CalTopo delivers satellite-ready offline mapping for backcountry adventures, with powerful layers and seamless cross-device syncing. Trusted by professional guides and SAR teams, it enables offline planning, real-time updates, and collaborative map sharing. With 100,000+ total downloads and TRANSPORTATION rankings in AU (#87), SK (#121), and CA (#156), CalTopo remains a trusted choice for rugged terrain navigation.
Pros & Cons
Offline-first functionality with satellite-ready maps
Seamless cross-device synchronization between online and mobile
Rich backcountry data layers for planning (slope shading, weather, avalanche forecasts)
Comprehensive imagery and data layers (Topo, NAIP, public lands, weather)
Strong professional relevance for guides and rescue teams
Lacks explicit live navigation or routing features compared to some competitors
About CalTopo
CalTopo is a maps & navigation app developed by CalTopo LLC.
Download Statistics
CalTopo has been downloaded 320 thousand times. In the last 30 days, the app was downloaded 10 thousand times. It is ranked in the top 100 maps & navigation apps.
User Ratings
CalTopo is rated 4.71 out of 5 stars. The rating is based on 6 thousand ratings.
App Information
CalTopo is FREE to download. The APK download size is 33.10 MB. The latest version available is 1.28. The last update was on July 15, 2026.
Technical Requirements
CalTopo requires Android 5.1+ or higher. The app has a content rating of Everyone. The app has been available on Google Play September 2020.
Description
New on CalTopo: the CalTopo app is now satellite ready, allowing you to use many features of the app offline with satellite data!
Take the best mapping app with you wherever you go with the CalTopo app for Android. Trusted by professional mountain guides, avalanche educators, and search and rescue teams, CalTopo has all the features you need to plan your next off-grid pursuit. Seamless integration between CalTopo online and your mobile device allows you to access and update your maps no matter where you are. Any changes you make will automatically sync across all devices, making exporting and importing your latest map a thing of the past.
The CalTopo app allows you to easily take your planning and navigation to the next level. Real time decision making in backcountry terrain is made easy with the ability to download maps and layers like slope angle shading to your device for offline use. Plan for conditions on your route with sun exposure, wind, precipitation and avalanche forecasts. View and track your location on the map using GPS, even if you are offline. Share maps with your teams or travel partners to plan collaboratively, and to ensure everyone has the necessary data. Monitor real time updates from the field, like your friends progress on a long outing with live tracking on shared maps.
Plan and navigate your next adventure with the CalTopo App today!
Map layers include: • MapBuilder Topo, Hybrid and Overlay • Forest Service Maps • Scanned Topos • Global Imagery • Shaded Relief • Slope Angle Shading (including high resolution elevation data where available) • Parcel data • Public Lands • Weekly Satellite Imagery • NAIP Satellite Imagery • Sun Exposure • Marine Charts • Weather Forecasting (including wind, precipitation, and temperatures) • Snow and Water Gauge Data • Fire History/Activity • And many more
Support and Feature Requests: Email us at help@caltopo.com.
Recent changes: Added the ability to get an email for a summary of your account and subscription details from the Account Page.
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For advanced functions, the learning curve is a bit steep. But for hiking, the layers and ability to draw a path are excellent
★★★★★Jared Desrochers· Mar 14, 2026
Find it very useful and a solid tool for mapping and navigation. Think the maps are generally better than other mobile ones.
★★★★★Denny Salisbury· Jul 22, 2026
This is an incredibly valuable tool for Search and Rescue as well as first responders in general. Caltrop/Sarto has been a game changer!
★★★★★Nick Mohr· May 7, 2026
This app is an invaluable tool for public safety, search and rescue, and situational awareness. We literally use this everyday, and it gives us an edge when life swings in the balance. Thank you for making it available to us at a reduced cost.
★☆☆☆☆Herb Zinn· May 28, 2026
BUG REPORT: under "map sheets", "add map sheet" says "loading shared map sheets", then hangs the app (on Samsung Galaxy S25 ultra) I can come back 5 minutes later, the whole user interface is greyed out, "shared map sheets" never populates.
★★☆☆☆M C· Mar 16, 2026
It's messy and lacks many town names for areas as well as labels for fairly popular hiking areas. Even if these places DID have labels they'd be overshadowed by the ugly way too thick lines haphazardly scribbled all over the map
★☆☆☆☆Weathered Soul· Mar 29, 2026
Gasps can locate me in my office within a few meters, but Caltrop, with Location turned on and Permission allowed, says it can't locate anything because Location is turned off. Removed Caltrop.
★★☆☆☆Pat Heron· May 9, 2026
I used to love Caltrop. Recently. The interface was changed, and I don't like it. I want to change the contour interval on my map, but apparently I am not allowed. Was the functionality of the basic subscription reduced? I may have to download my tracks and switch to a different service.
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Trust & Safety: This app requests standard location, camera, storage, network, and wake/sleep/foreground service permissions consistent with mapping apps. It also includes ad-related and install-referrer-type permissions. Overall, the permissions align with offline mapping and collaboration features, with no indication of unusual permissions.
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