FOSS apps: free and open source

Free and open-source software: the source code is public under an open licence.

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Nostr.Box Locate

Find which Nostr relays hold your events, and purge them.
- System & tools
- FOSS
- Free
- Nostr
- Android only
Zapstore
Nostria

Your Social Network
- Multimedia
- FOSS
- Free
- Android only
Zapstore GitHub
Nostria

Your Social Network
- Multimedia
- FOSS
- Free
- Android only
Zapstore Google Play Aurora Store GitHub
Nostrich: Nostr Client

Explore Nostr, Discover People
- Communication
- FOSS
- Free
- Nostr
- Android only
Zapstore Google Play Aurora Store
Nostrmo

A nostr client.
- System & tools
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
Nostrord

Nostr NIP-29 group messaging client
- Communication
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
Nostrpay

Bitcoin made simple for kids!
- Finance
- FOSS
- Free
- Nostr
- Android only
Zapstore
noStrudel

A sandbox for exploring nostr
- System & tools
- FOSS
- Free
- Nostr
- Android only
Zapstore
Nostrwatch

Nostr & Yakbak for WearOS. Do not install on the phone, it will not run. Download the apk file and sideload onto the watch using adb.
- Internet
- FOSS
- Free
- Nostr
- Android only
Zapstore
Nowser

A nostr signer.
- Security & privacy
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
nstrfy.sh

ntfy.sh-shaped push notifications over nostr
- System & tools
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
ntrack

Encrypted, serverless live location sharing over Nostr
- Security & privacy
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
Nucube

Player for collectors. Built for the music you own.
- Multimedia
- FOSS
- Free
- Android only
Zapstore
Numo

The Bitcoin PoS
- Finance
- FOSS
- Free
- Android only
Zapstore GitHub
Nunlock

Track phone unlocks and sync to Nostr.
- Security & privacy
- FOSS
- Free
- Nostr
- Android only
Zapstore
Nutri

Nutri is a multilingual offline Android nutrition reference app with calories, macros, vitamins, minerals, amino acids, fatty acids and…
- System & tools
- FOSS
- Free
- Android only
Zapstore GitHub
Nymbot - Private AI Assistant

Frontier AI models over encrypted Nostr. No account, no phone number, paid in sats.
- Security & privacy
- FOSS
- Free
- Nostr
- Android only
Zapstore Google Play Aurora Store
Nymchat - Geohash Mesh Chat

Encrypted chat with Bluetooth mesh. No phone number, no account, works offline.
- Communication
- FOSS
- Free
- Nostr
- Android only
Zapstore Google Play Aurora Store
Offline Entropy Manual

Offline guides for generating Bitcoin seed entropy with dice, coins, and cards
- Finance
- FOSS
- Free
- Android only
Zapstore GitHub
Offline Music

Keep your music library useful offline.
- Multimedia
- FOSS
- Free
- Android only
Zapstore
Offline Speech to Text (OSTT)

Private, fully offline speech to text for Android
- Productivity
- FOSS
- Free
- Android only
Zapstore
Olas

Beauty is in the eye of the hodler
- System & tools
- FOSS
- Free
- Android only
Zapstore GitHub
Onyx

Private, encrypted note-taking app with AI productivity tools
- Productivity
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
Open Bitcoin Tracker

A private, open-source value tracker for your bitcoin stacks
- Finance
- FOSS
- Free
- Android only
Zapstore GitHub
Oubli

A self-custodial private Bitcoin wallet on Starknet
- Finance
- FOSS
- Free
- Android only
Zapstore
Pages by Form*

Private, encrypted notes and documents stored on the decentralized Nostr network — no servers, no surveillance, just your words.
- Productivity
- FOSS
- Free
- Nostr
- Android only
Zapstore
Payky

Payky combines bank transfers, cash, and Bitcoin payments in one local-first payment terminal.
- Android only
Zapstore GitHub
PearCal

Peer-to-peer calendar — share events with people, not platforms
- Calendar
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
PearCinema

Your film and television collection, playable anywhere, without exposing your server to the internet
- Multimedia
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
PearCircle

Peer-to-peer location sharing — no accounts, no tracking
- Navigation
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
PearGuard

Peer-to-peer parental controls - manage screen time without a middleman
- Security & privacy
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
PearList

Shared household lists over peer-to-peer - groceries, to-dos and chores, no account
- Productivity
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
PearOffice

Spreadsheets, documents and slides you share and edit together - no account, no server, no cloud
- Productivity
- FOSS
- Free
- Android only
Zapstore GitHub
PearPetal

Private peer-to-peer menstrual & fertility cycle tracker - no account, no server, no cloud
- Health & fitness
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
PearTune

Your music collection, playable anywhere, without exposing your server to the internet
- Multimedia
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
Pika

End-to-end encrypted messaging for iOS and Android, built on MLS over Nostr.
- Security & privacy
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
Pika

End-to-end encrypted messaging for iOS, Android, and Desktop, built on MLS over Nostr.
- Security & privacy
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
Pinosu

A decentralized web bookmark app for Android, powered by Nostr
- Internet
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
PlebQR India

Pay Indian merchants using Bitcoin Lightning Network
- Finance
- FOSS
- Free
- Android only
Zapstore
Plektos

Nostr calendar app for events and scheduling
- Calendar
- FOSS
- Free
- Nostr
- Android only
Zapstore
Pokey

Nostr pull notifications on Android
- System & tools
- FOSS
- Free
- Nostr
- Android only
Zapstore IzzyOnDroid GitHub
Pollerama

Pollerama is a next-generation decentralized social platform built on the Nostr protocol, empowering users to create, share, and interact…
- Communication
- FOSS
- Free
- Nostr
- Android only
Zapstore
Poltergeld

Homescreen widget for your self-hosted Ghostfolio portfolio
- Finance
- FOSS
- Free
- Android only
Zapstore GitHub
PosterChan

A Nostr-powered personal cloud and self-hosted AI — notes, calendar, contacts, files, passwords
- Productivity
- FOSS
- Free
- Nostr
- Android only
Zapstore GitHub
Postr

A tiny Nostr composer for Android. Post. That's all.
- Communication
- FOSS
- Free
- Nostr
- Android only
Zapstore
Primal

Bitcoin wallet and Nostr social media in one app.
- Communication
- FOSS
- Free
- In-app purchases
- Nostr
- Android only
Zapstore Google Play Aurora Store GitHub
PrivacyNotes

Notes. Tasks. Files. Vault. Zero knowledge.
- Productivity
- FOSS
- Free
- Android only
Zapstore GitHub
Private Provider

Private, attested AI chat — plus build, sign and publish from the phone.
- Communication
- FOSS
- Free
- Nostr
- Android only
Zapstore