SpamBlocker vs Instaclean
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Spam/Trash mailbox reassignment
- Machine learning spam filtering
- Rule-based filtering (sender, subject)
- IMAP/POP3 support
- HTML image blocking
- Multi-account support
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■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)
Instaclean
This app helps you manage your inbox by unsubscribing from unwanted newsletters and bulk deleting emails. It allows you to block senders, delete all past emails from a sender, and clear out entire folders to free up storage. Declutter your email efficiently and reclaim your inbox.
- Unsubscribe from newsletters
- Block unwanted senders
- Bulk delete emails by sender
- Clear entire folders
- Delete large emails
- Manage multiple accounts
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Instaclean is a simple email cleaner app built by normal people like you. Email is a necessity but when you have thousands of unread junk mails, what do you do? - Either abandon the email and get a new one but you end up losing all your previous transactions and contacts. - Or you can declutter your inbox and block spam from hitting your inbox from now on. If you choose the latter, Instaclean is one of the applications that can help you fix your inbox. How does it work? With our two main features, you never have to spend another unproductive moment deleting emails. + Instaclean scans your inbox for newsletters and automatically lists them down in a simple user interface, where you can : - Unsubscribe/ Block future emails from a particular sender and delete all mails received thus far. - Or you can choose to continue receiving emails from the sender. - If our algorithm is not able to list down any of the newsletters that you have received, you can manually enter the sender address and block emails from them. + Instaclean also aggregates all the emails by sender, label and size that can be deleted in bulk. With this feature you can: - Delete all emails from a particular sender. - Completely clear out any folder in your mailbox. - Free up storage by deleting all the emails that take up most space. For Example, With a single click, you can delete all emails sent by instaclean.app or empty the spam folder or emails that are bigger than 5 MB. - We have helped our users clean up more than a billion emails. - Use Instaclean to declutter multiple mail accounts in one go. - We don’t charge you for these services. So you can achieve a squeaky clean mailbox for free of cost. What about your privacy? We love our privacy and know that everyone does too. That is why we built instaclean, keeping your privacy as our highest priority. We produce anonymized statistics on digital trends and sell the license. You have the option to delete all stored data at any given time. For any more information, please read our privacy policy or write to us. We would be happy to hear from you. Can it get better than this? Our team is working hard every day to elevate this experience for you. If you face any issues, please bear with us. Please bring it to our notice and we would love to solve them on priority. P.s. Join our 2M users and fall in love with our beautiful interface.
Screenshots
Verdict
SpamBlocker and Instaclean both sit at 2.8 stars, but that hides the real split: 59% of Instaclean's written reviews are positive against 14% of SpamBlocker's. Instaclean also leads on in-app purchases (none vs 1) and update cadence (every 3 weeks vs every 3 months). On price, rating, ads and monetization model 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
Both are free to download. SpamBlocker sells 1 one-off in-app purchase. Instaclean asks for nothing beyond the download.
SpamBlocker holds the better App Store score, 2.8 against 2.6. That said, the two scores are not equally well evidenced: Instaclean has 41 ratings behind it against 6, so its average is the more settled of the two. Written reviews complicate that: 14% of SpamBlocker's written reviews are positive against 59% of Instaclean's, so the app with the better star average is not the one people write more warmly about.
SpamBlocker ships an update every 3 months, Instaclean every 3 weeks. Both last shipped on October 23, 2026.
| Parameter | SpamBlocker | Instaclean |
|---|---|---|
| Price | Free | Free |
| Rating | 2.8 (6 ratings) — better | 2.6 (41 ratings) |
| Positive reviews | 13.9% of reviews | 59.2% of reviews — better |
| Number of ratings | 6 | 41 — better |
| Update frequency | Every 3 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 7 MB | 43 MB |
| Age rating | 4+ | 4+ |
| Developer | Seimitsusakufu LLC | Vumonic Datalabs OU |
Customer experience
SpamBlocker
Instaclean
In-app purchases
SpamBlocker
- Remove Ad&Limitation$0.99
Instaclean
No in-app purchases






