Mizzox
KSeF e-invoicing with live bank sync for Polish micro-firms
Mizzox is a Polish invoicing and document platform built around the mandatory KSeF e-invoicing system that applies to businesses from 2026. It issues a KSeF-compliant invoice in about 30 seconds, syncs in real time with more than 50 Polish banks to mark invoices as paid, sends automatic email and SMS reminders with statutory interest, and can initiate payments from the platform. It offers a free tier and claims more than 16,500 active companies.
Our reading. Best for Polish micro-shops and service businesses that need KSeF compliance in 2026 without paying for full accounting software.
Strengths
- Free plan and very low paid tiers for micro-businesses
- Real-time bank synchronisation and automated dunning
- KSeF compliance built in ahead of the 2026 obligation
Limits
- Poland only
- Generic invoicing tool; no restaurant-specific reports or POS links
Company dates from 2014 but the KSeF platform launched around 2024; self-funded, small team, freemium model
Mizzox S.A. (KRS 0001123058), converted from a 2014 sp. z o.o.; president Przemysław Kot; servers in Poland and the EU; AI search across documents
- https://mizzox.com/
- https://strefabiznesu.pl/polski-startup-chce-zrewolucjonizowac-zarzadzanie-firmami/ar/c3p2-27669737
- https://www.bizraport.pl/krs/0000493762/mizzox-spolka-z-ograniczona-odpowiedzialnoscia