How can I help?

Press MODE and select Graph mode, then press Y= to open the graph editor and enter your functions. Press GRAPH to draw them. Calc84 supports function, polar and parametric graphs.

Once a graph is drawn, you can trace it, find intersections, roots and extrema, show derivatives and tangents, open a TABLE of values, or use CALC for the min, max, d/dx and integral of the selected graph.

Press ALPHA then ENTER to open the SOLVER menu. Auto Solver mode works for most equations and can give exact, symbolic roots. There are also dedicated solvers for quadratic, cubic, quartic and quintic equations, and for systems of equations with up to 5 variables.

Yes. Math OCR lets you input an expression with your device’s camera or from your photos. Snap a picture of a handwritten or printed equation and Calc84 converts it into editable text you can work with.

Premium unlocks all of Calc84’s features, including advanced math functions, statistics, inferential statistics and distributions. You can choose a monthly subscription, a yearly subscription or a one-time lifetime purchase. Prices are shown in the app in your local currency.

Subscriptions are managed by Apple, so you cancel them from your device rather than in the app:

1. Open the Settings app and tap your name.
2. Tap Subscriptions, then choose Calc84.
3. Tap Cancel Subscription.

Cancel at least 24 hours before the end of the current period to avoid being charged again. You keep Premium until the period ends, and then Calc84 returns to the free version.

Calc84 runs on iPhone, iPad and iPod touch with iOS 15 or later.

Email tranleduy1233@gmail.com. For bugs, the exact expression or steps that caused the problem make it much easier to fix.