Questions

No, and it is written not to. It shows the arithmetic from AC 20-27G and names the paragraph, and it tells you plainly that the FAA makes the determination under ¶7g. Any percentage, count or checklist total it shows is derived from what you entered and carries no regulatory meaning.

On your own computer, in the browser the app runs in. There is no account and no server, and nothing is sent anywhere. A build runs for years, so your records are a file you own and can back up yourself — not a row in somebody else's database.

Only twice: once to activate your licence key, and once each time you pick a kit from the FAA's published kit listing. Everything else works with no internet at all, including every print. You can always type the kit make and model in by hand instead.

Yes. Each project keeps its own log, tasks, photographs, equipment, weight and balance and Phase I record, and nothing crosses between them — the FAA sees two aircraft as two sets of records. Your own details are shared across everything you build.

Print & Export writes a file GA MX Helper opens as a new aircraft, carrying the airframe, engine and propeller, the airworthiness details and the whole build history. The build does not get left behind in a different app, which is what usually happens.

It prefills what it can take directly from your project data, and leaves blank anything calling for a judgement, a certification, an inspection finding, or an entry belonging to an FAA representative, designee or notary. Review every entry before you sign: a signed form is your statement, not the app's.

No. Eligibility under 14 CFR 65.104 is determined by the FAA. The app can prefill the application from what you recorded, but nothing it produces establishes that you are the primary builder or that you qualify.

It is the FAA's published National Kit Evaluation Team listing, reproduced as it stands. A kit being on it means the kit was evaluated — not that it is approved, not that your particular build is, and not that the major portion requirement is met for you.

As many as your browser has room for. A build log is mostly photographs, so it grows: export regularly and keep the file somewhere else as well. The app tells you if storage runs out rather than failing quietly, and your activation is kept separately so it survives that.

No. One-time purchase, and the version you buy keeps working for as long as you use it. Bug fixes are free.

Both, and Linux. It is one HTML file that runs in your browser, with a small launcher for each platform that serves it from your own computer. Nothing is installed into the system.

Yes — the live demo is the real app loaded with a sample build. Nothing is saved and nothing is written to your browser.