Across the EU, e-invoicing has turned from a nice-to-have into the law. Germany already requires businesses to be able to receive structured invoices; from September 2026 every business in France — down to the solo micro-entrepreneur — must do the same; Poland's KSeF follows close behind. For a company with an accounting department, that's a project. For a freelance designer, a one-person consultancy, or a shop that has always sent a PDF from Word, it's a wall: their invoicing tool doesn't speak ZUGFeRD, Factur-X, XRechnung or Peppol.
Most of the tools that do speak those formats give it away for free — as the hook into a much bigger tax-filing subscription. Invonio is the opposite bet: a focused e-invoicing tool with nothing to lock you into, and honest, fixed pricing instead of a funnel. It's now open in beta, live at invonio.talivio.com, with a companion mobile app for issuing and checking invoices on the go.
One Invoice, Every Format the EU Asks For
Behind Invonio is a single canonical invoice model that exports to every format the mandates require: XRechnung in both its CII and UBL flavors, Peppol BIS 3.0 UBL for network delivery, and ZUGFeRD / Factur-X — the hybrid format where a human-readable PDF carries the machine-readable XML embedded inside it as a PDF/A-3 attachment. Enter the invoice once; download whichever standard the recipient or the tax authority needs. VAT is calculated and grouped exactly the way the EN 16931 European standard requires — including the cases most invoicing tools get wrong, like Germany's Kleinunternehmer (§19 UStG) exemption and intra-EU reverse charge, both handled as first-class options rather than an edit you have to fake.
Real Invoices, Not Just a First Draft
Invonio covers the parts of running invoices that only show up after the first one: line-item or document-level discounts, invoices with mixed VAT rates shown correctly rather than lumped into one line, automatic sequential numbering, editable drafts that lock the moment they're sent (a legal requirement, not a UI choice), and proper credit notes that reference the original invoice — the correct way to fix a mistake once a document is out the door.
Send It, Receive It, Keep the Proof
When Invonio sends an invoice — by email today, over the Peppol network as access-point partnerships come online — it archives the exact bytes that went out, fingerprinted with SHA-256, built to satisfy Germany's GoBD retention rules and EN 16931. Receiving is a first-class feature, not an afterthought: drop in an invoice you were sent, or point a Peppol provider or your accounting inbox at your personal Invonio delivery URL and let it arrive automatically. Either way it lands parsed and readable, whatever format the sender used.
API-First, So It Grows With You
The web app and the REST API sit on the exact same service layer — anything you can do by hand, you can automate. Mint your own bearer tokens from your account and reach the same endpoints a freelancer's browser hits: create invoices, generate documents, send them, pull incoming ones. A solo consultant clicks a form today; the WooCommerce store, the accounting firm running invoices for a hundred clients, or the SaaS embedding compliant invoicing reach for the same API tomorrow. Small customers are served without turning away the larger ones who show up later — that's the whole point of the Business tier.
Take It With You
Invonio also ships as a dedicated mobile app for iOS and Android — the same account, the same invoices, the same API underneath. Set up your business profile, build and send an invoice, preview the PDF, check what's landed in your inbox, and manage your account, all from your phone, in English, German or French with locale-correct dates and currency formatting.
Kurucu Fiyatı — No Free Tier, No Surprise Increases
Invonio never has a free tier — every account, from day one, is a real paying customer, because that's the only way to build something that doesn't need a bigger subscription hiding behind it to survive. In its place, the first 500 accounts get the Founding Price: €24/year, locked for as long as you stay subscribed. Everyone after that pays the list price of €39/year — still simple, still transparent, still a fraction of what a jump from a "free" e-invoicing hook to a full tax-filing subscription usually costs once the first year is over. The Business tier, for accounting firms and integrators who need the API and multi-client billing, is €29/month and isn't part of the introductory pricing — it's for the customers this architecture was built to not turn away.
Where It's Going
Invonio runs Germany and France side by side rather than one after the other, with Poland's KSeF next on the mandate calendar. Sending over the Peppol network is a configuration step away — the transport is built, and an accredited access-point partnership is what turns it on for live network delivery, including into France's accredited-platform requirement. From there: an EN 16931 conformance validator ahead of every send, and the mandate calendar rolling out country by country. The goal never changes: keep the smallest business on the right side of the law in about a minute, without asking it to buy a tax subscription it doesn't want.
