Apps Like Primality for iPhone and iPad
Check if a number is prime
Determine if a number is prime or list its prime factors. Input any integer between 0 and 999,999,999,999. Identify the prime ordinality of a prime number, showing its position in the sequence of primes.
Primality screenshots
Ranked alternatives
Showing 401–420 of 1,000 ranked alternatives.



FF: Depth of Field Calculator
Lukas Schmidt
Calculate of for any camera
Calculate focus distances and blur levels for objects in photos or videos. Input camera settings and lens details. Visualize -of- with intuitive diagrams. Supports multiple camera models and includes precision mode for advanced adjustments.





Days Without
Buzz Media
Track multiple goals and progress.
The app helps users track progress toward multiple goals. Users can set a start date for any goal and choose between manual or automatic tracking.

PACData
Automationdirect.com
Monitor PLC values in real time.
The app monitors discrete and integer values within a PLC and accesses alarm and event history. It offers a security logon for data protection and utilizes the iOS Zoom feature for screen captures.

Systems of equations solver
Intemodino Group s.r.o.
Solve linear equations with two variables.
The app solves systems of linear equations with two and three variables. It shows step-by-step solutions and supports various coefficient types, displaying results as decimals and fractions.


Float Hartwell
True Course Ventures LLC
Navigate Lake and save favorites
Navigate Lake with detailed maps and points of interest. Find marinas, boat launches, restaurants, and other locations. Save favorites for quick access. Create custom places on the map. Share saved spots with friends.





Bluetooth Debugger & Inspector
小玲 王
Discover devices and inspect services
Scan and locate devices. Assign custom names and icons. Track device locations. Send data automatically. Manage messages quickly. Update firmware. Monitor signal strength. Connect to devices. Read device information. Write and read data from devices.

RPN-45 SD
Willy Kunz
Calculate with scientific precision and enhanced functions
Simulate the HP-45 scientific calculator with photo-realistic visuals and original LED or LCD display. Print calculations, animate keys with sound and feedback, and replicate the calculator's computation times.

RPN-45 HD
Willy Kunz
Calculate like a scientific calculator
Simulate the HP-45 scientific calculator with photo-realistic visuals and animated keys. Perform all original functions and operations. Access a secret timer for 12-hour or 100-hour intervals. Switch to Super-45 mode for enhanced capabilities.

How we rank alternatives
Apps are ranked by functional similarity, category fit, rating confidence, and popularity.