# C6协同v3.9 vs Machining Assistant

The clearest difference is price: C6协同v3.9 at Free against Machining Assistant's $0.99. C6协同v3.9 also leads on update cadence (every 3 weeks vs every 5 weeks) and iOS requirement (7.0 vs 16.6). On ads, in-app purchases and device support there is nothing between them.

C6协同v3.9 is free to download; Machining Assistant costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

C6协同v3.9 ships an update every 3 weeks, Machining Assistant every 5 weeks. The most recent releases landed on September 17, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | C6协同v3.9 | Machining Assistant |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 5 weeks |
| Monetization | — | Paid |
| Size | 21 MB | 8 MB |
| Requires iOS | **7.0** | 16.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [BEIJING JINHER SOFTWARE CO.LTD.](https://appshunter.io/developer/473901494) | [小燕 陈](https://appshunter.io/developer/1462872555) |

## What reviewers say

### C6协同v3.9

[App page](https://appshunter.io/ios/app/c6v39/id1173412813)

**Features:** macOS Compatibility

**In-app purchases:** none


### Machining Assistant

[App page](https://appshunter.io/ios/app/machining-assistant/id6766735667)

This tool simplifies complex machining calculations for engineers and technicians. It offers features for cutting parameters, material weight, tolerance and fit analysis, and thread data. Designed for efficiency and accuracy, it works offline and provides a user-friendly interface.

**Highlights:** Cutting parameter calculation, Material weight and volume, Tolerance and fit analysis, Thread data and formulas, Offline functionality, Material database

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is C6协同v3.9 free?

C6协同v3.9 is free to download, with no in-app purchases.

### Is Machining Assistant free?

Machining Assistant costs $0.99, with no in-app purchases.

### Do C6协同v3.9 or Machining Assistant have ads?

Neither C6协同v3.9 nor Machining Assistant shows ads.

### Which is updated more often, C6协同v3.9 or Machining Assistant?

C6协同v3.9 ships an update every 3 weeks, and Machining Assistant every 5 weeks. Most recently, C6协同v3.9 was updated on September 17, 2026 and Machining Assistant on September 21, 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.*