urx.si/tools
Free tools for app links
Small tools for app developers. No signup, nothing to install.
apple-app-site-association validator
Check the files that make Universal Links (iPhone) and App Links (Android) open your app, including Apple's CDN copy and Google's view.
Firebase Dynamic Link decoder
See what an old Firebase Dynamic Link did: its deep link, where iPhone and Android users went, and every parameter. Runs in your browser.