How we compare
Not a wearable. Not a training plan. A third thing.
DecisionEngine is an iPhone app that turns your health and training data, your goal and your recent load into exactly one training decision for the moment you ask — computed on the device, with the reasoning. Unlike with Whoop or Oura it doesn't stop at a score; unlike with TrainingPeaks there is no rigid plan.
DecisionEngine replaces neither your watch nor your race goal — it translates both into a daily decision, vendor-neutral and without locking you to one device.
Whoop, Oura & co: a score, not a decision
These devices tell you how recovered you are. They don't tell you what to actually train today.
No conflict: what your wearable writes to Apple Health, DecisionEngine uses — it translates the value instead of replacing it.
Garmin, COROS, Suunto: the ecosystem only rates itself
Each watch mainly sees what it recorded itself.
Vendor-neutral, deduplicated — and switching devices costs no training history: the profile belongs to the athlete, not the device.
TrainingPeaks, TrainerRoad, Zwift: the plan is already set
A weekly plan is written before the week starts. It doesn't know about your brutal Wednesday at the office.
No conflict with a race goal: phase tolerances (base, build, peak, taper) stay — only the individual day isn't prescribed.
For honesty's sake: what DecisionEngine isn't
- Not a replacement for a GPS device on your wrist. DecisionEngine needs an existing data source — an Apple Watch or a connected provider.
- No cloud AI. Everything is computed on the iPhone. There's no server of ours that raw data is sent to.
- Not a medical device. The app gives training recommendations, not a medical diagnosis or treatment.
MichaelFounder and developer
A score tells you how you're doing. I wanted to know what to train today. We're all unique people and no two days are the same — so what comes out is a decision, not a number I have to interpret myself.