Prop your phone above your paper, pick a reference image, and trace it by looking through the screen. One purchase unlocks it for good — no subscription, no account, and nothing you import ever leaves your device.
This is the thing worth knowing before you download it. Dürer is not a projector. Your phone shows the camera view of the paper with your reference image laid over it, and you draw on the paper underneath while looking at the screen. Nothing is cast onto the page.
Every tracing app of this kind works this way. It is the single most common reason people are disappointed by one, so it is the first thing we tell you rather than the last.
Importing your own photo is included in the unlock, not sold as an extra. The photo is read, converted to line art and displayed entirely on your device — it is never uploaded.
Once you tap the lock, the reference image is frozen and the overlay stops responding to touch. Resting your hand or a stylus on the screen while you draw will not nudge it out of alignment — the failure that makes tracing on a phone frustrating. Long-press the unlock control to release it.
After two short introductory screens, a single one-time purchase unlocks Dürer: US $19.99 in the United States — Apple sets the price in other countries, and the app shows yours before you buy. It is not a subscription — nothing renews and there is nothing to cancel. No advertising, no account, no sign-up, and no limit on use once unlocked.
Bought it already? Tap Restore purchase while signed in to the same Apple Account. Dürer has no server of its own — the Privacy Policy names the services it does use.
Dürer is built for iPhone. It is on the App Store, listed as Dürer: AR Photo Drawing Trace. The download is free; the one-time purchase above unlocks it inside the app.