MailCat vs Authenticator
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
Authenticator
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Authenticator: 2FA & Passkey – Secure Login Made Simple Protect your online accounts with Authenticator, a secure app that generates 2FA codes (OTP) and enables modern Passkey login for passwordless, phishing-resistant access. With encrypted storage, iCloud backup, and cross-device sync, your accounts stay safe, private, and always accessible. --------- Key Benefits ▶ 1. Strong 2FA Security Generate time-based one-time passwords (OTP) to add an extra layer of protection to your email, banking, and social media accounts. ▶ 2. Modern Passkey Login Say goodbye to passwords. Use Passkeys for fast, secure, and passwordless sign-ins designed to resist phishing and simplify login across devices. ▶ 3. Secure iCloud Backup All codes and Passkeys are encrypted and safely stored in iCloud. Restore instantly on new devices and keep your security keys available everywhere. ▶ 4. Cross-Device Synchronization Access your accounts on all Apple devices with automatic sync. Whether on iPhone, iPad, or Mac, your tokens and Passkeys are always in sync. ▶ 5. Import & Export Flexibility • Import 2FA codes from other authenticator apps with QR scan or JSON file. • Export your codes securely whenever you need. ▶ 6. Organized & Easy to Use Create folders for different accounts, drag-and-drop to reorder, and manage all your security tokens in one place. ▶ 7. Advanced Privacy Protection • Lock the app with a PIN • Offline support to access OTP codes anytime --------- Why Choose Authenticator: 2FA & Passkey? • Combines proven 2FA OTP security with the future of passwordless Passkeys • Ensures your data is encrypted, private, and recoverable • Designed for simplicity, speed, and maximum account protection Stay ahead of hackers and take control of your digital security today. Download Authenticator: 2FA & Passkey today and secure your accounts with the perfect balance of security + convenience. --------- Subscription Information Furthermore, this app offers auto-renewing subscription, granting you unlimited access to all premium features throughout the subscription period. About subscription: payment will be charged to iTunes Account at confirmation of purchase. Subscriptions automatically renew 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. You can manage your subscriptions and turn off auto-renewal by going to your Account Settings after purchase. Any unused portion of a free trial period (if provided) will be forfeited upon purchasing a subscription (if applicable). For more information, please see our Privacy Policy and Terms of Service. Terms of Service: https://xtrustai.github.io/tos Privacy Policy: https://xtrustai.github.io/privacy.html
Screenshots
Verdict
The clearest difference is price: Authenticator at Free against MailCat's $3.99. Authenticator also leads on update cadence (every 2 weeks vs every 4 months). MailCat's advantage is in-app purchases (none vs 2) and ads (none vs shown). On device support and iOS requirement 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
Authenticator is free to download; MailCat costs $3.99 up front. Authenticator sells 2 in-app purchases, starting at $49.99 per year. MailCat asks for nothing beyond the download.
MailCat ships an update every 4 months, Authenticator every 2 weeks. The most recent releases landed on October 23, 2026 and October 7, 2026 respectively.
| Parameter | MailCat | Authenticator |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 1.0 (1 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 4 months | Every 2 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Paid | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.6 — better | 17 |
| Further details — not scored | ||
| Size | 4 MB | 36 MB |
| Age rating | 4+ | 4+ |
| Developer | Seimitsusakufu LLC | AQUAWOOD PTE. LTD. |
In-app purchases
MailCat
No in-app purchases
Authenticator
- year3 Days trial$49.991 Year
- lifetime$99.99









