This is an incomplete list of notable applications (apps) that run on iOS where source code is available under a free software/open-source software license. Note however that much of this software is dual-licensed for non-free distribution via the iOS app store; for example, GPL licenses are not compatible with the app store.
|Brave browser||Mobile web browser||MPL 2.0||git||Also available for Android, Windows, macOS and Linux.|
|Bitwarden||Password manager||GPLv3||git||Also available for Windows, Linux, macOS and Android.|
|ChatSecure||Encrypted XMPP client||GPLv3||git|
|Collabora Online||Office suite compatible with Microsoft Office, enterprise ready LibreOffice||MPLv2.0||git||Also available for Android, ChromeOS, iPadOS, Windows, macOS and Linux.|
|DuckDuckGo||DuckDuckGo search engine client||Apache 2.0||git||Also available for Firefox, Chrome, Safari and Android.|
|Element||Matrix collaboration client for iOS||Apache 2.0||git||Also available for Android, Web and Linux.|
|Firefox Focus||Mobile web browser||MPL 2.0||git||Also available for Android.|
|Firefox for iOS||Mobile web browser||MPL 2.0||git|
|Infomaniak Drive||File sync and share - The secure cloud||GPLv3||git||Also available for Windows, Linux, macOS and Android.|
|Jami||Softphone and instant messenger||GPLv3||git||Also available for Windows, Linux, macOS and Android.|
|Joplin||Note taking and to-do application with synchronization capabilities||MIT||git||Also available for Android, Windows, macOS and Linux.|
|Kickstarter||App for the website kickstarter.com||Apache 2.0||git||Also available for Android.|
|Linphone||Video SIP/VoIP client||GPLv2||git||Also available for Android.|
|MAPS.ME||Offline maps and navigation using OpenStreetMap data||Apache 2.0||git||Also available for Android.|
|MuPDF||PDF reader||AGPL v3+||git||Also available for Android and Windows and unix-like systems.|
|NetNewsWire||RSS reader||MIT||git||Also available for macOS.|
|Nextcloud||File sync and share, with encryption possible||GPLv3||git||Also available for Android, Windows, macOS and Linux.|
|Nextcloud Talk||Chat, voice and video calling||GPLv3||git||Also available for Android.|
|OnlyOffice||Open-source office suite compatible with Microsoft Office||AGPL v.3||git||Also available for Android, Windows, macOS and Linux.|
|Open Food Facts||Open-source and open-data food scanner||Apache 2.0||git||Also available for Android.|
|Onion Browser||An open-source, privacy-enhancing web browser for iOS, utilizing the Tor anonymity network||own||git|
|Organic Maps||Offline maps and navigation using OpenStreetMap data||Apache 2.0||git||Also available for Android and on F-Droid and AppGallery.|
|OsmAnd||Offline maps and navigation using OpenStreetMap data||MIT||git||Also available for Android.|
|OwnCloud||File sync and share (the official ownCloud app)||GPLv3||git||Also available for Android, Windows, macOS and Linux.|
|ProtonMail||E-Mail client ProtonMail||GPLv3||git||Also available for Android.|
|Signal||Encrypted instant messaging, voice and video calling||GPLv3||git||Also available for Android, Windows, MacOS and Linux.|
|Simplenote||Encrypted notes||GPLv2||git||Also available for Android, Windows, MacOS and Linux.|
|Surespot||Encrypted instant messaging||GPLv3||git||Also available for Android.|
|Telegram||Instant messaging||GPLv2||git||Also available for Android, Windows Phone, and Firefox OS.|
|Tutanota||Email client||GPLv3||git||Also available for Android, Windows, MacOS and Linux.|
|Vim||A port of the UNIX based text editor to iOS, with syntax highlighting||Free software||git|
|VLC for iOS||A port of the free VLC media player||MPL 2.0|
|The White House||The official White House app||MIT||git|
|Wikipedia||The official Wikipedia app||MIT||git||Also available for Android, webOS and Kindle.|
|Wire||Encrypted instant messaging, voice and video calling||GPLv3||git||Also available for Android, Windows, MacOS and Linux.|
|WordPress||The official WordPress app||GPLv2||git||Also available for Android.|
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