# Dowsing vs isPrime?

The clearest difference is ads: isPrime? at none against Dowsing's shown. isPrime? also leads on update cadence (daily vs every 3 days). On price, in-app purchases, device support and iOS requirement there is nothing between them.

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

Dowsing ships an update every 3 days, isPrime? daily. The most recent releases landed on September 19, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Dowsing | isPrime? |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/dowsing/id6451499677/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 3 days | **Daily** |
| Monetization | Ad-supported | — |
| Size | 18 MB | 0 MB |
| Requires iOS | 16.1 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Trey Tuscai](https://appshunter.io/developer/1698590571) | [Omer Faruk Mesebuken](https://appshunter.io/developer/1655501999) |

## What reviewers say

### Dowsing

[App page](https://appshunter.io/ios/app/dowsing/id6451499677)

Discover and rate drinking fountains with this community-driven app. Find nearby fountains, share photos, and read reviews to stay hydrated on the go. Save your favorites and connect with other users.

**Highlights:** Drinking fountain locator map, User ratings and reviews, Photo sharing, Favorite fountains list, Community interaction and comments, Submit new fountain suggestions, Limited offline access

**Features:** macOS Compatibility

**In-app purchases:** none


### isPrime?

[App page](https://appshunter.io/ios/app/isprime/id6478832061)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Dowsing free?

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

### Is isPrime? free?

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

### Do Dowsing or isPrime? have ads?

Dowsing shows ads; isPrime? does not.

### Which is updated more often, Dowsing or isPrime??

Dowsing ships an update every 3 days, and isPrime? daily. Most recently, Dowsing was updated on September 19, 2026 and isPrime? on September 20, 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.*