The pocket reference, reborn as an app.

Intry is a calculator app built for electricians and HVAC techs. Every tool is open to anyone, with no login and no ads, it works offline once you add it to your home screen, and every electrical answer cites the exact NEC 2023 table and section so you can defend it. It does more than compute: it tells you what the reading means and what to do next, so a voltage drop reads passes or needs a bigger conductor and a load calc reads service adequate or upgrade likely. Unlike most store apps, it is not one calculator: conduit bending, voltage drop, wire size, conduit fill, box fill, EV charger, and load calc are all in one place.

Intry is a calculator app for HVAC technicians and electricians. Superheat and subcooling (with R-454B and A2L support), BTU load, A2L line set sizing, charge limits, and EPA leak rate are all in one app, with no login and no ads. It works offline in a mechanical room with no signal, the refrigerant numbers come from published manufacturer pressure-temperature data, not rounded rules of thumb, and the superheat tool gives a four-quadrant diagnosis of what the reading means, not just a number.

Both. Most calculations come back with a verdict and what to do next, not just a number. Superheat gives a four-quadrant diagnosis of the charge, a load calc reads service adequate, tight, or upgrade likely, an EV install flags whether your panel can carry the charger, and voltage drop tells you if the run passes or needs a bigger conductor. Each answer is backed by its cited source, the same source as the number. Save the reading to a job and Intry also tracks how it moves across visits, so a returning tech sees what changed since last time.

Both. Each calculator answers one question and cites it. But a job is a sequence, not one reading, so once you save your readings to a job, one tap hands the whole job to your AI assistant and it comes back with the next moves in order. The numbers stay ours, cited to their published source. The plan is the assistant's read of the job; it knows the trade, but you are the one who signs the work, so weigh it and give the AHJ and the manufacturer's spec the final word.

Yes. Every calculator and the installable app cost nothing, with no paywall, no subscription, and no ads. There is nothing to buy.

No. Intry has no login, no email gate, and no signup. The jobs and readings you save live on your own device, not on our servers.

Yes. Once it is added to your home screen the calculators run without a signal, so they work in basements, mechanical rooms, and anywhere cell service drops.

Yes. On iPhone, open intrysys.com in Safari, tap Share, then Add to Home Screen. On Android, open it in Chrome and tap Install app or Add to Home screen.

It does the layout math for you. Enter the offset height and angle and it returns the exact marks, the shrink, and the multiplier, plus 3- and 4-point saddles, stub-90s, and kicks, with the bend diagram. You still bend the pipe; the app kills the arithmetic and the guesswork.

Both. Intry is a Progressive Web App. It runs in the browser, but when you add it to your home screen it installs and behaves like a native app, full screen and offline, with no app store download.