kalkül alternative
Billy vs. kalkül: is paying worth it against a free tool?
kalkül is an Austrian invoicing tool from Linz whose core features are permanently free — a fair starting point for a one-person business that just needs BAO-compliant invoices. Worth knowing for context: kalkül advertises no AI features on its site, and reminders are sent manually.
That is exactly where Billy starts: the AI assistant creates invoices from one sentence, watches open items and sends payment reminders automatically. Billy also covers Austria AND Germany in one account — kalkül states an explicit focus on Austria alone.
Why freelancers move from kalkül to Billy
A free tool gives you a form. Billy gives you an assistant — and it keeps working after the invoice has gone out.
- An invoice from one sentence instead of filling in a form — kalkül has no AI features
- Automatic dunning: the assistant sends reminders itself; in kalkül you click every reminder manually
- Recurring invoices in one sentence — not advertised by kalkül
- Austria and Germany compliant in the same account (§11 öUStG / §14 UStG)
- Colors, fonts and layout from the first plan — in kalkül those are for paying supporters only
Billy vs. kalkül at a glance
| Billy | kalkül | |
|---|---|---|
| AI & automation | ||
| Create an invoice from an AI prompt | Yescore feature | Nono AI features on the vendor site |
| Automatic dunning | Yesfrom the entry plan | Noreminders are sent manually |
| Design & interface | ||
| Live preview while typing | Yes | Partiallylive preview in the design editor, not the invoice form |
| Custom branding | Yeslogo, colors, layout | Partiallylogo free; colors & layout for paying supporters only |
| Invoicing workflow | ||
| E-invoicing (XRechnung/ZUGFeRD/ebInterface) | NoPDF invoices | Nonot offered |
| Countries, bookkeeping & price | ||
| Austria | Yes§11 öUStG preconfigured | YesBAO-compliant, small business |
| Germany (§14 UStG) | Yessame account | Novendor states an explicit Austria focus |
| Price | from €9 / month, 7-day free trial | core features permanently free; supporter subscription price not public |
kalkül pricing and feature claims per the vendor, verified on July 31, 2026. Prices net; subject to change.
When kalkül is the better choice
To be fair: kalkül is a genuinely good free offer for a one-person business in Austria — invoices, the small-business rule, BAO compliance and even cash-basis accounting cost nothing, and the vendor commits to keeping existing accounts' free features free. If you write a handful of invoices a month, chase them yourself and work only in Austria, you do not need Billy.
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