The compatibility category collects playful ways to check the chemistry between two people: name compatibility using the traditional Korean stroke-counting game, blood type personality and matching, and star sign compatibility based on element affinity.
Results are entertainment references only — they never judge a real relationship. Enjoy them casually with partners, friends, and colleagues as a conversation starter. To learn how compatibility culture evolved, the guides below cover everything from traditional Korean matchmaking to today's playful matching games.
Three compatibility tests, three different sources for the number
All three show you a score, but the numbers arrive by completely different routes. That is also why averaging them together would mean nothing.
| Test | Where the score comes from | What you enter | Score range | Reach for it when |
|---|---|---|---|---|
| Name Compatibility | Korean names are split into letters, given traditional stroke counts, interleaved, then reduced by adding neighbouring digits | Two Korean names | 0–99 | You are somewhere casual and names are all you have |
| Blood Type Match | The four popular personality types, plus a fixed hash value for each pairing | Two blood types | 60–95 | You want to open a conversation about personalities |
| Sign Compatibility | A table of affinities between the four elements of the zodiac | Two birthdays, or two signs | 55–94 | You want the reasoning behind the number as well |
Name compatibility is the only one of the three whose arithmetic you can watch. Each syllable is broken into consonants and vowels, each of those gets a traditional stroke count, the two names are interleaved one character at a time, and neighbouring numbers are added with only the last digit kept — repeated until two digits remain. The pyramid shrinking on screen is the calculation itself. Star sign compatibility starts from a table instead: the same element scores 80–94, mutually supportive pairings (fire with air, earth with water) score 70–84, and everything else lands between 55 and 69. Blood type chemistry, by contrast, is a hash of the pairing mapped onto the 60–95 range. It is not derived from any statistics, and we say so rather than hiding it.
The idea that blood type determines personality is a Korean and Japanese pop-culture phenomenon with no confirmed scientific support. The four profiles here collect the images that circulate widely rather than any research finding, and the tool's own page and FAQ say exactly that. So if the three tests disagree with each other, nothing has gone wrong — they were never the same game. Name compatibility only works with Korean names, and star sign compatibility sorts the pair before scoring, so swapping the two people gives the same result. None of it judges an actual relationship; treat it as something to talk about.
Read the Related Guides
Gunghap: The Complete Guide to Korean Compatibility Readings
Traditional Korean compatibility and a worked name-score example: follow every reduction, swap the names, and see why a game score is not a probability.
Blood Type Personality Theory — Origins, Myths, and How to Enjoy It
Why do Koreans and Japanese read personality from blood types? Trace the theory from a 1927 Japanese paper to Korea's "Type B boyfriend" craze, see the popular stereotypes, what science actually found, and how to keep it fun.