The practical alliance
While ISTJ hunts for the manual, ISTP has already fixed it. Both say "called it."
They'll see this match write-up. Your test answers stay with you.
These two
ISTJ × ISTPBoth practical and more trusting of actions than words, you communicate cleanly — just the essentials, and somehow you still understand each other. The difference is ISTJ sticks to the plan and ISTP plays it by ear. ISTJ books the weekend in advance, and ISTP might say "not today, next time" that morning, which puts ISTJ's patience to the test.
To make it lastISTP, change plans by the day before. ISTJ, let a one-day shift slide.
Each on their own
You won't write poems, but you'll never forget an anniversary. You're slow to commit and very hard to shake once you do. A partner who never plans anything will test your patience.
The Quiet FixerYou show love by doing — fixing things, picking up what's needed — but rarely say it first. You last longest with someone who respects your alone time.