Folx is available for a one-time purchase, not as a subscription. However, please note that there are minor and major updates to the software.
Minor updates are provided for free, while major updates can be purchased at a 50% discount. If you bought a license shortly before a major update, you'll receive the new version of the software free of charge.
Additionally, to avoid paying for major upgrades in the future, you can add a Lifetime Upgrade Guarantee when buying the software.