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CDL prep is live today at cdl.koydo.app. Electrician, HVAC, and plumbing license prep are in development, joining the same group.
Koydo Trades & Licensing Prep is the group in Koydo's exam portfolio for licenses that keep skilled work moving. Free CDL study guides are live today, covering general knowledge, air brakes, combination vehicles, hazmat, tanker vehicles, passenger transport, and pre-trip inspection — each endorsement organized as its own track with worked explanations. License preparation for the skilled trades — electrician, HVAC, and plumbing — is in development and will join the group as it is ready. The full adaptive experience, with state-aware practice and timed simulations, is in early access ahead of launch; the waitlist is open. The group is built by KOYDO LLC, is ad-free, and is direct about what is available now, so working candidates can start with today's free CDL guides while the rest of the group comes online.
CDL prep is live at cdl.koydo.app — the one live exam product today. Trade licenses are coming soon.
Endorsement tracks
Air brakes, combination vehicles, hazmat, tanker, passenger — each endorsement is a separate track so you study only what your license needs.
Plain language
Explanations use the words instructors and examiners actually use. No academic padding between you and the answer.
On the road
Short units and saved progress fit rest stops and breaks. Your place is kept across phone, tablet, and laptop.
Koydo exam prep is part of the Koydo portfolio. See what a membership covers across programs, apps, and prep.
Join the waitlist and we will email you when full adaptive trades and licensing prep opens.
Join the waitlist