# ISO Fits vs 中联E家

The clearest difference is in-app purchases: 中联E家 at none against ISO Fits's 1. 中联E家 also leads on iOS requirement (11.0 vs 15.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. ISO Fits sells 1 one-off in-app purchase. 中联E家 asks for nothing beyond the download.

ISO Fits ships an update every 5 months, 中联E家 every 8 months. The most recent releases landed on October 16, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | ISO Fits | 中联E家 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (6 ratings)](https://appshunter.io/ios/app/iso-fits/id396863755/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 94.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 8 months |
| Monetization | Free with in-app purchases | — |
| Size | 66 MB | 111 MB |
| Requires iOS | 15.6 | **11.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Trelleborg Sealing Solutions](https://appshunter.io/developer/396863758) | [Zoomlion Heavy Industry Science and Technology Co., Ltd.](https://appshunter.io/developer/1042192738) |

## What reviewers say

### ISO Fits

[App page](https://appshunter.io/ios/app/iso-fits/id396863755)

Calculate ISO fits and tolerances for shafts and bores. Supports metric and inch units, displays detailed fit definitions, and includes visual charts and educational videos.

**Highlights:** ISO fits calculation, Tolerance class display, Metric/inch unit switching, Tolerance charts, Updated YouTube videos

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version with complete ISO286 Standard | $1.99 | one-time |


### 中联E家

[App page](https://appshunter.io/ios/app/e/id1660510039)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ISO Fits free?

ISO Fits is free to download, with in-app purchases available.

### Is 中联E家 free?

中联E家 is free to download, with no in-app purchases.

### Do ISO Fits or 中联E家 have ads?

Neither ISO Fits nor 中联E家 shows ads.

### Which is updated more often, ISO Fits or 中联E家?

ISO Fits ships an update every 5 months, and 中联E家 every 8 months. Most recently, ISO Fits was updated on October 16, 2026 and 中联E家 on October 5, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*