Comparison
Factual, sourced comparison — last updated June 2026.
Kleos is the legal practice software from Wolters Kluwer, a global legal publisher. KAIUS is a newer SaaS alternative, built around a native AI assistant and a public price from €19.
| Criterion | KAIUS | Kleos |
|---|---|---|
| Deployment model | SaaS cloud | SaaS cloud (Azure) |
| Entry price (user/month) | €19 (Studio) — public | Quote-based (~€69 in BE/NL) |
| Free trial | 14 days, no credit card | 30 days |
| Hosted in Europe (GDPR) | Yes (EU) | Yes (Azure EU) |
| Native generative AI | Yes — native assistant + drafting | Yes — Kleos Expert AI (optional) |
| Microsoft Word integration | Yes (Word add-in) | Yes |
| OneDrive / SharePoint | Yes (OneDrive + SharePoint) | Yes (Microsoft 365) |
| Outlook | Yes (Outlook add-in) | Yes |
| Mobile app | Responsive web (iOS/Android) | iOS + Android |
| Primary audience | FR / BE / LU firms — AI-first | SME law firms across Europe |
Yes. KAIUS starts at EUR 19/user/month with AI included. Kleos public price lists (BE/NL) start around EUR 69 excl. VAT, without the AI module. Over three years the gap often exceeds EUR 1,800 per user.
At KAIUS, the AI assistant and AI drafting are native from the first plan. At Kleos, 'Expert AI' is an additional module billed separately.
No: public pricing, no quote, no long-term commitment. Kleos is mostly sold by quote with multi-year contracts.
KAIUS is an independent vendor shipping AI updates continuously. Kleos follows the product cycles of a large group, which are slower.
Every data point comes from the vendor's website or an independent review platform. Last updated: June 2026.