Greco-Roman astrology
Western Synastry
Where you ignite, soothe, and clash.
Sun, Moon, Venus, Mars aspects across the charts. Chiron wounds, lunar nodes, vertex contacts, house overlays.
imotionengine Β· Compatibility
Stress test your compatibility
with others.
Enter birth data and compare compatibility using five ancient systems, modern biorhythm science, and Kalki, the archetype system. Each returns their own verdict. We combine them into one overall score. Nothing softened. No sign-up.
Inside the seven readings
Each one looks at the same charts through a different lens. The overall score is what survives all seven.
Jyotish, sidereal
Vedic Kundli Milan
The 36-guna score the Indian grandmothers run.
Full Ashtakoot eight-koota match. Manglik dosha cancellation rules, Nakshatra pada compatibility, Spouse Palace, Dasha Sandhi windows.
Four Pillars of Destiny
Chinese BaZi
Your Day Master meets theirs.
Year, Month, Day, Hour pillar interactions. Day Master pair table, Stem Combinations, Spouse Palace ε ε² clash, secret friend.
Tzolkin sacred calendar
Mayan Day-signs
Mirror, polar opposite, or analog ally.
260-day Tzolkin sign plus the 13 Galactic Tones. Same-sign twins, antipodes, color-family resonance, and tone-pair harmonics.
Pythagorean system
Numerology Life Paths
The full Life Path interaction matrix.
Life Path Γ Life Path on the canonical Pythagorean matrix. Expression and Soul Urge layers kick in when names are added.
Bio-cycle system
Biorhythm Sync
The one row that updates daily.
Physical 23-day, emotional 28-day, intellectual 33-day cycles, plus four extended cycles. Mutual critical days flagged.
The synthesis of the other six
Kalki Archetype
What the other six readings agree on when you crystallise them.
Kalki takes the outputs of the six readings above (planets, Nakshatras, pillars, Tzolkin, life-path, biorhythm) and resolves them into nine cross-engine nodes. Each person lands as one of seven archetypes: Sovereign, Architect, Beacon, Resonator, Navigator, Catalyst, Mirror. That gives 28 unique pair-keys, each with forty-eight test-audience calibrated paragraphs.
Test your compatibility
Each birth date opens a chart. Add times, timezones, places, and names if you have them, the readings sharpen with each one. Skip what you do not.
How each reading sees the chemistry
Every other app shows you a single reading. One tradition speaks, nobody fact-checks it, and you walk away hearing whatever flatters or frightens you most. imotionengine runs all seven against the same birth data at the same time. A high Western score that the Vedic side flatly disagrees with shows up as real friction, not a polished 92 percent. The overall fit is the weighted average across all seven. A single-engine misread has nowhere to hide.
Western Synastry
Placidus or Equal house options on your natal chart. All ten planets cross-aspected, sorted by orb tightness so the tightest hits surface first. Your free reading surfaces your planets landing in theirs: Chiron synastry (where your planets activate their wound), Lunar Nodes (your planets pulling on their karmic axis), Vertex contacts (the relationship's appointment), and house overlays (your planets in their life-domain houses). The full Western reading on your dashboard adds the mirror direction: their planets landing in yours, completing the synastry from both sides. Tightest contacts surface as named patterns, not generic placeholders.
Vedic Kundli Milan
The full 36-guna Ashtakoot match across all eight kootas. Sidereal Lahiri ayanamsa. Manglik dosha checked from Lagna, Moon, and Venus, with up to ten classical cancellation rules including the cross-chart partner-Venus-in-Kendra softener. Spouse Palace (7th-lord dignity), Dasha Sandhi windows when one person's period is winding down, and the Navamsha D-9 overlay when birth times are present.
Chinese BaZi (Four Pillars)
Full Four-Pillars compute with the Li Chun year boundary, not Chinese New Year. Year, Month, Day, Hour pillar interactions. Day Master compatibility on a 100-pair table with the Wu Xing generating and controlling cycles. Stem Combinations (倩干ε), Spouse Palace ε ε² clashes, secret friend (ε ε) and affinity triangles (δΈε) all surface when they fire.
Mayan Day-signs
The 260-day Tzolkin cycle (20 day signs cycling against 13 Galactic Tones). Relationships classified across seven sign buckets: same sign, analog ally, antipode (polar opposite), same color family, compatible, challenge, and neutral. Tone-pair harmonics layer on top across five buckets: perfect tempo sync (matching tones), polar completion (tones sum to 14), same tone family (Creative 1-4, Reflective 5-8, or Self-Regulating 9-12), transcendent asymmetry (one partner on tone 13), and working pair (different families).
Numerology Life Paths
Life Path Γ Life Path on the canonical 45-pair Pythagorean matrix. When everyone's names are entered, the Expression and Soul Urge layers kick in for a full multi-layer composite. Karmic Debt numbers (13, 14, 16, 19) surface as penalties; Karmic Lesson complementarity (where your missing digit shows up as another person's strength) surfaces as a bonus.
Biorhythm Sync
Physical 23-day, emotional 28-day, intellectual 33-day cycles, plus four extended cycles (intuitive, aesthetic, awareness, spiritual). Mutual critical days for the next two weeks surface as concrete dates, not abstractions. This is the one row on the card that updates daily, so the same chart group re-reading next month gets a fresh biorhythm read while the other six stay locked.
Kalki archetype
Kalki is not a seventh tradition sitting alongside the other six. Kalki is the synthesis OF the other six. The Western planets and aspects, the Vedic Nakshatras and Dasha lord, the Chinese Four-Pillars stem and branch, the Mayan Tzolkin sign, Galactic Tone, and Tree-of-Life Oracle (analog and destiny day-signs), your numerology Life Path, Expression, Soul Urge, and Karmic Lessons, your biorhythm solar-epoch frequencies at birth (physical 23-day, emotional 28-day, intellectual 33-day, aesthetic 43-day) and your position in the grand cycle, all feed into one place.
That synthesis resolves into a nine-node profile (Crown, Logic, Expression, Identity, Willpower, Sacral, Root, Connection, Creativity), each node independently scored as Core (you produce that energy consistently) or Receptive (you absorb it from the environment). The dominant pattern across those nine nodes places each person as one of seven archetypes: Sovereign, Architect, Beacon, Resonator, Navigator, Catalyst, Mirror. Compatibility runs across the 28 unique archetype interactions, with forty-eight test-audience calibrated paragraphs per interaction, surfaced one at a time via a deterministic rotation so everyone reading the same chart group always sees the same paragraph. The score is modulated by shared lit circuits and node bridges across the blueprints. When the other six readings disagree on what the dynamic is, Kalki is the row that tells you what they collectively settle on.
The headline here is free. The paragraph-depth read on each engine, plus the live calibration system that shows which traditions actually predict outcomes for you, sit inside the app. Open the dashboard after running this to go deeper on any single reading.
Adopt a Kalki from your reading
Every reading here can take a body you keep. A Kalki is a small living companion, born from your own chart. Its colour, its markings, the way it listens, all of it is drawn from the same readings that shaped your compatibility, so no two are alike and yours stays yours.
It is free, and it drifts in its own quiet corner of space. You feed it, play with it, teach it a song, bury a message for later, and send one line notes travelling the world through it. The more you come back, the more it grows.
Best of all, you can link Kalkis with the people you test here. Run a reading with a friend or partner, send them a private invite, and when they adopt their own Kalki the two begin to orbit each other, a shared light that brightens the more you both return. Private and consent only, never a public list.
See the full engines
What you read here is the free headline. Behind each of the seven readings is a full engine inside imotionengine, with far more depth: day by day forecasts, transit and dasha timing, the calibration system that learns which traditions actually predict your life, and your living Kalki. It is free to start.
Free compatibility readings, by sign and system
These are free, shareable readings we made for a single system:
SynastryNumerology compatibilityChinese zodiac compatibilityVedic compatibilityMayan compatibilityBiorhythm compatibilityFriendship and group compatibility
Or read a sun-sign pairing. Every combination has its own free reading:
Aries compatibility, all 12 pairings
Taurus compatibility, all 12 pairings
Gemini compatibility, all 12 pairings
Cancer compatibility, all 12 pairings
Leo compatibility, all 12 pairings
Virgo compatibility, all 12 pairings
Libra compatibility, all 12 pairings
Scorpio compatibility, all 12 pairings
Sagittarius compatibility, all 12 pairings
Capricorn compatibility, all 12 pairings
Aquarius compatibility, all 12 pairings
Common questions about compatibility
What is a compatibility calculator?
A compatibility calculator compares two people's birth data and scores how well they fit. imotionengine runs seven readings at once, five traditions, modern biorhythm science, and your Kalki archetype, then combines them into one honest overall verdict.
Is the compatibility test free?
Yes. The full seven-reading compatibility test is free and needs no sign-up. Enter two birth dates and read your result right away.
Do I need a birth time to check compatibility?
No. A birth date is enough for a reading. Adding birth time, place, and name sharpens the astrology, Vedic, and Chinese layers, but every reading still works without them.
Can I check friendship or group compatibility?
Yes. The same calculator works for friends, family, and teammates, not only romantic partners, so you can read the chemistry in any relationship.