About
A precise astrology instrument.
Most astrology apps are entertainment software in cosmic wrapping: a sun-sign template, the same paragraph for millions of people. Kalendom is built the other way around — as an instrument, with the method in the open.
The method.
Real sky, real houses. The Kalendom engine runs on Swiss Ephemeris positions — the same library professional astrologers use — and real Placidus house cusps derived from your exact birth time and place. Nothing is looked up from a template; every chart is your chart.
A rulebook with receipts. Of everything astrology contains, one tradition exists to answer a single question — when. The scoring rulebook encodes that transit-timing tradition, roughly four centuries of it, and every weight in the file is traceable to its doctrinal source. No rule exists because it "felt right"; each one cites where it comes from.
Versioned determinism.The rulebook is versioned, and a day's score is reproducible: same birth data, same date, same rulebook version — the same result, forever. When the rulebook changes, the version changes with it. There is no hidden adjustment layer and no randomness anywhere in the scoring path.
Honesty rules, enforced in code. When the birth time is unknown, the chart degrades openly — houses and rising sign are left out and the interface says so, rather than guessing. Curves never invent a peak between real days. Tied days share their rank instead of receiving a false ordering. And a quiet day is reported as a quiet day — our astrology engine admits when nothing notable is happening, and when it misses, that stays visible in your backtests too.
Who makes this.
Kalendom is built by an independent software engineer in Italy. The work is deliberately method-first: the credibility of this product should stand on what you can verify — the positions, the cited rulebook, the reproducible scores — not on anyone's biography.
The honest deal.
Past dates are free for everyone, forever. Forward-looking views — your timeline of upcoming supportive and demanding days, the loaded-periods explorer, the timing PDF — open with a one-time unlock: pay once for the window you want, no subscription. No ads, no upsells inside the free flow, no email harvesting.
Don't take our word for it.
Run the Kalendom engine on a day you already lived — the backtest is free, no sign-up.