Comparison

PrefixPlus vs Simply Filter SMS

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

Head to head
About

PrefixPlus

Easily add international or custom prefixes to all your phone numbers in contacts simultaneously. This utility helps manage multiple contact entries for different calling regions without overwriting existing numbers. Ensure you back up your contacts before use.

Highlights
  • Add prefixes to multiple contacts at once
  • Does not overwrite existing numbers
  • Customizable prefix numbers
  • Customizable label for new entries
  • Supports iCloud and Gmail synchronized contacts
Features
Read full description

PrefixPlus allows you to add the prefix number to phone numbers in Contacts at once. Phone numbers with the prefix number will not be replaced but added to contacts. For example, if you set the number "+81" and the label "Call(JP)", contacts will be updated as follows. [Before update] Home: 03-1234-5678 Mobile: 090-1234-5678 [After update] Home: 03-1234-5678 Mobile: 090-1234-5678 Call(JP) Home: +81-3-1234-5678 Call(JP) Mobile: +81-90-1234-5678 (Caution) Be sure to back up contacts as security against accidents. For example, if you back up to iCloud, you can restore contacts at some point in the past. Please note that you can add prefix numbers to contacts synchronized with local, iCloud, Gmail only.

About

Simply Filter SMS

This app automatically filters unwanted text messages on your iPhone or iPad. It uses AI and customizable rules to sort messages from unknown senders into categories like Junk, Promotions, or Transactions, all processed on your device for privacy.

Highlights
  • AI-powered spam filtering
  • Customizable keyword rules
  • Automatic message categorization
  • On-device processing for privacy
  • Support for 10 languages
  • Trusted country filtering
Features
Read full description

Take back control of your inbox. Simply Filter SMS is a privacy-first, open-source text message filter for iPhone and iPad. Create keyword rules and smart filters to automatically move unwanted messages from unknown senders to Junk, Promotions, or Transactions - completely on-device. What's new in this version: • Export & Import Filters - Share your filter setup with a friend. Export from Filter Tools in the menu and send the file. • Test Your Filters - Redesigned with live results so you can see matches instantly. • Help - Redesigned with FAQs and a Get Started guide. • Accent Color - Pick an accent from the menu; buttons and icons follow it across the app. In case you missed, here's what was updated recently: • Regex Filters - Create powerful pattern-matching filters using regular expressions for precise control. • AI Filtering - Automatic filtering is AI-powered, smarter and more accurate, with support for 10 languages including English, Hebrew, Spanish, French, German, Arabic, and more. • Trusted Countries - Automatically allow messages from specific countries by phone prefix. • 11 Languages - The app is available in English, Hebrew, Spanish, French, German, Arabic, Portuguese, Japanese, Korean, Italian, and Simplified Chinese. • Accessibility Support - Fully usable with VoiceOver, Voice Control, Dynamic Type, and Reduce Motion. • Native iPad Support - Full iPad experience with sidebar navigation and optimized layouts for larger screens. • Tip Jar - Support the app's development with an optional tip. Simply Filter SMS is free forever. • Multiple bug fixes and performance improvements.

Screenshots

PrefixPlus2 screens
Simply Filter SMS4 screens

Verdict

The call

The clearest difference is in-app purchases: PrefixPlus at none against Simply Filter SMS's 3. PrefixPlus also leads on rating (4.7 vs 4.4) and ratings volume (1.1K vs 69). Simply Filter SMS's advantage is ads (none vs shown) and update cadence (every 9 days vs every 2 months). On price and device support 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. Simply Filter SMS sells 3 one-off in-app purchases. PrefixPlus asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

PrefixPlus holds the better App Store score, 4.7 against 4.4. That said, the two scores are not equally well evidenced: PrefixPlus has 1.1K ratings behind it against 69, so its average is the more settled of the two. Written reviews complicate that: 72% of PrefixPlus's written reviews are positive against 81% of Simply Filter SMS's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

PrefixPlus ships an update every 2 months, Simply Filter SMS every 9 days. The most recent releases landed on October 24, 2026 and October 30, 2026 respectively.

Scorecard8 real differences · 2 level
PrefixPlus versus Simply Filter SMS: the parameters behind the verdict, then further details
ParameterPrefixPlusSimply Filter SMS
PriceFreeFree
Rating4.7 (1.1K ratings) — better4.4 (69 ratings)
Positive reviews71.8% of reviews80.6% of reviews — better
Number of ratings1.1K — better69
Update frequencyEvery 2 monthsEvery 9 days — better
AdsYesNo — better
In-app purchasesNo — betterYes
MonetizationAd-supported — betterFree with in-app purchases
DevicesiPhone, iPodiPhone, iPad
Requires iOS15.6 — better17.0
Further details — not scored
Size8 MB8 MB
Age rating4+4+
Developeryasuhiko nagaharaAdi Ben-Dahan

Customer experience

PrefixPlus

All ratings1,056 ratings
Positive90.0%
Neutral6.0%
Negative4.1%
Written reviews71 reviews
Positive71.8%
Neutral8.5%
Negative19.7%

Simply Filter SMS

All ratings68 ratings
Positive86.8%
Neutral0.0%
Negative13.2%
Written reviews31 reviews
Positive80.6%
Neutral0.0%
Negative19.4%

Bugs and requests

PrefixPlus

Reported bugs

3 issues
  • Crashes on iOS 13.3
  • Duplicate contact entries created
  • Prefix not applied to all contacts

Requested features

3 requests
  • Option to add space between prefix and number
  • Support for local/offline contacts
  • Ability to selectively update contacts

Simply Filter SMS

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

PrefixPlus

No in-app purchases

3 purchases

Simply Filter SMS

One-time3
  • Small Tip$1.99
  • Medium Tip$4.99
  • Large Tip$9.99

Questions

Is PrefixPlus free?
PrefixPlus is free to download, with no in-app purchases.
Is Simply Filter SMS free?
Simply Filter SMS is free to download, with in-app purchases available.
Which has better reviews, PrefixPlus or Simply Filter SMS?
PrefixPlus is rated higher. PrefixPlus averages 4.7 out of 5 from 1.1K ratings, while Simply Filter SMS averages 4.4 from 69 ratings.
Do PrefixPlus or Simply Filter SMS have ads?
PrefixPlus shows ads; Simply Filter SMS does not.
Which is updated more often, PrefixPlus or Simply Filter SMS?
PrefixPlus ships an update every 2 months, and Simply Filter SMS every 9 days. Most recently, PrefixPlus was updated on October 24, 2026 and Simply Filter SMS on October 30, 2026.

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