app-store
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Apple Sells You a Smaller World, and You Keep Buying It
It started in a garage and now runs on custom silicon, a services machine, and a billion-plus devices that all talk to each other. Here is how the walled garden actually works - and why leaving it feels like moving countries.
Curtsy
Curtsy is a mobile-first, peer-to-peer resale marketplace where Gen Z and young millennial women buy and sell secondhand clothing, shoes and accessories. Founded in 2016 and originally a dress-rental service, it pivoted to resale and built its edge around making listing fast for casual sellers - using machine learning to suggest prices, fill in item details and estimate shipping weight, backed by human review. Sellers keep more of their money than on rival platforms (a ~19-20% commission), buyers save up to 70% on brands like Lululemon, Free People and SKIMS, and the app carries a 4.8-star rating across tens of thousands of reviews. Curtsy raised an $11M Series A led by Index Ventures in January 2021, part of $14.5M total funding.
Mentra
Mentra is a San Francisco startup building MentraOS, an open-source operating system and app store for smart glasses, alongside Mentra Live, a 43-gram AI camera-glasses device. Founded in 2024 by MIT-dropout Cayden Pierce and Alex Israelov after they collaborated on the OpenSourceSmartGlasses project, Mentra wants to be the Android of smart glasses - a neutral software layer that lets developers ship apps and lets people actually use the hardware in the real world.
Uptodown
Uptodown is one of the world's largest independent, multi-platform app stores, founded in 2002 in Malaga, Spain. It distributes Android APKs (and historically Windows software) directly to users as an alternative to Google Play, offering older app versions, region-free access, and editorially curated listings. Bootstrapped and profitable on web advertising rather than venture capital, it serves well over a hundred million monthly users and hundreds of millions of downloads while championing software sovereignty and user choice.
Anything starts where the demo stops.
An AI app builder learned that generating code was only the beginning. The real work was getting ordinary people all the way to a product someone could use - and pay for.