# FieldBus Toolkit vs Modbus TCP FieldKit

The clearest difference is price: FieldBus Toolkit at Free against Modbus TCP FieldKit's $5.99. FieldBus Toolkit also leads on iOS requirement (15.0 vs 18.0). Modbus TCP FieldKit's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support there is nothing between them.

FieldBus Toolkit is free to download; Modbus TCP FieldKit costs $5.99 up front. FieldBus Toolkit sells 1 one-off in-app purchase. Modbus TCP FieldKit asks for nothing beyond the download.

FieldBus Toolkit ships an update every 3 months, Modbus TCP FieldKit weekly. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | FieldBus Toolkit | Modbus TCP FieldKit |
| --- | --- | --- |
| Price | **Free** | $5.99 |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Weekly** |
| Size | 28 MB | 13 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [DONGSOO LEE](https://appshunter.io/developer/1868670088) | [Vladimir Chemeris](https://appshunter.io/developer/1854526571) |

## What reviewers say

### FieldBus Toolkit

[App page](https://appshunter.io/ios/app/fieldbus-toolkit/id6758210279)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


### Modbus TCP FieldKit

[App page](https://appshunter.io/ios/app/modbus-tcp-fieldkit/id6768897913)

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

**In-app purchases:** none


## Frequently asked questions

### Is FieldBus Toolkit free?

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

### Is Modbus TCP FieldKit free?

Modbus TCP FieldKit costs $5.99, with no in-app purchases.

### Do FieldBus Toolkit or Modbus TCP FieldKit have ads?

FieldBus Toolkit shows ads; Modbus TCP FieldKit does not.

### Which is updated more often, FieldBus Toolkit or Modbus TCP FieldKit?

FieldBus Toolkit ships an update every 3 months, and Modbus TCP FieldKit weekly. Most recently, FieldBus Toolkit was updated on October 24, 2026 and Modbus TCP FieldKit on October 28, 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.*