Avyline
3D Backcountry Slope Map
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Real-time slope and avalanche-terrain alerts on an offline 3D map. Know the angle under your feet before you commit.
Avyline is an offline 3D slope and avalanche-terrain map built for backcountry skiers and splitboarders. It tells you the angle under your feet and the steep ground ahead — in real time, even with zero cell signal.
REAL-TIME TERRAIN AWARENESS • SlopeGuard warns you the instant the slope beneath you crosses 30°, with haptics and an on-screen banner. • Look-ahead radar scans the terrain in your direction of travel and flags steep slopes before you reach them. • Avalanche hazard highlighting paints dangerous terrain directly onto the 3D map, driven by the official forecast's elevation-band rating when one is available.
OFFICIAL FORECASTS, SHOWN HONESTLY • Avalanche danger ratings from official public warning services (avalanche.org member centers, SLF and EAWS partners), broken out by elevation band. • Ratings expire automatically at their validity end. "No rating" is shown as its own state — never as "low danger." • Every forecast shows its source and publication time.
TRUE OFFLINE 3D • Each region (~3–10 MB) packs high-resolution terrain, aerial/satellite imagery, contours, hillshade and place names — downloaded once, usable forever without signal. • Slope, aspect, contours and shaded relief rendered at 60 fps by an in-house engine. • Search peaks, passes and huts; save your own waypoints.
PLAN, RECORD, COME BACK • Record your track with the screen locked — a Live Activity keeps it visible. • One-tap backtrack along your recorded track, with off-route alerts. • Import/export GPX to move tracks and waypoints between tools.
FREE VS PRO • Free: one downloaded region and ALL safety features — slope alerts, look-ahead radar, hazard overlay, official forecasts, track recording and backtrack. Safety is never paywalled. • Pro (subscription): unlimited region downloads plus route planning with elevation profile, avalanche-exposure percentage and estimated time.
IMPORTANT Avyline is a decision-support tool, not a substitute for formal avalanche training, a current official forecast, beacon/shovel/probe or your own judgment. Terrain angles are derived from digital elevation data with finite accuracy, which the app discloses openly. Travel in avalanche terrain at your own risk.
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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The developer, 国刚 赵, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- 国刚 赵
- Size
- 9.6 MB
- Category
- Navigation
- Compatibility
Requires iOS 16.0 or later.
- iPhone
Requires iOS 16.0 or later. - Mac
Requires macOS 13.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Location
- This app may use your location even when it isn’t open, which can decrease device battery life.
- Languages
English and 8 more
- English, French, German, Italian, Japanese, Korean, Simplified Chinese, Spanish, Traditional Chinese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Avyline Founding Member $99.99
- Avyline Pro Monthly $4.99
- Avyline Pro Annual（≤30） $29.99
- Copyright
- © 2026 Avyline