Is there a free trial?

Yes, 15 day free trial where you have access to all features of CMDK.

How many email inboxes can be used?

No limits. You can use it with as many inboxes as you want.

Do you offer refunds?

Yes. We offer refunds no questions asked, if you request a refund within 30 days of starting to use CMDK.

How do I cancel my subscription?

We use Stripe to manage payments and subscriptions, and you can cancel or manage your subscription anytime by visiting the Stripe subscription management portal.

How do you offer lifetime subscriptions?

CMDK is designed to work locally on your browser. This means we have negligible running costs and can afford to offer lifetime deals. We want to pass on the cost advantage to our users, and encourage long-term usage.

Do you have a mobile app?

We don't at the moment. But we have recommendations on the best email mobile apps. Write to us with your most important features and we will personalise the recommendation.

Why do Indian cards not work?

This is because of RBI regulations on the use of Indian cards. Go to the Indian cards payment page to purchase CMDK.

Is there a discount for education and non-profits?

Yes, please write to us at hello@cmdk.email.

Do you accept crypto payments?

Yes we accept stable coins, please write to us at hello@cmdk.email for more details.

Superhuman-level productivity, right inside your Chrome browser

All the features Superhuman you want, right inside your Chrome browser. No separate app. No migration. Just install and go.

CMDK: The Productivity Extension for Gmail

Feature	CMDK	Superhuman
Price	From $9/mo or $169 lifetime	$30/mo ($25/mo annual). No lifetime plan.
Free trial	15 days, no credit card needed	No free trial
Works inside Gmail	Yes (Chrome extension)	No (separate app)
Email providers	Gmail and Google Workspace	Gmail and Outlook
Privacy	Does not read or store your emails	Reads and stores your emails for AI features
Command bar (Cmd+K)	Yes	Yes
Read receipts	Yes	Yes
Reminders & Snooze	Natural language	Yes
Unsubscribe / Nuke spam	One click	Limited (no bulk cleanup)
Keyboard shortcut nudges	Yes	No
Multiple inboxes	Unlimited	Limited
Learning curve	Familiar Gmail UI, instant	2-4 weeks to feel proficient

Why use a Chrome extension instead of a separate app?

Install in 30 seconds

Your Gmail, supercharged

Your emails stay private

No lock-in whatsoever

Common Questions

Is there a Superhuman Chrome extension?

No. Superhuman is a standalone email client, not a Chrome extension. It replaces Gmail entirely with its own app. If you want Superhuman-level productivity as a Chrome extension that works inside Gmail, CMDK is the closest match with command bar, read receipts, shortcuts, reminders, and split inbox.

Can I use Superhuman inside Gmail?

No. Superhuman requires you to leave Gmail and use their separate app. CMDK is the alternative: it is a Chrome extension that adds Superhuman-style features (Cmd+K command bar, keyboard shortcuts, read receipts) directly inside your existing Gmail interface.

What is the best Gmail productivity Chrome extension?

CMDK is the highest-rated Gmail productivity extension with a 4.9/5 rating from 1000+ users. It adds 80+ keyboard shortcuts, a command bar, natural language reminders, read receipts, split inbox, and one-click unsubscribe directly into Gmail.

Will a Chrome extension slow down Gmail?

No. CMDK is lightweight and designed for performance. It enhances Gmail without adding bloat. Unlike Superhuman which is a full separate application, CMDK only activates the features you use.

Can I keep my other Chrome extensions with CMDK?

Yes. CMDK works alongside other Gmail extensions like Grammarly, Streak, Boomerang, and others without conflicts. Superhuman replaces Gmail entirely, so your other Chrome extensions will not work with it.

Does Superhuman read my emails?

Yes. Superhuman reads and stores your emails to power AI features like auto-drafting replies. CMDK does not read or store your emails. It runs locally in your browser and only accesses Gmail to perform actions you initiate.

Which browsers does CMDK work on?

CMDK works on Chrome and all Chromium-based browsers including Brave, Edge, Arc, and Opera. It does not currently support Firefox or Safari.

Is there a free Gmail extension like Superhuman?

CMDK offers a 15-day free trial with full access to all features, no credit card required. After the trial, it starts at $9/mo or $169 for lifetime access. Superhuman has no free trial and costs $30/mo.

Have people actually switched from Superhuman to CMDK?

Yes. Hundreds of Superhuman users have switched to CMDK. One user said: "I was paying a massive monthly subscription just for a clean interface and fast keyboard shortcuts. CMDK provides the same Inbox Zero experience and speed for a fraction of the cost." Another said: "It doesn't force you to use all of the latest AI tools that I never wanted or needed. Kind of the best of all worlds."

Have more questions? Contact Us ›

Wall of love

Loved by customers all across the world

Nice app. I like Gmail UI, but the shortcode options of Superhuman. So your app is the best of both worlds!

Superhuman for Chrome | CMDK - Gmail Productivity Extension

Brian Dainis

Literally the best email extension you could get. Amazing alternative to Superhuman. Super clean and just works. Definitely worth the price and they are super responsive to feedback.

Danny Nielsen

Solid extension that provides many of the key benefits of MUCH pricier tools. Even better that this lives in Gmail, so you can use other extensions as well.

Zachary Eisenstat

Great - simple as it says, but adds a bunch of convenient time saving features. I don't need a full on client, I just need my Gmail to be fast, and this does it.

Dilip Goswami

Really good and helpful. And the developer was even very responsive to feedback!

Dominic Roser

This is awesome. It massively speeds up and simplifies usage of Gmail. Great pricepoint too, and the developer is super active and amazing at feedback and improvements.

Brent Maxwell

Love it! This extension helps me fly through my emails so I can get out of my inbox and back to revenue producing work. And great support!

Bill Brelsford

Works like a charm! Exceptionally GREAT SUPPORT - even for as small language as Hungarian. It can totally replace Superhuman.

Zoltán Szabó

I have started using CMDK as a layer over my gmail. Once I got used to it I love it. CMDK provide real-time support - most impressive!