Build a SaaS people pay for.
Describe your product. builder77 builds the app, user accounts and data rules, and takes subscriptions through your own Stripe account. Subscriber-only data is checked on the server on every request, so only paying users get in.
Accounts, payments, data rules — already wired
No auth provider to configure, no billing code to write, no backend to host. The parts every subscription product needs come with the app.
User accounts
Sign-up, sign-in, email verification and password reset by email, with single-use links that sign out old sessions. Make any user an app admin.
Stripe subscriptions
Recurring plans and one-time Checkout through your own Stripe account, with no platform fee. Customers cancel or change their card in the Stripe billing portal.
AI features
Chat, generators, summaries and structured output inside your product.
File uploads
Avatars, documents and attachments, stored and linked to your records.
Transactional email
Welcome messages, receipts, reminders and notifications to your users.
Webhooks
Send your app's data to Zapier, Make or n8n webhooks and connect the rest of your stack.
Third-party APIs, from the server
Call any third-party API from the server, with your secret keys kept out of the browser.
A paywall the server enforces
Hiding a button is not a paywall. Mark a collection as members or members-private and the server checks the user's Stripe subscription on every request.
- A lapsed or unpaid subscription loses access
- Users without an active subscription get a
subscription_requirederror - Prices are read on the server, never trusted from the browser
- Customers cancel or change their card in the Stripe billing portal
- Your own Stripe account, no platform fee (Starter plan or above)
{
"rules": {
"plans": "readonly",
"lessons": "members",
"notes": "members-private"
}
}// the price is read from the 'plans' record on the server
await b77.payments.subscribe({
items: [{ collection: 'plans', id: plan.id }]
});
try {
const lessons = await b77.db.list('lessons', { limit: 20 });
render(lessons);
} catch (e) {
if (e.code === 'subscription_required') showPlans();
}
// cancel, change card, invoices
b77.payments.manage();Who can see what, decided on the server
Every collection gets a rule. builder77 picks a safe default from its name, and you can change it in the Data tab or in b77.config.json.
privateEach user sees and edits only their own records. The server refuses everyone else, even through the raw API.
authShared data for everyone who is signed in, like a team board or a community feed.
readonlyCatalogs, plans and content that anyone can read and only you change.
submitOrders, bookings and forms: anyone can send, only you and app admins can read.
membersShared data that only users with an active subscription can open.
members-privateEach subscriber's own records, behind their active subscription.
App admins bypass the rules, so they can manage every record.
SaaS products and tools people sign up for
If you can describe who it's for and what each plan unlocks, builder77 can build the first version.
CRMs
Contacts, deals by stage, notes and a dashboard, behind a sign-in.
Client portals
Each client signs in and sees only their own files, invoices and requests.
Booking systems
Services, time slots, email confirmations and payment at checkout.
Membership sites
Courses, guides or community content that only active subscribers can open.
Internal tools & dashboards
Approvals, inventory and KPIs, with app admins and signed-in-only data.
Subscription products
Niche tools with monthly plans, AI features and a billing portal for your customers.
Your product, your data, your code
Version history
Every change is a version. Restore any of them in one click.
Data browser
Browse and edit every record, and see your users, in the Data tab.
Full JSON export
All collections, users and file links in one download, on every plan.
Source code ZIP
Download the whole project from the Starter plan.
Flutter export
Download a native Flutter project from Starter. See Mobile & Flutter.
Start with a working app
Open a demo with live data and logins, then ask builder77 to add plans and subscriber-only data.
AI writing studio for blog intros, product descriptions, social posts and emails — with history and favorites.
Small-business finance hub: create and print invoices, track expenses and watch revenue vs. spend.
Boutique storefront with search, filters, product drawer, cart, checkout and a built-in orders admin.
Lightweight sales CRM with KPI dashboard, contacts, activity timeline and a drag-and-drop deals pipeline.
Elegant salon site with live availability: pick a service, stylist and time slot, plus a front-desk dashboard.
Kanban project board with drag-and-drop cards, priorities, labels, due dates and private boards per user.
SaaS builder questions
Plans and current prices are on the pricing page. Building a tool without payments? See the AI app builder.
Your SaaS is one description away
Build and publish for free. Turn on subscriptions when you're ready to charge.