Avyline - Backcountry Ski Map
See avalanche terrain first
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
The slope under your feet, on an offline 3D map — with opt-in steep-terrain alerts. Know the angle before you commit.
Avyline marks avalanche terrain in red on a fully offline 3D map — see exactly what you're getting into before you go. The angle under your feet, the steep ground ahead and the official avalanche forecast, all on one map that works with zero cell signal.
REAL-TIME TERRAIN AWARENESS
• SlopeGuard reads the slope under your feet at all times and, if you turn alerts on, gives a one-time warning when you enter terrain steeper than your threshold (off by default to avoid alert fatigue).
• 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 — in regions those services cover.
• 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 (~5–40 MB, sized to its area and resolution) 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.
• Terrain Exposure layer classifies avalanche terrain into three in-house exposure grades (1–3) — computed on-device from elevation data, honestly labelled as not an official rating.
• 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.
• Browse curated classic lines and community ski tours with elevation profile and avalanche-exposure percentage (free in regions that have them).
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): the full planning toolkit — route planning with elevation profile, avalanche-exposure percentage and estimated time, follow-the-route navigation on the ground with off-course alerts, and post-run review of your recorded tracks — plus additional region downloads for trips away from home.
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/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
- Accuracy & honesty: slope readings now show a ± margin that also accounts for the elevation data's resolution, so coarser data is never shown as more precise than finer data.
- Slope alerts are now opt-in (off by default), with an adjustable steepness threshold and a permanent off switch.
- Cleaner data: the ski-tour library was pruned of non-touring loops with corrected route lengths, and the region catalog is curated to 240 backcountry areas.
- Visual refinements: clearer satellite imagery, graded hazard highlighting, and Terrain Exposure relabeled to in-house grades 1–3.
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
- 9.8 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 $59.99
- Avyline Pro Monthly $3.99
- Avyline Pro Annual（≤30） $19.99
- Copyright
- © 2026 Avyline