Ohmly: Electrician App, EICR

Proxime Technologies Ltd

Contains ads

About this app

EIC, EICR and Minor Works certificates for UK electricians working to BS 7671. Enter each number once and it carries from the design through to the certificate. The full safety engine, the cable calculations and your first job's certificates are free.

Add the job once and the same numbers travel through it. The circuit details become the wiring diagram. On Pro, the diagram becomes the priced quote. Your readings become the schedule of test results, and the schedule becomes the certificate. The evening you would have spent copying numbers is yours.

Works with the tester already in your van: any brand, any age, nothing to pair. You read the meter, then type the number, or say it if your phone supports speech. Typing works offline, with no signal.

FREE, AND STAYING FREE
Every safety determination and warning, in full
The installation checklist, including safe isolation
Every calculator in the hub
Test entry, checked against the design
EIC, EICR and Minor Works certificates, first job free to issue
Consumer unit schedule on screen and way labels
Glossary, symbol library, PNG export, five jobs

Nothing that keeps an installation safe is ever behind a payment.

FREE CALCULATOR HUB
Seven calculators, one tap from the home screen, free on every plan: cable sizing, voltage drop, earth fault loop impedance (Zs), Which RCD do I need?, adiabatic, prospective fault current, and conduit and trunking capacity. The sizing, voltage drop, Zs and RCD answers come from the engine that designs your circuits.

DESIGN
Tell Ohmly the circuit details, the supply, the location and the load, and get a wiring diagram with the cable size, protective device and reference method worked out. Twenty-two job types, from lighting and ring finals to EV charger, solar PV, battery storage, heat pump, underfloor heating and three-phase boards, plus consumer unit layout.

CHECK
Every determination runs against your actual design: surge protection, AFDD, earthing and bonding sizes, maximum demand against the supply, earth fault loop impedance. Where Ohmly has not been told something, it names what is missing.

QUOTE AND INVOICE (PRO)
The drawing becomes a priced materials list, a shopping list and a customer quote. Invoice any job, quoted or not. Set your own prices, day rate, callout charge and markup once; every quote uses them.

TEST
Enter your readings beside the expected values, judged against the limit for that circuit's device. Continuity, insulation resistance, Zs, RCD times, polarity and the rest, each with the reason for its limit.

CERTIFY
The Electrical Installation Certificate (EIC), the Electrical Installation Condition Report (EICR) and the Minor Works certificate, built from the design and readings you entered. Sign on the phone and issue the PDF on site. The DNO's G98 Form B fills in from the job too.

YOUR WORK STAYS YOURS
Everything lives on the phone: no Ohmly servers, no account to create. On Android 12 and later, with a screen lock set, back up to your own Google Drive, never to us. Or write one backup file and keep it safe.

PAID TIERS BUY BACK YOUR EVENINGS
Pro: unlimited jobs, branded PDF with your logo and scheme number, your own prices, customer quotes and invoices, SVG export, EV charger, solar PV, heat pump and underfloor heating design, and a battery's own circuit. Pro+: three-phase boards with phase balancing, emergency lighting, fire alarm, motor, agricultural, caravan park and marina, landlord portfolios with EICR recall, board changes, rewires and DXF export.

Every figure Ohmly uses is checked against the published standard, read from a named edition and re-derived from the printed formula. Checked is not a claim about your installation: the judgement on site stays yours.

Download free and issue your first certificate. UK only, for electricians working to BS 7671:2018+A4:2026 (the 18th Edition), the On-Site Guide and Guidance Note 3. Ohmly is not affiliated with the IET, the BSI, or any competent person scheme.

What’s new

Ohmly now suggests the minimum RCD type on each certificate row for you to confirm, a board's ways record their RCD type, condition reports note when every C1 and C2 was put right, three-phase boards check each way's RCD by what it supplies, sub-boards are sized from their own earthing, invoices print your chosen document colour, and many accuracy improvements.