Speed of Sound

Speed of Sound is a mobile-first devotional app featuring 40 powerful lessons written by Lt. Col. Phill Cochran (USAF Ret.) — a fighter pilot who weaves military discipline, hard-won wisdom, and deep faith into every reading.

Designed for busy people on the go, the app delivers a clean, distraction-free reading experience with progress tracking, search, and offline access right from your phone. Whether you're active duty, a veteran, or simply someone hungry for faith grounded in real-world grit, Speed of Sound meets you where you are — bringing the cockpit clarity of a fighter pilot to your daily walk with God.

KEY FEATURES
• 40 complete devotional lessons
• Full offline reading — no connection needed
• Progress tracking through the series
• Fast in-app search
• Quick actions for Today's Devotional and Search