Comparison

MailCat vs BT

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

Head to head
About

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.

Highlights
  • Machine learning spam filtering
  • Rule-based email categorization
  • IMAP account support
  • Move emails to specified mailboxes
  • Blacklist and spam learning data
  • Multiple account switching
Features
Read full description

■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

About

BT

Control Bluetooth-enabled LED dimmers and switches directly from your smartphone. Adjust lighting settings with ease using this utility application.

Highlights
  • Control Bluetooth LED dimmers
  • Control Bluetooth switches
  • Adjust lighting settings
  • Smartphone utility
Features
Read full description

With BT-Switch app you can control Bluetooth led dimmers and switches.

Screenshots

MailCat4 screens
BT2 screens

Verdict

The call

The clearest difference is price: BT at Free against MailCat's $3.99. BT also leads on iOS requirement (8.1 vs 16.6). MailCat's advantage is review sentiment (13% vs 0%). On rating, ratings volume, update cadence and ads 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

BT is free to download; MailCat costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 1.0 for MailCat against 1.0 for BT. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews are what separate them: 13% of MailCat's written reviews are positive against 0% of BT's.

UpkeepUpdate frequency

MailCat ships an update every 4 months, BT every 5 months. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.

Scorecard4 real differences · 6 level
MailCat versus BT: the parameters behind the verdict, then further details
ParameterMailCatBT
Price$3.99Free — better
Rating1.0 (1 ratings)1.0 (1 ratings)
Positive reviews13.0% of reviews — better0.0% of reviews
Number of ratings11
Update frequencyEvery 4 months — betterEvery 5 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPadiPhone, iPod
Requires iOS16.68.1 — better
Further details — not scored
Size4 MB9 MB
Age rating4+4+
DeveloperSeimitsusakufu LLCElectromen Oy

Customer experience

MailCat

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews23 reviews
Positive13.0%
Neutral13.0%
Negative73.9%

BT

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

MailCat

No in-app purchases

None

BT

No in-app purchases

Questions

Is MailCat free?
MailCat costs $3.99, with no in-app purchases.
Is BT free?
BT is free to download, with no in-app purchases.
Which has better reviews, MailCat or BT?
MailCat and BT are both rated 1.0 out of 5 on the App Store, from 1 and 1 ratings respectively.
Do MailCat or BT have ads?
Neither MailCat nor BT shows ads.
Which is updated more often, MailCat or BT?
MailCat ships an update every 4 months, and BT every 5 months. Most recently, MailCat was updated on November 1, 2026 and BT on November 6, 2026.

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