Stak gives builders complete financial visibility at a third of the cost of the competition, saving customers over 20 hours a month on billing. Connects to your existing accounting software — live in under an hour. Less billing. More building.
Stak goes beyond basic billing. Customize invoices with your company's branding, AI-powered project reports, and a detailed budget-to-actuals report highlighting any overages.
Stak creates detailed reports that summarize project progress, highlight billed-to-date amounts, and forecast future costs. Keep your clients informed with easy-to-read visuals and a clear description of work completed.
Stak's client bill report closes with a complete record of work — each budgeted and change-order item tied to its vendor, source invoice, and amount. Clients get a transparent, auditable account of exactly what was done and what it cost.
Stak’s client bills clearly separate change orders from budgeted work, making scope updates easy to track. Each bill features a sleek, modern design with your company’s branding; ensuring a professional and polished presentation.
Stak's budget-to-actuals reports give you real-time visibility into project profitability. See spending by cost code, spot overages early, and know exactly where every project stands financially.
Stak generates clean, professional change orders that lay out scope, markups, and totals clearly. Easy to understand and approve, to keep work flowing.
Bruce is the AI engine inside Stak. He auto-drafts emails to clients and vendors, builds reports that surface project insights, and predicts costs before they surprise you — every draft fully editable, so you stay in control. Soon, just ask Bruce to find records and create documents on command.
Stak turns any phone into a job-site invoice scanner. Text a photo of a receipt or vendor invoice and Stak's AI reads it on the spot. Reply with the project number and it's filed in seconds. No app to open, no manual entry, no paperwork lost in the truck.
Create a change order in Stak and send it straight to your client for a legally binding digital signature through Dropbox Sign. Approvals come back in minutes, not days — so scope changes never stall the job.
Stak was born from firsthand experience collaborating with a contractor to build a home. The founder saw the challenges of creating client bills and how managing subcontractor invoices, calculating markups and taxes, and handling change orders all got harder while juggling multiple projects.
As a client, the transparency of separated budgeted and change order costs on reports and invoices was invaluable — but it became clear how time-consuming that was to achieve with tools like QuickBooks Desktop. Stak was created to help contractors effortlessly produce these clear financial documents, streamline their workflow, and improve client communication.
The Best Builders Love the Stak Experience
1,011
Invoices Processed
95%
Project Match
89%
Cost Code Match
92%
Vendor Match
Customers save an average of 20 hours per week with Stak
Updated Jun 21, 2026, 12:36 AM
“Stak has been a super effective tool at streamlining our monthly invoice review and billing procedures. The platform is highly intelligent and user friendly and has become our go-to software for managing the financial side of the business, which has improved organization, communication and work flow on all of our projects.”
Colin Anderson
CCM at Hamish Anderson Custom Homes, Inc.
"Stak gives me a clean system for cost-plus billing. Budgets, job costs, and change orders stay organized, and the invoices and reports are clear for clients. It's tightened up my process and cut way down on admin time."
Ben Millar
Owner at Common Cents Remodeling LLC