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Tiers & Upgrading

Sentinel Circle has two tiers: Free (the 30-day trial, limited to a small number of active items) and Standard (a one-time purchase, no limits). Upgrading is a single purchase, not a subscription — you pay once and keep it permanently.

Details​

Free Trial​

  • Up to 3 sensors, 2 channels, and 1 monitor enabled at a time.
  • This limit is on enabled items, not total items — you can always add more than your limit, the extra ones just start out disabled until you either free up a slot or upgrade.
  • See The Free Trial for what happens as the 30 days run out.

Standard Tier​

Upgrading removes all limits: unlimited sensors, unlimited channels, unlimited monitors. It's a one-time purchase, not a subscription — you pay once and keep the tier permanently, with no recurring charge.

How to Upgrade​

The "Upgrade to Standard" card at the top of Settings on the Free tier

  1. Go to Settings (gear icon on the Status screen).
  2. Tap the "Upgrade to Standard" card at the top. (The Upgrade button in the free-trial notice on the Status screen does the same.)
  3. A dialog shows the price before anything else happens, in your own currency, with the currency code spelled out, e.g. "$9.99 (CAD)". It also tells you how tax is handled:
    • US and Canadian dollars: the price is before tax; Google Play adds any applicable tax at checkout, based on your billing address.
    • Euro, pound, Australian dollar and similar: the price already includes tax.
    • Any other currency: Google Play may add applicable taxes at checkout.
  4. Choose a price and tap Buy. You are taken to Google Play, which handles the entire payment; confirm there. Sentinel Circle never sees your payment details.
  5. After purchase, all limits are lifted immediately, and you can enable any previously disabled sensors, channels, or monitors.

Choosing a price​

The upgrade dialog offering the full price, recommended and selected, and a reduced price

At times Standard is offered at two prices. Both unlock exactly the same features. There is no difference at all in what you get.

  • The full price is selected by default. If Sentinel Circle is valuable to you and you can afford it, choosing it supports the app's continued development.
  • The reduced price is there for anyone for whom the full price is a stretch. Choose it freely: you get the same Standard tier, permanently.

When no reduced price is on offer, the dialog shows the single price:

The upgrade dialog showing a single price with its currency code

If the dialog says the prices could not be loaded, check your internet connection and tap Retry.

About Payment​

Sentinel Circle does not process payments directly. When you tap Upgrade, the Google Play Store handles the entire transaction — your payment method, pricing, receipts, and refunds are all managed by Google, not by this app. If you reinstall the app or switch devices, your purchase is automatically restored through your Google account — there's no separate "Restore Purchase" button to look for, and no need to buy again. This holds whichever price you paid, including a reduced price that is no longer on offer.