Say what it is for
“A site for my barbershop” is enough to start. So is a two-page spec an assistant wrote for you: paste it as it is, up to 20,000 characters, lists and line breaks kept.
Describe it. Get a website or app.
Built by an AI agent. Hosted free.
Or email casso@casso-websites.com.
Websites and web apps
Sign-in and a database
Admin panel included
Edits by email
Free hosting
How it works
One message in. A live site out.
Live on the web, not a mock-up
The agent writes the pages, wires up any forms, sign-in and storage the idea needs, checks its own pages before it answers, and publishes to a free .bycasso.com address.
Reply to change anything
“Open at 8am on Saturdays.” “Add a page for catering.” Reply to the email, or use the console. The live site is updated, and earlier versions are kept so a change can be undone.
Not just pages
It builds the working version.
Most AI site builders hand you a brochure. Ask Casso for an order form, a members’ area or a staff tool and you get one that saves real data, on the free plan.
People sign up and sign in
Real accounts, checked on our server. Each member sees their own data and you see everyone’s. You choose who may join: anyone, people you approve, or invite only.
Forms that keep what visitors send
Bookings, orders, applications, a waiting list. Anyone can submit, only you can read them, and each one is emailed to you as well.
Shared boards
Members post and the group reads: a noticeboard, listings, a team roster. Only the author, or you, can change a post.
A contact form that emails you
With the sender’s reply address on it. Visitors can attach a photo or a PDF; it arrives with the message.
Send entries where you work
Discord, Slack, Google Sheets, Zapier, Make, Airtable, and Calendly embeds. A key you give us is encrypted, and it is never written into the page.
Search engines are told
Every page is pre-rendered so search engines and AI assistants can read it, with a sitemap, and each change is submitted to Bing and others through IndexNow. That is a request to crawl, not a promise to rank.
The console
An admin panel you did not have to ask for.
Sign in with a link sent to your email — no password. See your visitors, every message your forms sent, your site’s health and your domain. Your data appears as tables with edit forms and the buttons your business needs, and the text you change often (a menu, prices, opening hours) as a form you fill in.
You never have to use it. Email alone is a complete way to run your site.
Honest limits
What it cannot do.
Better to know before you start. If you ask for one of these it will say so rather than build something that only looks like it works.
Card payments
A Casso site cannot charge a card. It can link to your own Stripe, Square or PayPal page.
Storing visitors’ files
A photo or PDF sent through a form is emailed to you, not kept on the site.
Native apps
No App Store or Google Play apps. Everything is a web app that works in a phone’s browser.
Large apps
The free plan is for trying it with a small group: 20 members, 250 stored entries and about 100 visitor requests a day per site. The one-time $19 App Plan raises that to 5,000 members, 32,000 entries and 10,000 requests a day (the $99 site upgrade does too, and connects your domain).
Free
The site or app, hosting on a .bycasso.com address for as long as you want it, HTTPS and the console. No card. Free credits cover the first build and a good number of changes; $10 buys more.
$19 once, per app
The App Plan: raises one site's backend limits 100× and adds 10,000 credits. No domain. Nothing renews.
$99 once, per site
Puts the site on a domain you own, raises its backend limits and adds 10,000 credits. Nothing renews. It does not unlock any feature.
Questions
Can I just email a description of my business and get a website back?
Yes. Send it to casso@casso-websites.com. There is no account to create and no form to fill in; the reply has your live link, usually within a couple of minutes. Reply to that email whenever you want something changed.
Can it build an app with logins and a database, not just a website?
Yes, for apps the size of a small business, team or club: members sign in with an email and password, their data is stored on the site’s own backend, and you manage it from the console. More on apps.
Can I paste a spec that ChatGPT wrote for me?
Yes. Paste the whole thing, up to 20,000 characters. The agent builds from all of it, and tells you plainly if part of it is something it cannot do.
Does it work in languages other than English?
Yes. Write in your language and the agent replies in it and builds the site in it, including right-to-left languages such as Persian.
Is it really free?
The site and its hosting are free, with no card. More editing credits are $10 if you use up the free ones. Two upgrades, each paid once per site: the $19 App Plan raises the backend limits and adds 10,000 credits; the $99 site upgrade does the same and connects a domain you own.
Who is behind it?
Casso is a small company operated from Connecticut, United States, by Jon York. The building agent runs on OpenAI and Anthropic models.
Watch
Building a site by email
An earlier video of the email route: one message in, a live website back.
Start here
Tell it what you need.
A sentence is enough. Nothing to install and no card.