Convert hexadecimal strings to ASCII text with a single click.

Calculate the prime numbers between two limits. It uses a deterministic test.

Create sticky notes on the desktop. Hover note for timestamp. 99¢

Add URIs + descriptions to Google using a database for repeat use.

Calculate the factors of any number with a single click. 99¢ only.

Clock display of the amount of time since the computer was booted. 99¢ only.

Calculate total after interest added for any sum with a single click. 99¢

Test any number for primality with a single click. 99¢