Frequently asked questions about Horoscho Chart. If your question isn’t answered here, please contact us.
About the app
What is Horoscho Chart?
Horoscho Chart (Astrologer’s ToolBox) is a professional astrology web app. It calculates natal charts, bi-wheels, tri-wheels & 5-wheels, timing tables, declination graphs, midpoints & harmonics, graphic ephemerides, void calendars, and more — all in your browser.
Do I need to install anything?
No. The app runs entirely in your web browser at toolbox.horoschola.jp. There is nothing to download or install, and it works on Windows, Mac, and tablets. A PC with a larger screen is recommended for chart work.
How accurate are the calculations?
The app is built on the astronomical computation library Skyfield and JPL’s high-precision ephemeris data — the same data used in professional astronomy. Positions agree with Swiss Ephemeris / astro.com within one arc-minute.
What languages does it support?
The app interface is available in English and Japanese. Manuals are provided in English (this site) and Japanese (iprema.net). For other languages, your browser’s automatic translation works well.
Price & access
How much does it cost?
Chart creation is free for everyone — no fee and no account to create. Just open toolbox.horoschola.jp/app/ and start using it. AI Readings are an optional paid subscription: Basic is $3/month (up to 35 readings) and Pro is $10/month (up to 160 readings).
Do I need an ID or password?
No — chart creation requires no login at all. Only AI Readings need sign-in, and that uses a one-time link sent to your email, so there is still no password to remember. If you used a paid version before, your old ID and password are simply not needed anymore.
Why is it free now?
We are evolving Horoscho Chart toward AI-assisted chart analysis, built so that your personal data stays private. As part of this restart, we opened the app to everyone.
Can I use the app on multiple devices?
Yes. The app works in any modern browser — PC, laptop, and tablet. Note that your saved data is stored in each browser separately; use Export / Import to move data between devices.
Where is my data stored?
Your birth data and saved charts are stored only in your own browser. They are never sent to our server.
AI Readings
What are AI Readings?
AI Readings is an optional paid feature. Based on your chart, the AI writes an interpretation, and you can keep asking follow-up questions in conversation — like talking with an AI astrologer, rather than getting a single fixed answer.
Is my personal data safe when I use AI Readings?
Readings are generated with Google’s Gemini API. When you press the AI Reading button, your chart data (birth date, time and place, and the calculated positions) and anything you write in the “on your mind” field are sent to it through our own server. Your name is not sent unless you switch that option on. Nothing is sent until you press the button, and the charts you save stay in your own browser. See our Privacy Policy for details.
Can I use AI Readings on both my phone and my computer?
Yes. A subscription belongs to your email address, not to a device, so there is no device limit and nothing to buy twice. Each device just needs to sign in once.
To add a device, open the login page on it and enter the same email address. Opening the link on that device signs it in.
Two things to keep in mind:
- Open the link on the device you want to use. If the email arrives on your phone but you want to work on your computer, open that link on the computer (each link works once and lasts 15 minutes)
- Browsers count separately. Chrome and Edge on the same computer each need their own sign-in
Your reading count is shared across devices, not per device. On Basic that means 35 readings a month in total.
How do I subscribe or cancel?
Open the account page and choose Basic ($3/month) or Pro ($10/month). Sign-in uses a link sent to your email — no password to remember. You can cancel anytime from the same page; billing and your usage count reset each billing cycle.
Support
How do I get support?
Support is provided by email through our contact form, in English or Japanese. We usually reply within a few days. Please note we do not offer phone support.