Open-source components and licenses
Astrologer Studio uses Astrologer API v6 for astrological calculations and chart generation, powered by Kerykeion and libephemeris. These three projects are available under the GNU Affero General Public License v3 (AGPLv3).
Source code and licenses
Read, download or explore the history of each project. No Studio account or subscription is required to access these sources.
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Astrologer API v6
The API service Astrologer Studio uses for astrological calculations and chart generation.
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Kerykeion
The astrology engine behind the API, turning astronomical positions into charts, houses and aspects.
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libephemeris
The ephemeris library used by the calculation engine for astronomical positions and source metadata.
What AGPLv3 means
AGPLv3 allows you to use, study, modify and redistribute the covered software under its terms. If you modify an AGPL-covered program and let users interact with it over a network, the license requires you to offer those users the Corresponding Source of that modified version.
This summary does not replace the full GNU AGPL v3 license. Each project's license and notices govern its use. Public repository links are not a guarantee that the latest default branch matches the version deployed by the service.
What is open source — and what is not
These disclosures cover the API and calculation libraries listed above. Astrologer Studio v2, the web application and hosted product, remains proprietary; this page does not release it under AGPLv3. This does not limit the rights granted by the licenses of the open-source components.
Source code is not user data. Publishing these projects does not publish your account details, saved charts or birth data.
Maintaining these tools
We maintain Astrologer API, Kerykeion and libephemeris. Subscriptions support the hosted Studio and continued development of these tools. Access to their public source code does not require a paid subscription.
The original Astrologer Studio
Astrologer Studio v1 remains publicly available under its own license. For product updates, visit our blog.