Siddur Kavanat Halev is an Android application developed by Siddurim.com that offers a real Siddur with original pages of 'Kavanat Halev' Nusach Edot HaMizrach. It is a unique Siddur application that offers a sense of prayer rather than reading an article.

The app displays the prayers that are relevant to the time of the day on the main screen and matches them to the date, so that on the first of the month it will also present Halel and Musaff, and will remind you to say Yale ve'Yavo, etc. The prayers are adjusted to the date, time, and location, and the prayer compass shows which direction to pray.

Siddur Kavanat Halev also includes a Hebrew calendar that features the times of the day, the Daf Yomi, and the events of that day. Additionally, it offers an "Ask the Rabbi" option to send questions to the rabbi and a book of Tehilim.

Overall, Siddur Kavanat Halev is a comprehensive and accurate Siddur application that provides a unique experience of prayer for its users.