# S7 Link vs Modbus TCP Station

The clearest difference is price: Modbus TCP Station at Free against S7 Link's $14.99. Modbus TCP Station also leads on update cadence (every 10 days vs every 4 months) and iOS requirement (15.0 vs 26.0). S7 Link's advantage is ads (none vs shown). On in-app purchases and device support there is nothing between them.

Modbus TCP Station is free to download; S7 Link costs $14.99 up front. S7 Link sells 3 one-off in-app purchases and Modbus TCP Station sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

S7 Link ships an update every 4 months, Modbus TCP Station every 10 days. The most recent releases landed on November 10, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | S7 Link | Modbus TCP Station |
| --- | --- | --- |
| Price | $14.99 | **Free** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 10 days** |
| Size | 10 MB | 31 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Carlo Trotti](https://appshunter.io/developer/594070838) | [DONGSOO LEE](https://appshunter.io/developer/1868670088) |

## What reviewers say

### S7 Link

[App page](https://appshunter.io/ios/app/s7-link/id594070835)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Alarms | $2.99 | one-time |
| Charts | $2.99 | one-time |
| OPC Client | $4.99 | one-time |


### Modbus TCP Station

[App page](https://appshunter.io/ios/app/modbus-tcp-station/id6757790321)

**Features:** macOS Compatibility, iPhone Duo support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1-Month Premium Pass | $0.99 | one-time |
| Premium Upgrade | $9.99 | one-time |


## Frequently asked questions

### Is S7 Link free?

S7 Link costs $14.99, and also offers in-app purchases.

### Is Modbus TCP Station free?

Modbus TCP Station is free to download, with in-app purchases available.

### Do S7 Link or Modbus TCP Station have ads?

Modbus TCP Station shows ads; S7 Link does not.

### Which is updated more often, S7 Link or Modbus TCP Station?

S7 Link ships an update every 4 months, and Modbus TCP Station every 10 days. Most recently, S7 Link was updated on November 10, 2026 and Modbus TCP Station on November 2, 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.*