# ISO Fits vs FEATUREgrip

The clearest difference is in-app purchases: FEATUREgrip at none against ISO Fits's 1. ISO Fits's advantage is update cadence (every 5 months vs every 23 months). On price, ads, device support and iOS requirement there is nothing between them.

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

ISO Fits ships an update every 5 months, FEATUREgrip every 23 months. The most recent releases landed on September 12, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | ISO Fits | FEATUREgrip |
| --- | --- | --- |
| 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 23 months |
| Monetization | Free with in-app purchases | — |
| Size | 66 MB | 22 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Trelleborg Sealing Solutions](https://appshunter.io/developer/396863758) | [Heinrich Kipp Werk KG](https://appshunter.io/developer/639520721) |

## 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 |


### FEATUREgrip

[App page](https://appshunter.io/ios/app/featuregrip/id6477911999)

**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 FEATUREgrip free?

FEATUREgrip is free to download, with no in-app purchases.

### Do ISO Fits or FEATUREgrip have ads?

Neither ISO Fits nor FEATUREgrip shows ads.

### Which is updated more often, ISO Fits or FEATUREgrip?

ISO Fits ships an update every 5 months, and FEATUREgrip every 23 months. Most recently, ISO Fits was updated on September 12, 2026 and FEATUREgrip on September 17, 2026.

---

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