TrueFault: Fault Current Calc

TrueFault Pro is a one-time purchase — buy once, unlock forever. No subscription, nothing renews.

TrueFault is an offline available fault current calculator for electricians, built around a five-step wizard that walks you from your system to a result you can read and check.

The wizard guides you through:

1. System — pick single-phase or three-phase.
2. Primary fault current — enter the utility available fault current feeding your service.
3. Transformer — enter the transformer rating, voltages, and impedance (%Z), with tolerance handling.
4. Path to the fault — build the conductor run to the point you care about.
5. Result — see the available fault current along with the inputs, assumptions, and warnings behind it.

Because TrueFault works entirely on-device, you can run a check on a job site, in a switchgear room, or anywhere without signal. Nothing about your calculation has to leave your phone.

Free and Pro:

• Free covers single-phase available fault current checks — system, primary fault current, transformer, conductor path, and a reviewable result with visible assumptions and warnings.
• TrueFault Pro unlocks three-phase system calculations.

TrueFault Pro is an auto-renewable subscription:

• Monthly: $0.99 per month
• Yearly: $4.99 per year

The yearly plan is shown by default because it is the lower yearly cost. Subscriptions are billed to your Apple ID. Billing, renewal, and cancellation are managed in your Apple ID account settings; renewal occurs unless auto-renew is turned off at least 24 hours before the end of the current period. The free single-phase calculator stays available whether or not a subscription is active.

TrueFault is a field aid. Results are drafts to verify before use. It is not a stamped engineering calculation and does not replace code review, engineering judgment, utility documentation, manufacturer data, field and nameplate review, or verification by a qualified professional. You are responsible for confirming utility data, equipment nameplates, conductor details, installation conditions, and applicable code or engineering requirements.

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