# App Front > Clear and candid: installable web apps, with every cost and catch up front: what they cost, whether they show ads, whether you need an account, whether they work offline and where your data goes. Every app is an installable web app: it opens from a link in any browser, on phones, tablets and computers, and can be added to the home screen with no app store. Every app wears the same tag in four parts, Cost, Convenience, Privacy and Footprint, checked against the app itself. ## Apps - [CodeQuest](https://appfront.cc/apps/codequest): Learn Python and SQL in your browser, one short quest at a time. Learn Python from scratch, in your browser; Learn SQL and practise writing queries; Learn to code on your phone or tablet. - [Safe and Signed](https://appfront.cc/apps/safe-and-signed): Send a PDF for signature. Clients sign free on any phone. Get a contract or agreement signed online; Send a PDF for e-signature, with no account needed to sign; Let a client sign a document on their phone. ## Data - [apps.json](https://appfront.cc/apps.json): every app with its features, what you can do with it, and the whole tag, as JSON - [llms-full.txt](https://appfront.cc/llms-full.txt): the same, as one Markdown file ## Optional - [How the tags work](https://appfront.cc/labels): every answer each fact can have, and what it means - [For developers](https://appfront.cc/developers): how to list an app