# DNS Mail Info vs Modbus TCP FieldKit

The clearest difference is price: DNS Mail Info at Free against Modbus TCP FieldKit's $4.99. DNS Mail Info also leads on update cadence (every 2 days vs every 3 weeks). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

DNS Mail Info 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.

DNS Mail Info ships an update every 2 days, Modbus TCP FieldKit every 3 weeks. The most recent releases landed on September 14, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | DNS Mail Info | Modbus TCP FieldKit |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 3 weeks |
| Size | 3 MB | 11 MB |
| Requires iOS | 18.0 | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [BEHR Consulting International](https://appshunter.io/developer/385816833) | [Vladimir Chemeris](https://appshunter.io/developer/1854526571) |

## What reviewers say

### DNS Mail Info

[App page](https://appshunter.io/ios/app/dns-mail-info/id6484502460)

**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 DNS Mail Info free?

DNS Mail Info 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 DNS Mail Info or Modbus TCP FieldKit have ads?

Neither DNS Mail Info nor Modbus TCP FieldKit shows ads.

### Which is updated more often, DNS Mail Info or Modbus TCP FieldKit?

DNS Mail Info ships an update every 2 days, and Modbus TCP FieldKit every 3 weeks. Most recently, DNS Mail Info was updated on September 14, 2026 and Modbus TCP FieldKit on September 17, 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.*