Features Users Want Most in Pet Calculator Apps

"Overall it is a good calculator but one thing that is a must is support for putting in equations all at once and not one by one, for example solving physics problem such as : 6.64^-31 x 8.7^-31 and we can put that problem at once please add it."

"Was not able to even input my equation. A TI-83 would do a better job. Has the same frustrating interface as the stock calculator app where it will solve the equation as you go- instead of letting you the in the expression in full."

"This calculator does not appear to support 64 bit hex calculations, so I just wasted 9.99, since a calculator that does not support 64 bit is worthless to me."

"I need a 64-bit hex/binary calculator now and may well need 128-bit within a year or two."

"I bought the app based on the reviews comparing it to the HP 48G. After I bought one of the first things I did was take the square root of -1, it gives an error. If you don't need functions of complex numbers and like RPN then maybe?"

"Such a great calculator, so many options, I really wish I could use it. There is no support for displaying numerals in inches/feet. You can put things in fraction mode, but it gives you answers outside of base 32 like 4/5ths which is really not helpful"

"unacceptable, premium scientific calc wont simultaneously show tape and calculator function at once(common feature). app is worthless to me, waste of money"

Build a calculator with full equation input mode that allows users to type complete expressions before calculating

Multiple users explicitly request this feature and compare negatively to stock calculator's sequential solving. This is a fundamental UX difference that frustrates engineers and students who need to input complex equations.

Create comprehensive in-app documentation with video tutorials and searchable help

The #2 complaint is lack of documentation. At $10 price point, users expect professional documentation. This is an easy differentiation point that PCalc has completely neglected.

Implement true 64-bit and 128-bit support for programmer mode with proper hex/binary handling of negative numbers

Developers are a premium-paying segment being underserved. Current 48-bit limitation makes the app 'worthless' for modern development work. This creates a clear niche opportunity.

Design with state persistence - never clear calculator when app backgrounds, maintain history across sessions

Mobile users constantly switch between apps to gather data. Clearing the register when backgrounded destroys workflow and is a solvable technical problem that frustrates users.

Single transparent pricing model - one purchase unlocks everything forever with cloud restore

Users paying $10 are outraged by additional paywalls. A clear 'pay once, get everything' model with reliable restore builds trust and justifies premium pricing better than nickel-and-diming.