# Prefix Dialer Pro vs Duoboard

The clearest difference is update cadence: Duoboard at daily against Prefix Dialer Pro's every 8 months. Prefix Dialer Pro's advantage is iOS requirement (17.0 vs 26.0). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Prefix Dialer Pro sells 2 one-off in-app purchases and Duoboard sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for Prefix Dialer Pro against 5.0 for Duoboard. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

Prefix Dialer Pro ships an update every 8 months, Duoboard daily. Both last shipped on November 13, 2026.

## The numbers

| Metric | Prefix Dialer Pro | Duoboard |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/prefix-dialer-pro/id982956788/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/duoboard-foldable-keyboard/id6826925959/reviews) |
| Number of ratings | 1 | **2** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Daily** |
| Monetization | Freemium | — |
| Size | 4 MB | 27 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [SOHO S & N](https://appshunter.io/developer/299975451) | [Patrick Gatewood](https://appshunter.io/developer/1602584895) |

## What reviewers say

### Prefix Dialer Pro

[App page](https://appshunter.io/ios/app/prefix-dialer-pro/id982956788)

Automatically add dial codes or modify phone numbers before making calls. Ideal for office PBX systems, international dialing, or any situation requiring number reformatting. Sync rules across devices via iCloud.

**Highlights:** Automatic prefix and replacer rules, Contact integration, Clipboard detection, Manual number entry, Dial history, iCloud sync, Shake to open contacts

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Additional Set of 5 Prefixes and 5 Replacers | $0.99 | one-time |
| Set of 5 prefixes and 5 replacers | $0.99 | one-time |


### Duoboard

[App page](https://appshunter.io/ios/app/duoboard-foldable-keyboard/id6826925959)

**Features:** iPhone Duo support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 7-Day Trial | Free | one-time |
| Duoboard Pro | $1.99 | one-time |


## Frequently asked questions

### Is Prefix Dialer Pro free?

Prefix Dialer Pro is free to download, with in-app purchases available.

### Is Duoboard free?

Duoboard is free to download, with in-app purchases available.

### Which has better reviews, Prefix Dialer Pro or Duoboard?

Prefix Dialer Pro and Duoboard are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.

### Do Prefix Dialer Pro or Duoboard have ads?

Neither Prefix Dialer Pro nor Duoboard shows ads.

### Which is updated more often, Prefix Dialer Pro or Duoboard?

Prefix Dialer Pro ships an update every 8 months, and Duoboard daily. Most recently, Prefix Dialer Pro was updated on November 13, 2026 and Duoboard on November 13, 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.*