iFixit

iFixit puts a large library of repair documentation on your phone. Each manual walks you through a specific job, such as opening a device, swapping a battery or a screen and putting everything back together, with photos for every step.

The content comes from in-house technicians and a community of contributors. Beyond the manuals, the app offers troubleshooting flows that narrow down a fault, battery health insights, and a personal workbench where you list your devices and instantly see compatible parts, tools and procedures. An assistant draws on the same library to answer questions.

It is a good fit for anyone who prefers to fix things rather than replace them, and for technicians who want a reference in their pocket. Loading manuals needs an internet connection; an account is used for the workbench and purchases.