CDL One Stop — Privacy Policy

Who this policy covers

This Privacy Policy explains how Harmony Stack ("we", "us") handles information in the CDL One Stop iOS app (the "App") and on the CDL One Stop pages of this website. It works alongside our Terms of Service.

Harmony Stack is the controller of the personal information described here. If you don't agree with this policy, please don't use the App.

What stays on your device

CDL One Stop is built to work offline and local-first. The following is stored in the App's own storage on your iPhone or iPad and is not transmitted to us:

• Your answers, scores, and which questions you've missed;
• Readiness percentages, mastery levels, streaks, and daily-goal progress;
• Your selected state, license class, and endorsements;
• Key dates such as your permit or exam date, and any countdowns built from them;
• Achievements and badges earned in the App;
• Language choice, sound and notification settings, and other preferences.

Your device backup (iCloud Backup or a computer backup) may include this data. That backup is controlled by you and Apple, not by us.

What we collect and why

Here is everything that leaves your device, in one place.

We don't ask for your name, phone number, contacts, location, photos, microphone, camera, or health data, and the App doesn't read them. Your quiz answers and study progress are not in this table — they never leave your device.

Accounts and sign-in

An account is optional. You can use the App fully as a guest — no email, no sign-up, nothing sent anywhere.

If you'd rather sign in, you can use Sign in with Apple or an email address. We store only what's needed to authenticate you: an account identifier and, where you provide it, your email address. If you use Apple's "Hide My Email," we only ever see the private relay address Apple generates.

We don't store your password — authentication is handled by our provider. We don't send marketing email, and signing in doesn't upload your study history.

Game Center, leaderboards, and achievements

If you're signed in to Game Center on your device, the App can submit scores and achievements to Apple's Game Center service. That's an Apple feature governed by Apple's privacy policy — your Game Center nickname is what other players see, not your email or real name.

Don't want it? Sign out of Game Center, or turn it off in iOS Settings. The rest of the App works exactly the same.

Calendar access for test dates

The App can add your permit or exam date to your calendar so the countdown shows up alongside the rest of your week. iOS asks for calendar permission the first time, and you can decline or revoke it later in iOS Settings → Privacy & Security → Calendars.

We use that permission only to create or update the event you asked for. We don't read your other events, and nothing from your calendar is sent to us.

Notifications and reminders

If you allow notifications, study reminders and streak nudges are scheduled locally on your device. Their content isn't sent to our servers, and we don't use notifications for advertising.

Turn them off any time in iOS Settings → Notifications, or in the App's settings.

Motion and device sensors

Some badges and cards use your device's motion sensor for a subtle shine-and-tilt effect. That reading is used for the animation on screen in the moment and is never recorded, stored, or transmitted. It tells us nothing about where you are or what you're doing.

Your App Store purchase

CDL One Stop is a one-time purchase through the Apple App Store. Apple processes the payment — we never see or receive your card number, billing address, or Apple Account credentials. We receive only what's needed to unlock the App and let you restore it on your devices.

Refunds and purchase history are handled in your Apple Account, at reportaproblem.apple.com.

Links to state agencies

The App links out to official state licensing pages — your DMV, MVC, DPS, or equivalent — so you can confirm rules, fees, and test dates at the source. Those sites are outside our control and have their own privacy policies.

We don't tell them you came from the App, and we don't receive anything back from them.

What we don't do

• We don't sell or share your personal information, in the ordinary sense or as those terms are defined under California law;
• We don't show ads and include no advertising SDKs;
• We don't include third-party analytics or attribution SDKs, and we don't track you across other apps or websites — so the App doesn't need to ask for tracking permission;
• We don't buy personal information from data brokers or enrich your profile from outside sources;
• We don't report your practice scores, readiness, or study habits to any employer, school, insurer, or licensing agency;
• We don't make automated decisions that produce legal or similarly significant effects about you.

Who we share data with

We share the limited data described above only with service providers who process it on our behalf, under contract, for the purposes we specify:

• Apple — App Store distribution and purchases, Sign in with Apple, Game Center, and opt-in crash diagnostics;
• Supabase — authentication for optional accounts;
• Our email provider — to receive and answer support messages.

We may also disclose information if legally required, to enforce our Terms, or to protect the rights and safety of our users or the public. If Harmony Stack is ever acquired or merged, data may transfer as part of that transaction, subject to this policy.

How long we keep data

• On-device study data — kept until you delete it or remove the App;
• Account records — kept while the account exists, then deleted on request;
• Purchase status — kept by Apple; we keep only what's needed to honor your purchase and meet tax and accounting rules;
• Support emails — kept as long as needed to resolve the issue and keep a reasonable support history.

Deleting your data

On your device: reset progress in the App's settings, or delete the App to remove its local data entirely. Deleting the App permanently removes your streaks, scores, and key dates — there's no copy on our side to restore.

Your account: email harmonyStack@gmail.com from your account address and ask us to delete it. We'll delete the account and associated records and confirm when it's done.

Game Center: leaderboard entries and achievements are held by Apple — manage or reset them through your Apple Account and Game Center settings.

Calendar events: delete them in your calendar app, and revoke calendar access in iOS Settings if you'd like.

Your privacy rights

Depending on where you live, you may have the right to access, correct, delete, or export your personal information, to object to or restrict certain processing, and to withdraw consent. Because almost everything the App creates stays on your device, you already control it directly — for anything we hold, email us and we'll act on your request.

If you're in the EEA or UK

We process personal information to perform our contract with you (providing the App and your account), on legitimate interests (keeping the App working, secure, and free of abuse), and on consent where iOS asks for it (calendar access, notifications). You may lodge a complaint with your local supervisory authority.

If you're in California

We do not sell or share personal information, and we don't process it for cross-context behavioral advertising. We won't discriminate against you for exercising any privacy right.

We answer verified requests within the time the applicable law allows — normally within 30 days. We may need to confirm your identity, usually by asking you to write from the email address on the account.

International transfers

Harmony Stack is based in the United States, and our providers process data on servers in the United States and other countries. If you use the App from outside the United States, the limited data described here is transferred there.

Where required, transfers rely on appropriate safeguards such as the European Commission's Standard Contractual Clauses through our agreements with those providers.

Children

CDL One Stop is built for adults preparing for a commercial driver's license. It is not directed to children under 13, and we don't knowingly collect personal information from them. If you believe a child has provided us information, email us and we'll delete it.

Security

Sign-in requests use encrypted connections (HTTPS/TLS). Account data sits with a managed provider with its own access controls, and we keep access to it limited to what's needed to run the service. Study data never leaves your device, so it's protected by your device passcode and encryption.

No system is perfectly secure. Keep your device passcode-protected and updated, and let us know right away if you think your account has been compromised.

Changes to this policy

We'll update this policy as the App changes or as the law requires. The effective date at the top always reflects the current version, and we'll note material changes in the App or in a release note where practical.

Continuing to use the App after an update means you accept the revised policy.

How to reach us

Privacy questions, access or deletion requests, or anything unclear here — email harmonyStack@gmail.com. We typically reply within 1–2 business days.

Harmony Stack — developer of CDL One Stop, available on the Apple App Store.