Premium browser extension
Cosmic Scale, offline and ad-free
Keep the large-number explorer one click away in Chrome or Edge. The extension includes the same Conway-Wechsler naming engine, long-scale comparison, SI prefixes, digit sandbox, speech, and universe-scale facts without website ads.
Secure checkout by Lemon Squeezy. One-time payment, lifetime access.
What the license unlocks
- Offline use: launch from your toolbar after activation.
- No ads: the extension has no advertising or analytics scripts.
- One-time purchase: a perpetual personal license verified with Lemon Squeezy.
- Local-first: number calculations happen on your device.
For teachers
Open the explorer during lessons without relying on a website tab or ad-supported page.
For writers
Check names for gigantic powers of ten while drafting science fiction, puzzles, or references.
For curious minds
Compare short scale, long scale, SI prefixes, and magnitude facts from one compact popup.
Advertisement
Install & activate in 3 steps
- Buy a license. Use "Buy one-time license" above. Lemon Squeezy emails your license key right after checkout.
- Install the extension. Add Cosmic Scale from the Chrome Web Store or Edge Add-ons, then pin it to your toolbar.
- Activate. Click the toolbar icon, paste your key, and choose "Unlock Tool". It works offline from then on.
Your key is stored locally and re-verified on launch through the Cosmic Scale license proxy; no browsing data is transmitted. New device? Re-enter the same key (each key allows a limited number of activations).
Store reviewers: a working test license key is provided in the submission notes so the gated extension can be evaluated.