# HIDDEN GEMS - Calefax — Musical treasure hunt

> Musical treasure hunt (iPhone/iPad app by Echoes.xyz.)

- Source: https://appshunter.io/ios/app/hidden-gems-calefax/id1359856229 (this page in markdown: same URL + `.md`)
- Developer: [Echoes.xyz](https://appshunter.io/developer/1053801898)
- Category: Entertainment, Music
- Price: Free
- Age rating: 4+
- Requires: iOS 11.0 · 115 MB
- Languages: American English
- Released: 2018-04-02
- Data updated: 2026-06-01
- User reviews in markdown: https://appshunter.io/ios/app/hidden-gems-calefax/id1359856229/reviews.md

## What is HIDDEN GEMS?

Beauty can be found in unexpected places. Calefax will take you on a musical tour around your favorite city. Let the music be your guide and experience a magical trip full of secret meetings, personal memories and unexpected moments. 

The Hidden Gems app offers GPS-triggered audio tours. To use the app you’ll need to turn on Location Services / GPS on your smartphone and plug in your headphones.

Tours are now available in five cities in The Netherlands: Amsterdam, Rotterdam, Utrecht, Nijmegen and Groningen. Dutch and English spoken versions are available.
More tours in different countries will be added in the near future! 

At the end of each tour, an actual treasure is hidden. Can you find it? There will be a nice surprise waiting for you.

Will you join our treasure hunt?


## Version history (last 3 releases)

### 6.0.0 — 2020-06-25

Updates the app to work with the latest versions of iOS

### 1.1 — 2018-04-05

Will you join our treasure hunt?
More cities in other countries will be added in the near future!

We've updated help and about text in the screens, and made the experience even better with no stopping playback when you rotate the device.

### 1.0 — 2018-04-02

No release notes.

## Apps similar to HIDDEN GEMS

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Annoying Ringtones +](https://appshunter.io/ios/app/annoying-ringtones-plus/id981227961) | 4.4 (241) | Free | Entertainment |
| [MooveXR](https://appshunter.io/ios/app/moovexr/id6447889626) | — | Free | Entertainment |
| [Voicy: Meme Soundboard & SFX](https://appshunter.io/ios/app/voicy-meme-soundboard-and-sfx/id1632396841) | 4.7 (231) | Free | Entertainment |
| [Distortion Festival](https://appshunter.io/ios/app/distortion-festival/id1671396156) | — | Free | Entertainment |
| [Scratch Art Paper - Doodle It](https://appshunter.io/ios/app/scratch-art-paper-doodle-it/id1583528825) | 4.5 (101) | Free | Entertainment |
| [Animated Christmas Emojis](https://appshunter.io/ios/app/animated-christmas-emojis/id1318213503) | 2.7 (19) | Free | Entertainment |

## More apps by Echoes.xyz

- [ECHOES interactive sound walks](https://appshunter.io/ios/app/echoes-interactive-sound-walks/id1021511722)
- [Le Strassbuch](https://appshunter.io/ios/app/le-strassbuch/id1153577192)
- [Lewes Castle](https://appshunter.io/ios/app/lewes-castle/id1189050590)
- [SOUNDwalker](https://appshunter.io/ios/app/soundwalker/id1350764700)
- [VUMA soner](https://appshunter.io/ios/app/vuma-soner/id1499081532)

All apps by Echoes.xyz: https://appshunter.io/developer/1053801898

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-01.*