Kardhaus

Support

One person answers this address. Write in plain language — there is no ticket form to fill in.

hello@kardhaus.com

Questions, bug reports, refunds you can’t work out, privacy and deletion requests, accessibility problems. It reaches us whoever you are and whatever you have paid. If you have bought Kardhaus, write in from Settings inside the app instead — a purchase puts you in a shorter queue automatically, and you do not have to ask for it or know which address to use.

Kardhaus is made by one independent developer in Taiwan (UTC+8). Expect a reply within a couple of working days rather than within the hour, and expect it from a person rather than a macro.

Reporting a bug from inside the app

Settings has Send feedback and Report a problem. Both open a mail draft addressed for you, with a prompt to type over and a short diagnostics block appended at the bottom. Use them in preference to writing from scratch: the diagnostics answer the three questions we would otherwise have to ask first.

The block is plain text in an editable draft, and nothing leaves your phone until you tap send. It is fenced off and labelled as deletable, so you can read every line and cut it. This is what it contains, and it is the whole list:

  • App — the Kardhaus version and build number.
  • iOS — the system version.
  • Device — the model identifier, the string iOS reports rather than the marketing name.
  • Locale and Language — which regional formats and language you run.
  • Purchase — free or pro. It decides which mailbox the draft is addressed to.
  • Apple Intelligence — whether the on-device model is available, ineligible, switched off or still downloading. Half of all "recognition got worse" reports are answered by this line alone.
  • Cards — how many cards are in your library. The number, and nothing else about them.

No card content is included: no name, no company, no phone number, no note, no image. There is nothing in that block that identifies a person.

Before you write in

  • Refunds are Apple’s, not ours. The purchase contract is with Apple, so we cannot issue one. Go to reportaproblem.apple.com, sign in, and pick the purchase. Asking Apple directly is faster than asking us to ask them.
  • Bought it and it is locked on your other device? Open Kardhaus, go to the purchase screen and tap Restore purchase. Kardhaus supports Family Sharing, so a household member’s purchase unlocks yours the same way.
  • Export is free and always was. vCard and CSV, the whole library, no paywall in front of it. If you are writing in because you cannot get your data out, you have hit a bug — tell us.
Is iCloud sync a backup?
No, and treating it as one loses data. Sync means every device shows the same library: delete a card on your iPhone and it disappears from your iPad too, because that is the same card, not a copy of it. A backup is a file you keep. Use Settings → Export to write a vCard or CSV somewhere of your own before you change phones.
A card was read wrongly. Can it be fixed?
Edit the field directly — tap the card, tap the value, correct it. Recognition is not perfect and never will be: stylised type, low-contrast printing, foil and unusual layouts all defeat it. Fields it was unsure about are marked so you can find them. If a card is read badly and you are happy to send it, attach the photo to a mail — a real card that fails is worth more to us than a description of one.
Why is recognition better on someone else’s phone?
The second pass uses Apple’s on-device language model, which needs a device that supports Apple Intelligence and needs it switched on in iOS Settings. Where it is unavailable, Kardhaus still reads cards with the OCR built into iOS — the same scan, one layer less sorting. The diagnostics line in a mail from inside the app tells us which of those you are on.
Does anything I scan get uploaded?
No. The app contains no networking code — there is no request it could make to us. Airplane mode is the test, and every feature passes it. If iCloud sync is on, your library syncs through your own iCloud private database, between your devices and Apple, with us not a party to it. The privacy policy, linked below, sets out all of it.
How do I delete everything?
There is no account, so there is nothing on our side to close. Deleting the app clears that iPhone. If iCloud sync was on, the copy in your own iCloud has to go separately: Settings → your name → iCloud → Manage Account Storage → Kardhaus → Delete Data. Neither can be undone, so export first if you might want the data back.
What does Kardhaus need to run?
An iPhone on iOS 18 or later. No account, no sign-up and no network connection — the app works with the radio off.

Privacy and deletion requests

Mail hello@kardhaus.com from the address in question and it is done — no verification hoops, no form. What we hold and how long we hold it is set out in the privacy policy; the short version is that the app sends us nothing, so in practice this only ever concerns a wishlist signup.