# Tolerance Master — Based on ISO 286 standards.

> Based on ISO 286 standards. (iPhone/iPad app by 磊 高.)

- Source: https://appshunter.io/ios/app/tolerance-master/id6759722609 (this page in markdown: same URL + `.md`)
- Developer: [磊 高](https://appshunter.io/developer/1879509033)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 2 MB
- Languages: American English, Chinese (Simplified, China)
- Released: 2026-03-26
- Data updated: 2026-09-08
- User reviews in markdown: https://appshunter.io/ios/app/tolerance-master/id6759722609/reviews.md

## What is Tolerance Master?

Tolerance Master is a professional-grade mechanical tolerance calculator based on GB/T 1800 and ISO 286 standards. Its core features include: real-time tolerance lookup with instant results for any basic size, dynamic tolerance zone visualization that clearly displays fit types (clearance, interference, transition), comprehensive offline database covering the full 0-3150mm size range, and support for both hole and shaft tolerance calculations. The app features a user-friendly interface with intuitive controls, allowing engineers to quickly input dimensions and select tolerance grades. It also provides detailed results including upper/lower deviations, fit type determination, and standard compliance information. With no internet connection required, Tolerance Master is ready whenever and wherever you need it – in the office, on the workshop floor, or during field inspections. Whether you're a seasoned professional or engineering student, this tool simplifies complex tolerance calculations and ensures every design meets industry standards.

Get a 3-day free trial, subscribe when it ends.

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

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Pro Version | $0.99 | per month |



## Version history (last 1 release)

### 1.0 — 2026-03-26

No release notes.

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All apps by 磊 高: https://appshunter.io/developer/1879509033

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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 2026-09-08.*