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Selecting the right KSeF software requires looking beyond simple integration promises. Starting February 1, 2026, all companies must receive structured invoices, and most must issue them starting April 1, 2026. Learn how to evaluate vendors on critical features like offline24 mode, certificate authorization, and transaction limits.
Most KSeF software comparisons stop at the pricing page and a feature list. That is not enough. Below are eight questions that actually separate the tools: FA(3) schema support, authentication method, behaviour during a KSeF outage, purchase invoice retrieval, error readability, team permissions, data export, and what the subscription really covers. Ask them during the demo, not after rollout.
inFakt is a mature Polish accounting ecosystem with a free KSeF plan. If you run a single Polish entity and want the cheapest way to issue invoices, inFakt is hard to beat, and we will say so plainly. Biurko.io solves a different problem: many companies in one panel, certificate-based KSeF authentication instead of tokens, readable KSeF error messages, and a Ukrainian-language interface. Here is how to tell which one you need.
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