List of free and open-source iOS applications
This is an incomplete list of notable applications 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 |
| Adblock Plus | An open source content blocker for Safari | GPLv3 | Also available for Android and as a browser extension. | |
| Adguard | An open source adblocker for iOS | GPLv3 | Also available for Android, Windows, macOS, and as a browser extension. | |
| Altstore | An alternative app store for non-jailbroken iOS devices. | AGPLv3 | ||
| Brave browser | Mobile web browser | MPL 2.0 | Also available for Android, Windows, macOS and Linux. | |
| Bitwarden | Password manager | GPLv3 | Also available for Windows, Linux, macOS and Android. | |
| Bluesky | Official Bluesky app | MIT | Also available for Android. | |
| ChatSecure | Encrypted XMPP client | GPLv3 | ||
| Collabora Online | Office suite compatible with Microsoft Office, enterprise ready LibreOffice | MPLv2.0 | Also available for Android, ChromeOS, iPadOS, Windows, macOS and Linux. | |
| DuckDuckGo | DuckDuckGo search engine client | Apache 2.0 | Also available for Firefox, Chrome, Safari and Android. | |
| Element | Matrix collaboration client for iOS | Apache 2.0 | Also available for Android, Web and Linux. | |
| Firefox Focus | Mobile web browser | MPL 2.0 | Also available for Android. | |
| Firefox for iOS | Mobile web browser | MPL 2.0 | ||
| iNaturalist | The official iNaturalist app | MIT | Also available for Android. | |
| Infomaniak Drive | File sync and share - The secure cloud | GPLv3 | Also available for Windows, Linux, macOS and Android. | |
| IVPN | Official IVPN iOS app | GPLv3 | Also available for Android, Windows, macOS, and Linux. | |
| Jami | Softphone and instant messenger | GPLv3 | Also available for Windows, Linux, macOS and Android. | |
| Joplin | Note taking and to-do application with synchronization capabilities | MIT | Also available for Android, Windows, macOS and Linux. | |
| Kickstarter | App for the website kickstarter.com | Apache 2.0 | Also available for Android. | |
| Kiwix | An offline reader for Wikipedia | LGPLv3 | Also available for Android, Windows, macOS, Linux and as a browser extension. | |
| Kodi | An open source media player | GPLv2+ | Also available for Android, Windows, macOS, and Linux. | |
| Linphone | Video SIP/VoIP client | GPLv2 | Also available for Android. | |
| MAPS.ME | Offline maps and navigation using OpenStreetMap data | Apache 2.0 | Also available for Android. | |
| Mastodon | Official app for the Mastodon decentralized social network | GPLv3 | Also available for Android. | |
| Meshtastic | Official iOS Meshtastic client app for the Meshtastic decentralized network | GPLv3 | Also available for Android. | |
| Mullvad | The Mullvad VPN client app for iOS | GPLv3 | Also available for Android, Windows, macOS, and Linux. | |
| MuPDF | PDF reader | AGPL v3+ | Also available for Android, Windows, and Unix-like systems. | |
| NetNewsWire | RSS reader | MIT | Also available for macOS. | |
| Nextcloud | File sync and share, with encryption possible | GPLv3 | Also available for Android, Windows, macOS, and Linux. | |
| Nextcloud Talk | Chat, voice and video calling | GPLv3 | Also available for Android. | |
| NymVPN | VPN service | Also available for Android, MacOS, Linux, and Windows. | ||
| OnlyOffice | Open-source office suite compatible with Microsoft Office | AGPL v.3 | Also available for Android, Windows, macOS, and Linux. | |
| Open Food Facts | Open-source and open-data food scanner | Apache 2.0 | Also available for Android. | |
| Onion Browser | An open-source, privacy-enhancing web browser for iOS, utilizing the Tor anonymity network | |||
| Organic Maps | Offline maps and navigation using OpenStreetMap data | Apache 2.0 | Also available for Android and on F-Droid and AppGallery. | |
| OsmAnd | Offline maps and navigation using OpenStreetMap data | MIT | Also available for Android. | |
| OwnCloud | File sync and share | GPLv3 | Also available for Android, Windows, macOS and Linux. | |
| Proton Drive | Remote file storage, sync/share | Integrates with Proton Docs and Proton Sheets. Also available for Android. | ||
| Proton Mail | E-mail client | GPLv3 | Also available for Android. | |
| Proton Pass | Password manager | Also available for Android. | ||
| Proton VPN | VPN service | Also available for Android. | ||
| Signal | Encrypted instant messaging, voice and video calling | GPLv3 | Also available for Android, Windows, macOS, and Linux. | |
| Session | Encrypted, decentralized, privacy-focused messaging & calling without any meta-data collected | GPLv3 | Also available for Android, Windows, macOS, and Linux. | |
| Simplenote | Encrypted notes | GPLv2 | Also available for Android, Windows, macOS and Linux. | |
| Surespot | Encrypted instant messaging | GPLv3 | Also available for Android. | |
| Telegram | Instant messaging | GPLv2 | Also available for Android, Windows Phone, and Firefox OS. | |
| Threema | Encrypted instant messaging, voice, video, and group calls | AGPLv3 | Also available for Android, Windows, macOS, Linux and web. | |
| Tuta | Email client | GPLv3 | Also available for Android, Windows, macOS and Linux. | |
| Vim | A port of the UNIX based text editor to iOS, with syntax highlighting | Free software | ||
| VLC for iOS | A port of the free VLC media player | MPL 2.0 GPLv2+ | ||
| The White House | The official White House app | MIT | ||
| wikiHow | wikiHow app | GPL | ||
| Wikipedia | The official Wikipedia app | MIT | Also available for Android, webOS and Kindle. | |
| Wire | Encrypted instant messaging, voice and video calling | GPLv3 | Also available for Android, Windows, macOS and Linux. | |
| WordPress | The official WordPress app | GPLv2 | Also available for Android. |