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MBTI Friendship Compatibility

ISTJ

the one who actually brings the charger

ISTJ friendship compatibility: best friends with ISTP. As a friend, ISTJ is the one who actually brings the charger, the band-aid and the printed tickets. The stereotype says ISTJs are steady, reliable and dry-humored, the friend who shows up on time every time and keeps the same group of friends for decades. They are not always the loudest at the party, but they are the one you call when the car breaks down. In our friendship rule ISTJ scores highest with ISTP, who shares the S, I and T and adds a relaxed, hands-on streak to an ISTJ's careful plans. Same-type ISTJ friendships score high too, with very punctual dinners. The hardest friendship on paper is with ENFJ, the hype person, whose big emotions and big plans can feel like a lot before coffee.

Best friend type
ISTP
96% · the one who quietly fixes it
Hardest match
ENFJ
64% · the hype person

Top 3 friends for ISTJ

The hardest friendship for ISTJ

All 16 types as ISTJ's friend

Friend scores follow one rule we designed ourselves: base 46; S/N same +18 or different +2; E/I same +14 or +6; J/P different +10 or same +6; T/F same +8 or +4. Not an official MBTI product.

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Frequently asked questions

Who is ISTJ's best friend type?

In our friendship rule ISTJ scores highest with ISTP (96%), the type that shares three letters and differs only in J/P. Next come ISFP (92%), ISFJ (88%). The rule is our own design and not a science, so treat it as a conversation starter.

Which type is the hardest friend for ISTJ?

The lowest friend score for ISTJ goes to ENFJ (64%): different E/I, S/N and T/F but the same J/P. It means more negotiating, not a ban — plenty of opposites stay friends for life.

Is ISTJ's best friend the same as its best love match?

Not here. In our love-match rule ISTJ's top match is ISFJ (99%), while its top friend is ISTP (96%), because the love rule rewards opposite E/I and T/F and the friendship rule rewards sharing them.