Your next favourite app.
Out in the open.
Discover open-source Android apps for the things you do every day. Clear choices, useful context, and a direct path to the source.
Start small. Find one app that fits your day.
What would you like to do?
Useful tools. Your choice.
Explore by task, then take a closer look at the official project.
Quillpad
Give your ideas a little more structure. Markdown notes, notebooks and tags.
Is it right for me?
Consider it for longer notes and organized collections. Check backup and restore with a sample note before moving your own content.
Fossify Notes
A straightforward place for quick notes, everyday lists and things worth remembering.
Is it right for me?
Compare its simple writing workflow with Quillpad. Check current installation options and export behaviour on the project page.
Tasks.org
Bring your to-dos together with an open-source task manager for Android.
Is it right for me?
Consider the reminder and synchronization options you actually need. Some services or distribution routes may involve payment; check the current terms.
Fossify Calendar
Make room for your plans with a calendar for events and everyday scheduling.
Is it right for me?
A calendar organizes events; a task manager organizes to-dos. Check calendar synchronization and permissions for your preferred setup.
Material Files
Browse and organize Android files with a familiar Material-style interface.
Is it right for me?
Start with copied test files when trying file operations. Android permissions and storage access depend on your device and version.
Fossify File Manager
Keep everyday file browsing and organization close at hand.
Is it right for me?
Compare navigation, storage access and file operations with your current manager. Back up important files before moving or deleting them.
No apps found
Try a different word, or return to the full collection.
6 apps to explore · Source-based summaries checked 15 September 2026. These are not hands-on reviews or security certifications.
Meet Quillpad.
Make room for your ideas.
Markdown, notebooks and tags bring structure to your writing. Read our source-based overview to see where it might fit—and what to check before switching.
Explore Quillpad ↗Open source, made approachable.
What does open source actually mean?
Understand the idea behind the apps, without getting lost in the terminology.
Start learning ↗02 / YOUR FIRST CHOICEFind an app that fits your day.
A short checklist for features, permissions, costs and official installation routes.
Find your fit ↗03 / A THOUGHTFUL SWITCHTry something new. Keep what matters.
Test with sample files and check your backup before making a move.
Make a start ↗Less guesswork.
More understanding.
We are an independent guide to open-source Android apps. Our aim is simple: help you understand your options and find the official source.
We distinguish project descriptions from hands-on findings. Our current collection uses official project documentation; we have not independently security-audited these apps. Open source is a starting point for informed choices, not a guarantee of safety.
How to read our recommendations ↗Before you explore.
Are all open-source apps free to use?
Open source describes the software’s licensing and availability of source code. Developers may charge for distribution, services or features. Check each project’s current terms.
Can I download apps from OpenAppVault?
We do not host APK files. Each app card links to its official project, where you can review installation options, requirements and current releases.
Does open source mean an app is automatically safe?
No. Review the source of the download, permissions, maintenance information and whether the app fits your needs. Our summaries are not security audits.