In 2025, open-source Android apps continue to gain popularity among users who value transparency, customization, and cost-effectiveness. These applications not only offer robust productivity features but also empower users by allowing them to self-host or modify the source code to suit their specific needs. Here are the top 10 open-source Android apps for productivity in 2025:
1. AnkiDroid Flashcards
AnkiDroid is a powerful flashcard app that helps users memorize information efficiently using spaced repetition. It’s ideal for students, language learners, and professionals looking to retain knowledge over time .
2. Catima
Catima is an open-source inventory management app designed to help users organize their personal collections, whether it’s books, movies, or other items. Its simplicity and ease of use make it a favorite among minimalists .
3. GitJournal
GitJournal is a unique note-taking app that stores notes directly in Git repositories. This ensures version control and seamless synchronization across devices, making it a great choice for developers and tech-savvy users .
4. K9 Mail
K9 Mail remains one of the most trusted open-source email clients for Android. With its emphasis on privacy, customizable interface, and support for multiple accounts, it offers a secure and efficient email experience .
5. Loop Habit Tracker
Loop Habit Tracker is a simple yet effective tool for building and maintaining habits. By tracking daily progress and offering visual feedback, it helps users stay consistent with their goals, whether fitness-related, professional, or personal .
6. Joplin
Joplin is a feature-rich, open-source note-taking app that supports end-to-end encryption, markdown formatting, and cross-device syncing. It serves as a solid alternative to proprietary apps like Evernote .
7. Home Assistant
Home Assistant is an open-source smart home automation platform that allows users to control and monitor their connected devices from their Android phones. It integrates seamlessly with various IoT ecosystems, offering a centralized hub for smart home management .
8. Baserow
Baserow is an open-source, self-hostable Airtable alternative that enables users to create custom databases without requiring technical expertise. It’s particularly useful for teams needing flexible data organization tools .
9. AppFlowy
AppFlowy is an open-source productivity suite inspired by Notion, offering document collaboration, task management, and database creation. Its self-hosting capability makes it a popular choice for businesses prioritizing data sovereignty .
10. SmartSuite
SmartSuite is an open-source project management and workflow automation tool that provides customizable templates, collaborative features, and integrations. It’s ideal for entrepreneurs and small teams aiming to streamline operations .
Why Open Source Matters in Productivity Apps
Open-source software stands out in 2025 due to growing concerns around digital privacy and subscription fatigue. Unlike proprietary alternatives, open-source apps often come at no cost and allow users to inspect the code, ensuring there are no hidden tracking mechanisms or unwanted data collection practices. Additionally, many of these apps support self-hosting, giving users full control over their data .
For those looking to enhance their productivity while maintaining autonomy over their digital tools, these open-source Android apps provide a compelling mix of functionality, security, and flexibility.
Whether you’re managing tasks, organizing information, or automating workflows, these apps offer something for everyone—without compromising on ethics or performance.