A creative toolbox featuring shadow, SVG, gradient, and background pattern generators, color. Open-source, fast, and made for builders.
Build and grow your app business The world's best apps use RevenueCat to power purchases, manage customer data, and grow revenue on iOS, Android, and the web.
We spend a lot of time advising startups. Though one-on-one advice will always be crucial, we thought it might help us scale Y Combinator if we could distill the most generalizable parts of this advice into a sort of playbook we could give YC and YC Fellowship companies. Then we thought we should just give it to everyone. This is meant for people new to the world of startups. Most of this will not be new to people who have read a lot of what YC partners have written—the goal is to get it into one place. There may be a part II on how to scale a startup later—this mostly covers how to start one.
Free day number and week number calculator. Calculate what day of the year it is, ISO 8601 week numbers, days between dates, and time zone-based calendars. Embeddable widgets available.
This tool allows users to add invisible watermarks to text generated by AI. It assists in identifying machine-written content to maintain authenticity and track digital assets across platforms.
All Shadcn offers templates, components, blocks & tools to help developers build their projects faster.
iGrowthTracker (Website Growth Tracker) – Instantly explore rising websites and traffic trends. Free users can check any domain’s estimated visits and engagement, while premium unlocks full growth leaderboards, keyword opportunity insights, and bulk analysis—ideal for founders and small teams looking ahead.
Create clear, compliant UK invoices fast. Built for freelancers, small teams, and limited companies.
Transform ideas into UI designs for mobile and web applications.
Create beautiful OG Images, Twitter/X Header Images, Blog Featured Images & more for free, in simple clicks.
