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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. For CDL, the full adaptive experience — state-aware practice and timed simulations — is live now at cdl.koydo.app, on the web and in the App Store. The same adaptive experience for electrician, HVAC, and plumbing is in development and will open as each license is ready. The group is built by KOYDO LLC, is ad-free, and is direct about what is available now, so working candidates can start CDL today 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.
CDL prep is live now — start at cdl.koydo.app. Join the waitlist and we will email you when electrician, HVAC, and plumbing prep opens.
Join the waitlist