The integrated platform
An operating system of apps where AI bots do the heavy lifting and people stay in the loop. Run attest engagements and keep the books today, and explore our accounting training pilot. Payroll, tax, and health records are in development. Built by CPAs and Chartered Accountants with years of Big Four experience, software engineers, and physicians.
AttestWork and Books are live now. No card required to start a trial.
Products
AttestWork and Books are live now. Each product has its own page and its own sign-in — start with what you need and add the rest as it launches.
Academy & training
Accounting and responsible-AI training with employer oversight, internal or external mentors, evidence and verified progress. Company-led or CPA-firm-managed pilot access; government registration remains pending.
Assurance
Audit, review, compilation, preparation, AUP, and examination engagements in one workspace. The built-in AttestWork Assistant is context-aware and documents procedures as tables from the WPOS Template Library.
Accounting
Clean books for small and medium organizations anywhere - transactions, reconciliation workpapers, journals, and the month-end close. The built-in multi-chat assistant answers from the live ledger and, with approval, posts journal entries, categorizes bank feeds, and runs reconciliations.
Why one platform
WorkpaperOS brings assurance, accounting, payroll, and records onto one account and one data backbone, so a number entered once shows up everywhere it belongs.
Across the apps, AI agents handle the grunt work - extracting fields, matching transactions, tying out balances, and drafting workpapers - while a person reviews and signs off wherever judgement matters. AttestWork and Books ship with built-in assistants, and connecting your own AI over MCP stays part of every app plan.
Sign in to the integrated apps once and move between AttestWork, Books, and everything we launch next without a second login.
The ledger Books keeps is the ledger Payroll posts to and the data AttestWork imports for an engagement — no duplicate uploads.
CPAs, Chartered Accountants, software engineers, and physicians design the workflows around real deliverables.
Connect your AI over MCP - the server URLs
Connect Gemini Spark, Google Antigravity, Claude, or ChatGPT using the app's MCP URL and your WorkpaperOS account. Spark users add a custom app in Connected Apps; Google's eligibility requirements apply. Original-file exchange has been validated with ChatGPT, Claude, and Antigravity. File and network capabilities vary by AI product.
https://attestwork.workpaperos.com/api/mcphttps://book.workpaperos.com/api/book/mcpWho it's for
Whether you deliver client work or run your own organization, the integrated platform takes you from intake to finished deliverable with fewer tools to stitch together.
Explore the products