Sufferplanv2.5FR

Plan your ultra.
Pace it right.

A pacing plan calibrated from a GPX file — by bike or on foot — profile, resupply, weather, cut-offs — then a mobile app to follow it, even offline, on race day.

Open the cockpit →
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Cockpit — prepare App — track
Step 1 · start here

Cockpit — prepare

Know your finish time and pace before you even start. On desktop: load a GPX, calibrate your model, enrich the route (OSM, weather, sun), generate your plan and export it.

GPX → plancalibrationmap + profilerace / touring
Open the cockpit → Step 2 · race day

App — track

Know if you're ahead or behind, in real time — even with no signal. On your phone and offline: import your plan (GPS position, ETA, next points and cols, resupply, weather). Add it to your home screen.

offlinereal-time ETAGPSiOS / Android
Open the app →

Quick guide

1

Prepare (on desktop)

  1. Open the Cockpit and pick the sport (bike / running) and the mode (race / touring).
  2. Load your GPX file.
  3. Set the parameters: power (bike) or climb/descent speeds (running); in touring, max distance + climb per day.
  4. Enrich: OSM (water, toilets, shops), weather, sun.
  5. Click Compute, then export plan.json (for the app) and parcours-POI.gpx (for your GPS).
2

Install the app

iPhone — open the app in Safari, tap Share (square with ↑ arrow), then "Add to Home Screen".
Android — open the app in Chrome, menu ⋮, then "Install app".
Once added to the home screen, it opens full-screen and works offline (airplane mode).
3

Track your ride

  1. In the app, import your plan.json (sent via AirDrop / share) — it stays saved.
  2. Set your position (slider or 📍 GPS) and your real start time.
  3. You continuously see the ETA, ahead/behind, the next points and cols, resupply and weather.

A question or some feedback?

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