GCM Mail vs SimpleMail by WK
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
GCM Mail
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GCM Mail – One Inbox. All Your Accounts. GCM Mail brings all your emails together in one powerful, secure, and beautifully designed app. Connect your Gmail, Outlook, Hotmail, Office 365, Exchange, and other IMAP or POP3 accounts — and manage everything seamlessly in a single inbox.
SimpleMail by WK
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SimpleMail is a fast, private email client for iPhone and iPad. Connect any standard IMAP/SMTP account and get real-time new-mail notifications, folders, search, attachments, and compose with signatures. Read messages in light or dark, in English or Korean. Your email data stays on your device. SimpleMail talks directly to your mail server over TLS, and passwords are stored only in the system Keychain. The app displays advertising and requests App Tracking Transparency permission before initializing the advertising SDK. Features - IMAP + SMTP for any standard mail provider - Real-time push via IMAP IDLE - Folders, server-side search - Swipe to delete, junk, mark read/unread, flag - Compose with signatures - View and share attachments - Light / Dark message rendering - English & Korean
Screenshots
Verdict
The clearest difference is ads: GCM Mail at none against SimpleMail by WK's shown. GCM Mail also leads on update cadence (every 5 days vs fortnightly) and iOS requirement (13.0 vs 17.0). On price, in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
GCM Mail ships an update every 5 days, SimpleMail by WK fortnightly. The most recent releases landed on October 5, 2026 and October 18, 2026 respectively.
| Parameter | GCM Mail | SimpleMail by WK |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 5 days — better | Fortnightly |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 31 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | GCM TECH SOLUTIONS | Wonkyoung Seo |
In-app purchases
GCM Mail
No in-app purchases
SimpleMail by WK
No in-app purchases
