QR Codes for Software and Game Developers

Install, but land somewhere specific

A smart app code sends iPhones to the App Store and Android to Play from a single square, which removes the two-code layout that has cluttered print for a decade.

The important part is what happens after installation. A plain store link drops the user on your home screen with no context. Deferred deep linking carries the original intent through installation, so someone who scanned a code on a poster for one specific item arrives at that item.

Deep links themselves have real edge cases, particularly when the app is not installed and the fallback has to behave sensibly rather than showing a browser error. The deep links versus universal links guide covers the difference and where each one breaks.

Pairing and login

• Desktop login by scan, where the phone confirms the session and no password is typed. The token exchange is explained in the login guide
• TV, console and device pairing, which is the case that saves users from entering a password with a directional pad
• Two-factor enrolment, the single most common QR code in software, using the otpauth format described in the authenticator guide
• Session transfer from desktop to mobile, so a form or a checkout continues in a pocket

For anything security-related: short expiry, visible countdown, single use, and a confirmation step on the phone. A login code that stays valid for ten minutes is a phishing tool.

Beta, builds and testing

• TestFlight and internal build distribution by scan, which is far faster than sending links around a room
• Device-specific test builds at a QA station
• Bug reporting from a code on the test rig, opening a report with the build and device already attached
• Staging environment access for reviewers who should not have to be told a URL

In-game and physical crossover

• Codes in trading cards, figures and collectibles that unlock in-game content, which is a proven mechanic and a strong anti-counterfeit measure when serialised
• Event and convention codes for limited items
• Codes inside the game world as a puzzle mechanic, which works when the code is rendered at sufficient resolution and not animated
• Retail box codes that carry the licence key without typing twenty characters

Rendering codes in your own product

• 200 px minimum on screen, pure black on pure white, even in dark mode
• Generate as SVG, not a bitmap, so it scales on every display density
• Never animate anything adjacent to the code, since motion defeats autofocus
• Always show the manual alternative: a short code to type, a copyable link, and real alt text
• On refreshing codes, show the countdown and a regenerate control so an expired code reads as expired rather than broken

Analytics without a tracking mess

Use a distinct code per surface: packaging, poster, conference, documentation, partner site. Combine with UTM parameters and the acquisition report answers which physical surface produced installs, which is normally the least attributable spend a software company has.