# Prefix Dialer Pro vs Stop Spam

The clearest difference is ads: Prefix Dialer Pro at none against Stop Spam's shown. Stop Spam's advantage is update cadence (fortnightly vs every 8 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Prefix Dialer Pro sells 2 one-off in-app purchases and Stop Spam sells 4 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Prefix Dialer Pro ships an update every 8 months, Stop Spam fortnightly. The most recent releases landed on November 6, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Prefix Dialer Pro | Stop Spam |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/prefix-dialer-pro/id982956788/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 8 months | **Fortnightly** |
| Monetization | Freemium | — |
| Size | 4 MB | 21 MB |
| Requires iOS | **17.0** | 18 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [SOHO S & N](https://appshunter.io/developer/299975451) | [Serhii Laptii](https://appshunter.io/developer/1802659635) |

## 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 |


### Stop Spam

[App page](https://appshunter.io/ios/app/stop-spam-call-blocker/id6743408195)

**Features:** Family Sharing

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stop Spam Premium | $4.99 | per month |
| Stop Spam Premium | $7.99 | per 3 months |
| Stop Spam Family Plan | $12.99 | per month |
| Stop Spam Premium | $24.99 | per year |


## Frequently asked questions

### Is Prefix Dialer Pro free?

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

### Is Stop Spam free?

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

### Do Prefix Dialer Pro or Stop Spam have ads?

Stop Spam shows ads; Prefix Dialer Pro does not.

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

Prefix Dialer Pro ships an update every 8 months, and Stop Spam fortnightly. Most recently, Prefix Dialer Pro was updated on November 6, 2026 and Stop Spam on October 30, 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.*