Kol Yaakob is an iPhone app developed by the Sephardic Heritage Foundation Inc. It serves as the official Sephardic daily Siddur based on the customs from Aleppo, Syria. The app now incorporates GPS Location Services with an integrated compass to guide users in facing East towards Jerusalem when praying. Additionally, it displays accurate sunrise and sunset times based on the user's location.

Conceptualized by Bert I Dweck and Adam Dweck, and developed by Daniel Salomon on behalf of the Sephardic Heritage Foundation, the Kol Yaakob Siddur App offers a comprehensive Table of Contents. It includes all prayers for the entire year, encompassing weekdays, holidays, marriage ceremonies, special occasions, and various blessings.

It is important to note that the use of the Kol Yaakob Siddur App is strictly prohibited on Shabbat and all other religiously observant holidays.