# TPC vs STS

The clearest difference is iOS requirement: STS at 13.2 against TPC's 15.0. On price, update cadence, 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.

TPC ships an update every 3 weeks, STS every 2 weeks. The most recent releases landed on October 13, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | TPC | STS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/tpc-app/id515660651/reviews)** | — |
| Number of ratings | **4** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 268 MB | 12 MB |
| Requires iOS | 15.0 | **13.2** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [BabEng GmbH](https://appshunter.io/developer/515660654) | [中铁工程装备集团有限公司](https://appshunter.io/developer/1447605449) |

## What reviewers say

### TPC

[App page](https://appshunter.io/ios/app/tpc-app/id515660651)

This application provides real-time monitoring and optimization for mechanized tunnelling processes. It offers extensive resources and options for detailed analysis, including key performance indicators and failure messages.

**Highlights:** Realtime Key Performance Indicators, Realtime TBM Failure Messages, Statistics, Geotechnical Measurements, GIS, Segment Tracker

**Features:** Vision Pro support

**In-app purchases:** none


### STS

[App page](https://appshunter.io/ios/app/sts-mobile/id1538528756)

**In-app purchases:** none


## Frequently asked questions

### Is TPC free?

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

### Is STS free?

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

### Do TPC or STS have ads?

Neither TPC nor STS shows ads.

### Which is updated more often, TPC or STS?

TPC ships an update every 3 weeks, and STS every 2 weeks. Most recently, TPC was updated on October 13, 2026 and STS on October 18, 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.*