Answers to the questions we expect most. If yours isn't here, write to us — the address is at the bottom, and a real person reads it.
Tap the spot in the expression where the mistake is. A cursor appears there, and the keys and the backspace key now work at that point. Tap the end of the line to go back to typing normally.
Press and hold the expression at the top and choose Copy or Paste. In History, press and hold a line to copy its result.
The app uses everyday percent rules: 200 + 10% adds ten percent of 200 and gives 220, and 200 × 10% gives 20. For discounts, tax, markup and percent change, the Percent tool shows each step.
M+ adds the current result to memory and M− subtracts it. MR puts the memory value into what you are typing, and MC clears it. Memory is kept until you close the app. You can hide these keys in Settings.
Check the DEG / RAD chip at the top of the calculator, or Settings → Angle unit. Degrees and radians give very different answers.
No. History is stored only on your phone and clearing it is permanent. Pinned lines are kept when you clear.
No. The app keeps history on the device only and opts out of Android's cloud backup and phone-to-phone transfer. Your purchase does move: use Settings → Restore purchase on the new phone.
Length conversion and the Tip & split tool are free. The other converter categories and tools are part of the one-time unlock. Tap any locked item to see the price.
Settings → Converter categories. Switch off the ones you don't need and they disappear from the Convert tab.
The Loan tool uses the standard payment formula on the amount, rate and term you enter. A lender's figure can include fees, insurance, taxes, or different rounding. Treat the tool as an estimate; your lender's number is the one that counts.
Every converter category, every tool, and pinned, named and shareable history. It is a one-time purchase — not a subscription, and it does not renew. The app has no advertising with or without it.
Open Settings → Restore purchase. That re-checks with Google Play and unlocks it. Make sure the phone is signed in to the same Google account you paid with.
If you paid by a method that needs approval — a cash top-up, or a family "ask to buy" request — Play may still be holding the purchase. Those can take a couple of days to clear, and the app will unlock on its own once they do. Please don't buy a second time.
Refunds are handled by Google Play, not by us — we have no way to issue one. Use Google's refund process. If something in the app is broken, tell us first; we would rather fix it.
No. The app makes no network request of its own, and it has no advertising or analytics. The only thing that involves anyone else is a Google Play purchase. Full detail in the Privacy Policy.
Email support@cypresstech.net — a real person reads it.
Please tell us what you expected to happen and what happened instead, plus your phone model and the app version (shown in Settings → About the App). If you can include a screenshot, even better.