# Biorhythm Plus vs Modbus TCP FieldKit

The clearest difference is price: Biorhythm Plus at Free against Modbus TCP FieldKit's $5.99. Biorhythm Plus also leads on iOS requirement (13.0 vs 18.0). Modbus TCP FieldKit's advantage is ads (none vs shown) and update cadence (weekly vs every 2 months). On in-app purchases and device support there is nothing between them.

Biorhythm Plus is free to download; Modbus TCP FieldKit costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Biorhythm Plus ships an update every 2 months, Modbus TCP FieldKit weekly. The most recent releases landed on November 11, 2026 and November 13, 2026 respectively.

## The numbers

| Metric | Biorhythm Plus | Modbus TCP FieldKit |
| --- | --- | --- |
| Price | **Free** | $5.99 |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Weekly** |
| Size | 24 MB | 13 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [DongHyeon Yun](https://appshunter.io/developer/1189875269) | [Vladimir Chemeris](https://appshunter.io/developer/1854526571) |

## What reviewers say

### Biorhythm Plus

[App page](https://appshunter.io/ios/app/biorhythm-plus/id1422386816)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 Biorhythm Plus free?

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

### Is Modbus TCP FieldKit free?

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

### Do Biorhythm Plus or Modbus TCP FieldKit have ads?

Biorhythm Plus shows ads; Modbus TCP FieldKit does not.

### Which is updated more often, Biorhythm Plus or Modbus TCP FieldKit?

Biorhythm Plus ships an update every 2 months, and Modbus TCP FieldKit weekly. Most recently, Biorhythm Plus was updated on November 11, 2026 and Modbus TCP FieldKit on November 13, 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.*