# Estimation & Decision Game PRO — Calibration Trainer Gauge

> Calibration Trainer Gauge (iPhone/iPad app by Aneesh Pradeep.)

- Source: https://appshunter.io/ios/app/estimation-and-decision-game-pro/id6787817317 (this page in markdown: same URL + `.md`)
- Developer: [Aneesh Pradeep](https://appshunter.io/developer/1836157821)
- Category: Education, Reference
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 4 MB
- Languages: American English
- Released: 2026-07-09
- Data updated: 2026-07-22
- User reviews in markdown: https://appshunter.io/ios/app/estimation-and-decision-game-pro/id6787817317/reviews.md

## What is Estimation & Decision Game PRO?

Most people who say they are "90 percent sure" are right only about half the time. GAUGE measures and trains the one skill almost nobody tracks: knowing what you don't know.

WHY YOU'LL LIKE IT (all free)
- Finally see what you don't know - GAUGE scores how well your confidence matches reality, then trains it.
- Find out if you are better calibrated than a frontier AI, right inside the free Lab.
- Private by design: on-device only, no account, no sign-up, no tracking, no ads.
- No timer, ever - GAUGE measures judgment, not speed.

FOUR WAYS TO ANSWER
- RANGE: give a 90 percent confidence interval.
- CLAIM: judge a statement true or false.
- OVER or UNDER: call it above or below.
- FERMI: estimate the order of magnitude on a log scale.

A TRANSPARENT GAUGE SCORE
- A published 0-100 score built on proper Brier scoring.
- Coverage, sharpness, and a clear letter grade.
- A "how it's scored" screen so nothing is a black box.

THE LAB (free)
- A calibration curve: your stated confidence versus your real accuracy versus the perfect diagonal.
- Overconfident points highlighted so you see exactly where you slip.
- Coverage versus your target, plus a by-domain breakdown.
- BASELINES that compare you to the roughly 52 percent human average and to a frontier AI.

DAILY TEN AND STREAKS
- The same ten questions worldwide, once a day.
- Build streaks and share a spoiler-free result grid.
- An activity heat map, active days, longest streak, and best grade.

FREE AI TOUCHES
- A short AI micro-insight after each set.
- On-demand "why" context on any answer.
- Every reveal shows the truth with its source - a micro-lesson each time.

PRIVACY
- On-device only: no account, no login, no tracking, no ads, no ad identifier.
- For the AI touches, only anonymized aggregate statistics are sent to a third-party AI provider - never your identity, device identifiers, or raw per-answer logs.
- Export your record as CSV or delete everything anytime.

BUILT FOR IPHONE AND IPAD
- Universal app with a warm-paper light theme and a dark terminal theme.
- Clean monospace aesthetic.

For anyone who loves trivia and quizzes but wants something smarter, and for forecasters and fans of decision-making, probability, rationality, cognitive bias, mental models, and self-improvement.

Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| 1 Deep Dive | $2.99 | one-time |
| 3 Deep Dives | $6.99 | one-time |
| 10 Deep Dives | $19.99 | one-time |



## Version history (last 2 releases)

### 4 — 2026-07-10

Improved Performance

### 1.0 — 2026-07-09

No release notes.

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All apps by Aneesh Pradeep: https://appshunter.io/developer/1836157821

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-22.*