Invoice Generator
Replaceable in one session with an AI coding agent.
Fills in an invoice in the browser and hands back a PDF, with saved clients and line items so the next one takes a minute.
Build an invoice generator with a numbering rule. STACK - One HTML page, SQLite, Playwright or WeasyPrint for the PDF THE DOCUMENT - Clients, line items, tax rate, notes, payment details - Totals computed, never typed NUMBERING, WHICH IS A LEGAL MATTER - Sequential with no gaps, per year, allocated inside a transaction - Never derived from a row id, never reused after a deletion IMMUTABILITY - Once issued, the PDF is stored and never regenerated - Regenerating after a template change would silently alter a document somebody already has - A correction is a credit note, not an edit THE TEMPLATE - One print stylesheet, page size and margins set with @page - Tabular figures so the amount column lines up Include the numbering transaction, the print stylesheet and the storage rule.
What you lose
- A hosted history of every invoice you issued, which you would otherwise have to store yourself
- A template that already looks professional
- Currency and tax formatting handled for several countries
If you would rather not build
- A spreadsheet template, which many freelancers never outgrow
- Stripe Invoicing, if you already use Stripe
The escape hatch
open source · no votes, no paid placement
Crater
$0Self-hosted invoicing with clients, estimates and a customer portal.
crater-invoice-inc/craterfree · open source
Why this verdict
our own opinion · changed only by a person
92/100
Verdict yes at 92. An invoice is a form and a PDF. Gapless numbering and never regenerating an issued document are the two rules that matter.
History
tracked since 10 Aug 2026 · nothing is ever overwritten
Nothing recorded yet. This chart fills in once the page has visitors, votes or prompt copies — it will not draw a flat line to look busy.
Questions about Invoice Generator
answered from the record above
Is Invoice Generator free?
No — the plan we track is $10 a month. Around $10/month billed monthly for the account tier with saved clients and history.
Can you replace Invoice Generator by building your own?
YES. Replaceable in one session with an AI coding agent. Replacement score 92 out of 100, build time one session. Read what you lose before you decide.
How much does Invoice Generator cost?
$10 a month on Pro — $120 a year. Recorded 10 Aug 2026.
What do you lose by replacing Invoice Generator?
A hosted history of every invoice you issued, which you would otherwise have to store yourself; A template that already looks professional; Currency and tax formatting handled for several countries. If any of those carry weight for you, keep paying.
Is there an open-source alternative to Invoice Generator?
Yes: Crater, WeasyPrint. The prompt on this page is for when you want it your way instead.
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