Answer

“Thui” is the Prakrit word for “stuti,” meaning praise or devotional hymn. In common Jain usage, teen thui usually means a 3-verse stuti, while char thui means a 4-verse stuti. So the main difference is the number of verses and the length of the prayer. ( wisdomlib.org)

Explanation

A simple example of a teen thui is a stuti with three parts: one verse praising Lord Mahavir, one praising all Tirthankaras, and one praising the holy scriptures. Jain literature also has char thui compositions such as Sarvajina Stuti and Vīra Stuti, each listed as 4-verse works. ( jainknowledge.com)

Spiritual Understanding

Both are devotional and both help build bhakti, reverence, and remembrance of the Jain path. The difference is mainly form, not spiritual purpose. ( jainknowledge.com)

Takeaway

Teen thui = 3 verses Char thui = 4 verses Both are forms of Jain stuti used for devotion and praise. ( wisdomlib.org)