Rubber Duck

Rubber Duck is a preflight testing service designed specifically for mobile app developers who submit applications to the Apple App Store. Its core function is to identify issues that could lead to rejection before the app ever reaches Apple’s review team. Instead of requiring developers to write test scripts, manage device farms, or recruit human testers, Rubber Duck operates on a simple input-output model: the developer provides the live App Store link (e.g., from TestFlight or a public listing), and the platform takes over the entire testing process. The service downloads the app directly from the store and runs it on real physical devices — iPhones and iPads of various models and OS versions — to simulate real user behavior. Every screen, flow, button, gesture, and edge case is explored manually and automatically, without any prior scripting or configuration from the developer. The output is a detailed video recording with timestamped voiceover comments that point out exactly where an issue occurs, which App Store guideline it violates, and how to reproduce it. This contrasts sharply with traditional manual QA approaches, which typically take days or weeks and produce inconsistent feedback, or with waiting for Apple’s own review, which can result in vague rejection letters and wasted salary costs when a build fails after weeks of development. Rubber Duck reduces the turnaround time to about 24–48 hours on average, with a “Preflight” tier delivering results in roughly 4 hours. Its rejection rate for apps that pass its testing is reported as 0% in the “Pre-flight” category, compared to a typical 40% rejection rate for apps submitted directly to the App Store without such pre-testing. The service also provides concrete guideline references — for instance, if a button o