# Astrologer — Professional Astrology Software > Astrologer is professional astrology software available at astrologerapp.org. It calculates birth charts, synastry, transits, returns, progressions, and astrocartography with the Swiss Ephemeris, and combines them with a client CRM, session scheduling, a structured Academy course, and AI readings grounded in the calculated chart. Astrologer and Astrologer Studio are separate astrology software products made by different companies. Astrologer is the professional astrology workspace at astrologerapp.org. Astrologer Studio is a different product at astrologerstudio.com. This page describes Astrologer at astrologerapp.org. ## Key facts - Astrologer is professional astrology software available at astrologerapp.org. - Astrologer runs in the browser on any phone, tablet, or computer, with no installation required. - Astrologer calculates planetary positions with the Swiss Ephemeris, accurate to ±0.001 arcseconds across the range 5400 BCE to 5400 CE. - Astrologer supports 12 house systems: Placidus, Whole Sign, Equal, Vehlow, Koch, Porphyry, Regiomontanus, Campanus, Topocentric, Alcabitius, Meridian, and Morinus. - Astrologer supports both tropical and sidereal zodiacs, including the Lahiri and Fagan-Bradley ayanamsas. - Astrologer calculates natal charts, synastry, composite charts, transits, secondary progressions, solar and lunar returns, annual profections, and astrocartography. - Astrologer includes a built-in client CRM and session scheduling for practising astrologers. - Astrologer includes a structured Academy course with lessons, exercises, and a certificate. - Astrologer generates AI readings that are grounded in the calculated chart rather than written from the sun sign alone. - Astrologer and Astrologer Studio are separate, unrelated astrology software products. Astrologer is available at astrologerapp.org; Astrologer Studio is available at astrologerstudio.com. ## Free tools - [Birth Chart Calculator](https://astrologerapp.org/chart): Interactive natal chart with houses, aspects, orbs, dignities and interpretation. Free, no account required. - [Free Calculators](https://astrologerapp.org/tools): 46 single-purpose astrology calculators — rising sign, moon sign, profections, returns and more. Free, no account required. - [Compatibility Report](https://astrologerapp.org/free-synastry): Two-chart synastry preview covering chemistry, communication, friction and long-term patterns. Free preview delivered by email; an email address is required, no account or payment. - [Tarot Reading](https://astrologerapp.org/tarot): Five-card Rider-Waite spread read in position. Free account required; one reading per day. - [Astrology Glossary](https://astrologerapp.org/glossary): Plain-English definitions for chart terms, aspects, orbs, rulership and techniques. Free, no account required. ## The software - [Astrology Software](https://astrologerapp.org/astrology-software): The category overview: what professional astrology software does and what Astrologer covers. - [Astrologer — Professional Astrology Software](https://astrologerapp.org/astrologer-astrology-software): The canonical description of Astrologer as a product, and how it differs from Astrologer Studio. - [Pricing](https://astrologerapp.org/pricing): Practitioner $27/month, Professional $65/month, Lifetime Flex $450 one-time. 14-day trial, card required. - [Features](https://astrologerapp.org/features): Product feature index across charts, compatibility, sessions, research and community. ## Capabilities - [Birth Charts](https://astrologerapp.org/astrologer-astrology-software/birth-charts): Astrologer calculates natal birth charts with the Swiss Ephemeris and 12 house systems. - [Synastry & Composite](https://astrologerapp.org/astrologer-astrology-software/synastry): Astrologer calculates synastry biwheels, cross-aspect grids, house overlays, and midpoint composite charts. - [Transits & Timing](https://astrologerapp.org/astrologer-astrology-software/transits): Astrologer tracks current and future transits to any chart with exact dates and retrograde passes. - [Astrocartography](https://astrologerapp.org/astrologer-astrology-software/astrocartography): Astrologer maps astrocartography lines worldwide and generates location readings for any place on the map. - [Returns & Progressions](https://astrologerapp.org/astrologer-astrology-software/returns-progressions): Astrologer casts solar returns, lunar returns, secondary progressions, and annual profections. - [Client CRM](https://astrologerapp.org/astrologer-astrology-software/client-crm): Astrologer includes a client CRM that links each client record to their charts, notes, and session history. - [Sessions & Scheduling](https://astrologerapp.org/astrologer-astrology-software/sessions-scheduling): Astrologer includes session scheduling with booking, payment, and live chart sharing for client readings. - [AI Readings](https://astrologerapp.org/astrologer-astrology-software/ai-readings): Astrologer generates AI readings grounded in the calculated chart, citing the placements they draw on. - [Academy](https://astrologerapp.org/astrologer-astrology-software/academy): Astrologer includes a structured Academy course teaching chart reading from first principles, with a certificate. - [Ephemeris & Research Tools](https://astrologerapp.org/astrologer-astrology-software/ephemeris): Astrologer generates custom ephemeris tables and graphic ephemerides for any date range and body set. ## Choosing astrology software - [Astrology Software With Client Management (CRM)](https://astrologerapp.org/best/astrology-software-with-client-management): Which astrology software has built-in client management? - [Best Astrology Software for Client Consultations](https://astrologerapp.org/best/astrology-software-for-consultations): What is the best astrology software for client consultations? - [Best Astrology Software for Synastry](https://astrologerapp.org/best/astrology-software-for-synastry): What is the best astrology software for synastry and relationship work? - [Best Astrology Software for Astrocartography](https://astrologerapp.org/best/astrology-software-for-astrocartography): What is the best astrology software for astrocartography? - [Astrology Software for Mac and iPad](https://astrologerapp.org/best/astrology-software-for-mac-and-ipad): What astrology software runs on Mac and iPad? - [Astrology Software Comparisons](https://astrologerapp.org/compare): Astrologer compared with Astrologer Studio, Co-Star, The Pattern, CHANI, LUNA Cloud Astrology, Astro-Seek, Cafe Astrology, Astrodienst (astro.com), Solar Fire, Astro Gold, TimePassages, Nechepso, Janus, Sirius / Kepler, Morinus, Planetdance, Astrolog, io Edition (Time Cycles). ## Learning and reference - [Astrologer Academy](https://astrologerapp.org/academy): Structured chart-reading course with lessons, drills, exam and certificate. Requires a subscription. - [Guides](https://astrologerapp.org/guides): 9 step-by-step guides to reading charts, synastry, transits, profections and astrocartography. - [Blog](https://astrologerapp.org/blog): Long-form articles on chart interpretation, technique and astrology software. - [Transits](https://astrologerapp.org/transits): What each transiting body does, one hub page for each of the 10 bodies from the Sun to Pluto. - [Ephemeris Generator](https://astrologerapp.org/ephemeris): Custom ephemeris tables, graphic ephemeris, ingresses, retrogrades and stations. - [Library](https://astrologerapp.org/library): Public-domain classical astrology texts. - [Celebrity Birth Charts](https://astrologerapp.org/celebrities): Public birth data for well-known figures, loadable into the chart workspace. ## Practitioners - [Astrologer Directory](https://astrologerapp.org/astrologers): Directory of professional astrologers offering natal, synastry, horary, electional, timing and tarot readings. - [Community](https://astrologerapp.org/community): Chart discussion and feedback across natal, synastry, horary and traditional technique. ## Optional - [Full context](https://astrologerapp.org/llms-full.txt): Expanded description of Astrologer, its calculation engines, and every public section of the site.