Health, home and travel decision
Gaia GPS
A capable developer can build a useful offline maps + GPX recording app (core features) using existing open-source pieces, but reproducing the full commercial product (catalog, paid plans, community, polish) is larger and not justified for single-developer rebuild.
Visit website↗Open-source builds that already do this
Every project below is open source and already does this job today. Fork one, self-host it, or take the parts you need — the build prompt further down assumes an empty file, and this is the shortcut past that. Licences differ; check the one on each card before you ship.
What a replacement has to do
- Display maps (tiles/vector), load offline maps, record GPS tracks, import/export GPX, render route and user location on map.
What it still won’t have
- Proprietary trail catalog and curated content
- Integrated commercial account features (gifts, professional plans)
- Existing community/forums and help resources
What remains hard
- Product polish and ongoing maintenance
First-year cost
Keep paying
Paying is—cheaper in year one.
On cash alone, building overtakes the subscription at 14 seats.
Money you would actually spend
Time you would spend
—
What you would spend
What we assumed
The verdict above measures whether you could build it. This one is only about money.
Runnable build prompt
Build a minimal Gaia GPS-style app using React Native (Expo), a Node.js + Express backend with Postgres, and a vector-tile server (TileServer GL or self-hosted vector tiles). In scope: interactive map view, user GPS tracking and GPX export/import, offline tile pack download and local lookup, simple route/trail list with search, user authentication, and sync of saved routes to Postgres. Out of scope: payment processing, multi-tier subscriptions, curated trail catalog ingestion, community forums, advanced terrain analysis. Include error handling, retries for downloads, and unit/integration tests for GPS recording, GPX import/export, offline lookup, and API endpoints.
How we checked
How the score was reached
- Partly verdict base52
- An open-source build was found+5
- 5 cited sources+3
- 3/3 assessment runs agreed+4
- Evidence score64
The base comes from the verdict. Everything under it is a check that either happened or did not, and each one is a fact frozen in this record rather than a judgement made at render time — so the same evidence always produces the same number.
How scoring works →Cited sources · 5
Every page the run actually retrieved.
- official productGaia GPS — official product
- official productGaia GPS — site links
- official productGaia GPS — purchase options
- open sourceorganicmaps/organicmaps
- open sourceFASTSHIFT/X-TRACK
Integrity checks
What held up, and what did not.
