Your license to use Ephemeris Lab.

Effective October 3, 2026

The product and its developer

Ephemeris Lab is downloadable desktop astrology software developed by Kasra Rahjerdi. It calculates and displays charts and stores your chart library on your computer. Contact hi@ephemerislab.app with product, license or purchase questions.

What your license covers

A purchased license gives one person a non-exclusive right to install and use the purchased major version across their own computers, including in their professional practice. There is no per-chart or per-client charge. Each additional person needs their own license; contact us about group licensing.

You may print, export and share your chart readings and outputs. You remain responsible for permission to use and share other people’s birth details and notes.

Purchased versions and updates

Your purchased version is perpetual and does not require a subscription or periodic online activation. Minor updates within that major version are included. Future major versions may be sold separately; upgrading is optional. Continued use of your purchased version does not guarantee compatibility with future operating systems or permanent availability of optional online services.

Purchases and delivery

The listed personal license price is $299 USD, paid once. Applicable taxes and the final payable amount are shown before payment. The purchase confirmation identifies the seller, the version and the delivery method. Keep your receipt and license key. Do not send payment-card information by email.

FastSpring purchases are subject to FastSpring’s purchaser terms. The refund policy applies to voluntary refund requests and preserves mandatory consumer rights.

Restrictions and ownership

The software is licensed, not sold. Kasra Rahjerdi retains ownership of Ephemeris Lab and its source code. You may not share, resell or publish your license key, distribute the software to others, or use one personal license for multiple people. You may not copy, modify or reverse engineer the software except where applicable law permits it. Third-party components retain their own licenses and notices, which accompany the app.

Refunds and withdrawn licenses

If a purchase is refunded, reversed or found to be fraudulent, its license may be withdrawn and you must stop using that license. Being offline does not expire a valid purchased license.

Use and support

Astrological interpretation is your responsibility. Ephemeris Lab is not medical, legal or financial advice. Calculation comparisons describe the tested inputs and methods; they are not a guarantee for every chart or interpretation. Contact us if a supported feature does not work as described.

To the extent permitted by law, the software is supplied without additional warranties and we are not liable for indirect or consequential losses. Nothing in these terms excludes rights, warranties, remedies or liability that applicable law does not allow us to exclude.

Privacy and changes

See the privacy policy for local chart storage, optional connections and purchase information. The terms presented for your purchase apply to that purchase. We will publish and date any later changes; they do not remove mandatory rights or the perpetual right to use a valid purchased version.