# BlueLinker vs JSON Formatter Viewer

The clearest difference is in-app purchases: BlueLinker at none against JSON Formatter Viewer's 2. BlueLinker also leads on update cadence (every 3 days vs every 6 weeks). JSON Formatter Viewer's advantage is chart position (#199 vs unranked) and iOS requirement (17.0 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. JSON Formatter Viewer sells 2 in-app purchases, starting at $3.99 per 7 days. BlueLinker asks for nothing beyond the download.

BlueLinker ships an update every 3 days, JSON Formatter Viewer every 6 weeks. The most recent releases landed on October 7, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | BlueLinker | JSON Formatter Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 6 weeks |
| Monetization | Free | — |
| Best chart rank | — | **#199** |
| Size | 8 MB | 5 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [스튜디오일레븐](https://appshunter.io/developer/1853998639) | [Phuc Pham](https://appshunter.io/developer/1893081423) |

## What reviewers say

### BlueLinker

[App page](https://appshunter.io/ios/app/bluelinker/id6755450357)

This tool facilitates serial communication with Bluetooth-enabled microcontrollers like Arduino and Raspberry Pi. It offers automatic device scanning, real-time data transfer, and includes example code for LED control. Compatible with various popular development boards and BLE modules.

**Highlights:** Automatic BLE device scanning, Real-time serial communication (UART), LED control example code, Support for HM-10, ESP32, STM32, Connects to Arduino and Raspberry Pi

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

**In-app purchases:** none


### JSON Formatter Viewer

[App page](https://appshunter.io/ios/app/json-formatter-viewer/id6772269691)

**Currently charting:** #199 Top Grossing · Developer Tools (US App Store)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $3.99 | per 7 days |
| Yearly | $19.99 | per year |


## Frequently asked questions

### Is BlueLinker free?

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

### Is JSON Formatter Viewer free?

JSON Formatter Viewer is free to download, with in-app purchases available.

### Do BlueLinker or JSON Formatter Viewer have ads?

Neither BlueLinker nor JSON Formatter Viewer shows ads.

### Which is updated more often, BlueLinker or JSON Formatter Viewer?

BlueLinker ships an update every 3 days, and JSON Formatter Viewer every 6 weeks. Most recently, BlueLinker was updated on October 7, 2026 and JSON Formatter Viewer on October 3, 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.*