MailCat vs SMS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MailCat
This app helps organize your inbox by automatically categorizing emails using machine learning and custom rules. It can filter spam and move messages to designated mailboxes, supporting IMAP accounts.
- Machine learning spam filtering
- Rule-based email categorization
- IMAP account support
- Move emails to specified mailboxes
- Blacklist and spam learning data
- Multiple account switching
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■MailCat is a Mail Categorizer: MailCat is a Mail Categorization App. MailCat has two kinds of categorization method --- a machine learning categorization and a rule based categorization. MailCat can filter out spams from the incoming mail messages by the machine learning categorizer, and move mail messages to the specified mailbox by rules. MailCat has no mail sending facility and has only support for IMAP. POP/SMS/MMS are not supported. ■How to connect to an IMAP mail server: To connect an IMAP 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 IMAP 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 to switch accounts Tapping/Swiping the navigation bar of the Mailbox list switches the account if multiple accounts are available. * Tap/Swipe to move around mailboxes (among 'Quick View List') * Move/Delete/Mark mail messages by the toolbar on the navigation bar * Tap/Swipe the navigation bar to turn over mail messages * Add a mail to the blacklist/spam learning data by swiping *Tap a Tab bar to switch the rule view. There are 4 views to show the rules for ‘Sender’, ’Subject’, ‘Message’, ‘Compound’. ■Spam filtering: MailCat 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, MailCat starts judging which mail is spam or not. 8. Check the filtering result on Monitor. 9. Correct errors and 'Pull down to Refresh" or "Long press( 2sec) on the navigation bar", re-learning starts and your spam filter gets smarter. Repeat the steps(8-9) until no errors are found. ■Mail Rules: There are 4 conditional fields for mail rules --- sender, subject, message, compound. Mail rules are only applied for 'INBOX'. To edit or create a mail rule, tap 'Edit' button on the Mailbox list. The selection menu appears, choose 'Rule'. Mail rules for ‘Sender’ will appear. Tap a Tab bar to switch a view . ■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
SMS
Automatically forward SMS messages based on keywords to your email. This app processes all rules locally for enhanced privacy and security, offering offline operation. It's ideal for backing up important messages, verification codes, and separating work and personal communications.
- Keyword matching for SMS forwarding
- Auto email forwarding
- Local device processing
- Secure and reliable forwarding
- Offline operation
- Verification code forwarding
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SMS Forwarder - Auto Forward SMS, OTP & 2FA Codes to Email, Telegram & Webhook! Core Features: - Keyword Matching - Support multiple keywords, accurately match SMS to forward - OTP & 2FA Forwarding - Automatically forward verification codes and two-factor auth SMS - Multi-Channel Forwarding - Forward to Email, Telegram or custom Webhook - Webhook Templates - Built-in formats for DingTalk, Feishu, WeCom, Slack, Discord and more - Failure Alerts - Get a local notification when forwarding fails - Local Device Processing - All forwarding rules are stored locally, SMS goes straight to your own email or channels - Secure and Reliable - Built on iOS Shortcuts, no SMS content leakage Perfect For: * Auto-forward Verification Codes - Automatically forward various verification codes to email for archiving * Important Notification Monitoring - Auto-forward important SMS from banks, logistics, etc. * Separate Work and Life - Forward work-related SMS to work email, keep life SMS on phone * Multi-device Sync - View SMS on multiple devices via email * Information Backup - Auto-backup important SMS to email, prevent phone loss * Group Notification Sync - Forward important SMS to DingTalk, Feishu or Telegram groups via Webhook Privacy Promise: No personal data • No SMS uploads • No registration Premium Plans: Lifetime Membership - Unlock all features permanently - Pay once, use forever - No subscription needed, incredible value Annual Subscription - Auto-renewable yearly subscription - Full access to all premium features - Flexible, cancel anytime Free Trial - 3-day free trial with full features Terms & Policies - User Agreement: http://rule.linkfun.top/25A6/user-agreement.html?lang=en - Privacy Policy: http://rule.linkfun.top/25A6/privacy-policy.html?lang=en - Disclaimer: http://rule.linkfun.top/25A6/disclaimer.html?lang=en - End User License Agreement (EULA): http://rule.linkfun.top/25A6/eula.html?lang=en
Screenshots
Verdict
The clearest difference is price: SMS at Free against MailCat's $3.99. SMS also leads on update cadence (every 2 months vs every 4 months). MailCat's advantage is in-app purchases (none vs 2). On rating, ratings volume, ads 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
SMS is free to download; MailCat costs $3.99 up front. SMS sells 2 in-app purchases, starting at $6.99 per year. MailCat asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 1.0 for MailCat against 1.0 for SMS. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
MailCat ships an update every 4 months, SMS every 2 months. The most recent releases landed on June 5, 2026 and September 1, 2026 respectively.
| Parameter | MailCat | SMS |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 1.0 (1 ratings) | 1.0 (1 ratings) |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 | 1 |
| Update frequency | Every 4 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Freemium — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.6 | 16.0 — better |
| Further details — not scored | ||
| Size | 4 MB | 44 MB |
| Age rating | 4+ | 4+ |
| Developer | Seimitsusakufu LLC | 慧君 李 |
Customer experience
MailCat
SMS
In-app purchases
MailCat
No in-app purchases
SMS
- Annual Subscription$6.991 Year
- Lifetime Access$7.99









