# do!bookⅡ vs CNC Troubleshooting

The clearest difference is update cadence: do!bookⅡ at every 2 months against CNC Troubleshooting's every 7 months. do!bookⅡ also leads on iOS requirement (9.0 vs 11.0). 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.

do!bookⅡ ships an update every 2 months, CNC Troubleshooting every 7 months. The most recent releases landed on October 1, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | do!bookⅡ | CNC Troubleshooting |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/cnc-troubleshooting/id1630009455/reviews)** |
| Number of ratings | — | **4** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 7 months |
| Monetization | — | Free |
| Size | 21 MB | 735 MB |
| Requires iOS | **9.0** | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Digital Office  Japan  Inc.](https://appshunter.io/developer/348581782) | [Ven Swaminathan](https://appshunter.io/developer/1630009457) |

## What reviewers say

### do!bookⅡ

[App page](https://appshunter.io/ios/app/dobook/id599472647)

**Features:** macOS Compatibility

**In-app purchases:** none


### CNC Troubleshooting

[App page](https://appshunter.io/ios/app/cnc-troubleshooting/id1630009455)

This app helps users troubleshoot CNC machines, PLCs, and robots with FANUC drives. It uses step-by-step flowcharts and YES/NO questions to identify faulty parts, saving on expensive service engineer visits. It supports FANUC and SIEMENS CNC machines, with more knowledge bases to be added.

**Highlights:** Step-by-step troubleshooting flowcharts, Alarm and symptom-based approaches, YES/NO question guidance, Text assistance for unsure answers, Maintenance and safety procedures, Support for FANUC and SIEMENS CNC machines

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is do!bookⅡ free?

do!bookⅡ is free to download, with no in-app purchases.

### Is CNC Troubleshooting free?

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

### Do do!bookⅡ or CNC Troubleshooting have ads?

Neither do!bookⅡ nor CNC Troubleshooting shows ads.

### Which is updated more often, do!bookⅡ or CNC Troubleshooting?

do!bookⅡ ships an update every 2 months, and CNC Troubleshooting every 7 months. Most recently, do!bookⅡ was updated on October 1, 2026 and CNC Troubleshooting on September 26, 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.*