No OAuth. No servers. Zero network calls.
Gmail One-Click Cleaner Pro, $9.99 once.

Every other inbox cleaner asks you to hand over OAuth access to your Google account, then does the work on their machines. This one is a browser extension. It drives the Gmail tab you are already signed into, on your computer, and it contains no network code at all: no fetch, no XHR, no websockets, no analytics, no license check. You do not have to take that on faith. Grep the zip.

★★★★½ 4.6 stars on the Chrome Web Store 3,000+ installs MIT licensed, every line public

Get Pro - $9.99 lifetime One payment via Stripe. Your key appears right after checkout, activates in one click, and works offline on every browser you sign into. 30-day money-back guarantee.

Check it yourself, in about ten seconds

Download the extension package from the store listing, unzip it, and search the whole thing for the ways code talks to the internet:

grep -rnE "fetch\(|XMLHttpRequest|sendBeacon|WebSocket|EventSource" .

It returns nothing. There is no host permission for any domain but mail.google.com, no identity permission, and no OAuth client, so there is no account to connect and nothing to revoke later. Your Pro key is checked against a public key compiled into the extension, which is why Pro keeps working with the network switched off entirely.

What Pro unlocks

Auto-Pilot Keeps your inbox clean every week, automatically. A scheduled sweep finds the new clutter and archives it: tagged first, archive only, one-click restore, and the very first run is a preview that touches nothing until you approve it.
Bulk unsubscribe Pick every mailing list you never read and leave them all in one pass, using Gmail's own Unsubscribe control. Deleting hides old mail; this stops the new mail.
Storage X-ray purge See exactly which senders eat your storage, then purge the ones you pick in one click. Skip the $20-per-year Google One upsell.
Full Smart Suggestions + bulk apply The complete ranked list of what is worth cleaning and why, applied in one run. The top picks stay free forever.

One payment vs. everyone else's subscription

Tool	Price	After 3 years
Clean Email	$9.99 / month	$359.64
Mailstrom	$9 / month	$324.00
Gmail One-Click Cleaner Pro	$9.99 once	$9.99

Lifetime means lifetime

One payment, every future feature included. Pro started with bulk unsubscribe; Storage X-ray, the full suggestion list and Auto-Pilot were all added later, and every existing key unlocked them on day one. Your key is verified on your device with a built-in public key; the extension never phones home, not even to check the license.

30 days to change your mind

Full refund, 30 days, no interrogation. Email support@secplusmastery.com within 30 days of buying and you get the whole $9.99 back. Worth knowing, since nobody else will tell you: your key keeps working after a refund. Verification happens on your device against a built-in public key, so there is no revocation list and there is no way for me to switch a key off without the extension calling home, which is the one thing it does not do. The guarantee runs on trust in that direction too.