# DMARC Checker vs Modbus TCP FieldKit

The clearest difference is price: DMARC Checker at Free against Modbus TCP FieldKit's $4.99. DMARC Checker also leads on update cadence (every 2 days vs every 3 weeks) and iOS requirement (12.0 vs 18.0). Modbus TCP FieldKit's advantage is ads (none vs shown). On in-app purchases and device support there is nothing between them.

DMARC Checker is free to download; Modbus TCP FieldKit costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

DMARC Checker ships an update every 2 days, Modbus TCP FieldKit every 3 weeks. The most recent releases landed on May 18, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | DMARC Checker | Modbus TCP FieldKit |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 2 days** | Every 3 weeks |
| Size | 30 MB | 11 MB |
| Requires iOS | **12.0** | 18.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Freex Ltd.](https://appshunter.io/developer/1375283830) | [Vladimir Chemeris](https://appshunter.io/developer/1854526571) |

## What reviewers say

### DMARC Checker

[App page](https://appshunter.io/ios/app/dmarc-checker/id6751012259)

**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 DMARC Checker free?

DMARC Checker is free to download, with no in-app purchases.

### Is Modbus TCP FieldKit free?

Modbus TCP FieldKit costs $4.99, with no in-app purchases.

### Do DMARC Checker or Modbus TCP FieldKit have ads?

DMARC Checker shows ads; Modbus TCP FieldKit does not.

### Which is updated more often, DMARC Checker or Modbus TCP FieldKit?

DMARC Checker ships an update every 2 days, and Modbus TCP FieldKit every 3 weeks. Most recently, DMARC Checker was updated on May 18, 2026 and Modbus TCP FieldKit on September 17, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*