Request that your account and associated data is deleted On this page · we use Supabase · no personal information

$1 for a limited time · iPhone · iPad · Mac · Android very soon

Pass your CDL written test for $1.

Other apps charge $15–$100 or bury you in ads. CDL One Stop is a full study system for $1 for a limited time — readiness score, 13 test areas, pre-trip Parts Map — on iPhone, iPad, and Mac. Android is very soon.

All 50 states + DC
Class A · B · C
iPhone · iPad · Mac
English y Español
Android · very soon

Soon

Apple · $1 limited time Android · very soon

$1 for a limited time · No ads · iPhone, iPad & Mac live · Android very soon

iPhoneLive

iPadLive

MacLive

AndroidVery soon

Why $1 wins — limited time

Study like the paid apps. Pay $1 for a limited time.

CDL prep is crowded with free apps full of ads — and premium apps that cost $40–$100. Right now CDL One Stop is a dollar, for a limited time.

Free apps

…plus ads & upsells

Ads between questions
Locked banks & paywalls
Quiz-only, no readiness plan
Hard to know when you’re ready

Premium apps

$15–$100

subs & lifetime packs

Weekly or monthly billing
$40+ lifetime common
ELDT packs can hit $99
Good content — expensive path

Best value

CDL One Stop

limited time · no ads

Full study system, no ads
Readiness score vs 80% pass line
Pre-trip Parts Map + drills
iPhone, iPad & Mac live · Android very soon

CDL school can cost thousands. A retest costs another trip and another day. Written prep shouldn’t.

Soon

How you pass

Three things drivers actually need.

Not a feature dump — a path from “I should study” to “I’m walking in.”

See if you’re ready

Every practice test moves your readiness score. The gold line is 80% — the same bar most states use. Book the DMV when the meter says so, not when you guess.

Fix what you miss

Missed questions get saved. Weak banks surface automatically. Drill Air Brakes, HazMat, Combination — the sections that fail people — until they stick.

Master pre-trip out loud

Interactive Parts Map and “How to Say It” drills rehearse the spoken walk-around — not just multiple choice. Most quiz apps skip this entirely.

Know before you go

Walk in knowing where you stand.

Industry prep is weak when drivers only read the handbook once. First-time permit pass rates often sit around ~50% without focused practice. Your readiness meter tracks accuracy × coverage against the real 80% line.

Readiness · General Knowledge 0%

80% — pass line

Try one free

Sample question — no download yet.

Feel the format. If it clicks, there are 800+ more waiting in the app.

General Knowledge Practice · 1 of 1

Which endorsement must a CDL driver have to transport hazardous materials in amounts that require placards?

Soon

$1 for a limited time · iPhone, iPad & Mac · Android very soon · EN + ES

See every screen

Available on iPhone, iPad & Mac.

Study at home on a big screen or drill in the cab on your phone. Android is very soon on Google Play.

iPhone Live iPad Live Mac Live Android Very soon

Study home on iPhone — Study homeDaily streaks, XP, and one-tap pre-trip drills.

Readiness dashboard on iPhone — Am I ready?Score every bank against the 80% pass line.

Pre-trip Parts Map on iPhone — Parts MapTap components and rehearse the walk-around out loud.

Achievement badges on iPhone — 3D badgesEarn collectible medals as you level up.

License card on iPhone — License & vaultYour progress framed like a real CDL card.

Streak calendar on iPhone — Streak calendarKeep the daily habit going until test day.

Soon

Built for real drivers

What people need from a CDL app.

Replace these with live App Store quotes as soon as they land. Structure is ready.

★★★★★

“I don’t want another $7/week sub. A buck for full practice and a readiness score is a no-brainer before my permit.”
Early tester Class A candidate

★★★★★

“Free apps spam ads between questions. This one just lets me drill Air Brakes until I stop missing them.”
Early tester Permit prep

★★★★★

“The pre-trip map is what sold me — most apps are only multiple choice. I need to say the walk-around out loud.”
Early tester Skills prep

FAQ

Straight answers before you download.

Is it really only $1?

Yes — $1 for a limited time. It’s a one-time App Store purchase, not a weekly subscription and not a “Pass Pro” upsell after you start. Lock in the dollar price while it lasts.

Are there ads?

No. Free competitors often interrupt practice with ads. CDL One Stop is ad-free so you can stay in the zone between loads or before bed.

Does it work in my state?

Yes. All 50 states + Washington DC, with Class A, B, and C filtering. Practice is aligned to standard CDL knowledge areas; always confirm local DMV rules and handbook updates.

Will questions match the real DMV test?

Practice questions follow the same topics and style as the commercial knowledge exam (General Knowledge, Air Brakes, endorsements, etc.). No app can guarantee identical official wording — use this to master the material, then walk in ready.

Is there Spanish support?

Yes. English y Español — including state licensing strings — so more drivers can prep in the language that sticks.

What devices is it on?

iPhone, iPad, and Mac are live now via the App Store (universal Apple app). Android is very soon on Google Play — the Play badge on this page is a preview link until the listing goes live.

Is it on Android?

Very soon. The Android build is in development and will ship on Google Play. Until then, use iPhone, iPad, or Mac — $1 for a limited time. We’ll replace the mock Play Store URL the day it launches.

Do I need an account?

You can start studying without building a full account wall. Optional Sign in with Apple is available for sync when you want it. Progress is designed to stay on your device by default.

How do I delete my account and data?

Use the delete link on this same marketing page: https://harmony-stack-productions.vercel.app/cdl-marketing#delete-account. In the app: Profile → Account → Delete Account on Apple, or Profile → Settings → Delete Account on Android.

Account & data deletion

Request that your account and associated data is deleted

This delete link lives on the marketing URL you already use: https://harmony-stack-productions.vercel.app/cdl-marketing#delete-account.

CDL One Stop uses Supabase as the cloud database. We do not collect personal information — no name, no email from the app, nothing that identifies you. The only data we keep is:

How the app is used
Which tests are popular
Retention time

Send the form and we delete those associated records. Usually done in 1–2 business days.

Prefer in-app? Apple: Profile → Account → Delete Account. Android: Profile → Settings → Delete Account.

$1 for a limited time. No ads. Walk in ready.

iPhone, iPad & Mac today. Android very soon. Drill the banks, hit the 80% line, rehearse the pre-trip — then book the test.

Soon

Apple · $1 limited time Android · very soon

Your study progress stays on your device. We don’t sell your data. Request that your account and associated data is deleted. Play Store link is a placeholder until launch.

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CDL One Stop iPhone · iPad · Mac · Android soon

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