Free browser tools
Useful before
the upload button.
Small, focused checks for app releases. Your screenshots and API descriptions are processed in this browser tab and are not sent to this website.
01
Release preparation
Store Screenshot Validator
Check screenshot dimensions, format, transparency, count, and store-specific constraints before upload.
Validate screenshots02
API compatibility
OpenAPI Breaking Change Checker
Compare two OpenAPI or Swagger descriptions and review likely client-breaking changes.
Compare API specs