Comparison

Prefix Dialer Pro vs Stop Spam

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Prefix Dialer Pro

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
Read full description

Prefix Dialer Pro lets you automatically prepend dial codes and transform phone numbers before placing a call — perfect for office PBX systems, international dialling, or any setup where numbers need a prefix. HOW IT WORKS Set up one or more prefix rules (e.g. "00" or "9") and replacer rules (e.g. strip the leading "+"). When you dial a number from your contacts, clipboard, or manually, every enabled rule is applied automatically. FEATURES • Contacts — pick any phone number directly from your contacts • Clipboard — detected automatically each time you open the app • Manual entry — type a number without opening your contacts • Dial history — quickly redial recent numbers • Shake to open contacts picker • iCloud sync — rules stay in sync across your devices • Up to 1 prefix and 1 replacer free; Go Pro for unlimited GO PRO A single one-time purchase unlocks unlimited prefixes and replacers and removes all ads. GREAT FOR • Staff who dial through a PBX (prepend 9 or 0 to get an outside line) • Frequent international callers (replace + with 00 or a country code) • Anyone whose phone system requires number reformatting before dialling

About

Stop Spam

Features
Read full description

Stop Spam: The Ultimate Call Blocking Solution! Tired of robocalls, telemarketers, and unknown numbers? Stop Spam is the smart call blocker that protects you from unwanted calls while ensuring you never miss an important one. Key Features: - Advanced Call Blocking – Instantly block spam, robocalls, and fraud attempts. - Custom Block Lists – Add numbers manually or block entire prefixes. - AI-Powered Spam Detection – Automatically detects and filters suspicious calls. - Real-Time Caller ID – Instantly identify unknown numbers before you pick up. - High-Risk Caller Protection – Blocks VoIP-based spam and fraud attempts. - Regular Updates – Continuously updated spam database for maximum protection. Easy Setup & Seamless Experience - Works silently in the background, protecting you 24/7. - Lightweight and efficient—won’t drain your battery. - Simple and intuitive design for hassle-free use. Your Privacy Matters We never collect or share your contacts. Stop Spam is designed with privacy at its core — your data stays yours. Take Back Control of Your Calls! Stop wasting time on unwanted calls — download Stop Spam today and enjoy a stress-free calling experience! Terms of Use and Privacy Policy: https://www.stop-spam.online/privacy-policy/ Support: support@stop-spam.online

Screenshots

Prefix Dialer Pro4 screens
Stop Spam3 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard2 real differences · 7 level
Prefix Dialer Pro versus Stop Spam: the parameters behind the verdict, then further details
ParameterPrefix Dialer ProStop Spam
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 8 monthsFortnightly — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhoneiPhone
Requires iOS17.0 — better18
Further details — not scored
Size4 MB21 MB
Age rating4+4+
DeveloperSOHO S & NSerhii Laptii

In-app purchases

2 purchases

Prefix Dialer Pro

One-time2
  • Additional Set of 5 Prefixes and 5 Replacers$0.99
  • Set of 5 prefixes and 5 replacers$0.99
4 purchases

Stop Spam

Subscriptions4
  • Stop Spam Premium$4.991 Month
  • Stop Spam Premium$7.993 Months
  • Stop Spam Family Plan$12.991 Month
Show 1 more
  • Stop Spam Premium$24.991 Year

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.

Other comparisons