What it is
Solar Fire is a Windows desktop astrology program from Astrolabe Inc., originally released in 1992 and now at version 9.0. Astrolabe started shipping astrology software for the Apple II in 1979, and Solar Fire has been the company's flagship since the Windows 3.1 era. The codebase is roughly 30 years old, written in Delphi, and runs natively on every Windows release from 95 to 11. Each major version (5, 6, 7, 8, 9) ships every 4 to 6 years with a paid upgrade fee. Solar Fire dominates the working-astrologer desktop market in the United States and the UK, and Astrolabe's domain alabe.com pulls roughly 25,000 organic visits a month, mostly to the free chart calculator at /freechart/.
Who uses it
Solar Fire is the program practicing astrologers reach for when they have been in the field for at least 5 years and run traditional or Hellenistic research alongside client work. Roughly 40 percent of teachers in classical astrology programs (Astrology University, Kepler College alumni networks) cite it as their daily driver. The typical Solar Fire user works on a Windows desktop with no immediate plan to switch, runs charts offline, and writes their own custom report layouts in the report designer.
Headline features
- Primary directions with 6 methods (Placidus mundo, Placidus zodiacal, Regiomontanus, Campanus, Topocentric, Naibod-key), still unmatched in any other commercial program
- 30 plus house systems including Carter Poli-Equatorial, Pullen SR, Pullen SD, APC
- Bespoke report designer with full layout control
- Swiss Ephemeris core, accurate to better than 1 arc-second against NASA's DE431
- Tri-wheels, dynamic age progressions, dial sets for cosmobiology and Uranian work
- Native Windows, no Mac build, no cloud sync
Headline price and 5-year cost
The base license is $360 one-time, single-machine. Major upgrades cost $80 to $120 every 4 years, and paid add-ons (asteroids, primary directions module) run $40 to $120 each. Mac users add roughly $99 a year for Parallels Desktop or accept a BootCamp partition. The realistic 5-year total comes to $520 to $700 for a working practitioner who upgrades once and buys at least one add-on.
Where Astrolium does it differently
Astrolium does not replace Solar Fire's primary directions module — that remains the strongest argument to keep Solar Fire installed if traditional research is your method. What Astrolium adds, and Solar Fire does not ship, is the client side: a CRM with intake forms and session notes, shareable client links the client opens in their own browser, and the live predictive scrubber that recomputes profections, Zodiacal Releasing, and transits as you drag the timeline.
The other difference is platform. Astrolium runs in any browser on Mac, Windows, iPad, and Android, which removes the Parallels tax for the roughly 35 percent of US working astrologers on Apple hardware. Same Swiss Ephemeris core, identical positions to the arc second, plus 20,000 plus named asteroids in every plan instead of as a paid module.
For pricing context, Astrolium Adept is $29 a month or $24.17 a month on the annual plan ($290/year), billed against a different value proposition: not a one-time license, but a client workspace that replaces 3 to 5 patched-together tools (Calendly, Notion CRM, Canva for PDF reports, a separate scheduler).
If you are moving from Solar Fire
The head-to-head walkthrough (calculation parity, migration steps, the cases where Solar Fire still wins) lives at Solar Fire vs Astrolium. Solar Fire's .SFCHT files import to Astrolium in 1 drag-and-drop; the largest migration on record covered 14,000 charts in 4 minutes. For Astrolium's pricing and the features hub, the links go directly to the working surfaces.
Start with the migration wizard if you want a 45 minute parallel session with the team.