Biblia90dni is an Android app that provides users with a 90-day reading plan to complete the entire Holy Bible. Developed by Jan Figat, this application allows users to keep track of their progress while reading. The app contains the entire text of the Holy Bible, divided into sections, using the translation of the Saint Paul Edition.

In addition to providing a reading plan, the Biblia90dni project is an evangelization event that invites participants to pray and deepen their relationship with Jesus. It is a time for building faith by listening to the Word of God and getting to know the one Lord and Savior, Jesus.

Fundacja Jednym Sercem and members of the prayer and evangelization community "Pocieszyciele Maryi" organize the Biblia90dni project in collaboration with the "Ja jestem" Foundation. The project promotes reading and understanding the Holy Bible and is a challenge that aims to help participants grow spiritually and build a deeper relationship with Jesus.