# Modbus TCP Pro vs Curly

The clearest difference is price: Curly at Free against Modbus TCP Pro's $11.99. Curly also leads on in-app purchases (none vs 1) and update cadence (every 2 days vs every 5 weeks). On review sentiment, ads, monetization model and device support there is nothing between them.

Curly is free to download; Modbus TCP Pro costs $11.99 up front. Modbus TCP Pro sells 1 one-off in-app purchase. Curly asks for nothing beyond the download.

Modbus TCP Pro ships an update every 5 weeks, Curly every 2 days. The most recent releases landed on October 15, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Modbus TCP Pro | Curly |
| --- | --- | --- |
| Price | $11.99 | **Free** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 2 days** |
| Monetization | Free | Free |
| Size | 2 MB | 5 MB |
| Requires iOS | 26.1 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Bernard Struelens](https://appshunter.io/developer/1802500832) | [Artem Sharifullin](https://appshunter.io/developer/1877544384) |

## What reviewers say

### Modbus TCP Pro

[App page](https://appshunter.io/ios/app/modbus-tcp-pro/id6756293575)

This tool allows professionals to test, read, and write Modbus registers directly from their iPhone. It offers robust connectivity and support for various data types, making it ideal for field testing and debugging industrial control systems.

**Highlights:** Modbus TCP connectivity, Read and write registers, Support for multiple data types, Configurable Unit ID, Instant feedback and error reporting, Designed for testing and debugging, Field testing without a laptop

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Modbus Pro | $24.99 | one-time |


### Curly

[App page](https://appshunter.io/ios/app/curly-rest-api-client/id6759227355)

A native REST API client for iOS and iPad, designed for developers to test and debug APIs efficiently. It supports various request methods, response inspection with syntax highlighting, and collection organization.

**Highlights:** Send GET, POST, PUT, PATCH, DELETE requests, Edit query params, headers, auth, and request body, JSON syntax highlighting for responses, Organize endpoints into collections, Import Postman and Bruno collections, Environment variables with autocomplete, Pre-request and post-response scripts

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

**In-app purchases:** none


## Frequently asked questions

### Is Modbus TCP Pro free?

Modbus TCP Pro costs $11.99, and also offers in-app purchases.

### Is Curly free?

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

### Do Modbus TCP Pro or Curly have ads?

Neither Modbus TCP Pro nor Curly shows ads.

### Which is updated more often, Modbus TCP Pro or Curly?

Modbus TCP Pro ships an update every 5 weeks, and Curly every 2 days. Most recently, Modbus TCP Pro was updated on October 15, 2026 and Curly on October 3, 2026.

---

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