# Bad Elf Flex vs Urban Tree Key

The clearest difference is rating: Urban Tree Key at 5.0 against Bad Elf Flex's 3.6. Urban Tree Key also leads on update cadence (every 2 days vs every 2 months). Bad Elf Flex's advantage is ratings volume (14 vs 2). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Urban Tree Key holds the better App Store score, 5.0 against 3.6. That said, the two scores are not equally well evidenced: Bad Elf Flex has 14 ratings behind it against 2, so its average is the more settled of the two.

Bad Elf Flex ships an update every 2 months, Urban Tree Key every 2 days. The most recent releases landed on October 26, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Bad Elf Flex | Urban Tree Key |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.6 (14 ratings)](https://appshunter.io/ios/app/bad-elf-flex/id1486378497/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/urban-tree-key/id6761633868/reviews)** |
| Number of ratings | **14** | 2 |
| Positive reviews | 40.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 days** |
| Monetization | Free | Free |
| Size | 33 MB | 64 MB |
| Requires iOS | 15.5 | **15.1** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Bad Elf, LLC.](https://appshunter.io/developer/391764721) | [Urban Forest Ecosystems Institute](https://appshunter.io/developer/1890545187) |

## 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


### Urban Tree Key

[App page](https://appshunter.io/ios/app/urban-tree-key/id6761633868)

Identify common urban tree species in California and the Western U.S. with this intuitive tool. It uses photos and simple questions about tree characteristics to guide you to the correct species, providing detailed information for each.

**Highlights:** Tree species identification, Photo-based guidance, Leaf and bark analysis, Detailed species information, Native range and care tips, Glossary of terms

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

**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 Urban Tree Key free?

Urban Tree Key is free to download, with no in-app purchases.

### Which has better reviews, Bad Elf Flex or Urban Tree Key?

Urban Tree Key is rated higher. Bad Elf Flex averages 3.6 out of 5 from 14 ratings, while Urban Tree Key averages 5.0 from 2 ratings.

### Do Bad Elf Flex or Urban Tree Key have ads?

Neither Bad Elf Flex nor Urban Tree Key shows ads.

### Which is updated more often, Bad Elf Flex or Urban Tree Key?

Bad Elf Flex ships an update every 2 months, and Urban Tree Key every 2 days. Most recently, Bad Elf Flex was updated on October 26, 2026 and Urban Tree Key on October 25, 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.*