InvoYX: the offline FastBill alternative
The best FastBill alternative for tradespeople is InvoYX — a fully offline invoicing app with ZUGFeRD 2.2 e-invoices, DATEV export, quotes and dunning. FastBill is browser-based cloud invoicing; InvoYX runs on your phone with no connection and no account.
The short version
FastBill suits desk-bound, browser-first invoicing. InvoYX suits the tradesperson who needs the invoice ready on site, offline, with ZUGFeRD and DATEV in one flat price.
FastBill vs. InvoYX: how they compare
| FastBill | InvoYX | |
|---|---|---|
| Price | Cloud subscription, tiered plans | 7-day free trial, then €12.99/month — flat |
| Works offline | No — browser-based | Yes — fully offline |
| ZUGFeRD 2.2 / Factur-X | Yes | Yes — every invoice |
| DATEV export | Yes | Yes — CSV batch |
| Quotes & credit notes | Yes | Yes |
| Dunning | Yes | Yes — 3-stage |
| Languages | German + English | 27 languages |
| Platform | Web browser | iOS + Android app |
When FastBill is the better choice
FastBill is a solid browser invoicing tool for people who work from a laptop at a desk.
When InvoYX is the better choice
InvoYX is an app that lives on your phone, works without internet, and includes ZUGFeRD, DATEV, quotes and dunning in one flat monthly price — with all data on the device.
5 reasons to switch
- Invoice on site, offline, no browser needed.
- ZUGFeRD e-invoices and DATEV export in one flat price.
- 27 languages, document language independent of app language.
- Quotes, credit notes, recurring invoices and dunning built in.
- No account, no cloud, AES-256 encrypted backup.
Frequently asked questions
Is InvoYX a good FastBill replacement?
For invoicing on the move, yes — InvoYX covers invoices, quotes, dunning, ZUGFeRD and DATEV, offline. FastBill remains an option if you prefer a desktop browser workflow.
Does InvoYX work offline?
Yes — everything runs in a local database on your device; you only need a connection to send the finished PDF.
Try InvoYX free for 7 days
7-day free trial, then €12.99/month. Cancel anytime. No cloud, no account.
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