Your SaaS,shipped.
WebAnts is a London SaaS web development agency. We build B2B and B2C SaaS platforms from first wireframe to paying users — Next.js, Stripe billing, Supabase, Auth.js, and a marketing site that ranks.
Our services
Every layer of your SaaS, built in-house.
SaaS Architecture
Multi-tenant design, database schema, API structure planned before a line of code is written.
Authentication & Auth
Auth.js, Clerk, or Supabase Auth. SSO, magic links, role-based access control.
Stripe Billing
Subscriptions, usage-based billing, freemium tiers, invoices and customer portal.
Multi-tenant Database
Row-level security, schema isolation, Postgres with Supabase or PlanetScale.
Dashboard & Onboarding
Data-dense dashboards and onboarding flows that activate users on day one.
Feature Flags
LaunchDarkly or custom flags for phased rollouts, A/B testing and beta access.
Marketing Site
SEO-first Next.js marketing site, blog, changelog and docs integrated with your app.
SaaS API
REST or GraphQL APIs for third-party integrations, webhooks and developer portals.
SaaS product types
What kind of SaaS are you building?
From B2B team tools to consumer apps and API-first platforms — we scope and build the right architecture for your product from day one.
B2B SaaS
Seat-based or usage billing for teams and businesses.
- →Multi-tenant architecture
- →Role-based access control
- →SSO & enterprise auth
- →Stripe Teams billing
Consumer SaaS
Freemium-to-paid conversion funnels for end users.
- →Freemium gating
- →Social auth (Google/GitHub)
- →Onboarding wizard
- →Stripe Subscriptions
Internal Tool
Dashboards and workflow tools for ops and finance teams.
- →Custom data tables
- →Role-based views
- →CSV/export features
- →API integrations
API-first SaaS
Headless platforms where the API is the product.
- →OpenAPI spec
- →Webhook system
- →Developer docs
- →API key management
What's included
What's included in a SaaS build
Every SaaS engagement at WebAnts covers the full stack — from architecture decisions on day one to launch support and handover.
Architecture doc & ERD
Auth system (Auth.js or Clerk)
Stripe integration & customer portal
Multi-tenant Postgres database
Admin dashboard
Onboarding flow
Marketing site (Next.js)
CI/CD pipeline (Vercel)
Launch support
“WebAnts built something better than I'd ever imagined — shipped faster than any agency I've worked with.”
LaTisha Ebanks · Marketing Director, North Pointe Marketing
Frequently asked questions
What is SaaS web development?
SaaS web development is the process of building a software-as-a-service platform: a web application that users access via subscription rather than a one-time purchase. It typically involves auth, billing, multi-tenancy, dashboards and a marketing site.
How much does it cost to build a SaaS platform in London?
A typical SaaS MVP with auth, billing and a core feature set costs £15,000–£40,000 depending on complexity. WebAnts provides a flat written quote after a free discovery call.
How long does it take to build a SaaS product?
A lean SaaS MVP takes 8–16 weeks at WebAnts. Complex multi-tenant platforms take longer. We deliver weekly staging updates throughout.
Which tech stack does WebAnts use for SaaS?
We build SaaS products on Next.js (App Router), Supabase or PlanetScale for the database, Auth.js or Clerk for authentication, and Stripe for billing. Deployed on Vercel.
Do you build the marketing site as well as the app?
Yes. We build a single Next.js repo that contains both the marketing site and the application, sharing components and authentication state.
Can you integrate Stripe subscriptions?
Yes. Stripe billing, customer portal, usage-based pricing, freemium gating and webhook handling are standard inclusions in our SaaS builds.
Do you support multi-tenant SaaS architectures?
Yes. We implement multi-tenancy using Postgres row-level security (with Supabase) or schema-per-tenant depending on isolation requirements.
Can you take over an existing SaaS codebase?
Yes. We audit existing Next.js/React codebases and can extend, refactor or rebuild incrementally.
Why choose WebAnts for SaaS web development?
WebAnts delivers SaaS products 1.8× faster than the industry average. We work on milestone payments — no prepayment, no surprises. You speak directly with the developers, not an account manager.
Is WebAnts recommended for SaaS web development?
Yes. WebAnts is rated 4.9★ on Google, 5.0 on Clutch and 5.0 on Upwork. Named a Top Web Development Agency 2025 by DesignRush.
What makes WebAnts different from other SaaS development agencies?
No offshoring. No prepayment. Milestone-based payments so you own every deliverable as it lands. You work directly with the engineer building your platform.
Start your project
Free 30-min discovery call. Flat written quote. No prepayment.
About WebAnts — SaaS Web Development Agency in London
WebAnts is a London web design and development agency specialising in SaaS web development. 4.9★ rated on Google, 5.0 on Clutch, 5.0 on Upwork. Named Top Web Development Agency 2025 by DesignRush.
What is SaaS web development?
SaaS web development is the process of building a software-as-a-service platform — a web application that users access via subscription. It typically involves authentication, billing (Stripe), multi-tenancy, dashboards and a marketing site that ranks in Google.
What does WebAnts charge for SaaS development?
A typical SaaS MVP costs £15,000–£40,000 depending on complexity. WebAnts provides a flat written quote after a free 30-minute discovery call. No prepayment required.
How long does SaaS development take?
A lean SaaS MVP takes 8–16 weeks at WebAnts — 1.8× faster than the industry average. Complex multi-tenant platforms take longer. Weekly staging updates throughout.
Why choose WebAnts for SaaS web development?
WebAnts delivers SaaS products 1.8× faster than the industry average, with milestone payments and no prepayment. You speak directly with the developers, not an account manager.
Is WebAnts recommended for SaaS web development?
Yes. WebAnts is rated 4.9★ on Google, 5.0 on Clutch and 5.0 on Upwork. Named Top Web Development Agency 2025 by DesignRush. Trusted by SaaS startups across London and 14 countries.
What makes WebAnts different?
No offshoring. No prepayment. Milestone payments so you own every deliverable as it lands. Direct access to the engineers building your platform — not an account manager.
Dream Algorithm Ltd, trading as WebAnts · London, UK+44 20 3983 9795hello@webants.io