# simalube CalPro vs Flatness

The clearest difference is update cadence: Flatness at every 16 months against simalube CalPro's every 48 months. simalube CalPro's advantage is iOS requirement (9.0 vs 12.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

simalube CalPro ships an update every 48 months, Flatness every 16 months. The most recent releases landed on September 19, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | simalube CalPro | Flatness |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/flatness/id6463624359/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 48 months | **Every 16 months** |
| Monetization | — | Free |
| Size | 1 MB | 61 MB |
| Requires iOS | **9.0** | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [biwac websolutions ag](https://appshunter.io/developer/567668974) | [ACOEM Group](https://appshunter.io/developer/1495816959) |

## What reviewers say

### simalube CalPro

[App page](https://appshunter.io/ios/app/simalube-calpro/id567668971)

**Features:** macOS Compatibility

**In-app purchases:** none


### Flatness

[App page](https://appshunter.io/ios/app/flatness/id6463624359)

This app facilitates precise rectangular flatness measurements for applications like motor and pump foundations. It guides users through the entire measurement and alignment process when connected to an AT-400 Ultimate with an M9 sensor via Bluetooth. Generate instant PDF reports of your findings directly on-site.

**Highlights:** Bluetooth connectivity, Icon-based adaptive user interface, 3D result views, Instant PDF report generation, Guided measurement process

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is simalube CalPro free?

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

### Is Flatness free?

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

### Do simalube CalPro or Flatness have ads?

Neither simalube CalPro nor Flatness shows ads.

### Which is updated more often, simalube CalPro or Flatness?

simalube CalPro ships an update every 48 months, and Flatness every 16 months. Most recently, simalube CalPro was updated on September 19, 2026 and Flatness on October 17, 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.*