# Bad Elf Flex vs BluetoothLE RTK

The clearest difference is update cadence: BluetoothLE RTK at every 2 weeks against Bad Elf Flex's every 3 months. BluetoothLE RTK also leads on iOS requirement (12.4 vs 15.5). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Bad Elf Flex ships an update every 3 months, BluetoothLE RTK every 2 weeks. The most recent releases landed on September 9, 2026 and May 14, 2026 respectively.

## The numbers

| Metric | Bad Elf Flex | BluetoothLE RTK |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.6 (14 ratings)](https://appshunter.io/ios/app/bad-elf-flex/id1486378497/reviews)** | — |
| Number of ratings | **14** | — |
| Positive reviews | 40.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 32 MB | 13 MB |
| Requires iOS | 15.5 | **12.4** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Bad Elf, LLC.](https://appshunter.io/developer/391764721) | [Navisys Technology Corp.](https://appshunter.io/developer/954176603) |

## What reviewers say

### Bad Elf Flex

[App page](https://appshunter.io/ios/app/bad-elf-flex/id1486378497)

This utility app enhances the functionality of Bad Elf Flex and Flex Mini GNSS receivers. It allows users to monitor hardware health, adjust settings, and update firmware. For the Flex model, it also enables the purchase and application of tokens for advanced features and correction sources like SBAS and RTK.

**Highlights:** Monitor GNSS receiver health, Change hardware settings, Perform firmware updates, Purchase and load Flex Tokens, Enable hardware-based features, Access correction sources

**Features:** Vision Pro support

**In-app purchases:** none


### BluetoothLE RTK

[App page](https://appshunter.io/ios/app/bluetoothle-rtk/id1599429026)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Bad Elf Flex free?

Bad Elf Flex is free to download, with no in-app purchases.

### Is BluetoothLE RTK free?

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

### Do Bad Elf Flex or BluetoothLE RTK have ads?

Neither Bad Elf Flex nor BluetoothLE RTK shows ads.

### Which is updated more often, Bad Elf Flex or BluetoothLE RTK?

Bad Elf Flex ships an update every 3 months, and BluetoothLE RTK every 2 weeks. Most recently, Bad Elf Flex was updated on September 9, 2026 and BluetoothLE RTK on May 14, 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.*