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OneManOS

Built in Ontario by a working finish carpenter

Get your evenings back.
Built for a business of one.

Quotes, invoices, receipt photos and CRA-ready taxes. Everything a solo Canadian tradesperson needs, nothing a team platform bloats it with. You became a carpenter, not an accountant.

Get early access
  • Free during early access
  • No credit card
  • No sales call

THE HOME DEPOT

EAST YORK, ON

2x4x8 SPF STUD ×1271.88
WOOD SCREWS #824.97
CONST ADHESIVE11.49
SUBTOTAL108.34
HST 13%14.08
TOTAL122.42

VISA ************4187

Expense, filled in for you

Vendor
The Home Depot
Total
$122.42
HST (ITC)
$14.08
Category
Materials · Business
Paid with
Visa ···· 4187 ✓

It learned: Home Depot = business

9pm again. Two more invoices to type up at the kitchen table, and nobody pays you for that hour.

April again. A shoebox of faded Home Depot receipts and a T2125 you’re guessing at.

That payment you’ve now chased longer than the job actually took.

Sound familiar? That was the founder’s week too. So he built the tool he couldn’t buy.

One man. Both jobs. No overtime.

You swing the hammer. OneManOS runs the office. Watch the paperwork file itself.

INVHSTRCT

Five ways your week gets lighter

Get your evenings back

Quote at lunch. Send the invoice before you leave the driveway. Quote, job, invoice, payment. One thread, all from your phone. No more 9pm at the kitchen table typing up paperwork nobody pays you for.

Quotes, jobs, invoices and payments in one flow, with e-sign and client approval links.

Kill the shoebox

Snap a photo of the receipt and you’re done. OneManOS reads the vendor, the amount, the HST, even which card you paid with. It learns your habits too. Home Depot? That’s business, Materials. And since thermal receipts fade in a few months, the photo saves the deduction as well.

AI receipt scanning with card matching and per-vendor memory.

Tax season is already done

Your T2125 fills itself in from work you already logged. GST34 numbers are ready when CRA wants them, accrual-correct. T5018 for your subs, WSIB, your mileage log. All of it watched all year. No shoebox handoff. No April panic.

CRA-native: T2125 · GST34 (HST) · T5018 · WSIB · CRA-proof mileage log.

Get paid without being the bad guy

Deposits up front. Progress invoices on schedule. Extras and change orders get approved by the client with one tap, so they land on the bill instead of getting forgotten. And the app chases late payments so you never have to make the awkward call.

Payment plans, progress invoicing, client-approved change orders, reminders.

Your 10% holdback, billed the day it’s releasable

Ontario’s Construction Act holds back 10% of your money on every job. OneManOS runs the 45-day clock and tells you the day you can bill it. That holdback is real money. Stop letting it sit in someone else’s account.

Construction Act holdback tracking with release-date clocks per job.

One missed invoice costs more than a year of OneManOS.

Nothing you finish goes unbilled. That’s the whole point.

Get early access

Invoicing apps stop at the invoice. Team platforms are overkill for one person.

Simple invoicing apps

Fine for the invoice itself. But there’s no HST tracking, no T2125, no receipts, no holdback clocks. Come April you’re back in the shoebox.

Team platforms

Priced per seat, packed with crew features you’ll never open, and the good stuff gated behind $100+ a month tiers. Built for the company they hope you become.

OneManOS

The whole back office, quotes to taxes, for a business of one. On purpose. Canadian to the bone: HST, CRA forms and Construction Act holdbacks are built in, not bolted on.

A

“I run a finish carpentry business in Toronto. Trim, crown molding, built-ins. Every tool I tried was either a glorified invoice pad or a team platform charging me for a crew I don’t have. Neither knew what HST was, let alone a holdback. So I built the back office I needed. OneManOS runs my real business every day. Every quote, every receipt, every CRA form. Now it can run yours.”

Anderson, founder of OneManOS. Working finish carpenter, Ontario.

Fair questions

I run everything on spreadsheets and paper. Is switching painful?
No. Start with the next quote you send. The job, invoices and payments build themselves from there. Bring your old numbers over whenever you feel like it, or don’t. You get value on day one either way.
Is this another team platform that’s overkill for one person?
The opposite. OneManOS is built only for a business of one. No seats, no crew scheduling you’ll never use, no per-user pricing. If you grow into a crew someday, great. But you’ll never pay for that future today.
I’m under the $30K HST threshold. Do I need this?
That’s exactly when clean books matter. OneManOS watches your revenue against the $30,000 registration threshold so crossing it never surprises you. And your T2125 needs the same records either way.
Is my data mine?
Yes. Your business runs in its own private database, not mixed with anyone else’s. Export your data whenever you want. Receipts, invoices and tax numbers are yours, full stop.
What does it cost?
Free while in early access. After that, one flat price for the whole thing. No per-user fees, no features held hostage in a higher tier. You’re one person. You shouldn’t pay per seat.

Swing hammers all day.
Let the paperwork run itself at night.

Tell me a bit about you and I’ll set you up. I read every one of these myself.

  • Free during early access
  • No credit card
  • No sales call
Get early access