Comparison

mail.com vs OSO+

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

Head to head
About

mail.com

Manage your emails and cloud storage from a single app. Receive instant notifications for new messages and access your contacts and documents on the go. Secure your account with PIN or biometric authentication.

Highlights
  • Unified inbox for all email addresses
  • 2GB cloud storage
  • Push notifications
  • PIN or biometric authentication
  • Automatic photo backup
  • Contact synchronization
Features
Read full description

The mail.com mail app for iPhone and iPad lets you take your email and cloud wherever you go. The mail.com mail app brings comprehensive functionality to your mobile device. Perfect for iPhone and iPad users, the email app from mail.com puts a wealth of productivity tools directly into your hand. Check all your email addresses and view your cloud documents from one centralized mailbox – wherever you go. Enable push notifications to ensure you never miss an important message again. Discover the many features of the mail.com email app and get your emails whenever you need them, wherever you are. What customers are saying: "Everything you could wish for. Simply open, read, delete, done. No frills or 1000 options to subscribe or play. Thanks" "Good stuff. The way email should work today!" "Cool. I have been using this app for such a long time and I would not change." "Best email account in the world. Thank you" "Great app! Convenient, easy to navigate" Reliable and secure e-mail The mail.com email app is optimized for use with a mail.com email account by 1&1. With an mail.com email account you can select from our 100+ email domains, like @email.com and @usa.com. Ideal for business emails, our mail app lets you set personalized notifications and use many organizational features that our webmail solution provides. This means you can easily access your mail.com contacts and synchronize them with the contacts on your iPhone. The mail.com email client for iOS enabled devices also includes powerful security features to ensure your communications are never compromised. The email app for iOS is simple to install and intuitive to use. You can even make it the default mail app on your iPhone. This makes managing your mails a breeze – giving you the opportunity to write, reply and organize your mail wherever you go. Syncing your inbox between multiple devices is also possible, allowing you to move seamlessly from your iPhone to your iPad without breaking your concentration. Cloud storage and emails in one With mail.com freemail you also get 2GB of reliable cloud storage. Store e-mail attachments, photos, documents and more in your mail.com Cloud and your online file manager is right at your fingertips in this combined e-mail and cloud app. The app will automatically sync not only every message in your inbox but all the files in your cloud storage, so you can access them whenever and wherever you are online. Just open the app and get started! You can even activate automatic photo backup from your iPhone or iPad to your mail.com Cloud and keep your precious memories safe in our secure online storage. All you need to do is sign up for a freemail account from mail.com and download the app to enjoy these gr eat features: • iPhone optimized • Convenient push notifications • Increased security through PIN or biometric authentication • Mobile access to your mail.com contacts • Integrated cloud with automatic photo backups • Customizable interface • 100+ email domains available to create email address of your choice • Sync automatically with mail.com web browser email client • Set as default mail app on iPhone or iPad • Convenient folder and file manager in Cloud 100+ email domains One of the best things about using the mail.com app as your iPhone email app or iPad email app is creating unique email addresses. Customize your email address with our 100+ email domains. In addition to our @mail.com domain, here are just five of the available email domains that we offer: 1 @email.com domain 2 @usa.com domain 3 @post.com domain 4 @techie.com domain 5 @dr.com domain Feedback welcome! We’d love to hear what you think and we welcome your feedback and user experiences with the iPhone and iPad app. Contact us today and help us improve your email experience. Terms & Conditions: https://www.mail.com/company/terms/

About

OSO+

This app acts as an emotional GPS, helping you quickly record and understand your feelings. By practicing emotional awareness, you can improve your communication skills and achieve more harmonious and productive outcomes in personal and professional life. All your data is kept private on your device.

Highlights
  • Emotional awareness tracking
  • 3D emotion input (Happiness, Energy, Assuredness)
  • Private data storage on device
  • Visual information display
  • Elegant design
  • Improve social and emotional intelligence
Read full description

Everything in life is either KRONsense or NONsense. 
 Your heart knows whether something is wasting your time (i.e., NONsense) or adding to your life positively (i.e., KRONsense), and your heart lets you know through the emotions you feel. Practicing emotional awareness is an important life skill.
 If you find yourself resonating with the above, and you also gravitate toward visualizing information and appreciate elegant design, this is the App for you. How can I conceptualize the OSO+ App? Think of your OSO+ App as your emotional GPS. Why should I use the OSO+ App? In other words, what are the potential benefits? Emotional awareness has gained significant importance in our culture. OSO+ App offers you a super quick and easy way to record how you feel whether you are angry, sad, relaxed, madly in love, and everywhere in between. Use your OSO+ App to focus on your emotion. Studies from Harvard University and other scientifically highly regarded research have shown that having heightened awareness and understanding of one’s own emotion has strong positive correlation with one’s improved ability to communicate in relationships at home and in the professional work place. As you practice frequently and become more aware of your own emotions overtime, your social and emotional intelligence will improve, which will result in more harmonious and productive outcomes for yourself and for the people around you to achieve personal and team goals. How about my data privacy? The OSO+ App is completely private - all your OSOs stay on your iPhone under the protective shield of Apple’s security systems. Where does the name OSO come from? Our app and technology is affectionately named OSO, meaning bear in Spanish and pays tribute to Cloudbear - our Great Pyrenees and beloved family member - known for his boundless love and vigilance against predators. Cloudbear's mission to passionately love and protect deeply inspires us. Our Spanish speaking friends and strangers alike call Cloudbear “oso” given his striking resemblance to a polar bear. What is the technology behind the OSO+ App? The OSO+ App is powered by the new and proprietary OSO-Pearl technology from the KRONxArc / Nectelier Team. How does the OSO-Pearl Technology work? Touch the OSO-Pearl interactive area to record your emotion in 3 dimensions: x, y, and z, for happiness (H), energy (E), and assuredness (A), respectively. For example, if you feel happy, your OSO Mark would be on the right half of the OSO-Pearl because that's the "+" side of the x-axis; if you feel your energy is elevated, your OSO Mark would be on the top half of the OSO-Pearl because that's the "+" side of the y-axis; if you're very sure about how you feel, tap multiple times to mark your OSO to express your certainty - this increases your assuredness which is the z-axis value. What is the lexicon of the OSO+ App? When using the OSO+ App, we think of the word 'OSO' as a noun, verb, or an adjective. For example, capturing an emotion with the OSO+ App can be described as creating an OSO. The action of engaging with the App is called OSO-ing. The OSO also refers to the interactive area that resembles a pearl. Your creation, i.e., the OSO-Pearl with the "OSO Mark" that you'll have marked is called your OSO. Imagine thinking or asking "How's your OSO?" as a way to show you care. When a topic or subject (words, phrase, image, etc.) has been OSO'ed by someone, it shows this subject is worthy of being OSO'ed and worthy of the user's time and efforts.
 Where can I find App Terms of Use, Privacy Policy, Tutorials and more? We follow the Apple standard Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Check out our website http://www.kronarc.com/oso for more as well as links to a number of "How's Your OSO" video tutorials. How can I reach the OSO+ App team? User requests and feedbacks are our priority - reach us via support@kronarc.com Time to start OSO-ing, enjoy!

Screenshots

mail.com4 screens
OSO+4 screens

Verdict

The call

The clearest difference is price: mail.com at Free against OSO+'s $19.99. mail.com also leads on ratings volume (105K vs 6) and update cadence (fortnightly vs every 2 months). OSO+'s advantage is ads (none vs shown) and review sentiment (100% vs 76%). On in-app purchases, monetization model 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

CostPrice · In-app purchases · Ads · Monetization

mail.com is free to download; OSO+ costs $19.99 up front. mail.com sells 6 in-app purchases, starting at $0.99 per month and OSO+ sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

OSO+ holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: mail.com has 105K ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 76% of mail.com's written reviews are positive against 100% of OSO+'s.

UpkeepUpdate frequency

mail.com ships an update fortnightly, OSO+ every 2 months. The most recent releases landed on October 20, 2026 and October 12, 2026 respectively.

Scorecard7 real differences · 3 level
mail.com versus OSO+: the parameters behind the verdict, then further details
Parametermail.comOSO+
PriceFree — better$19.99
Rating4.7 (105K ratings)5.0 (6 ratings) — better
Positive reviews75.5% of reviews100.0% of reviews — better
Number of ratings105K — better6
Update frequencyFortnightly — betterEvery 2 months
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPadiPhone, Apple Watch
Requires iOS18.016.2 — better
Further details — not scored
Size356 MB164 MB
Age rating4+4+
Developer1&1 Mail & Media Inc.Nectelier Inc.

Customer experience

mail.com

All ratings104,992 ratings
Positive93.4%
Neutral3.1%
Negative3.5%
Written reviews1,709 reviews
Positive75.5%
Neutral5.9%
Negative18.5%

OSO+

All ratings6 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

mail.com

Reported bugs

4 issues
  • Emails not loading properly
  • Inability to delete or move emails
  • Sync issues between app and web version
  • Frequent app crashes or freezes

Requested features

5 requests
  • Improved email organization and folder management
  • Option to disable ads in free version
  • Enhanced search capabilities
  • Ability to attach various file types
  • Customizable email signatures

OSO+

Not enough reviews yet to summarise bugs or requests.

In-app purchases

6 purchases

mail.com

Subscriptions6
  • 25 GB3 variants$0.991 Month
  • adfree App$1.991 Month
  • 150 GB2 variants$2.991 Month
Show 3 more
  • 250 GB2 variants$3.991 Month
  • mail.com Premium$3.991 Month
  • mail.com Premium$29.991 Year
2 purchases

OSO+

Subscriptions2
  • OSO Premium Monthly Membership$9.991 Month
  • OSO Premium Yearly Membership$83.001 Year

Questions

Is mail.com free?
mail.com is free to download, with in-app purchases available.
Is OSO+ free?
OSO+ costs $19.99, and also offers in-app purchases.
Which has better reviews, mail.com or OSO+?
OSO+ is rated higher. mail.com averages 4.7 out of 5 from 105K ratings, while OSO+ averages 5.0 from 6 ratings.
Do mail.com or OSO+ have ads?
mail.com shows ads; OSO+ does not.
Which is updated more often, mail.com or OSO+?
mail.com ships an update fortnightly, and OSO+ every 2 months. Most recently, mail.com was updated on October 20, 2026 and OSO+ on October 12, 2026.

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