Durance is free to use on your phone, with no account and no ads. Two things need a subscription: syncing your counters across devices, and using Durance on the web at use.durance.app.
Price
US$4.99 a month, billed monthly and renewing automatically until you cancel.
Free trial
Every new subscriber gets a 14-day free trial. Cancel before it ends and you will not be charged. Each person gets one free trial. On the web, a payment card is needed to start the trial.
The web app
The web app has no local-only mode: you sign in (or create an account) and start your free trial or subscription to use it.
Managing or cancelling
Open Account in the app (or on the web) and choose Manage subscription. If you subscribed through the App Store or Google Play you can also cancel in your store account settings. Cancelling stops the next renewal; you keep access until the end of the period you have already paid for.
Questions
Email brad@durance.app.