QuoteShield AI
AI quote analysis
Upload a service quote and get a line-by-line fairness check. Accounts, subscriptions and AI analysis in one Next.js app.
Next.jsSupabaseStripeClaude API
SaaS Development
SaaS development, from waitlist to billing
We build subscription software for founders and for businesses turning an internal tool into a product: the app, accounts and billing, the admin side, and the marketing site that brings people in. We know the path because we are walking it with our own products.
SaaS development is building software that many customers sign up for and pay for on a subscription. The app is only part of it: accounts, billing, data kept separate per customer, an admin side and a marketing site all have to work before the first customer pays.
What a SaaS build includes
- The core product: the one loop a customer pays for, such as quote in and analysis out, or a call answered and an appointment booked.
- Accounts and onboarding: sign-up, sign-in, password resets, team invites and a first-run setup that gets a new customer to value quickly.
- Billing: Stripe subscriptions, trials, upgrades, failed-payment handling and a self-serve billing portal.
- Separate data per customer: every record tied to its account, enforced on every request, with tests that try to cross the line.
- An admin side: find a customer, see what happened, fix a record, issue a credit.
- Email, texts and alerts: receipts, notifications and an alert to you when something important happens.
- The marketing site: landing pages, pricing, a waitlist or trial, a blog, and the search basics from day one.
Proof
Our own SaaS, with honest statuses
We build products for ourselves, not just for clients. None of these statuses is rounded up.
BizLifeOS
Business life OS
Web app in early access with an iPhone app built on the same accounts and data. Not in the App Store yet.
SupabaseReact NativeExpoStripe
Greetro
AI voice receptionist
Waitlist site live; the working app is deployed and in private testing, answering our own business line.
Node.jsExpressSQLiteTwilioFly.io
RenoBeam
AI renovation estimator
Photos or video in, line-item estimate and PDF proposal out. Working app built and packaged for hosting; not launched yet.
Node.jsExpressSQLiteDocker
RentShepherd
AI property manager
For landlords with a handful of units: tenant messages triaged, repairs routed and renewals prepared for one-tap approval. Working app built; not launched yet.
Node.jsExpressSQLite
ReelEstate
Listing video for agents
Done-for-you listing reels, ordered and paid online through Stripe, while the self-serve version is designed. Selling the service first is how we test the product.
Netlify FunctionsStripe Checkoutffmpeg
How We Launch
How we take a SaaS idea to launch
Waitlist and search-ready site
A product site with a clear offer, a waitlist and pages written for the searches buyers make. Greetro, RenoBeam and RentShepherd each launched this way, with location pages, a blog and an llms.txt file for AI search.
The core loop, with demo data
The one thing a customer would pay for, working end to end with realistic demo accounts, so you can show it, test it and sell it.
Accounts, billing and onboarding
Stripe subscriptions, the billing portal, invites and a setup flow. The product is now something a stranger can sign up for and pay for without you.
Launch and learn
Real users, error alerts, usage numbers and a short list of what to build next, driven by what customers actually do.
Security basics we don't skip
- Passwords hashed with bcrypt or handled by a proven auth provider, never stored in plain text.
- Every route checks the user, and unauthenticated requests get refused, not quietly served.
- Queries are parameterized and output is escaped, closing off the classic injection and script attacks.
- Account isolation is tested by logging in as one customer and trying every record id that belongs to another.
- Uploads are checked by their content, not just their file name. Testing on Greetro caught a script disguised as an image, and the content check now blocks it.
- Public forms get rate limits and every secret lives in the host's secret settings, never in the code.
Service first, software second
Not every product has to start as software. ReelEstate sells done-for-you listing reels with online checkout while the self-serve version is designed, so real orders shape the product before the build. If your idea can be sold as a service first, we'll help you set that up and build the software around what customers actually buy.
Turning your internal tool into a product
Some of the best SaaS ideas start as a tool a business built for itself. LandIntel began as a one-off land search for a family property sale and became a done-for-you service. If your team already runs on something homemade that others in your industry would pay for, we can help you separate the customer data, add billing and put it in front of buyers.
How Pricing Works
A set build price, then a monthly plan
Every project gets a set price for the initial build, then a monthly plan for only the services you need, priced to compete with the big names. Request a free quote and you'll know the full scope and price before work starts.
The buildQuoted up front from a written scope: the screens, automations, integrations and data moves we agreed on, and what is out of scope.
The monthly planOnly the services you use, such as hosting, monitoring, backups, updates and the changes you ask for. Add or drop services as the business changes.
FAQ
Straight answers
Can you build an MVP first?
Yes, and we recommend it. We usually start with a waitlist site to test demand, then build the one loop a customer pays for, with demo data, before adding the second and third features. That is the order we use for our own products.
How do subscriptions and billing work?
We use Stripe: checkout, subscriptions, trials and a customer billing portal where people update cards and cancel without emailing you. Stripe's webhooks keep each account's access in step with its payment status.
Where will the software be hosted?
It depends on the product. Static marketing sites and serverless functions run well on Netlify; Postgres, sign-in and file storage on Supabase; and always-on services like a phone line on a small Fly.io machine. We pick what keeps the monthly running cost sensible for your stage.
Can it be white-label or multi-tenant?
Yes. Each customer account gets its own data, users and branding, isolated in the database. We test that isolation directly by trying to reach one account's records from another.
How much does SaaS development cost?
Every project gets a set price for the initial build, then a monthly plan for only the services you need, priced to compete with the big names. Request a free quote and you'll know the full scope and price before work starts.
For a new product, the first quote usually covers the waitlist site and the core loop, so you can decide on the next phase with real interest in hand.
Do you build the marketing site and SEO too?
Yes. Greetro, RenoBeam and RentShepherd each launched with location pages, a blog, structured data, an llms.txt file for AI search and IndexNow pings, so search engines and AI assistants could find them from day one.
Related
Keep reading
Have a SaaS idea, or a tool others would pay for?
Tell us who it's for and the one job it does. We'll suggest the leanest launch path, then send a written scope with a set build price and the monthly plan.
Prefer email? admin@stylemarking.com