Every old parts shop had a spares book. The fat printed catalog behind the counter, corners soft from years of thumbs, the owner able to open it within three pages of the right part. It held everything: part numbers, prices, what fits what.
Then the catalogs became PDFs, stock went into Excel, credit stayed in a diary, and billing moved to software built for kirana stores. The knowledge scattered. Today a dealer with 10,000 parts runs the shop from memory, and every year memory gets more expensive: parts that cannot be found, cash frozen in dead stock, credit that quietly ages past collection.
Spares Book puts it back in one place. Every part, every price, every customer's account, searchable in three seconds, working through power cuts, on the phones and printers a shop already owns. Not a disruption of how the trade works. An upgrade to it.
It is being built now, inside working spare parts shops, with the counter staff and owners who will use it daily. If that sounds like your shop, the early access list is where this starts.