Terms of Use
Last updated: 16 August 2026
These terms govern your use of Wattmark ("the app"). By downloading or using the app, you agree to them.
1. What the app does
Wattmark analyses cycling ride files (FIT), computes training metrics, works backwards from a goal you choose, and produces AI-written analysis of your rides.
2. Not medical
Wattmark is a training tool for healthy adults. It is not a medical device. It does not diagnose, treat or prevent any condition.
Consult a physician before starting an exercise programme or substantially changing one. Stop immediately if you feel unwell while riding. Nothing the app tells you replaces the judgement of a physician or other qualified professional.
3. About the numbers
The app shows both measured and estimated values.
- Estimates are always labelled as estimates and always given as a range. Power is estimated only on climbs steeper than 4%, and never on flat terrain
- Estimated power depends heavily on the total weight you enter. A 10% error in total weight produces roughly a 10% error in the estimate
- FTP estimates, weeks-to-goal figures and training plans are indications, not guarantees of any outcome
- The methods and assumptions are set out in "How this is calculated" inside the app
4. AI analysis
AI analysis is generated using Anthropic PBC's Claude API. Generated content may be wrong. Decisions based on it remain yours.
What is transmitted is described in the privacy policy, and nothing is sent without your prior consent.
5. Subscription
- Your first AI analysis is free. Further analyses require a paid subscription
- After a 7-day free trial: ¥1,200 / $9.99 per month, or ¥9,800 / $79.99 per year (prices vary by region)
- Payment is charged to your Apple ID account at confirmation of purchase
- The subscription renews automatically unless cancelled at least 24 hours before the end of the current period. Renewal is charged within 24 hours before the period ends
- You can view, change or cancel your subscription in your App Store account settings
- Any unused portion of a free trial is forfeited when you purchase a subscription during the trial
- Refunds follow Apple's policies. We cannot issue refunds directly
6. What you may not do
- Decompile or disassemble the app, except where law permits
- Access our servers automatically or in bulk
- Import another person's ride data without their consent
7. Intellectual property
The app and its contents remain ours. The ride data you import remains yours.
8. Disclaimer
The app is provided as is. To the extent permitted by law, we are not liable for damages arising from your use of, or inability to use, the app, except where caused by our intent or gross negligence.
9. Apple
These terms are between you and us, not between you and Apple Inc. We, not Apple, are responsible for the app. Apple gives no warranty in respect of the app. Apple and its subsidiaries are third-party beneficiaries of these terms and may enforce them against you.
10. Trademarks
"Load", "Weighted Power" and "Intensity" in this app are our own implementation of published calculation methods and are in no way affiliated with TrainingPeaks LLC or its affiliates. Wattmark is not affiliated with Strava, Inc., Garmin Ltd. or any other company. All names and trademarks belong to their respective owners.
11. Changes and governing law
We may revise these terms. Material changes will be announced in the app.
These terms are governed by the laws of Japan. The Tokyo District Court shall have exclusive jurisdiction as the court of first instance for any dispute relating to the app.
12. Contact
For questions about these terms, contact support@wattmark.app.
Yodaka LLC (合同会社ヨダカ)