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.
| Application name | Description | License | Source | Notes |
|---|---|---|---|---|
| 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. |
| Session | Encrypted, decentralized, privacy-focused messaging & calling without any meta-data collected | 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 GPLv2+ |
git | |
| The White House | The official White House app | MIT | git | |
| wikiHow | wikiHow app | GPL | 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. |