Comparison

SMS Shield vs Spam Killer

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

Head to head
About

SMS Shield

This app uses machine learning to automatically filter unwanted SMS messages, including promotions, phishing attempts, and scam texts. It offers features like a frequent traveler mode to block international carrier messages and a custom block list for specific numbers or keywords. All filtering is done offline, ensuring 100% privacy.

Highlights
  • Automatic spam filtering
  • Frequent traveler mode
  • Custom block list
  • Offline filtering
  • Multi-lingual spam detection
Features
Read full description

SMS Shield is a Machine Learning-based SMS spam filter for iPhone. We trained it on what spam SMS looks like by showing it tens of thousands of spam SMSs beforehand. SMS Shield then learns and, to a high degree of confidence, can identify spam even it haven't seen it before. Besides spam blocking, SMS Shield includes innovative features like Frequent Traveler Mode. Features: + Automatic Spam Filtering SMS Shield will automatically block SMS spam like promotions, ads, phishing and scam attempts at stealing your sensitive information (e.g. SMSs claiming to be from your bank). + Frequent Traveler Mode Enable this innovative feature during your business travels to block the often-annoying SMSs sent by mobile operators when visiting other countries (e.g. "Welcome to country X..."). + Custom Block List With custom block list, you can block SMSes from specific phone numbers or that include specific keywords. Remember that annoying Ex who keeps SMSing you years later? Blocked! + 100% privacy guarenteed SMS Shield is an offline SMS filter. Meaning it does the filtering offline, on your device. All your texts are 100% private. + Multi-lingual spam detection SMS Shield detects spam (and is localized) in English, Portuguese (Brazil), Italian, Swedish, and Arabic. If you would like us to add a specific language email us with spam texts you receive (as many as possible). ------------------------------ Available Subscriptions: GOLD: 1 year spam filtering subscription SILVER: ½ year spam filtering subscription CLASSIC: 1 month spam filtering subscription Payment will be charged to your iTunes account at confirmation of purchase. Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. Your account will be charged for renewal within 24-hours prior to the end of the current period. To manage subscriptions or turn off auto-renewal go to your iTunes account settings after the purchase. Any unused portion of the free trial period will be forfeited when you purchase a subscription. Privacy Policy: https://www.taphive.com/smsshield/privacypolicy.html Terms: https://www.taphive.com/smsshield/tou.html

About

Spam Killer

Automatically filters unwanted SMS messages, blocks suspicious numbers, and detects scam texts using AI. Customize filters and whitelist important senders for a clean inbox.

Highlights
  • Blocks 99% of spam texts
  • Detects scams and phishing links
  • Customizable filters
  • AI-based spam detection
  • Whitelists important senders
  • Simple setup
Features
Read full description

Tired of annoying spam messages or scam texts? Spam Killer is your all-in-one SMS protection app that automatically filters out unwanted messages, blocks suspicious numbers, and keeps your inbox safe and clean — all powered by smart AI. Key Features: • Block 99% of spam texts • Detect scams, fraud, and phishing links • Customize filters with keywords or numbers • AI-based spam detection that learns and adapts • Whitelist important senders to never miss key messages • Simple setup — full protection in under a minute • Get alerts when new filters or updates are available Whether it’s promotions, phishing attempts, or robocalls via SMS — Spam Killer helps you stay one step ahead. Download now and start your free trial to experience full protection today! TERMS https://spam-blocker-sal3q.ondigitalocean.app/terms PRIVACY https://spam-blocker-sal3q.ondigitalocean.app/privacy

Screenshots

SMS Shield4 screens
Spam Killer4 screens

Verdict

The call

The clearest difference is rating: Spam Killer at 4.4 against SMS Shield's 3.2. Spam Killer also leads on monetization model (free with in-app purchases vs subscription) and review sentiment (50% vs 17%). SMS Shield's advantage is ratings volume (138 vs 16) and iOS requirement (11.0 vs 16.6). On price, ads, in-app purchases 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. SMS Shield sells 3 in-app purchases, starting at $0.99 per month and Spam Killer sells 5 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Spam Killer holds the better App Store score, 4.4 against 3.2. That said, the two scores are not equally well evidenced: SMS Shield has 138 ratings behind it against 16, so its average is the more settled of the two. Written reviews point the same way: 17% of SMS Shield's written reviews are positive against 50% of Spam Killer's.

UpkeepUpdate frequency

SMS Shield ships an update fortnightly, Spam Killer every 2 days. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

Scorecard6 real differences · 4 level
SMS Shield versus Spam Killer: the parameters behind the verdict, then further details
ParameterSMS ShieldSpam Killer
PriceFreeFree
Rating3.2 (138 ratings)4.4 (16 ratings) — better
Positive reviews16.7% of reviews50.0% of reviews — better
Number of ratings138 — better16
Update frequencyFortnightlyEvery 2 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationSubscriptionFree with in-app purchases — better
DevicesiPhone, iPod — betteriPhone
Requires iOS11.0 — better16.6
Further details — not scored
Size15 MB19 MB
Age rating4+4+
DeveloperTaphive GmbHJalm Studio Inc

Customer experience

SMS Shield

All ratings138 ratings
Positive49.3%
Neutral8.0%
Negative42.8%
Written reviews84 reviews
Positive16.7%
Neutral3.6%
Negative79.8%

Spam Killer

All ratings12 ratings
Positive83.3%
Neutral0.0%
Negative16.7%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

Bugs and requests

SMS Shield

Reported bugs

14 issues
  • Filters out legitimate texts
  • Doesn't block known spam
  • Requires manual input for blocking
  • No response from support
  • Doesn't block SMS from email
Show 9 more
  • Machine learning is ineffective
  • App still filtering after cancellation
  • App doesn't work after iOS update
  • Keywords not being blocked
  • False positives (blocking important messages)
  • Cannot cancel subscription in-app
  • App asks for sensitive permissions
  • Free trial doesn't work as advertised
  • Fails to modify records when classifying SMS

Requested features

6 requests
  • More blocking of SMS scams
  • Option to mark SMS as spam or not spam
  • Ability to whitelist keywords
  • Better machine learning/training
  • Improved support responsiveness
Show 1 more
  • One-time purchase option

Spam Killer

Not enough reviews yet to summarise bugs or requests.

In-app purchases

3 purchases

SMS Shield

Subscriptions3
  • Classic7 Days trial$0.991 Month
  • Silver7 Days trial$3.996 Months
  • Gold7 Days trial$8.491 Year
5 purchases

Spam Killer

Subscriptions5
  • 1 week$3.997 Days
  • One Week Premium Protection3 Days trial$5.997 Days
  • 3 months3 Days trial$14.993 Months
Show 2 more
  • Three Months Premium$19.993 Months
  • Year of SpamKiller Pro$39.991 Year

Questions

Is SMS Shield free?
SMS Shield is free to download, with in-app purchases available.
Is Spam Killer free?
Spam Killer is free to download, with in-app purchases available.
Which has better reviews, SMS Shield or Spam Killer?
Spam Killer is rated higher. SMS Shield averages 3.2 out of 5 from 138 ratings, while Spam Killer averages 4.4 from 16 ratings.
Do SMS Shield or Spam Killer have ads?
Neither SMS Shield nor Spam Killer shows ads.
Which is updated more often, SMS Shield or Spam Killer?
SMS Shield ships an update fortnightly, and Spam Killer every 2 days. Most recently, SMS Shield was updated on October 29, 2026 and Spam Killer on October 24, 2026.

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