# TD UC System Interface vs Flatness

The clearest difference is rating: Flatness at 5.0 against TD UC System Interface's 4.0. TD UC System Interface's advantage is update cadence (every 3 months vs every 16 months) and iOS requirement (9.0 vs 12.0). On price, ratings volume, ads and in-app purchases there is nothing between them.

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

Flatness holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

TD UC System Interface ships an update every 3 months, Flatness every 16 months. The most recent releases landed on September 18, 2026 and June 10, 2026 respectively.

## The numbers

| Metric | TD UC System Interface | Flatness |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/td-uc-system-interface/id1599254238/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/flatness/id6463624359/reviews)** |
| Number of ratings | 1 | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 16 months |
| Monetization | Free | Free |
| Size | 60 MB | 61 MB |
| Requires iOS | **9.0** | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ESAB Group Inc](https://appshunter.io/developer/1053463271) | [ACOEM Group](https://appshunter.io/developer/1495816959) |

## What reviewers say

### TD UC System Interface

[App page](https://appshunter.io/ios/app/td-uc-system-interface/id1599254238)

Monitor and control ESAB iSERIES Plasma Power Supplies in real-time. Add welding machine details and adjust power supply parameters directly from your mobile device.

**Highlights:** Real-time monitoring, Parameter control, Add welding machine details, View power supply parameters, Mobile device control

**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 TD UC System Interface free?

TD UC System Interface is free to download, with no in-app purchases.

### Is Flatness free?

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

### Which has better reviews, TD UC System Interface or Flatness?

Flatness is rated higher. TD UC System Interface averages 4.0 out of 5 from 1 ratings, while Flatness averages 5.0 from 1 ratings.

### Do TD UC System Interface or Flatness have ads?

Neither TD UC System Interface nor Flatness shows ads.

### Which is updated more often, TD UC System Interface or Flatness?

TD UC System Interface ships an update every 3 months, and Flatness every 16 months. Most recently, TD UC System Interface was updated on September 18, 2026 and Flatness on June 10, 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.*