What is the ruling on possessing a "Mishkat al-Ruh" (Niche of the Soul) planner, which calls for developing the spiritual aspect, and is it considered an innovation (bid'ah)?

The "Mishkat al-Ruh" (Niche of the Soul) planner does not appear to have any prohibition, due to its focus on the spiritual and devotional aspect, and its reminder of acts of worship, remembrances (adhkar), and supplications (du'as) from the Qur'an and Sunnah. What is prohibited is informing others about one's acts of worship and remembrance, as this carries the suspicion of corrupting the deed with showing off (riya') and seeking reputation (sum'ah). However, if its use is limited to an individual reminding and monitoring themselves, then there is no harm.