# LineKeeper vs Modbus 40001

The clearest difference is in-app purchases: Modbus 40001 at none against LineKeeper's 1. LineKeeper's advantage is update cadence (every 4 days vs every 5 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. LineKeeper sells 1 one-off in-app purchase. Modbus 40001 asks for nothing beyond the download.

LineKeeper ships an update every 4 days, Modbus 40001 every 5 weeks. The most recent releases landed on October 4, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | LineKeeper | Modbus 40001 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 5 weeks |
| Size | 19 MB | 58 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Oleksandr Makarov](https://appshunter.io/developer/6791371576) | [PHILIP JULIAN ROBINSON](https://appshunter.io/developer/1865579763) |

## What reviewers say

### LineKeeper

[App page](https://appshunter.io/ios/app/linekeeper/id6791371574)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Write Unlock | $59.99 | one-time |


### Modbus 40001

[App page](https://appshunter.io/ios/app/modbus-40001/id6799202584)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is LineKeeper free?

LineKeeper is free to download, with in-app purchases available.

### Is Modbus 40001 free?

Modbus 40001 is free to download, with no in-app purchases.

### Do LineKeeper or Modbus 40001 have ads?

Neither LineKeeper nor Modbus 40001 shows ads.

### Which is updated more often, LineKeeper or Modbus 40001?

LineKeeper ships an update every 4 days, and Modbus 40001 every 5 weeks. Most recently, LineKeeper was updated on October 4, 2026 and Modbus 40001 on October 16, 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.*