Build your own QuickBooks and Xero alternative with your AI agent
Your company’s own books: one general ledger behind sales invoices, supplier bills, expenses with their receipts, payments, fixed assets and foreign currencies, with the reports an accountant reads. It is built to replace the bookkeeping core of Xero, QuickBooks and similar small-business accounting tools.
Paste one prompt. Your agent builds your version.
Paste it into Claude Code, Codex or Cursor. Your agent reads the blueprint, asks how your company works and shows you a one-page plan. Once you approve it, the agent builds your version on SegmentStream, turns every invariant into a test and deploys when you say so.
Read https://github.com/segmentstream/build-your-own/blob/main/AGENTS.md and follow it.
Build our Bookkeeping from the bookkeeping blueprint.What your agent builds
One general ledger for invoices, bills, expenses with receipts, fixed assets and multi-currency, with the reports your accountant reads.
What it is not
- It is bookkeeping software, not tax or accounting advice. A qualified accountant should review the chart of accounts, tax rates, depreciation policies and opening balances before you rely on the books.
- The first version has no bank feeds or bank reconciliation, no tax returns and no payroll. They are described as extensions and are future blueprints.
- It keeps the books of each legal entity separately. It does not consolidate groups, track inventory or replace an audit.
- Every money event, from an invoice to depreciation, is one balanced journal in one ledger, so the trial balance, profit and loss and balance sheet are built from the same entries and agree.
- Posted entries never change. Mistakes are corrected by reversal, and every change keeps its author and reason.
- Closed periods stay closed: a lock date stops anything from posting into a month your accountant has signed off.
- Invoice numbers are issued in sequence, designed to leave no gaps, and each one shows what is still owed. Aged receivables and payables come from the same ledger.
- Expenses carry their receipts, and each shows whether its evidence is complete, partial or missing, so the gaps are known long before year end.
- Fixed assets depreciate every month, and foreign-currency balances are revalued at each month end, without anyone running a script.
- Your team and the workspace agent work from the same records: “what is overdue?”, “file this receipt”, “post depreciation for March”.
The hard parts are already running.
Your agent writes only the business logic. SegmentStream runs the infrastructure under it, so nobody on your team builds or operates it.
- A transactional company database: a journal posts completely or not at all, and every change is kept in history with who made it.
- Roles checked on the server for every posting, approval and lock date.
- File storage for receipts and invoices, uploaded straight from the browser.
- Connections for exchange rates or an import from Xero, with credentials kept by SegmentStream.
- Replication into the warehouse, so management reports and metrics read the same ledger.
- QuickBooks
- Xero
- Sage
- FreshBooks
- Zoho Books
- Wave Accounting
Product names are trademarks of their owners, named only to describe what the blueprint can be compared with.
What’s in the blueprint
Five files your agent reads before it builds anything. Each opens on GitHub.
- BLUEPRINT.mdThe designRecords, actions, roles, workflows, data flow, screens and the build order.
- INTERVIEW.mdThe interviewWhat your agent asks about your company, and what each answer changes.
- INVARIANTS.mdThe invariantsRules that must hold in every version, each one a test in your project.
- VARIATIONS.mdThe variationsWhere companies legitimately differ, and the default for each.
- PITFALLS.mdThe pitfallsMistakes agents already made in production, so yours does not.
Blueprints are provided as is; see the disclaimer.
Related solutions
Company accounting
Ledger, invoices, bills, reconciliation and reports
Finance and accounting
Contracts, revenue recognition and documents
Xero alternative
Your books in a ledger you own, moved off Xero month by month
QuickBooks alternative
Your books in a ledger you own, moved off QuickBooks month by month
Build your company’s own software. Let agents run it.
$ segmentstream workspace create acme --region eu --subdomain acme
▸ Created workspace acme · database, warehouse and a private git repository
$ segmentstream workspace WORKSPACE-ID clone acme && cd acme
▸ your coding agent builds what your team asked for and runs the checks
$ git add -A && git commit -m "First version"
$ segmentstream deploy
▸ app, company agent, API and MCP tools live for your invited members
Our engineers build the first version on your data in two weeks, at a fixed price.
Or build it yourself with your coding agent:
curl -fsSL https://segmentstream.com/install.sh | sh