> ## Documentation Index > Fetch the complete documentation index at: https://docs.alterhq.com/llms.txt > Use this file to discover all available pages before exploring further. # URL Callbacks > Integrate Alter with other apps using x-callback-url schemes Use this guide to integrate Alter with other apps using URL schemes. ## Video Tutorial * [https://www.youtube.com/watch?v=X-XJiveQ-Wc](https://www.youtube.com/watch?v=X-XJiveQ-Wc) ## Introduction Alter supports x-callback-url so apps can trigger actions in each other. You can: * trigger Alter actions from external apps * trigger external app actions from Alter * pass input data in URLs * return back to the originating app (depending on app support) ## How It Works 1. Trigger Alter actions from another app via `alter://...` URLs. 2. Trigger external app actions from Alter using that app's URL scheme. ## Trigger Alter Actions From External Apps 1. Open Action Editor. 2. Select an action. 3. In `General`, copy the URL from the **URL Callback** section. 4. Paste the URL into another app (browser, notes, shortcuts, etc.). Alter Callback URLs ## Trigger External App Actions From Alter 1. Create a clickable URL in Alter using the target app scheme. 2. Format parameters exactly as required by that app. 3. Click to run and verify action behavior. ## Examples ### Alter callback examples * Search query: * `alter://action/ask-web?input=What+is+Alter+MacOS` * Open in Alter * Business strategist without input: * `alter://action/business-strategist-gpt` * Open in Alter * Business strategist with input: * `alter://action/business-strategist-gpt?input=Explain+Red+Ocean+Strategy` * Open in Alter ### Cross-app example * Bear note creation: * `bear://x-callback-url/create?title=Demo%20Note` ## Supported Apps (Sampling) Apps with x-callback-url or URL-scheme support include: * [1Writer](http://1writerapp.com/developers) * [2Do](http://2doapp.com/kb/article/url-scheme-supported-by-2do-for-apps-like-launch-center-pro.html) * [Agenda](https://agenda.community/t/x-callback-url-support-and-reference/27253) * [Appigo Todo](http://support.appigo.com/support/solutions/articles/179661-third-party-integration-with-todo-ios-apps) * [Bear](https://bear.app/faq/X-callback-url%20Scheme%20documentation/) * [Begin](http://blog.beginapp.co/blog/2013/9/15/url-schemes) * [breadwallet](http://breadwallet.com) * [Byword](http://bywordapp.com/support/url-scheme.html) * [Cal2Todo](http://yaas4home.blog.fc2.com/blog-entry-344.html) * [ClouDrop](http://shabz.co/m/dev.html) * [Command-C](http://danilo.to/command-c/faq/how-to-use-x-callback-url) * [Daedalus Touch](http://daedalusapp.com/url-scheme/) * [Daymate](http://www.nodheadsoftware.com/daymate/x-callback-url/) * [Definition](http://handleopenurl.com/scheme/definition) * [DEVONThink](https://www.devontechnologies.com/redirect/apps/devonthink) * [Dispatch](http://www.dispatchapp.net) * [Drafts](http://getdrafts.com) * [Due](http://www.dueapp.com/developer.html) * [Editorial](http://omz-software.com/editorial/docs/ios/editorial_urlscheme.html) * [Equipd Bible](http://www.equipd.me/kb/url-scheme/) * [Fantastical](http://flexibits.com/fantastical-iphone/faq) * [Gladys](http://www.bru.build/gladys-callback-scheme) * [Google Chrome](https://developers.google.com/chrome/mobile/docs/ios-links) * [Google Maps](http://philgr.com/blog/google-maps-and-x-callback-url-support) * [Hook](https://hookproductivity.com/) * [iCab Mobile](http://www.icab.de/blog/2012/07/01/icab-mobile-6-0-supports-x-callback-url/) * [Instapaper](http://blog.instapaper.com/post/4637427075) * [iPGMail](http://ipgmail.com/info/developers/) * [iZettle](http://developer.izettle.com/) * [Kippster for Kippt](http://kippster.net/url-schemes/) * [Launch Center Pro](http://appcubby.com/launch-center/) * [miCal](http://micalapp.com/en/faqs#category_10) * [Missives](http://blackfoggames.com/Missives/callback.html) * [Multitimer](http://persapps.com/app/multitimer/url-scheme.php) * [MyDoorOpener](http://forums.mydooropener.com/viewtopic.php?f=16\&t=295) * [Notesy](http://notesy-app.com/weblog/files/b7e15801e5b4448495eaaccfdb374cc7-20.html) * [OmniFocus](https://discourse.omnigroup.com/t/automation-in-omnifocus-2-14-released-2016-04-26/23985/92) * [Opener](http://www.opener.link/api) * [Otto's Remote](http://andymolloy.net/blog/2013/08/21/otto-and-x-callback-url/) * [Overcast](https://overcast.fm) * [Pleco](http://www.pleco.com/ipmanual/vershist.html) * [Poster](http://www.tomwitkin.com/poster/developers/) * [Prizmo](https://github.com/creaceed/PrizmoAPI) * [Procraster](http://procrasterapp.com/userguide/51) * [RollPG](http://blackfoggames.com/RollPG/callback.html) * [RunJavascript](https://itunes.apple.com/us/app/runjavascript/id1254402852) * [Scanner Go](http://ilevelupapps.com/scanner-go) * [Shopi](http://sapient-pair.com/shopi/automation.html) * [Showrtpath Browser](http://showrtpath.hatenablog.com/entry/2014/01/04/085804) * [Silo](https://siloapp.net/developer) * [Shortcuts](https://support.apple.com/guide/shortcuts/welcome/ios) * [Story Planner](http://literautas.com/en/apps/story-planner/x-callback-url/) * [Streets](http://www.futuretap.com/blog/streets-api/) * [Terminology](http://agiletortoise.com/developers/terminology) * [TextCenter](http://textcenterapp.com/xcallback.html) * [TextExpander Touch](http://smile.clarify-it.com/d/ehf7a4) * [Textastic](http://www.textasticapp.com/v4/manual/x-callback-url.html) * [Textkraft](http://www.infovole.de/en/support-en/x-callback-url-in-textkraft/) * [TextTool](http://blackfoggames.com/TextTool/callback.html) * [Things](https://culturedcode.com/things/help/url-scheme/) * [Timepage](http://moleskine.helpscoutdocs.com/article/92-timepage-url-scheme) * [Trello](https://trello.com/c/cJfzOdDm/188-automate-with-url-scheme) * [Tumblr for iOS](https://github.com/tumblr/TMTumblrSDK#url-schemes) * [Ulysses](http://ulyssesapp.com/kb/x-callback-url/) * [UpwardNotes](http://www.upwordnotes.com/url-scheme/) * [VideoLAN](https://wiki.videolan.org/Documentation:IOS/#x-callback-url) * [Waterminder](https://funnmedia.zendesk.com/hc/en-us/articles/360007745191-WaterMinder-X-Callback-URL-Support) * [Where To?](http://www.futuretap.com/api/whereto/) * [Working Copy](http://workingcopyapp.com/x-callback-url.html) ## Testing And Troubleshooting * Verify the URL scheme and parameters. * URL-encode special characters. * Confirm the target app supports the action. * Paste the app's callback documentation URL into Alter to ground syntax/rules. ## Related Docs * [Alter Actions - Workflows](/getting-started/core-features#alter-actions-workflows) * [Tools Not Working](/common-issues/tool-not-working)