Primality app icon

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.

by Bruce Schechter★ 4.926 ratingsUtilitiesFreeData updated 2026-09-26

Primality screenshots

Ranked alternatives

Showing 401–420 of 1,000 ranked alternatives.

  1. FF: Depth of Field Calculator app icon

    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.

    ★ 4.023 ratingsPhoto & Video$2.99Data updated 2026-09-09
  1. Days Without app icon

    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.

    ★ 3.33 ratingsLifestyle$1.99Data updated 2026-09-11
  2. PACData app icon

    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.

    ★ 2.02 ratingsProductivityFreeData updated 2026-10-17
  3. Systems of equations solver app icon

    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.

    ★ 1.01 ratingsEducation$3.99Data updated 2026-10-04
  4. Float Hartwell app icon

    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.

    ★ 5.03 ratingsNavigation$2.99Data updated 2026-10-18
  5. Bluetooth Debugger & Inspector app icon

    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.

    ★ 4.619 ratingsDeveloper ToolsFreeData updated 2026-09-06
  6. RPN-45 SD app icon

    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.

    ★ 4.315 ratingsProductivity$1.99Data updated 2026-09-08
  7. RPN-45 HD app icon

    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.

    ★ 4.86 ratingsProductivity$2.99Data updated 2026-09-08
  8. Sekirite app icon

    Sekirite

    Prime Minister's Office, Mauritius

    ★ 0.00 ratingsUtilitiesFreeData updated 2026-09-06

How we rank alternatives

Apps are ranked by functional similarity, category fit, rating confidence, and popularity.