Most outdoor mapping apps rent you access by the year. ZYRNTOPO is free to use with no ads or third-party trackers — offline maps, GPS tracking and live team sharing — and a one-time $40 Pro unlock (no subscription) adds 3D terrain, viewshed, unlimited offline downloads, PDF map sheets and tactical bridges, for backcountry travel, hunting, field work and search & rescue.
A rare overlap: consumer-simple, genuinely capable, and yours once instead of every year.
| ZYRNTOPO | Gaia GPS | OnX | ATAK | |
|---|---|---|---|---|
| Pricing | One-time purchase | Annual subscription | Annual subscription | Free (govt origin) |
| No account required | Yes | Account | Account | Varies |
| No ads or third-party trackers | Yes | — | — | — |
| Fully offline maps & 3D terrain | Yes | Yes | Yes | Yes |
| Line-of-sight viewshed | Yes | — | — | Yes |
| Live team location sharing | Yes | — | — | Yes |
| ATAK / Cursor-on-Target bridge | Yes | — | — | Native |
| Drone (MAVLink) telemetry | Yes | — | — | Plugin |
| Consumer-simple interface | Yes | Yes | Yes | Steep |
| Installs from an app store | Yes | Yes | Yes | Manual |
Compared on each product's standard consumer offering as of 2026. Competitor names are trademarks of their respective owners; capabilities vary by plan and change over time — check their current listings. "ATAK" is the Android Team Awareness Kit. ZYRNTOPO's core app is free; 3D terrain, viewshed, PDF map sheets, unlimited offline downloads, and the ATAK/MAVLink bridges are part of the one-time ZYRNTOPO Pro unlock.
ZYRNTOPO covers the core of what people use Gaia GPS for — offline topo maps, 3D terrain, GPS tracks and route/area drawing — as a one-time purchase with no account and no ads or third-party trackers, and adds viewshed and live team sharing on top.
Public-lands and ownership overlays, offline maps and GPS tracking in a one-time-purchase app — so backcountry and hunting trips don't ride on a membership you renew every season.
Viewshed, a real ATAK / Cursor-on-Target bridge and drone (MAVLink) telemetry — without running a TAK server or learning ATAK's interface. The power of ATAK for SAR teams and outdoors folks who just want it to work.
Free to try in the browser — no install, no account. Download the app when you're ready and it's yours.