Who it's for
An invoice app for electricians, plumbers and contractors
You are not going back to the office to type this up. The invoice needs to leave the job with you — from a phone, with the signal you actually have, in a format the client will pay against.
Short answer
What should a trades invoice app actually do?
Two things above all: work with no signal, and produce a clean PDF the client can pay against before you have left the driveway.
Invoice Spark is fully offline and needs no account. Estimates, quotations and receipts are unlimited on the free plan, which also covers 3 invoices a month. Most working trades go past that quickly, so Pro at $4.99 a month — unlimited invoices, no watermark, cloud backup — is the realistic plan for a full-time operation.
The problem with billing later
The gap between finishing a job and sending the invoice is where trade businesses lose money. Two days becomes two weeks, the client has moved on, the detail is fuzzy, and the polite chasing starts. An invoice handed over while you are still on site gets paid faster for the simple reason that the work is fresh in the client's mind and they can see it.
The reason it doesn't happen is friction: the paperwork lives on a laptop, or in an app that wants a login and a signal you don't have three floors down. Removing that friction is the whole point of an offline, no-account tool.
A working day, end to end
- On arrival — quote it. Build an estimate on the spot: call-out, labour hours, parts, consumables. Show the client the number before you start rather than after.
- During the job — add what changed. Extra fitting, second visit, materials that turned out to be different. Add the line while you remember it, not from memory that evening.
- Before you leave — invoice it. Convert the estimate to an invoice, export the PDF and send it to their WhatsApp while you are packing the van. No signal in the basement? Export now, send from the street.
- Later — chase what's overdue. The dashboard shows paid, pending and overdue at a glance, so the follow-up is a two-minute job on a Friday rather than an evening with a notebook.
Built for the way trades actually bill
- Separate lines for labour, parts, call-out and consumables
- Estimates and quotations, converted to invoices when accepted
- Receipts for cash jobs, issued on the spot
- VAT / GST with your registration number on every invoice
- Your logo and business details filled in automatically
- Client list with addresses — repeat customers billed in seconds
- Works in basements, plant rooms and rural sites with no signal
- Print directly, or share by WhatsApp for clients who prefer it
Trades this fits
Electricians, plumbers, HVAC and gas engineers, carpenters and joiners, painters and decorators, tilers, roofers, landscapers and gardeners, cleaners, appliance and phone repair, mechanics and mobile valeting, handymen and general maintenance. Anyone doing a defined job for a defined price and needing a document at the end of it.
Where it isn't the right tool
If you run a team of engineers who all need to raise invoices against a shared client list, you need cloud sync and Invoice Spark does not have it — data lives on the one phone that created it. Same if you need job scheduling, timesheets, or a “pay by card” button on the invoice. Those are real needs and a paid field-service product serves them properly.
For a sole trader or a one-van operation, the trade is worth it: see what free covers and the offline invoicing detail.
Last updated:
FAQ
Questions from trades
- What is the best free invoicing app for electricians and plumbers?
- For a one-person trade business that bills from a van rather than an office, the requirements are: it works with no signal, it produces a professional PDF you can hand over on the spot, and it costs little enough not to matter. Invoice Spark is fully offline, needs no account, and gives you 3 invoices a month free. A working tradesman will pass that in the first week, so realistically you want Pro at $4.99 a month, which makes invoices unlimited and removes the watermark.
- Can I invoice from a job site with no mobile signal?
- Yes. Invoice Spark creates and exports invoices entirely on your device, so basements, plant rooms, rural sites and new-build plots are not a problem. You only need a connection at the moment you actually send the file, and you can export it offline and send it once you're back in signal.
- Can I send a quote on site and turn it into an invoice later?
- Yes. Create an estimate or quotation while you're standing in front of the job, send it as a PDF, and when the client accepts, carry the same line items into an invoice so the billed amount matches what you quoted.
- Can I separate labour and materials on the invoice?
- Yes. Each line item has its own description, quantity, rate and optional discount, so labour hours, parts, consumables and call-out charges can all sit on their own lines. Clients query a single lump sum far more often than an itemised list.
- Does it handle VAT or GST on trade invoices?
- Yes. Set your tax rate and label it VAT, GST or sales tax as your country requires, and apply it to the whole invoice or per line item. Your registration number goes in your business profile and prints on every invoice.
Invoice before you leave the job.
Offline, no account, $4.99 a month for unlimited. The paperwork is done by the time the van is loaded.
Free plan · No ads · No account needed · Works offline