Comparison

MailBuzzr for Outlook vs CosmoSia

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

Head to head
About

MailBuzzr for Outlook

Manage your Outlook, Hotmail, and Live email accounts with this app. It offers a unified inbox, smart sorting of important mail like travel and bills, and tools to unsubscribe from unwanted newsletters. Features include customizable alerts, quick cleanup routines, and privacy controls.

Highlights
  • Unified inbox for multiple accounts
  • Smart sorting of travel, bills, and subscriptions
  • One-tap unsubscribe from newsletters
  • Customizable smart alerts
  • Quick email cleanup routines
  • Attachment and contact management
  • App Lock for privacy
Features
Read full description

Email app for Outlook, Hotmail and Live accounts. Read, sort and clean up your mail on iPhone, iPad and iPhone Duo, with Mail Hub powered by Apple Intelligence. INBOX • Add multiple Microsoft accounts • Unified inbox, or one account at a time • Focused inbox for the mail that matters • Swipe to archive, delete, flag or move • Folders and smart folders • Attachments, contacts and signatures PIN IMPORTANT MAIL Keep an important email at the top of your inbox so it stays in view. Pin it for today, until tomorrow or until a date you choose. Or pin it until you reply or forward, and it unpins itself. MAIL HUB Powered by Apple Intelligence, Mail Hub finds useful mail and sorts it for you on your iPhone or iPad. • Travel: See flights, hotels and trains as trip cards with routes, dates and booking references. Add a trip to Calendar or copy your booking reference. • Packages: Follow each delivery from ordered to shipped, out for delivery and delivered. Copy the order or tracking number. • Bills and receipts: See the amount, merchant and date of every payment. Copy the reference number or share the receipt. • Subscriptions: See every mailing list, how many emails each sender sends per day over the last 30 days, and how many you left unopened. Unsubscribe in one tap. UNSUBSCRIBE TO STOP UNWANTED MAILS AND NEWSLETTERS See how often each sender writes and how much you read. Unsubscribe in one tap. SMART ALERTS Get notified only for mail that matters. Set rules for senders, subjects and attachments. Pause with quiet hours. ROUTINES Save a cleanup task and run it in one tap. Mark as read, flag, archive or move mail. THEMES Pick a light or dark theme, or design your own. SPLIT VIEW See your inbox and a message side by side. PRIVACY Sign in on Microsoft's own page. MailBuzzr never sees your password. Mail Hub and the smart classifier run on your device. App Lock keeps your mail private. MAILBUZZR UNLIMITED Free includes 2 accounts, 5 smart alerts and 5 routines, with ads. Unlimited removes ads and all limits. Choose monthly or yearly. Payment is charged to your Apple Account. Subscriptions renew automatically unless cancelled at least 24 hours before the period ends. Manage or cancel in your Apple Account settings. Mail Hub's smart classifier uses Apple Intelligence, which requires a compatible iPhone or iPad. Terms: https://mailbuzzr.com/terms Privacy: https://mailbuzzr.com/privacy MailBuzzr is not affiliated with or endorsed by Microsoft or Apple. Outlook and Hotmail are trademarks of Microsoft Corporation.

About

CosmoSia

Create a personalized email address with your own domain, offering carrier-like ease of use and robust privacy features. Manage multiple email accounts, block unwanted messages, and enjoy a user-friendly interface. Ideal for those seeking a professional or custom email solution.

Highlights
  • Create custom email addresses
  • Manage multiple email accounts
  • Block unwanted emails
  • Easy setup
  • Carrier-like usability
  • Privacy-focused
Features
Read full description

Recommended for those who are considering moving away from carrier email. You can create "XX@cosmosia.email" which is as easy to use as your carrier email! Made in Japan, so you can be sure of your privacy. Make your email more fun! The long-awaited iOS version of the free email app with over 1 million users is now available! - Just tap! The all-new "Reactions" feature Get your feelings across without words: Just like in a chat, react to emails with emoji. Reaches the other person even without the app: When you add a reaction, the recipient automatically receives a clear notification email. No matter which email service they use — Gmail, docomo mail, Yahoo! Mail, and more — your "I saw it" comes through loud and clear. Stay connected like a conversation: Even in group exchanges, you can see at a glance who reacted and how, so conversations keep flowing and stay fun. - You can create your own email address! You can create your own e-mail address such as XX@cosmosia.email. You can use email addresses such as XX@cosmosia.email. The email address will be linked to your phone number like a carrier email address, so please consider this when you are thinking of moving from a carrier email address! Email address is available only when you purchase the subscription "CosmoSia Email Plan (Monthly)". We also recommend this service when you move to ahamo, povo, LINEMO, or other plans that do not include carrier email! ==================== - You can manage multiple email services at once. IMAP4 (Gmail, docomo mail, etc.) is supported.   - It is a standard email application for low-cost smartphones and MVNOs. It's easy to use, just like a carrier email, and it's popular among low-cost smartphone users! - Easy to set up Just set your email address and password and you're ready to go. Organize your mailbox now. - No more unwanted e-mails! We support a "reject list" function that allows you to prevent unwanted e-mails from entering your inbox. - Basic functions are free! The installation is free and the basic functions are free no matter how many times you use them. A predetermined usage fee is required to use CosmoSia Mail. You will have to pay for the communication charges incurred when sending and receiving emails. ==================== The following email services can be used docomo mail au-mail R mail Y! mobile mail Yahoo! JAPAN mail iCloud mail Gmail Outlook/Hotmail mineo mail so-net mail BIGLOBE mail We support the setup of many other email services. * You cannot use your UQ mobile email address (XX@uqmobile.jp). Please look forward to future updates for support of other mail services! ==================== About the trademark docomo mail is a trademark of NTT DOCOMO, INC. in Japan.

Screenshots

MailBuzzr for Outlook4 screens
CosmoSia4 screens

Verdict

The call

The clearest difference is review sentiment: MailBuzzr for Outlook at 66% against CosmoSia's 18%. MailBuzzr for Outlook also leads on rating (4.1 vs 1.0) and ratings volume (518 vs 1). On price, update cadence, ads and in-app purchases 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. MailBuzzr for Outlook sells 9 in-app purchases, starting at $9.99 per month and CosmoSia sells 1 in-app purchase, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

MailBuzzr for Outlook holds the better App Store score, 4.1 against 1.0. That said, the two scores are not equally well evidenced: MailBuzzr for Outlook has 518 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 66% of MailBuzzr for Outlook's written reviews are positive against 18% of CosmoSia's.

UpkeepUpdate frequency

MailBuzzr for Outlook ships an update fortnightly, CosmoSia every 3 weeks. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

Scorecard3 real differences · 7 level
MailBuzzr for Outlook versus CosmoSia: the parameters behind the verdict, then further details
ParameterMailBuzzr for OutlookCosmoSia
PriceFreeFree
Rating4.1 (518 ratings) — better1.0 (1 ratings)
Positive reviews65.7% of reviews — better17.9% of reviews
Number of ratings518 — better1
Update frequencyFortnightly — betterEvery 3 weeks
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad — betteriPhone
Requires iOS17.016.0 — better
Further details — not scored
Size38 MB219 MB
Age rating4+4+
DeveloperAverSys MobileACCESS CO., LTD.

Customer experience

MailBuzzr for Outlook

All ratings518 ratings
Positive78.4%
Neutral5.2%
Negative16.4%
Written reviews265 reviews
Positive65.7%
Neutral9.4%
Negative24.9%

CosmoSia

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews39 reviews
Positive17.9%
Neutral15.4%
Negative66.7%

Bugs and requests

MailBuzzr for Outlook

Reported bugs

4 issues
  • Login issues and password problems
  • Notifications not working properly
  • Compatibility problems with newer iOS versions
  • Slow email loading and refreshing

Requested features

5 requests
  • Add more email account support
  • Improve email organization and search
  • Implement a junk mail folder
  • Allow bulk email deletion
  • Add customization options

CosmoSia

Not enough reviews yet to summarise bugs or requests.

In-app purchases

9 purchases

MailBuzzr for Outlook

Subscriptions2
  • Unlimited - Monthly$9.991 Month
  • Unlimited - Yearly$39.991 Year
One-time7
  • No Ads$1.99
  • Upgrade to Lite$2.99
  • Upgrade to Pro$2.99
Show 4 more
  • Lite$3.99
  • Upgrade to Pro$3.99
  • Remove ads$9.99
  • Pro$12.99
1 purchases

CosmoSia

Subscriptions1
  • CosmoSia Mail Plan(Monthly)7 Days trial$2.991 Month

Questions

Is MailBuzzr for Outlook free?
MailBuzzr for Outlook is free to download, with in-app purchases available.
Is CosmoSia free?
CosmoSia is free to download, with in-app purchases available.
Which has better reviews, MailBuzzr for Outlook or CosmoSia?
MailBuzzr for Outlook is rated higher. MailBuzzr for Outlook averages 4.1 out of 5 from 518 ratings, while CosmoSia averages 1.0 from 1 ratings.
Do MailBuzzr for Outlook or CosmoSia have ads?
Both MailBuzzr for Outlook and CosmoSia show ads.
Which is updated more often, MailBuzzr for Outlook or CosmoSia?
MailBuzzr for Outlook ships an update fortnightly, and CosmoSia every 3 weeks. Most recently, MailBuzzr for Outlook was updated on November 6, 2026 and CosmoSia on November 3, 2026.

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