Every plan starts with a 5-day free trial. Cancel before it ends and you pay nothing. Google Play shows the exact price in your own currency before you subscribe.
US$1 a month, after 5 free days
US$2 a month, after 5 free days
Basic is US$1 a month and Pro is US$2 a month in the US. In other countries Google Play converts the price into your currency and rounds it to a local price, and shows it before you subscribe.
Pick Basic or Pro and you get 5 days free. Cancel before the trial ends and you won't be charged. Otherwise the plan renews every month until you cancel. Each Google account gets one trial.
You can't add new entries until you pick a plan. Your data stays on your phone, and you can still export all of it.
Yes, from the plans screen in the app. Upgrading to Pro starts right away and you pay only the difference for the rest of the month. Moving to Basic takes effect at your next renewal.
In Google Play: Profile → Payments & subscriptions → Subscriptions → ControlExpense. Cancel at least 24 hours before the period ends.
Sync pauses. Your encrypted synced copy stays available to restore for 30 days, and is deleted 180 days after Pro ends, after two in-app warnings and an email. Everything on your phone stays put.
No. Use the same Google account and tap Restore purchases on the plans screen.