Software for service businesses · Web & iOS
S Invoice handles the estimates, invoices and getting paid. S Protocol runs the whole operation — jobs, schedules, technicians and the money behind them. Same account architecture, so starting small never means starting over.
Run the whole business
See every job, know who’s going, and get paid for it — with your customers, technicians and money in one system.
Free to start · Pro $24.99/moWeb and iPhone
Create · send · get paid
Price the job, send a professional invoice, and know exactly what’s still owed — from the driveway or the kitchen table.
Free to start · Pro $4.99/moWeb and iPhone
If you schedule other people’s work, you want S Protocol. If you bill for your own, start with S Invoice — and add the operations later, on the same workspace.
Compare themS Protocol
The morning starts here. Who is working, what is booked, what is running late, and what is still unassigned — without a group chat and three calendars.
How the work moves
Nothing gets retyped between stages. The customer, the technician, the estimate and the invoice are all the same thread — which is why the history is still there a year later when they call back.
Or a website form arrives. It lands as a lead with the address and the problem already attached.
Pick the slot, pick the technician. The schedule and the board update together.
Status, notes and photos from their phone. The office sees it without asking.
Approved work converts straight to an invoice against the same job.
Card, Tap to Pay on iPhone or cash. It reconciles to the invoice and stays in the customer’s history.
The job record
The customer’s history, the technician assigned, what was quoted, what was billed, and what is still owed. Open it in the office or in the van and it is the same record.
My day · Thu 14 Aug
3 jobs
The technician view on iPhone. Status, photos, notes and payment at the door — the same job record the office is looking at.
Tap to Pay on iPhone
Take the payment in person on the phone that is already in the technician’s hand. No card reader to buy, carry or charge.
Card readers are supported as well. In-person payments are USD.
S Protocol pricing
Add every dispatcher and technician you employ — the price does not move. Free is a real way to set up and try the whole platform.
$0
$24.99/month
Prices in USD. Subscriptions renew until cancelled. Where the subscription is bought through the App Store, Apple handles the billing, and the subscription is managed and cancelled through your Apple account. By subscribing you agree to the Terms of Service and the Privacy Policy, which cover S Protocol and S Invoice alike.
One family
S Invoice and S Protocol are two products on one foundation. Adding the operations layer is not a move, an export or a fresh start — the same business, the same customers, the same numbering, with more of the work inside it.
Your invoice history stays visible in the new CRM. Job invoices created in S Protocol stay on the operations side, so the S Invoice list you know does not fill up with dispatch paperwork.
The one condition, stated plainly: activating S Protocol on an existing S Invoice workspace starts on a paid S Protocol plan, and the workspace owner is the one who does it. Creating a free S Protocol account instead is a separate signup with a fresh, empty workspace.
Read the detailS Invoice
For the person who does the work and also does the billing. Professional documents, a link the customer can pay from, and an honest answer to “what am I still owed?”
Good morning, Rosa
Thursday, August 14
Needs attention · 3
Recent invoices
View allWhat the customer receives · the real document
Send a link or a PDF. Your customer opens it on their phone, sees exactly what the work was, and pays by card without creating an account. You can give the invoice a plain-language title — “Hanging” — while the number stays the number.
PAYMENT
Paid by card on Aug 12, 2026. Thank you — parts carry a 90-day warranty.
Ruiz Appliance Repair · Licensed and insured · Questions? (716) 000-0000
Recent invoices
S Invoice on iPhone — four KPI tiles, recent invoices, and the Home / Invoices / Customers / More tab bar. Custom titles lead the row with the number beside them.
Start with an estimate or go straight to the invoice. Line items, tax, your logo and brand colour, and an optional plain-language title.
A link the customer opens on their phone, or a PDF for their records. No account, no app, no friction.
Card online through Stripe, or record the cash and cheques yourself. Part payments and refunds are handled properly.
What came in, what is still out, and who is behind. Generate a statement for a customer covering any period.
S Invoice pricing
Free is a genuine trial of the real thing — three invoices and three recorded payments, then it is $4.99 to keep going.
$0
$4.99/month
Prices in USD. Subscriptions renew until cancelled. Where the subscription is bought through the App Store, Apple handles the billing, and the subscription is managed and cancelled through your Apple account. By subscribing you agree to the Terms of Service and the Privacy Policy, which cover S Invoice and S Protocol alike.
Side by side
| Capability |
S Invoice
Best for a solo pro or a small crew who bill for their own work.
Free · Pro $4.99/mo
|
S Protocol
Best for a business scheduling and dispatching other people’s work.
Free · Pro $24.99/mo
|
|---|---|---|
| Getting paid — both products | ||
| Invoices | Yes | Yes |
| Estimates | Yes | Yes |
| Customers and history | Yes | Yes |
| Public invoice links and PDFs | Yes | Yes |
| Online card payments | Yes | Yes |
| Reports | Yes | Yes |
| Multi-currency documents | USD, CAD, EUR, GBP | USD |
| Customer statements | On iPhone | No |
| Running the operation — S Protocol only | ||
| Jobs | No | Yes |
| Scheduling and dispatch | No | Yes |
| Technicians and team roles | No | Yes — no per-seat cost |
| Tap to Pay on iPhone | No | Yes — USD |
| Calls and SMS on your business line | No | By request |
| Website lead intake | No | Yes |
| Team chat on the job | No | Yes |
Still deciding? Start with S Invoice. If the business grows into scheduling and crews, S Protocol activates on the same workspace.
Start invoicing free
For a solo pro or small crew billing for their own work.
For a business scheduling and dispatching other people’s work.
Connections
Card payments from the invoice your customer opens, plus wallets, deposits, part payments and refunds against the original charge.
Take the card at the kitchen counter — Tap to Pay on iPhone uses the phone the technician already carries, with no separate reader. Card readers are supported too. USD only today, a documented boundary tied to reader capability rather than an oversight.
Business calls and SMS on your company line, with recent calls surfacing on the dispatch board so you know who rang.
An enquiry from your own site arrives as a lead with the address and the problem, ready to become a booked job.
Inbound leads routed into your workspace. Provisioned per business rather than switched on from Settings.
API access and webhooks for businesses running something specific. Tell us what you need to talk to.
Where this came from
Built by people running the jobs. The first workspace was an appliance repair business — and it still runs on this.
Every workflow here started as a problem somebody had on a Tuesday morning: a technician stuck without the history, an invoice nobody chased, a job assigned twice. That is the reason the dispatch board looks the way it does, and the reason S Invoice exists separately for people who only need the paperwork.
Questions worth answering properly
You stop being able to create new invoices of that kind until you upgrade. Nothing is hidden, locked or deleted — every invoice, payment and customer you already have stays fully readable. The allowance is one-time per business, not monthly, and deleting a document does not give it back.
Yes, and it is not a migration. S Protocol is activated on the same workspace, so your customers, invoices, estimates, company details and invoice numbering are simply still there. The owner starts it from Settings, and that first activation is on a paid S Protocol plan. A free S Protocol account is instead a separate signup with an empty workspace.
No. There is a Free plan with a real allowance instead, and it uses the same product Pro does — not a stripped demo. We would rather you test the real thing than race a countdown.
No. S Protocol Pro has no team-member limit and no per-seat charge. Add the dispatchers and technicians the business actually employs.
Your data is never held hostage. If a subscription lapses or is cancelled, you keep read access to everything and drop back to Free limits for creating new records. Cancelling mid-period keeps Pro running until the period you paid for ends.
S Invoice documents can be USD, CAD, EUR or GBP, and online card payments work in all four. The currency is stamped when the document is created and never converted afterwards. In-person card payments are USD only for now.
Yes — both run on the web and on iPhone. There is no Android app, and we will not claim one until there is.
Yes. A workspace with both keeps its S Invoice side working exactly as before. Customers are shared across both; invoices raised against dispatched jobs stay on the S Protocol side so your invoicing list does not fill up with operational paperwork.
Get in touch
Want to run your business on S Protocol, start invoicing with S Invoice, or request a workflow? Send a note and we’ll get back to you.
Both are free to begin, on the web and on iPhone. Neither one asks for a card to find out whether it fits.
