Stack My Trails

Stack My Trails reads your workout routes from Health Connect and stacks them on a single map, creating a beautiful heatmap-like visualization. Record workouts in the app, import and export GPX files, or draw your own GPS art by placing waypoints.

See all your runs, walks, hikes, and cycling routes layered together. Discover your favorite paths, explore patterns in your training, and turn your routes into art.

No subscriptions, no accounts, no cloud. Your data stays on your device.

KEY FEATURES

• Import workout routes from Health Connect with one tap
• Export and import routes as GPX files
• Export and import your trail data as a backup file
• Record new trails directly in the app — GPS tracking with live route display
• Recorded workouts are saved to Health Connect automatically
• Draw custom routes on the map — place waypoints and get real walking directions between them
• Stack up to 500 routes on a single map view
• Create stunning poster images with 10 artistic filters
• Vignette quick-toggle: cycle off / medium / full in the poster toolbar
• Adjust trail thickness, glow, labels, and decorative frames
• Frame and rotate your poster for the perfect composition
• Save posters to your photo library or share them
• Browse all your trails in a scrollable list with preview maps
• Filter by area, date range, and activity type
• Show your current location on the trail map to discover new routes and unvisited directions
• Built-in GPS spoofing filter for accurate route display in affected areas
• Full dark mode support

YOUR DATA, YOUR DEVICE

Stack My Trails stores everything locally on your device. No accounts, no servers, no tracking. Your workout data is yours. Network requests are limited to a geocoding service during import (to convert coordinates into place names) and, when using route drawing with your own API key, to OpenRouteService (to compute walking routes between waypoints).

POSTER THEMES

• Noir: Dark background with glowing trails
• Architect: Navy blue tones with cool light blue paths
• Artistic: Pigment-ink style with curated paper palette
• Clean: Pure map view with subtle trail overlay
• Gradient: Trails rendered as flowing color gradients
• Pixel: Retro pixel-art grid style with editable color palette
• Risograph: Halftone print style with authentic ink misregistration offset
• Voronoi: Geometric cell diagram
• Halftone: Dot-matrix print style
• Glyph: Typographic ASCII-art style

ABOUT HEALTH CONNECT ROUTES

Stack My Trails requires workout routes with GPS coordinates. Many fitness apps save only basic workout data (duration, calories) to Health Connect without GPS routes. Before importing, check that your fitness app actually records exercise routes to Health Connect — look for route data in the Health Connect app under Exercise Sessions.

If your fitness app doesn't save routes to Health Connect, use Stack My Trails' built-in recording to track your runs, walks, rides, and hikes directly. Recorded routes are saved to Health Connect so they're available across all your health apps.

ROUTE DRAWING

Stack My Trails includes a route drawing tool — long-press on the map to place waypoints and create walking routes. Route drawing uses the OpenRouteService Directions API to compute walking paths between your waypoints. This requires a free API key from openrouteservice.org (no credit card needed). Enter your key in Settings to enable routed paths. Without a key, the drawing tool still works but connects points with straight lines instead of walking routes.

When you use route drawing with an API key, only the waypoint coordinates are sent to OpenRouteService to calculate the route. No other data is transmitted.

REQUIREMENTS

• Android 14 (API level 34) or later
• Health Connect app installed
• Workouts must have GPS route data in Health Connect (check your fitness app's Health Connect integration)
• Location access is used for trail recording and optionally to show your position on the map