eCift (Parship rebranded for the Turkish market)
PembePanjur's Personality test is only the IPSATIVE and OBSOLETE Myers-Briggs Type Indicator (MBTI).
It is quite similar to PerfertMatch
ThomasKnowsPleople is an adapted ipsative DISC personality model.
PerfectMatch is an adapted ipsative MBTI personality model.
Chemistry is a proprietary ipsative Explorer, Builder, Negotiator, Director personality model.
Itelligent Elite uses the 16PT ipsative test (not the normative 16PF5)
FaceReader from Profiler1 uses an ipsative test.
DoskonalaPara uses a proprietary ipsative test quite similar to Chemistry's
Energy Profiling also uses a proprietary ipsative test.
eHarmony, eCift/Parship, Be2, MeeticAffinity/DatingDirectAffinity/MatchAffinity, TeAmo use the normative Big5 personality model.
Worldwide, no one dating site uses the 16PF5 normative personality test.
Ipsative tests are based on forced choice questions and responses. Each choice is scored. These scores can only represent the relative strengths of the person being tested and cannot be compared to any other individuals. Such tests can typically be identified in the marketplace by the test asking the person to 'describe themselves'. This type of test would not normally be used in recruitment and selection.
Normative tests measure quantifiable characteristics on individual scales. These scales can vary independently. Also the scores can measure the characteristics of an individual against confirmed patters of normality (e.g. normal distribution or Gaussian distribution). Normative testing allows people to be compared to particular groups, populations, or jobs.
Normative testing generally has a higher validity than ipsative.
"You can have one Myers-Briggs personality on Tuesday and another when you retake the test on Thursday" Barbara Ehrenreich (2006)