# ISO Fits vs VS Watch

The clearest difference is rating: VS Watch at 5.0 against ISO Fits's 4.2. VS Watch also leads on in-app purchases (none vs 1) and update cadence (every 2 days vs every 5 months). ISO Fits's advantage is ratings volume (6 vs 2). On price, ads and device support there is nothing between them.

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

VS Watch holds the better App Store score, 5.0 against 4.2. Both are backed by a comparable volume of ratings — 6 and 2 respectively.

ISO Fits ships an update every 5 months, VS Watch every 2 days. The most recent releases landed on October 16, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | ISO Fits | VS Watch |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (6 ratings)](https://appshunter.io/ios/app/iso-fits/id396863755/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/vs-watch/id1492942490/reviews)** |
| Number of ratings | **6** | 2 |
| Positive reviews | 94.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 66 MB | 2 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPod, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Trelleborg Sealing Solutions](https://appshunter.io/developer/396863758) | [Verisurf](https://appshunter.io/developer/468050982) |

## 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 |


### VS Watch

[App page](https://appshunter.io/ios/app/vs-watch/id1492942490)

Stream Build DRO data directly to your iOS watch. This app offers level mode for zeroing out the DRO and allows switching between average/continuous trigger types. Advanced settings are accessible via the login screen.

**Highlights:** Direct connection to Build DRO, Stream data to iOS watch, Level Mode for zeroing DRO, Switch trigger types (Average/Continuous), Access advanced settings

**In-app purchases:** none


## Frequently asked questions

### Is ISO Fits free?

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

### Is VS Watch free?

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

### Which has better reviews, ISO Fits or VS Watch?

VS Watch is rated higher. ISO Fits averages 4.2 out of 5 from 6 ratings, while VS Watch averages 5.0 from 2 ratings.

### Do ISO Fits or VS Watch have ads?

Neither ISO Fits nor VS Watch shows ads.

### Which is updated more often, ISO Fits or VS Watch?

ISO Fits ships an update every 5 months, and VS Watch every 2 days. Most recently, ISO Fits was updated on October 16, 2026 and VS Watch on October 6, 2026.

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