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Roadstr

Roadstr is an open-source, decentralised navigation app for Android, built on the Nostr protocol. It combines turn-by-turn GPS navigation with road reports that people publish as Nostr events, public-transport journeys, on-device voice guidance and voice search, Lightning tips for contributors, and map data from OpenStreetMap — with no account, no central server and no analytics.

Current version: 1.2.0 — a native Kotlin app (Jetpack Compose and MapLibre Native). Android only, Android 7.0 or newer. Download it from the latest release.

Start here

I want to…	Read
Install Roadstr and check the download is genuine	Installation
Set it up the first time	Getting started
Find my way, choose a router, understand the HUD	Navigation
Use maps and routing without a connection	Maps and offline use
Search for places, explore an area, use the microphone	Search and Explore
Report or confirm a hazard, speed camera or jam	Road reports
Understand how Nostr, Amber and bunkers fit in	Nostr and sign-in
Plan a journey by bus, tram or train	Public transport
Know exactly what leaves my phone	Privacy
Look up a setting	Settings reference
Fix something that does not work	Troubleshooting and FAQ
Build it, change it, translate it	Build from source, Contributing, Localisation

What Roadstr is built on

• Open data, open code. Maps and places come from OpenStreetMap; the code is MIT-licensed.
• No accounts. You can use all of navigation, search, offline maps and voice without signing in to anything. A Nostr identity is only needed to publish or confirm road reports and to sync saved places.
• Your key stays out of the app. You sign in with a signer — Amber on the same phone or a remote bunker — so Roadstr never holds your private key.
• On-device AI, no cloud. Spoken instructions and voice search run on the phone; no audio is sent to a service.
• Honest limits. Features that have not met the real world say so. A ✅ means shipped; 🧪 means experimental or not yet tried on real hardware.

Feature overview

✅ shipped · 🧪 experimental, off by default

Area	What it does	Status
Navigation	Turn-by-turn on OSRM, GraphHopper or OpenRouteService; alternatives; saved routes; works with the screen off	✅
Safety data	Speed limits, community and OpenStreetMap speed cameras, ZTL / limited-traffic zone warnings	✅
Road reports	Kinds 1315–1318 over Nostr: report, confirm, dispute, correct, zap	✅
Offline	Downloadable offline maps and offline routing packages	✅
Search	Place search in plain language, category search, Explore, optional web results	✅
Public transport	Transitous (worldwide) and Entur (Norway): journeys, stops, departure boards	✅
Voice guidance	Kokoro-82M (and Piper for German), on the phone	✅
Voice search	Parakeet TDT 0.6B v3 recognising speech on the phone	🧪
Journey	Opt-in distance tracking per mode and 17 achievements; encrypted sync is a second opt-in	✅ / 🧪
Interoperability	Read and write the open jooray/roadstr report format	✅
MeshCore radio	Send and receive reports over LoRa — not yet tested on real radios	🧪
Lightning	Zaps to reporters, Nostr Wallet Connect	✅
Languages	27	✅

Project links

• Source and issues: https://github.com/roadstrapp/roadstr-app
• Releases and checksums: https://github.com/roadstrapp/roadstr-app/releases
• Change history: CHANGELOG
• Third-party licences: THIRD_PARTY_NOTICES