Track your rides without tracking you.
No account. No cloud. No data collection.
One file. Your device. Your data.
Speed, distance, elevation gain, and route map — all updating in real time as you ride.
Watch your ride animate on the map with live speed, elevation, and a glowing trail. Like a drone following you — all on device.
Real-time wind speed with headwind/tailwind detection, current weather, precipitation forecasts, air quality, UV index, and sunrise/sunset.
Tells you which direction to start riding so you return with the wind at your back. Nobody else does this.
Plan routes by tapping waypoints on a map. Save them with cached tiles for offline riding. No internet needed on the road.
Estimated calories from rolling resistance, aero drag, wind, elevation, and bike type. Heart rate zones adjusted for your fitness level.
Context-aware nudges: milestone proximity, pace comparisons, PR detection, streak reminders. In English, Dutch, German, and French.
Live elevation sparkline during rides. Per-km or per-mile splits with fastest split highlighted. Pace tracking for every ride.
1080×1080 route image cards. GPX export per ride. CSV bulk export. Your data, always portable.
Sluip is a single HTML file that runs entirely in your browser. No servers, no accounts, no analytics, no cookies. Your ride data is stored in IndexedDB on your device and nowhere else.
Sluip is a Progressive Web App — it installs from your browser and works like a native app. No app store needed.
Navigate to the Sluip URL in Safari (not Chrome or other browsers — iOS only supports PWA install from Safari).
Tap the share icon (the square with an upward arrow) at the bottom of the Safari toolbar.
Scroll down in the share sheet and tap "Add to Home Screen". You can keep the name as "Sluip" or change it.
Tap "Add" in the top-right. Sluip will appear on your home screen with the wheel icon. It now runs fullscreen like a native app.
Navigate to the Sluip URL in Chrome (or any Chromium browser like Brave, Edge, etc.).
Chrome will usually show an "Install app" banner at the bottom of the screen. If you see it, just tap Install.
If no banner appears, tap the three-dot menu (⋮) in the top-right, then tap "Install app" or "Add to Home screen".
Tap "Install" in the dialog. Sluip will be added to your app drawer and home screen.
Navigate to the Sluip URL in a Chromium-based browser.
Look for the install icon (a monitor with a down arrow) in the address bar on the right side. Click it.
Click "Install" in the dialog. Sluip opens in its own window and can be launched from your desktop or taskbar.
Yes. All data is stored in your browser's IndexedDB — on your device only. No accounts, no cloud sync, no analytics, no cookies. We never see your rides. The only external call is to Open-Meteo for weather data (Pro only), which receives your coordinates but doesn't track users.
Your browser's Geolocation API provides GPS coordinates. Sluip records them directly into IndexedDB on your device. Nothing is uploaded. When you close the app, your data stays right where it is — on your phone.
Your rides and settings would be lost. That's why Sluip has a backup/restore feature — export your data as a JSON file anytime, and import it back if needed. We recommend backing up regularly.
Yes. Once installed as a PWA, Sluip works offline. GPS tracking, ride recording, and all local features function without an internet connection. Weather data requires a connection but the app itself does not.
Sluip uses a physics-based model accounting for rolling resistance, aerodynamic drag, wind, elevation gain, rider weight, and bike weight. It's more accurate than simple speed-based estimates but it is an estimate — not a medical measurement.
Free users can export individual rides as GPX files. Pro users can export all rides as a CSV spreadsheet and share route images (1080×1080) to social media.
Because subscriptions are designed to extract maximum revenue over time. Sluip costs almost nothing to run (no servers, no user database), so a one-time price is sustainable and honest. You pay once, you own it forever.
Yes — install it from Safari as a PWA. iOS has some PWA limitations (no background GPS when the screen is off), so keep the screen on during rides. Sluip's "Keep Screen On" feature (Pro) prevents your phone from sleeping during a ride.
English, Dutch (Nederlands), German (Deutsch), and French (Français). The interface, encouragement messages, and achievements all translate.
Yes. Sluip meets WCAG AAA (7:1 contrast ratios) in both light and dark modes. It includes adjustable text sizes, high contrast mode, audio cues, keyboard navigation, screen reader support, and skip-to-content links.