David Karp’s Favorite Tech Tools

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Pilot Precise V7 Pen

"I always write with a Pilot Precise V7 pen. It’s inky but doesn’t smudge. In addition to to-do lists, I also use the notebooks to sketch out ideas for new features on Tumblr. The notebooks are big, so it takes me between four to six months to fill one up. I keep all of the old ones in a drawer."
COST: $2.48 per pen