ZYRNTOPO
The offline topo app you own — no subscription.
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.
How ZYRNTOPO compares
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.
Own it once, not every year
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 without the renewal
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.
Tactical capability, consumer simple
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.
See it on your own map
Free to try in the browser — no install, no account. Download the app when you're ready and it's yours.