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Reference
Licenses and computers
How Pro is unlocked, the three-computer limit, offline use, and exactly when Pro ends.
- Plan
- Pro
- Reading time
- 4 min read
- Checked against Thoth for Windows on
- October 26, 2026
On this page
Pro is unlocked by a signed license key that Thoth checks on your computer, so it keeps working offline. The website adds accounts and teams, and a count of computers per license.
How do I turn on Pro?#
Two ways, and either is fine. Sign in to Thoth with the account that has Pro (Settings → Plan & license → Sign in with Thoth) and Pro turns on with nothing to copy. Or paste a license key into the same page (Enter license key) and choose Activate. A key from a purchase is on your account page and in your email. A key starts with CT1-.
If you use both, the account’s license is used while it’s valid, and otherwise the pasted key.
How many computers can I use Pro on?#
Three at a time. A license counts the computers it’s active on, so a key (or an account’s license) can be on up to three. On a team, each person who is given a license gets three of their own.
If you see that your license is already in use on three computers, open Billing & license at my.usethoth.app and look under Your computers. Remove a computer you no longer use, then try again in Thoth. A computer you haven’t used for 30 days stops counting by itself. If you can’t reach your old computers, contact support and we can free the places.
Does Pro work offline?#
Yes. A key is checked on your computer, so Pro keeps working without a connection until the key ends. Each time Thoth starts with a connection it checks again within seconds, and then about once a day: it picks up a renewed key, counts the computer, and learns if the license was taken back. A key from a subscription lasts until your paid period ends plus two weeks. The key an account gives the app lasts about a week and is renewed daily. A key you pasted in is also counted against your three computers, which only the website can do, so it needs to hear from the website now and then: if Thoth hasn’t been able to reach it for 14 days, Pro pauses and Settings → Plan & license says why. Connect to the internet and open Thoth and it comes straight back. A key made by hand for a computer that is never online, which the website doesn’t know, isn’t affected and works until its own date.
When does Pro end?#
| What happened | When Thoth notices |
|---|---|
| The key expires | At once, wherever the computer is. The date is in the key. |
| A subscription ends | When the key runs out: your paid period plus two weeks. |
| A team admin takes a license back, or you leave the team | The next time Thoth starts with a connection, and within a week on a computer that stays offline. |
| A key is revoked | The next check with a connection. Thoth turns Pro off and says why on Settings → Plan & license. |
| The computer is offline | Nothing can be told. A pasted key works for up to 14 days since Thoth last reached the website (a key made by hand for offline use, until its date); an account’s key until its week is up. |
When Pro ends, your guides stay on your PC and everything on the Free plan keeps working. Cloud copies and help centers follow the Free plan’s limits.
How do I move Thoth to a new computer?#
Install Thoth on the new one and sign in, or paste your key. Then remove the old computer under Your computers on the Billing & license page. Your guides don’t travel by themselves: see Back up your guides and move to a new computer.
I lost my license key#
It’s on the Billing & license page at my.usethoth.app: choose Reveal to see it or Copy to copy it without showing it. It is also emailed to you. If you were given a key by someone else, ask them for it again, or contact support.
Give every key an end date
Anyone who administers keys by hand should know that a copy pasted into a computer that never connects can’t be recalled before its date.