Effective date: 23 July 2026
This summarises our privacy practices. For more information, see our full Privacy Policy below.
Duet doesn’t have user accounts and doesn’t collect personal data from you in the app.
We don’t run advertising or third-party tracking SDKs. The only other data we ever see is anonymised website analytics and, if you’re a TestFlight beta tester, anonymised diagnostic logs from Apple.
Read our full Privacy Policy below.
Questions? Contact me, or email me directly for any urgent privacy-related requests at privacy@myungjoon.com
1. Overview
Welcome to Duet’s Privacy Policy. Duet is still on its way to the App Store, but we wanted its privacy story to be clear from day one — including for the people kind enough to join the waitlist. This Policy explains what we collect, why, and what rights you have over it, while also covering the legal ground required under regulations like the GDPR (EU/UK), CCPA/CPRA (California), and PIPA (Korea). By using Duet, joining the waitlist, or visiting myungjoon.com/duet, you’re agreeing to what’s laid out here. If anything in this Policy doesn’t sit right with you, please don’t hesitate to reach out.
2. Important Definitions
A couple of terms come up often in this Policy, so let’s define them upfront:
Personal Data (sometimes called “PII”) is any information that could be used to identify you specifically. Data that’s been fully anonymised and can’t be traced back to you doesn’t count as such.
Service Providers are the outside tools we rely on to run Duet and its website:
Framer, which builds and hosts the website, including the Duet waitlist form;
Framer Analytics, which gives us anonymised, aggregated insight into who’s visiting the site;
TestFlight, Apple’s platform for beta testing; and
App Store, which is how you’ll eventually download the app.
3. Who’s Responsible for Your Data
Duet is built and run by Myung Joon Kang, an independent student developer. We’re the one responsible for Duet and any data described in this Policy. There’s no company or team behind this, just us.
4. What We Collect
Using the app.
Duet doesn’t collect any personal data from you.
Beta testing via TestFlight.
If you’re helping us test Duet through TestFlight, Apple may share some device info with us — your device type, OS version, battery level, and any crash or diagnostic logs. We only use this to squash bugs and improve the app; it’s never used to track you elsewhere.
Visiting the website.
The site doesn’t collect anything that identifies you personally from general browsing. We do use Framer Analytics to see anonymised, aggregated stats — referrer, pages visited, general country, OS, browser, and device type — but none of it can be traced back to you as an individual.
Joining the waitlist.
If you pop your email address into the Duet waitlist, we’ll hang onto it for exactly one reason: to let you know when Duet lands on the App Store. We won’t use it for anything else without asking you first.
If you reach out to us.
If you email us directly, we’ll see whatever you choose to share (your name, email, and message) — and we’ll only use it to reply to you.
In practice, here’s how you stay in control:
Leaving the waitlist is as simple as emailing us and asking — we’ll remove your address right away.
Leaving the TestFlight beta stops any further diagnostic data from being shared with us.
There’s no in-app account or data to delete, since Duet doesn’t collect anything from you once you’re using the app itself.
5. Why We’re Allowed to Process This
For readers in the EU or UK, here’s the legal basis under the GDPR: joining the waitlist relies on your consent (Article 6(1)(a)), which you can withdraw anytime just by asking us to remove you. Everything else rests on our legitimate interest in keeping Duet running smoothly and responding to you (Article 6(1)(f)), or on the fact that processing is necessary to give you something you’ve asked for, like a waitlist notification (Article 6(1)(b)).
6. How We Use It
Whatever limited data does reach us, we use it only to: keep the app and site running well, fix bugs, let waitlist folks know when Duet is out, respond to your messages, and meet any legal obligations we’re subject to. We don’t use anything to build a profile of you or make automated decisions about you.
7. The Tools We Rely On
The Service Providers listed in Section 2 help us run Duet, its website, and the waitlist — they’re not allowed to use your data for anything beyond that. We don’t sell, rent, or trade your data, and we never have. We’d only ever share information if the law required it, or if it were genuinely necessary to protect someone’s safety or rights.
8. How Long We Keep Things
TestFlight diagnostic data is kept only as long as it takes us to sort out the underlying issue. Analytics stay with our Service Provider in aggregated form, per their own retention practices. Your waitlist email sticks around until we’ve sent the release notification or until you ask us to remove it early, whichever comes first. If you’ve emailed us, we’ll hang on to that conversation for as long as feels reasonable to keep good records.
9. Where Your Data Travels
We’re based between Korea and Canada, and the Service Providers we use may process data in the US, the EU, or elsewhere. Where that happens, we lean on the safeguards those providers already have in place — like standard contractual clauses — to keep things properly protected.
10. Keeping Things Secure
We take reasonable steps to protect any data that does pass through our hands.
11. Your Rights
If GDPR or UK GDPR applies to you, you have the right to ask for a copy of your data, correct it, have it deleted (including off the waitlist), restrict how it’s processed, object to processing based on legitimate interest, request it in a portable format, withdraw consent at any time, and complain to your local supervisory authority if you’re unhappy with how we’ve handled things. Just contact us and we’ll sort it out.
12. If You’re in California
If you’re a California resident, the CCPA/CPRA gives you the right to know what we collect and why, ask us to delete it, correct it if it’s wrong, opt out of any sale or sharing of it (which we don’t do), and not be treated differently for exercising these rights. Just contact us and we’ll take care of it.
13. Children’s Privacy
Duet isn’t directed at children under 13 (or the relevant age where you live), and we don’t knowingly collect personal data from kids, including through the waitlist. If we ever find out that’s happened by accident, we’ll delete it as soon as we can.
14. Tracking
We don’t track you across other apps or websites for advertising purposes, so we don’t ask for tracking permission through Apple’s App Tracking Transparency framework — there’s simply nothing to track.
15. Cookies and Site Analytics
The website may use cookies through our Service Providers, but only to generate the anonymised analytics mentioned in Section 4 — nothing that builds a personal profile of you. You can turn cookies off in your browser if you’d like, though the waitlist form and some other site features might not work as smoothly.
16. Korea’s Personal Information Protection Act (PIPA)
We’re based in Korea, so Korea’s Personal Information Protection Act (PIPA) applies to how we handle personal information, in addition to the GDPR and CCPA/CPRA protections described above. Under PIPA, you have the right to request access to, correction of, deletion of, and suspension of processing of your personal information, and to be told how any of it is used or shared. In practice, this covers the limited data described in Section 4 — mainly your waitlist email address, TestFlight diagnostics, aggregated site analytics, and anything you’ve sent us directly by email. We don’t operate a separate Chief Privacy Officer function given the small scale of processing involved, but we are personally accountable for PIPA compliance and will handle any request under this section the same way we handle requests under Section 11. If you’d like to exercise a PIPA-specific right, just say so when you contact us and we’ll treat it accordingly.
17. Changes to This Policy
As Duet grows and changes, this Policy might need updates too. Whenever that happens, we’ll update the Effective Date at the top so you can tell something’s changed.
18. Get in Touch
Questions? Contact me, or email me directly for any urgent privacy-related requests at privacy@myungjoon.com
