Calibrate: Forecast Journal
Brier score and calibration
Only for iPhone
$2.99 · Designed for iPhone. Not verified for macOS.
iPhone
Are your predictions any good? Log what you expect with a probability, resolve it on the due date, and let your Brier score and calibration curve show the truth.
Calibrate is a forecasting journal for anyone who wants to make better decisions. Instead of trusting your gut, you write down what you think will happen, how confident you are, and when you'll know — then let the math tell you how good your judgment really is.
Inspired by superforecasting and the rationality community.
MAKE A PREDICTION
Write a clear question, set your probability from 1% to 99%, and pick a resolution date. Add notes and categories to keep things organized.
RESOLVE IT HONESTLY
When a prediction comes due, mark it true or false (or void it if the question no longer applies). Calibrate keeps you honest by separating what you predicted from what actually happened.
SEE YOUR BRIER SCORE
Your Brier score measures how accurate and well-calibrated your forecasts are — lower is better. Track it over time and watch it improve as you practice.
READ YOUR CALIBRATION CURVE
The calibration curve shows whether your 70% really happens about 70% of the time. Discover if you are overconfident or underconfident, and by how much.
STAY ON TOP OF WHAT'S DUE
Open, due, and resolved views make it easy to see what needs resolving and review your track record.
PRIVATE AND OFFLINE
No sign-in, no ads, no tracking, no network access. Everything stays on your device.
One simple purchase. No subscriptions.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Yoshifumi Sato, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Yoshifumi Sato
- Size
- 830.5 KB
- Category
- Productivity
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Calibrate
