Billy is now Backbone: time tracking, invoices, dunning, receipts and the export for your bookkeeper in one app. Tell Billy, the AI assistant, what to bill. He drafts the invoice and asks before anything is sent.
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Billy wrote invoices. Backbone also handles your time, dunning, receipts, bank statements and the hand-off to your bookkeeper, for freelancers, studios and agencies in Germany and Austria.
Timer or manual entries, hours against each client's target, and the hours go straight onto the invoice.
Write on the page and send by e-mail with the PDF. Mandatory-detail check for §14 UStG (DE) and §11 UStG (AT), reverse-charge (§13b) and Kleinunternehmer (§19) notes, payment QR code, ZUGFeRD, recurring invoices, credit notes, in German or English.
Automatic payment reminders, first and second notices in your wording, statutory interest and the €40 late fee where the law allows. Stops once the invoice is paid.
Rate, payment terms, projects, monthly budget, retainer and your team’s hours per client.
Upload a PDF or photo: the AI reads vendor, date, amount and VAT and matches the receipt to its bank or card payment.
Upload a PDF or CSV and see at a glance which months are still missing.
One named ZIP with receipts, sent invoices, statements and a CSV report, a share link, or a free Bookkeeper login (1 per workspace).
Hours, revenue, profitability and utilisation, also as CSV.
Billy lives on as the AI assistant in Backbone: he works in German or English on your real data and asks before anything is sent.
Use Backbone right from ChatGPT, Claude, Gemini, Grok or Claude Code.
Set your details once; every invoice after that comes from your hours or from one sentence to Billy.
7-day trial, card on file at Stripe, €0 due today. Used Billy? Sign in with the same e-mail and password.
Company, IBAN, tax number, logo. Backbone puts them on every invoice.
Add hours from time tracking or tell Billy in a sentence. Backbone checks the mandatory details and sends it by e-mail with the PDF.
What a complete invoice looks like, in several looks. In Backbone you write the invoice right on the page, with the Basic and Minimal templates.
A nostalgic template styled like it was created on a typewriter
A clean, minimalist template with a light gray background
A traditional business look with a serif letterhead — ideal for established freelancers and consultants
A bold, colorful header band with a clean sans-serif body — great for startups and US freelancers
An elegant, minimal template with generous whitespace and thin rules — made for creatives
A premium, colour-accented invoice with your logo, accent header and signature block — the most complete layout Billy offers
7-day trial, €0 due today. All prices include VAT, no setup fee, no minimum term.
For freelancers who run the whole business themselves.
Start free trialFor small studios with a team and a handful of retainers.
Start free trialFor agencies that want room for every person and project.
Start free trial