# A3 Coach: Problem Solving — Think on one page

> Think on one page (iPhone/iPad app by Jeroen van Koesveld.)

- Source: https://appshunter.io/ios/app/a3-coach-problem-solving/id6795834307 (this page in markdown: same URL + `.md`)
- Developer: [Jeroen van Koesveld](https://appshunter.io/developer/6795553090)
- Category: Business, Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English
- Released: 2026-08-07
- Data updated: 2026-08-31
- User reviews in markdown: https://appshunter.io/ios/app/a3-coach-problem-solving/id6795834307/reviews.md

## What is A3 Coach?

The A3 is the most copied and least understood tool in lean: one page that carries a whole way of thinking. A3 Coach walks you through it the way a good mentor would — one question at a time.

Background. Current condition. Goal. Root-cause analysis. Countermeasures. Plan. Follow-up. At every step the app asks the coaching questions that keep you honest.

— Guided wizard through the full A3 storyline
— Coaching prompts at every section
— Export as a clean, printable one-page PDF
— Offline, no account, no tracking


## Version history (last 1 release)

### 1.0 — 2026-08-07

No release notes.

## More apps by Jeroen van Koesveld

- [BeltUp: Lean Six Sigma Prep](https://appshunter.io/ios/app/beltup-lean-six-sigma-prep/id6795830679)
- [Ploegwerk: Shift Pay Check](https://appshunter.io/ios/app/ploegwerk-shift-pay-check/id6795833352)
- [Treinrecht: Rail Refunds](https://appshunter.io/ios/app/treinrecht-rail-refunds/id6795833634)
- [Huddle: Daily Team Board](https://appshunter.io/ios/app/huddle-daily-team-board/id6795833803)
- [TAKT: The Flow Puzzle](https://appshunter.io/ios/app/takt-the-flow-puzzle/id6795835164)

All apps by Jeroen van Koesveld: https://appshunter.io/developer/6795553090

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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 2026-08-31.*