Find the right sum
in five seconds.
Nineteen site calculations, the lookup tables you would otherwise carry on paper, and a citation under every answer naming the table or regulation the numbers came from. Built for a loft, a plant room, and a van with no signal.
Reference tables stay free: current-carrying capacity, correction factors, colour codes, IP and IK ratings, AWG to mm², breaker ratings. NEC calculations are not in this version.
Every answer names the table it came from.
Source, edition, and year sit under the result. Settings lists the edition of each bundled table, so you can see what you are working against when a regulation changes.
It is a calculation aid, not a design tool and not a certification tool. It does not produce EICRs or minor works certificates. Every result must be verified by a competent person against the current printed edition.
Works with no signal
There is no account and no product backend. The only Apple traffic is StoreKit, if you buy Pro.
Jobs and a Site Report
Save a result against a named job, pin a location, file a photo of the board, and export one A4 Site Report for the customer or the file.
Tools on the van
Spirit level, compass, magnifier, torch, screen light, unit converter, and a job timer. Each one stays on the phone.
Unlimited calculations
Three distinct results a day on the free tier. Pro drops the cap and shows the plate live as you type.
Named jobs
A job holds a name, address, client, notes, saved results, and photos. History is searchable.
Site Report export
One branded A4 PDF: your trading name and logo, each result with its citation, and the disclaimer on every page.
Work stays on your iPhone
Jobs, history, photos, and your business logo live in a local database. Nothing is uploaded.
No accounts, no analytics
There is no sign-up, no analytics SDK, and no product backend. The app has nothing to phone home to.
Camera and location stay put
Used only when you ask: a photo of a board, a pin on a rural site, true north on the compass.
Three calculations a day are free.
Enough to check we match the book. Tables stay free. Pro is the job file: unlimited runs, save, history, and the Site Report.