This document provides an overview of 31 different startup business models, including freemium, subscription, marketplace, aggregator, pay-as-you-go, fee-for-service, lock-in, API licensing, open source, data, blockchain, freeterprise, razor blade, direct-to-consumer, private label, franchise, ad-based, octopus, transactional, peer-to-peer, peer-to-peer lending, brokerage, dropshipping, space as a service, third party logistics, last mile delivery, affiliate marketing, virtual goods, cloud kitchens, and crowdsourcing business models. Each model is briefly defined and examples are provided.