Demoz Calculator

Yes, it does, but it's hidden behind a small icon. In our tests, it saved previous calculations, so you can go back and check numbers from a prior session, but it's not the most intuitive to find.

Absolutely. The app has a clear button to toggle between standard and scientific modes, so you can access basic or more advanced functions. Just note that the scientific mode is fairly bare-bones and may not satisfy heavy math users.

The app is ad-heavy, with a full-screen ad on launch, persistent banner ads, and occasional video ads that play with sound. Based on the review, there doesn't seem to be a paid option to remove ads, so you'll have to tolerate them or look elsewhere.

This is a known issue where the app sometimes goes blank or shows an error, wiping your calculation. Try tapping buttons dead center to avoid missed presses, and if the problem persists, contact support with your phone model and Android version—they do respond, though it may take a few days.

The stock Samsung calculator is much more reliable and ad-free, with smoother button response and no surprise video ads. Demoz Calculator's only potential edge is its history feature, but given its janky performance and intrusive ads, the default app is a far better choice for everyday use.