One time purchase until the next major upgrade, then you need to pay more to stay up-to-date.
My name is Eva Schweber and I work for AgileBits, the folks who make 1Password.
While it is true that we think it is important for our potential customers to know that we may charge for a future version of 1Password, we have only done this once in the 9 years that 1Password has been available. And that was after a significant upgrade from 1Password 3 to 1Password 4 when we rewrote the entire app from scratch.
Customers who purchased 1Password 4 for iOS have received free upgrades (including Pro Features) to 1Password 5 and 1Password 6. The same is true for our 1Password 4 for Mac customers, who received 1Password 5 (our current version) for free.
My name is Eva Schweber and I work for AgileBits, the folks who make 1Password.
For Windows you are eligible for an existing customer discount. Just go to our store at http://agilebits.com/store and click on the Upgrade button under the license you are wanting to purchase. You will be prompted to enter your 1 Password 3 license code and then you will see the discounted prices you are eligible for.
We have also changed our sharing policies to match Apple's Family Sharing plan. Now a family living in a single household can have up to 6 users on a single 1Password for Mac or Windows license.
As far as Android goes, we have put the in-app purchase on sale for 40% off.
My name is Eva Schweber and I work for AgileBits, the folks who make 1Password.
To answer your question, yes it does.