Open Settings → Wirebench Pro and tap Restore purchase. Make sure you are signed in to the same Apple ID or Google account you bought with, and that the device is online for that one step. Pro is a one-time purchase tied to your store account, so it restores on every device you own at no extra cost.

If it still says no purchase was found, email us with your store receipt and we will sort it out.

• Export and print professional PDF reports.
• Saved projects, parts lists, and unlimited calculation history.
• The waveform plotter, Bode plot, and the interactive instrument tools.
• The full pinout and component library.

It is a one-time purchase — no subscription, no account, and it keeps working offline once unlocked.

No. Every calculator, table, pinout, and safety guide is bundled with the app and runs on the device. The only moment the app talks to the network is when you buy or restore Pro. On a job site with no signal, everything still works.

Yes — Settings → Units. Metric gives you mm² and metres; Imperial gives you AWG and feet. The setting applies to cable length and conductor size. It changes how values are entered and displayed, never the underlying result.

Settings → Language offers English, العربية, or your system default. Arabic switches the whole interface to right-to-left layout. Numbers, units, and formulas stay left-to-right, because a resistor value read backwards is a wrong resistor value.

Tell us — this is the report we most want to receive. Send the calculator name, every input you entered, the result you got, and the result you expected with your source (a standard, a textbook, a table). Wirebench’s calculators are covered by an automated test suite, so a genuine discrepancy gets a fix and a new test.

One caveat worth stating plainly: Wirebench is a reference and estimation tool. It does not replace the applicable electrical code, a datasheet, or a qualified engineer’s sign-off. Always verify against the standard that governs your work before energising anything.

On your device, in the app’s private storage, and no. There is no account and no server holding your calculations. We cannot see your history, your pins, or your reports. The full detail is in the privacy policy.

Yes. Because nothing is uploaded, uninstalling removes your saved history, pins, and settings for good. Your Pro purchase is safe, though — it lives with your store account and comes back with Restore purchase.

Please ask. Requests genuinely shape the roadmap. Describe the calculation, the inputs and outputs you expect, and the standard or source it should follow.