Comparison

SpamBlocker vs Master Cleaner

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

Head to head
About

SpamBlocker

This app helps manage unwanted emails by reassigning spam mailboxes and filtering incoming messages. It uses machine learning and rule-based systems to identify and block junk mail, supporting IMAP/POP3 accounts. It does not have mail sending capabilities.

Highlights
  • Spam/Trash mailbox reassignment
  • Machine learning spam filtering
  • Rule-based filtering (sender, subject)
  • IMAP/POP3 support
  • HTML image blocking
  • Multi-account support
Read full description

■SpamBlocker supports Spam/Trash mailbox’s reassignment. Some (IMAP) mail servers support a machine learning spam filtering by using the mail data in the spam mailbox. If the spam mailbox matches between SpamBlocker and the mail server, SpamBlocker can feedback its spam filtering result to the mail server. Then the spam mail traffic can be reduced. ■SpamBlocker provides a spam filtering feature SpamBlocker(the usage is explained at the online help in the App) can filter out spams(junk mails) from the incoming mail messages by a spam filter which is generated by the SpamBlocker's built-in machine learning engine. SpamBlocker also supports 'rule based' filtering by specifying "sender's mail address" or "subject"'s substring.
 SpamBlocker supports IMAP/POP3 and can access only Inbox, spam box, trash box. SpamBlocker has no mail sending facility. As for the POP3 mail filtering, SpamBlocker has to get started before other mailers, otherwise spams will be downloaded to other mailers because POP3 has no synchronization mechanism . SpamBlocker supports HTML image blocking. SMS/MMS are not supported. SpamBlocker adapts the advertising free application model, but it has no resident toolbar, so the client area with an advertisement banner isn't narrower than other standard iOS applications. 
■Main Features: •Fast machine learning engine optimized for a mobile device ◦Learn ham and spam mail messages to generate a spam filter ◦Spam filtering time is very short compared with mail messages downloading time. ◦Multi-language. In this version, only English and Japanese are supported. 
European languages will be OK if it's based on alphabets. ◦Multi-account ■How to connect to an mail server: To connect an mail server, just specify your full email address as your login name(username) and the password you log in to your account. If you don't know your login name/password, contact an organization or personnel in charge of the mail server to get a hostname, user id(name), password. ■Basic operation * Pull down to Refresh/Long Press to reload&spam filtering * Push up to download older mails at the bottom of message lists * Tap/Swipe the navigation bar to move around mailboxes * Move/Delete/Mark mail messages by the toolbar on the navigation bar * Tap/Swipe the navigation bar to turn over mail messages * Swipe To POP3 server to move back a mail to POP3 server. * Add a mail to the blacklist/spam learning data by swiping a cell ■Spam filtering: SpamBlocker generates a spam filter by learning from spam and ham messages in INBOX. Just follow the steps, you can have your own spam filter. 1. Tap 'Edit' button in Monitor. 2. Pick up several mail messages by tapping each table cell. 3. Tap "SPAM" button on the command bar. 4. Likewise pick up mails, and "HAM" button on the command bar. 5. "Pull down to Refresh" or "Long press on the navigation bar" triggers Machine learning, then a spam filter will be generated. 6. Repeat the steps(1-5) until the number of spams and hams reaches about 16. 7. After learning 16 spams and 16 hams, SpamBlocker is ready to start judging which mail is spam or not. Set the spam filter switch on the account setting if you want to start the spamfiltering. 8. Check the filtering result on Monitor. 9. Correct errors and 'Pull down to Refresh" or "Long press on the navigation bar", re-learning starts and your spam filter gets smarter. Repeat the steps(8-9) until no errors are found. ■Spam Rule Filtering: Please don't forget about turning on "Spam Rule switch" at the account setting after setting rules. ■Other usage: Please visit support page. http://www.seimitsusakufu.com/iOS/mailapps/en/support.html. ■Support: To get a further support , contact through the following mail address. support_seimitsu@jcom.home.ne.jp ■Copyright: Some of icons in this software are designed by Icons8 (http://icons8.com)

About

Master Cleaner

This app helps you reclaim storage space by automatically detecting and removing duplicate photos, videos, and contacts. It also offers features to organize your media, enhance images, and secure personal files in a private space.

Highlights
  • Detect and delete duplicate photos, screenshots, and videos
  • Intelligent photo management with swipe sorting
  • Identify and remove similar or large videos
  • Scan and optimize contact lists, merge duplicates
  • Secure personal files in a password-protected space
  • Enhance and restore old or blurry photos
Features
Read full description

We handle a lot of data every day and don't have time to clean up our devices, remove duplicate images and contacts, clear the app cache, or remove unused screenshots. The battery life is only half a day, the device storage is nearly full, and space utilization is alarmingly high. When your device barely responds to your commands, you only decide to clear the space manually. Actually, you don't have the time or interest to clear the cache, pick duplicate images yourself, or do any of that. Does that make sense? Master Cleaner is a smart, efficient, and useful cleaning assistant to solve your storage problem and make your cleaning up process as easy as possible. It automatically detects all the unnecessary files that take up storage, identical and similar photos, and large videos using a special algorithm. Get rid of the clunky, huge photographs that take up space storage. Delete duplicate contacts, phone numbers, and names from your smartphone to optimize speed. Using our app can help you keep your phone secure and clean at all times! So why do you still waiting? Start improving and caring for your device right away! Get Master Cleaner right now! * Gets rid of duplicates Detect and delete duplicate photos, screenshots and videos with one click. Easily to release storage space. * Intelligent photo management Delete useless photos with simple swipes. Choose the best photos to keep while cleaning. Swipe left and right to sort photos. * Free up space Identify similar videos and filter large videos, and remove all unwanted videos in a single tap. * Quick contact organizer Scan and optimize contacts list. Merge duplicate contacts and clean contacts that have no phone numbers or names. * Secure personal privacy Hide photos, videos and contacts in the ‘Secret Space’. The app creates a password-protected secure space to keep your file safe. * Calender & Widget Delete spam invitations(ads) and expired events in Calendar. Set widgets to check your battery, storage and do quick cleaning anywhere. * Image enhancement Turn your portraits and facial photos into HD high-definition. Restore old and blurry photos to give them new life. Enhance dissatisfied photos, fix closed eyes and edit your facial expressions. Payment&Subscription: Choose from the following subscription options for unlimited access to all features: • Weekly • Monthly • Annual Master Cleaner’s free trial allows you unlimited access to all features for the duration of 3 days. Your account will be automatically charged for renewal, based on the annual subscription plan, within 24 hours before the end of the 3 day free trial period. You can cancel auto-renewal at any time, given that the cancellation is at least 24 hours before the end of the current period. Any unused portion of a free trial period will be forfeited when making a purchase of an auto-renewing subscription. Terms of Service: https://www.qaurusmobile.com/terms-of-service Privacy Policy: https://www.qaurusmobile.com/privacy-policy

Screenshots

SpamBlocker4 screens
Master Cleaner4 screens

Verdict

The call

The clearest difference is review sentiment: Master Cleaner at 71% against SpamBlocker's 14%. Master Cleaner also leads on rating (4.5 vs 2.8) and update cadence (every 10 days vs every 3 months). SpamBlocker's advantage is ads (none vs shown) and monetization model (free vs free with in-app purchases). On price, 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. SpamBlocker sells 1 one-off in-app purchase and Master Cleaner sells 5 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Master Cleaner holds the better App Store score, 4.5 against 2.8. That said, the two scores are not equally well evidenced: Master Cleaner has 3.5K ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 14% of SpamBlocker's written reviews are positive against 71% of Master Cleaner's.

UpkeepUpdate frequency

SpamBlocker ships an update every 3 months, Master Cleaner every 10 days. The most recent releases landed on October 15, 2026 and October 14, 2026 respectively.

Scorecard7 real differences · 3 level
SpamBlocker versus Master Cleaner: the parameters behind the verdict, then further details
ParameterSpamBlockerMaster Cleaner
PriceFreeFree
Rating2.8 (6 ratings)4.5 (3.5K ratings) — better
Positive reviews13.9% of reviews70.8% of reviews — better
Number of ratings63.5K — better
Update frequencyEvery 3 monthsEvery 10 days — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.612.0 — better
Further details — not scored
Size7 MB128 MB
Age rating4+4+
DeveloperSeimitsusakufu LLCQaurus Mobile

Customer experience

SpamBlocker

All ratings6 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews36 reviews
Positive13.9%
Neutral5.6%
Negative80.6%

Master Cleaner

All ratings3,456 ratings
Positive86.1%
Neutral5.9%
Negative8.0%
Written reviews113 reviews
Positive70.8%
Neutral4.4%
Negative24.8%

Bugs and requests

SpamBlocker

Not enough reviews yet to summarise bugs or requests.

Master Cleaner

Reported bugs

5 issues
  • App crashes and freezes
  • Inability to cancel subscription
  • Unexpected data deletion
  • Compatibility issues with older devices
  • Unreliable performance

Requested features

5 requests
  • Improved contact management
  • Better photo organization tools
  • More customization options
  • Direct customer support channel
  • Transparent subscription model

In-app purchases

1 purchases

SpamBlocker

One-time1
  • Remove Ad&Limitation$0.99
5 purchases

Master Cleaner

Subscriptions5
  • Pro Weekly$4.997 Days
  • Pro Weekly3 Days trial$4.997 Days
  • Pro Monthly3 Days trial$9.991 Month
Show 2 more
  • Pro Yearly$39.991 Year
  • Pro Yearly3 Days trial$39.991 Year

Questions

Is SpamBlocker free?
SpamBlocker is free to download, with in-app purchases available.
Is Master Cleaner free?
Master Cleaner is free to download, with in-app purchases available.
Which has better reviews, SpamBlocker or Master Cleaner?
Master Cleaner is rated higher. SpamBlocker averages 2.8 out of 5 from 6 ratings, while Master Cleaner averages 4.5 from 3.5K ratings.
Do SpamBlocker or Master Cleaner have ads?
Master Cleaner shows ads; SpamBlocker does not.
Which is updated more often, SpamBlocker or Master Cleaner?
SpamBlocker ships an update every 3 months, and Master Cleaner every 10 days. Most recently, SpamBlocker was updated on October 15, 2026 and Master Cleaner on October 14, 2026.

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