LifePrint offers free self-study resources for American Sign Language, including signs and lessons.
Langx
Langx connects language learners worldwide for practice and immersion.
About Langx
Langx is an open source project, hosted on GitHub, that connects language learners with native speakers. Users practise the language they are learning by teaching the language they already know. The practice tools include speaking and chat, correcting each other's sentences, and a streak feature that tracks continued practice.
The same Expo codebase provides iOS, Android and web versions, backed by a single Fastify API. The project is licensed under BSD-3. Its tech stack uses MongoDB Atlas for data and an S3-compatible service for storage. Billing is handled through RevenueCat with StoreKit, Play Billing and Stripe. Self-hosting requires MongoDB running as a replica set, an S3-compatible bucket and an email key. Billing, translation and analytics are optional. Pricing for the hosted service is unknown.
Key features
- Connects learners with native speakers for practice exchanges
- Speaking and chat practice between learners
- Peers correct each other's sentences
- Streak tracking to record continued practice
- iOS, Android and web apps from one Expo codebase
- Self-hostable with MongoDB and S3-compatible storage
Best for: Language learners who want to practise by exchanging languages with native speakers, and developers who want to self-host or contribute to an open source language exchange app.
Good for
- Open source under the BSD-3 licence
- One codebase supports iOS, Android and web
- Setup guidance for self-hosting and contributing is documented in the repository
Watch out for
- Self-hosting requires MongoDB configured as a replica set, an S3-compatible bucket and an email key
- Running on a physical phone requires a development build rather than Expo Go
Langx at a glance
- Website
- github.com/langx/langx
- Category
- Education & Learning › Language Learning
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Langx FAQ
What does self-hosting require?
A self-hosted instance needs MongoDB, an S3-compatible bucket and an email key. Billing, translation and analytics are optional and degrade cleanly when they are not configured. Setup details are in docs/self-host.md.
Can I run the app on a physical phone?
Yes, but the source says a development build is needed rather than Expo Go. Details are in CONTRIBUTING.md.
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