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Screenshots

  • CosmoSia screenshot 1
  • CosmoSia screenshot 2
  • CosmoSia screenshot 3
  • CosmoSia screenshot 4

About CosmoSia

Recommended for those who are considering moving away from carrier email. You can create "[email protected]" 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 [email protected]. You can use email addresses such as [email protected]. 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 ([email protected]). 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.

What’s new

Version 1.10.4 · Updated September 9, 2026

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. Fixed some bugs.

App privacy

The developer, ACCESS CO., LTD., reported these privacy practices to Apple.

Data Used to Track You

The following data may be used to track you across apps and websites owned by other companies:

  • Location: Coarse Location
  • Identifiers: Device ID
  • Usage Data: Product Interaction, Advertising Data
  • Diagnostics: Crash Data, Performance Data

Data Linked to You

The following data, which may be collected and linked to your identity, may be used for the following purposes:

  • Location: Coarse Location
  • Identifiers: Device ID
  • Usage Data: Product Interaction, Advertising Data
  • Diagnostics: Performance Data

Used for: Third-Party Advertising, Analytics

Data Not Linked to You

The following data, which may be collected but is not linked to your identity, may be used for the following purposes:

  • Diagnostics: Crash Data
  • Identifiers: User ID
  • Contact Info: Email Address, Name
  • Contacts: Contacts

Used for: Third-Party Advertising, Analytics, App Functionality

Alternatives to CosmoSia

Looking for apps like CosmoSia? Here are 6 similar apps on the App Store. The highest rated is Preside email (4.8/5), and all 6 are free to download.

CosmoSia vs. alternatives
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CosmoSia 1.0 / 5 (1 rating) Free September 9, 2026
Mic Tune : Real-time Autotune – Free Oct 22, 2026 Compare
Preside email 4.8 / 5 (185) Free Jan 12, 2026 Compare
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Email.cz 4.6 / 5 (58) Free Oct 15, 2026 Compare
OneMail - Email by Nouvelware 4.4 / 5 (298) Free Jul 14, 2024 Compare
black.com - Encrypted Email 3.7 / 5 (12) Free Jan 15, 2026 Compare

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