Koydo CDL Prep

Practice for the CDL knowledge exam with one focused app for the sections that matter on test day.

Koydo CDL Prep helps future commercial drivers study the FMCSA and state DMV knowledge areas with state onboarding, section practice, mock exams, starred review, recently-wrong review, Progress Points, reminders, and parked-study voice prompts.

WHAT'S INSIDE • 1,250 sourced state-rules prompts across all 50 states • 1,577 total English CDL practice rows across core sections, pre-trip, and state rules • Section-by-section practice for General Knowledge, Air Brakes, Combination Vehicles, Hazmat, Doubles/Triples, Tanker, Passenger, School Bus, and Pre-Trip Inspection • 8-question placement to recommend the best starting section • Full mock exam with 80% pass threshold and readiness certificate • Starred and recently-wrong review modes • Progress Points, streaks, levels, and standalone opt-in CDL leaderboard • Parked-study mode with optional speech input, for parked breaks only • Clean CDL-specific account, subscription, and legal flow in the app

IMPORTANT Koydo is an independent adult study app. It is not affiliated with FMCSA, any DMV, or any state licensing authority. Always confirm requirements against your official state CDL manual.

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