Combinations

combinations with repetition↔combination without repetition↔number of combinations↔binomial coefficient↔etc.

Calculator generates list of possible combinations (with or without repetition) based on entered pool of items.

Frequency generator

sine↔square↔sawtooth↔triangle↔etc.

Generates sound with specified frequency and waveform type (sine, triangle etc.).

Mongo Object Id

mongo↔object id↔;timestamp↔random value↔incrementing counter↔etc.

Calculator decodes (splits) your mongo object id into separated unix timestamp, random value and incrementing counter parts or encodes (generates) new mongo-id.

Nano ID generator

nano ID↔NaN0-1D↔generator↔alphabet↔length↔etc.

Calculator generates nano ID sequences with desired length and pool of characters used (alphabet).

Permutations

permutations with repetition↔permutations without repetition↔n!↔number of permutations↔etc.

This calculator generates list of possible permutations (with or without repetition) based on entered pool of items.

Polish PESEL generator

poland↔pesel↔random generator↔date of birth↔age↔etc.

Calculator generates random PESEL numbers (unique ID assigned to each person in Poland) matching given criteria such as date of birth, age range or gender.

Random numbers

random numbers generator

Generates random numbers and texts. You can use this calculator to generate random passwords.

UUID/GUID generator

UUID↔GUID↔universally unique identifier↔global unique identifier↔generator;v1↔v3↔v4↔v5↔etc.

Calculator generates UUID/GUID numbers. The versions v1, v3, v4 and v5 are supported.

Variations

variations with repetition↔variations without repetition↔n-tuples↔k-permutations of n↔etc.

Calculator generates list of possible variations (with our without repetition) based on entered pool of items.