Cogna – Your AI teacher for stress-free exam prep. Write exam tickets in Markdown, get instant AI summaries, and receive feedback on your answers — all from a clean dashboard that tracks your knowledge.

Stop losing ideas in phone notes.

Write your thoughts in Jetna — a clean, beautiful tool for managing what matters.

• Tree-structured notes – Create threads of any depth, from fleeting ideas to complex projects.
• Instant sharing – Share specific branches or whole trees with others, hassle‑free.
• Full keyboard control – No mouse needed for power users. Your thoughts grow like trees. Jetna helps you see the forest.