# Build CLS vs Sim Vitals

The clearest difference is in-app purchases: Build CLS at none against Sim Vitals's 4. Sim Vitals's advantage is update cadence (every 9 months vs every 19 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Sim Vitals sells 4 in-app purchases, starting at $0.99 per month. Build CLS asks for nothing beyond the download.

Build CLS ships an update every 19 months, Sim Vitals every 9 months. The most recent releases landed on September 13, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Build CLS | Sim Vitals |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 19 months | **Every 9 months** |
| Size | 17 MB | 68 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Clinical Leadership Solutions LTD](https://appshunter.io/developer/1434082548) | [Benmed Technologies Limited](https://appshunter.io/developer/1588959872) |

## What reviewers say

### Build CLS

[App page](https://appshunter.io/ios/app/build-cls/id1439136458)

**In-app purchases:** none


### Sim Vitals

[App page](https://appshunter.io/ios/app/sim-vitals/id1659299574)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sim Vitals | $0.99 | per month |
| 3 Monthly | $1.99 | per 3 months |
| Annual Subscription | $4.99 | per year |
| Lifetime Access | $7.99 | one-time |


## Frequently asked questions

### Is Build CLS free?

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

### Is Sim Vitals free?

Sim Vitals is free to download, with in-app purchases available.

### Do Build CLS or Sim Vitals have ads?

Neither Build CLS nor Sim Vitals shows ads.

### Which is updated more often, Build CLS or Sim Vitals?

Build CLS ships an update every 19 months, and Sim Vitals every 9 months. Most recently, Build CLS was updated on September 13, 2026 and Sim Vitals on September 19, 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.*