eustella

eustella.com

In-app purchases

About this app

eustella is the European AI Agent built for people who care where their data lives.
An AI-Chat that answers anything. An AI-Agent that gets things done. All in one private, mobile-first app, hosted in Europe and built under European law.
Ask anything, draft emails, brainstorm ideas, translate on the fly, summarise documents, plan your week, or just have a conversation - all powered by leading open weight AI models.

Why eustella

Built in Europe, hosted in Europe - your conversations stay under EU jurisdiction, with full GDPR compliance by design.
Private by default - no data sold, no advertising profiles, no AI training on your conversations without consent.
Fast, mobile-first - designed for your phone from day one, not a desktop tool squeezed onto a small screen.
Genuinely useful AI - write better, learn faster, get unstuck, work smarter. Whether you're drafting a message, researching a topic, or making a decision, eustella helps you think.

What you can do with eustella

AI-Chat: ask questions and get clear, sourced answers
AI-Agent: delegate tasks and let eustella handle them for you
Write and rewrite emails, messages, and documents
Translate between dozens of languages
Summarise long articles, PDFs, and notes
Brainstorm ideas, plans, and creative projects
Get help with code, math, and research
Talk through decisions with a thoughtful AI assistant

Made for Europe

Built by an Austrian team that believes Europe deserves its own world-class AI - one that respects your privacy, speaks your language, and follows your rules. eustella is part of a new wave of European AI built to give you a sovereign alternative to mainstream chatbots.

Download eustella and try the European AI assistant, AI-Chat, and AI-Agent built for you.

What’s new

eustella improved again - we can now provide up to 8x more tokens in every plan since our first launch.

We also reworked how our Agents work and much more, so go and check it out!