CalTopo vs Gaia GPS for slope angle.

Two of the best-known backcountry mapping tools, compared on slope angle, offline use and coverage, and where Traverse fits if you ski or hike in the Western Balkans.

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/ The short answer

Pick by how you go out.

CalTopo and Gaia GPS are mature tools for backcountry planning, strongest in North America, and both have slope-angle shading. Traverse is not a replacement for either: it is a free 3D map whose slope and aspect layers cover Kosovo, Albania and the Sharr range, where the others have little local detail.

Feature	CalTopo	Gaia GPS	Traverse
Slope-angle shading	Yes. Online use was reported free; offline use with a subscription	Yes, as a map layer	Yes, free, but only for Kosovo, Albania and the Sharr range
Free tier	Free to use online, with limits	Free with limited maps; offline downloads need a paid plan	Free, no ads
Prices	Paid plans; see caltopo.com	Paid plans; see gaiagps.com	Free; optional Pro, see the pricing page
Strongest coverage	North America	North America, with maps worldwide	Western Balkans for slope, aspect and trails; 3D map worldwide
Printing maps	A reviewers’ favourite	Not its focus	Not available
3D map	Not its focus	Not its focus	Free 3D terrain in the browser and the app
Overdue alerts to a contact	Not its focus	Not listed when we checked	Free trip plans with step-by-step check-in alerts

Checked 7 October 2026. We could not confirm either company’s current prices from the sources available to us, so none are shown. Cells come from the companies’ own posts and independent reviews linked below; both change their plans from time to time. See all four apps side by side on the comparison page, or the Traverse pricing page.

/ Where each is strongest

Both have a place.

Traverse

Free 3D mountain terrain with slope and aspect in the Western Balkans, trip plans with check-ins, and an SOS that is honest about what it knows. It does not print maps and is not built for North American backcountry.

CalTopo and Gaia GPS

Serious planning and navigation tools with layered maps, slope shading and offline use on a subscription. CalTopo is known for printing and detailed layers; Gaia GPS for its phone app and map layers.

Want to see Traverse’s terrain first? Open the 3D hiking map or look at any track in the free GPX viewer. Coming from FATMAP? See the FATMAP alternative.

/ Questions

Which is better for slope angle, CalTopo or Gaia GPS?

Both show slope angle, and reviewers note they use a similar colour scheme with darker colours for steeper slopes. Which suits you depends on how you plan and navigate: try both free tiers.

Do CalTopo and Gaia GPS show avalanche danger?

Slope-angle shading shows terrain steepness, not avalanche danger. The snowpack on a slope can differ from the bare-ground angle underneath. Use the official avalanche bulletin and your own observations.

Is there a free alternative for the Balkans?

Traverse has free slope and aspect layers for Kosovo, Albania and the Sharr range. Outside that area its 3D map works, but the slope layer does not yet.

Can I look at a GPX track on slope shading?

Yes. Open it in the free GPX viewer; the slope layer shows wherever our tiles exist.

Is Traverse affiliated with CalTopo or Gaia GPS?

No. They are trademarks of their owners and are named here only to compare.

/ Sources

CalTopo and Gaia GPS are trademarks of their owners. Traverse is not affiliated with them.