcircle is a mobile CI/CD platform for building, testing, signing, distributing, and publishing iOS, Android, React Native, and Flutter apps. It supports cloud and self-hosted deployment models, wit...

emailvalidation.io is an email validation and email finding service. It validates single addresses or uploaded lists in realtime, and it also exposes a REST API for form validation and bulk processing.

CORS Tester

CORS Tester is a web-based tool for checking Cross-Origin Resource Sharing behavior against an API endpoint. It accepts an API URL, origin, HTTP method, optional credentials, custom headers, and request body, then returns preflight response headers and API server response headers for review.

MantleDB is a hosted JSON key-value storage API for storing arbitrary JSON objects at deep paths over HTTP. It supports POST for overwrite writes, GET for reads, PATCH for JSON Merge Patch updates, at...

Avo

Avo is a tracking plan and event data governance platform for defining, reviewing, implementing, and monitoring product analytics schemas. It extracts event and property structures from live tracking,...

JSON Swiss

JSON Swiss is a browser-based JSON toolkit that combines formatting, validation, repair, visual table editing, conversion, schema generation, comparison, and code generation in one workflow. The forma...

xz/fonts is a free and open source CDN for delivering open source font families to websites using CSS. It serves font files through bunny.net's global content delivery network and only includes open source fonts.

Ipstack

Ipstack is a real-time IP geolocation API that returns location, ISP, timezone, currency, connection, and security data for an IP address. The service supports JSON and XML responses and includes documentation, SDKs, Postman support, and status monitoring for integration and testing.

UI-licious

UI-licious is a browser-based test authoring and execution tool for writing end-to-end UI tests in a simple script format. The page shows a login test for GitHub using commands such as goTo, fill, click, and see, along with a workspace that runs the test and reports step-by-step results.