Last updated 08-12-2026
Category:
Reviews:
Join thousands of AI enthusiasts in the World of AI!
CMDK (formerly Simplehuman)
CMDK is a Chrome extension that layers Superhuman-style keyboard shortcuts, read receipts, and inbox tabs onto Gmail without replacing the Gmail UI. Hit Cmd+K for a command bar, split work and personal mail into custom tabs, snooze threads in plain language, and block marketing senders with one click.
Dedicated email clients like Superhuman charge around $30 per month and lock you out of other Gmail extensions. CMDK stays inside Gmail, runs locally in the browser without reading or storing your mail, and offers plans from $9 per month plus a lifetime option. The product rebranded from Simplehuman to CMDK in 2026 while keeping the same feature set.
It fits founders, sales reps, and support leads who live in Gmail and want faster triage without switching apps. A 15-day free trial covers all features, and the Chrome Web Store listing works on Mac, Windows, and Linux.
Cmd+K command bar covers archive, label, compose, and navigation without the mouse
Read receipts track opens and re-opens on sent Gmail messages
Custom inbox tabs split work, personal, and project email with Tab-key cycling
Natural-language snooze: hit B and type when you want the thread back
25+ Gmail hotkeys plus nudges that teach shortcuts when you reach for the mouse
15-day free trial with no credit card required
Keeps the Gmail interface you already know while adding Superhuman-like speed.
Local browser processing avoids sending mailbox content to a third-party server.
Lifetime plan option suits users who dislike recurring email SaaS fees.
Chrome extension only; no dedicated mobile app for on-the-go triage.
Snippets feature was marked coming soon on the pricing page at research time.
Yearly and lifetime prices are not listed publicly on the marketing page.
What is CMDK?
CMDK is a Chrome extension that adds read receipts, keyboard shortcuts, inbox tabs, and snooze tools to Gmail. It rebranded from Simplehuman in 2026 and runs locally in your browser without storing your email content.
Does CMDK have a free trial?
Yes. CMDK offers a 15-day free trial with full feature access and no credit card required. After the trial you can choose monthly, yearly, or lifetime plans.
How much does CMDK cost?
CMDK pricing starts at $9 per month on the Monthly plan. Yearly and lifetime options are also available on the CMDK pricing page, with lifetime billed as a one-time purchase.
Does CMDK read my emails?
No. CMDK states it does not read or store your emails. Processing happens locally in the browser, and the extension is designed to work alongside other Gmail add-ons.
How many Gmail accounts can CMDK use?
CMDK supports unlimited Gmail inboxes on one account. You can switch between Google accounts with hotkeys or the command bar.
Is CMDK only for Chrome?
CMDK installs from the Chrome Web Store and works on Mac, Windows, and Linux browsers that support Chrome extensions. CMDK does not offer a native mobile app.