App for Gmail SMS etc：CosmoSia

株式会社ACCESS

Contains adsIn-app purchases

About this app

CosmoSia is the best simple client application for email, SMS, and MMS which can manage your mailbox easily.
CosmoSia is a messaging application for sending and receiving email and SMS with the ability to serve as the default SMS handler.
*CosmoSia must be set as the default SMS application in order to use SMS.


- Just tap! The all-new "Reactions" feature
Get your feelings across without words: Just like in a chat, react to emails with emoji such as "👍", "❤️", and "👏".

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.


CosmoSia is the best replacement for your email or SMS client app because it supports all major email services, SMS/MMS and any other IMAP4 or POP3.
- Gmail
- Hotmail
- Yahoo mail
- AOL
- iCloud
- Outlook
- GMX
- Exchange
- SMS
- MMS

Easy to start
We provide a set for easy setting especially for Gmail, Outlook, Hotmail and SMS. You can start using it immediately.

Easy to use
CosmoSia love simplicity and are committed to make your email easy to read.
We do not provide the complicated functions that other mailers do.

Simple Client
CosmoSia is a simple mail client application that does not use an intermediate server.
We declare that it is structurally impossible for us to see any user's ID, account info, password or email body.
You can use CosmoSia app without concern that your information is being seen in the mailer service.

Animation Emoji
With CosmoSia, you can insert Emoji icons in emails.
Decorate your email and enjoy it!


We LOVE hearing your feedback and are so thankful for everyone supporting CosmoSia.
If you need any help, please contact us from [e-mail] anytime.

Ratings and reviews

i don't know why it's not opening, it was pre-installed in my Huawei phone and i think it might be useless app. i can't delete it but can't use it either , it's just taking my space

Its very easy to find my emails massage its save more time for me its very fast i love it

Useful app and Reliable.

What’s new

August 12 2026 | v4.18.2

🎉Introducing "Reactions"! Make replying to emails easier and more fun. Send a quick "Got it," "Confirmed," or "Thanks" to the other person with a single tap — no need to write out a message. Backed by our proprietary patented technology (patent granted), it lets you expand your circle of communication safely and securely.

May 27 2026 | v4.17.3

- Fixed some bugs.

April 23 2024 | v4.15.0

- Now supports Android 14.
- Added 10 new rich templates.