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Our mission at is to increase awareness of Jewish holidays and to help Jews to be observant of the mitzvot.

Here are three ways to show your appreciation:

Send money to

This is a free service. Please help defray the cost of our Internet hosting bill. Note: donations to are not tax-deductible. The website is developed and maintained by Michael Radwin, a private individual.

Donate to @Michael-Radwin via Venmo (last four digits of mobile phone 2475)

Donate via Payal:

Send money to Danny Sadinoff

Send money to Danny Sadinoff, author of hebcal for UNIX (which helps to power the website).

Donate your software engineering or design skills

Contribute to the development of hebcal by sending GitHub pull requests! We’re part of the Open Source Judaism movement.