What is Horoscho Chart?
Horoscho Chart is an astrology web app that calculates and displays horoscopes from birth data with high precision. It is built on the astronomical computation library Skyfield and JPL ephemeris data (DE440 / DE441), the same data used in professional astronomy.
The app runs at toolbox.horoschola.jp and works in any modern browser — no installation required. It is free for everyone — no ID or password needed.
Main Features
Natal Chart
Single-wheel chart with aspects, house systems, and detailed position data.
Bi-Wheel
Compare two charts — transits, progressions, synastry — in a double wheel.
Tri-Wheel & 5-Wheel
Layer up to five charts to read multiple techniques at a glance.
Timing Table
Tabular view of exact transit and progression hits for timing work.
Declination Graph
Visualize declinations, parallels, and out-of-bounds planets over time.
Midpoints & Harmonics
MP/HM screens for midpoint trees and harmonic charts.
Analysis Graph
Graphical chart analysis to grasp a chart’s overall balance quickly.
Graphic Ephemeris
Monthly graphic ephemeris for reading planetary movement visually.
Void Calendar
Void-of-course Moon calendar for everyday electional use.
LIFELOG
Record life events and review them against your chart over time.
Flexible Input
Birth-data input with place search, time zones, and historical dates.
Rich Settings
House systems, orbs, bodies, colors — tune the app to your practice.
Pricing
Chart creation stays free
No ID or password. Bi-wheels, timing tables, graphic ephemeris, LIFELOG, and more — all free to use.
AI Readings (paid subscription)
From handwriting to desktop software — and now to AI. Based on your chart, the AI writes a reading, and you can keep asking follow-up questions in conversation. Everything runs from a single button, so the prompt is never exposed.
A single in-person or phone reading often costs far more than a month of AI Readings. For the price of one traditional session, you can consult the AI almost every day.
Basic
$3 / month
- Up to 35 AI Readings per month
- One-button readings — the prompt is never exposed
- Cancel anytime
Pro
$10 / month
- Up to 160 AI Readings per month
- Also references the chart data behind each reading
- One-button readings — the prompt is never exposed
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What is sent when you 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.
About & Contact
Horoscho Chart is developed by prema, a professional astrologer with 30 years of experience in Western astrology. Read more about prema, or get in touch with any questions.