A borrow-lend tracker is a lightweight log of things you've lent out (books, tools, money, equipment) and things you've borrowed — with optional reminders so a 'just for the weekend' loan doesn't quietly become a permanent transfer. It's the digital answer to the friend who keeps mentally tallying who owes whom and getting it wrong.

When this matters

• Books and media. The classic forever-lost category. Track who has your copy of Crime and Punishment; cheerfully reclaim it 6 months later.
• Tools. Power tools, ladders, drills — expensive enough to actually want back, easy enough to forget who has them.
• Money between friends. Small loans where neither person wants a Venmo paper trail but both want it remembered.
• Camping / sports gear. Tents, kayaks, gym equipment — high-value, low-frequency items easy to lose track of.
• Office equipment. Anyone managing shared lab / workshop / studio inventory.

The reminder pattern that works

The trick to making lending sustainable is a low-friction reminder, not a confrontation. Set the expected-return date when you lend (a week, a month, whatever feels right). A day before, the tracker pings you — not the borrower. You decide whether it's worth a casual 'hey, did you finish that book?' or whether you've stopped caring. Borrowers tend to remember when politely prompted; the awkwardness is almost always in bringing it up, not in being asked.

Privacy and storage

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