Legal
Company details
Ktesio is a software company in Rotterdam, registered with the Dutch Chamber of Commerce (KVK).
- Trade names
- Ktesio, astro90, Heronis
- Chamber of Commerce (KVK)
- 42172743
- Registered
- , in the Netherlands
- VAT ID (btw-identificatienummer)
- NL005556854B35
- Post address
- Postbus 21534, 3001 AM Rotterdam
- legal@ktesio.com
- Founder
- Islam Magdy
- Based in
- Rotterdam, the Netherlands
Open source
Ktesio’s open-source projects are licensed separately. The LICENSE file in each repository sets the terms. Hekma is licensed under the Apache License 2.0.
Brands
Heronis, a private AI agent that’s yours alone, and astro90, a small independent games label from Rotterdam, are trade names of Ktesio. Fibers, a Mac menu-bar time tracker for Fibery, is made by Ktesio. Fibers is not affiliated with Fibery.
This website
Text, design and the Ktesio name and logo © 2026 Ktesio. The site uses the Newsreader and JetBrains Mono typefaces under the SIL Open Font License 1.1. How the site handles personal data is described in the privacy statement.