# FRB FlatrateBooster vs Dunas

The clearest difference is update cadence: Dunas at every 8 days against FRB FlatrateBooster's monthly. FRB FlatrateBooster's advantage is iOS requirement (15.5 vs 17.0). 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.

FRB FlatrateBooster ships an update monthly, Dunas every 8 days. The most recent releases landed on October 7, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | FRB FlatrateBooster | Dunas |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 8 days** |
| Monetization | Free | — |
| Size | 10 MB | 42 MB |
| Requires iOS | **15.5** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [DALASON GmbH](https://appshunter.io/developer/531312222) | [Dunas Desenvolvimento de Software Ltda](https://appshunter.io/developer/1881126046) |

## What reviewers say

### FRB FlatrateBooster

[App page](https://appshunter.io/ios/app/frb-flatratebooster/id531312219)

Make ultra-low-cost international calls and save on calls to German mobile numbers. This app routes calls via landline or freephone numbers, offering up to 99% savings. It provides cost control, uses your existing contacts, and ensures superb voice quality without internet calls.

**Highlights:** Ultra low-priced international calls, Savings on German mobile numbers, Routes calls via landline/freephone, Up to 99% savings, 1 EUR free credit for trial, No monthly fees or subscriptions, Superb voice quality

**Features:** macOS Compatibility

**In-app purchases:** none


### Dunas

[App page](https://appshunter.io/ios/app/dunas/id6759843845)

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

**In-app purchases:** none


## Frequently asked questions

### Is FRB FlatrateBooster free?

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

### Is Dunas free?

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

### Do FRB FlatrateBooster or Dunas have ads?

Neither FRB FlatrateBooster nor Dunas shows ads.

### Which is updated more often, FRB FlatrateBooster or Dunas?

FRB FlatrateBooster ships an update monthly, and Dunas every 8 days. Most recently, FRB FlatrateBooster was updated on October 7, 2026 and Dunas 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.*