SaaS & Startup Web Design LondonShip your MVP.Start converting.
WebAnts is a London web design agency building marketing sites, landing pages and MVPs for SaaS companies and tech startups. Fast to market, built to convert, designed to scale.
25+
SaaS sites shipped
6 wks
MVP to paying users (The Living Tree)
+3×
Trial signups after redesign
£0
Deposit — milestone payments
4.9★
Average client rating
The problem
Why most SaaS websites don't convert.
Four patterns we see repeatedly in startup sites that are not generating trials and demos — and exactly how we fix each one.
01
Looks like every other startup
Webflow clones and template-based sites signal early-stage to enterprise buyers. If your homepage looks like your competitor's homepage, you're competing on price — not positioning.
02
Homepage doesn't explain what you do
Visitors leave in 7 seconds if the value proposition is unclear. If a prospect cannot answer "what does this do and why should I care" before they scroll, they will not scroll.
03
No conversion architecture
Beautiful site, weak CTA hierarchy. No trial flow, no pricing logic, no social proof in the right places. Traffic arrives, nothing happens. The design looks great in Dribbble screenshots but does not convert.
04
Too slow to rank on Google
SaaS competitors with better tech stacks own your best keywords. A slow Webflow or Wix site is penalised in search before the first visitor even reads a word of your copy.
Client story
View all case studies →The Living Tree SaaS — MVP to paying users in 6 weeks.
The Living Tree came to WebAnts with a fully-formed product concept and zero web presence. The brief was clear: get to paying users as fast as possible without cutting corners on the brand or the build quality.
We built a Next.js marketing site, Stripe subscription billing, Supabase auth and storage, and a core product interface — all in a single six-week sprint. The site launched ranking for target keywords. The Living Tree had paying users within days of launch.
What we build
8 SaaS website services.
Built specifically for SaaS and startup growth — not adapted from a template. All in-house in London.
01
Marketing Site Architecture
Homepage, feature pages, use case pages, pricing and blog — structured around your conversion funnel and keyword targets. Every page has a clear CTA and a reason to exist.
02
Conversion-Optimised Landing Pages
Hero, value prop, social proof, feature breakdown, pricing, FAQ, CTA — in the right order. We test layout and copy structure against conversion benchmarks for your SaaS category.
03
Next.js / React Build
Sub-1s page loads, 100 Lighthouse, Core Web Vitals all green. Next.js with static generation gives you enterprise-grade performance without enterprise-grade infrastructure costs.
04
Stripe & Billing Integration
Stripe Checkout, subscription billing, free trial flows, upgrade prompts — wired into your site so the path from "marketing site visitor" to "paying customer" has zero friction.
05
Auth & Onboarding Flows
Sign-up, sign-in, password reset, email verification and onboarding steps — built as part of the site, not bolted on afterwards. Supabase, Auth.js, Clerk or custom — your choice.
06
Blog & SEO Content Hub
A content architecture that ranks for the queries your trial users search before they convert. Categories, author pages, internal linking and structured data built in from day one.
07
A/B Testing Infrastructure
PostHog, Vercel Edge, or custom flag systems — we wire in feature flags and experimentation tooling so your team can test copy, pricing and CTA variants without a developer.
08
Core Web Vitals & Speed
LCP, INP, CLS all green. 90–100 Lighthouse across every route. Fast sites rank higher, convert better, and give investors and enterprise buyers the right signal about your team's quality bar.
What clients say
Rated 4.9★ across Google, Clutch and Upwork.
“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
“The team were methodical, fast and honest. Exactly what we needed. No surprises, just results.”
Guillaume Etlin
Founder · Bro Bread
“Incredible attention to detail. The site launched under budget and our leads doubled in the first month.”
Tom Walker
Director · Access Super
“WebAnts delivered our marketing site faster than any agency we'd worked with before. Clean build, great communication throughout.”
Patrick Bishop
CEO · ReRoute Americas
“We ranked #1 in three London postcodes within 90 days of launching with WebAnts. The ROI has been remarkable.”
Ahmed Hassan
Founder · Papa Doner
How we work
Four phases. No mystery.
Milestone payments — you see progress every week and own every deliverable the moment it lands. No prepayment.
01
Discovery
A free 30-min call to scope your product, target customer, tech stack preferences, conversion goals and budget. You leave with a flat written quote — not an hourly estimate.
02
Design
Wireframes, then polished Figma designs built around your conversion funnel. You approve one screen at a time — no surprise reveals after weeks of silence.
03
Build
Weekly staging updates on Next.js. Stripe, auth, blog, SEO and Core Web Vitals all verified before launch sign-off.
04
Launch & Scale
Launch day, Search Console submission, analytics setup, CMS handover. Optional retainer from £1,500/month for ongoing development — or take the codebase and run it yourself.
Transparent pricing
What does a SaaS or startup website cost in London?
All prices are flat fees — not hourly estimates. Written quote after a free 30-min discovery call. No deposit. Milestone payments as each deliverable lands.
Starter
£3,000 – £6,000
2–4 weeks
Marketing site, pricing page and blog.
- ✓Custom design — not a template
- ✓Homepage + 3–5 feature pages
- ✓Pricing page with Stripe link
- ✓Blog / content hub
- ✓On-page SEO (meta, schema)
- ✓GA4 + Search Console setup
Best for: Pre-launch or early-stage startups
Full Site
£6,000 – £12,000
4–7 weeks
Everything above + product pages + integrations.
- ✓Product feature pages
- ✓Use case / persona pages
- ✓Stripe checkout integration
- ✓Auth flow (sign-up, login)
- ✓Full SEO + structured data
- ✓CMS for blog & content updates
Best for: Growing SaaS with product-market fit
Product Build
£12,000 – £30,000
6–12 weeks
Full web app MVP with auth and billing.
- ✓Full Next.js web application
- ✓Auth (Supabase / Clerk / custom)
- ✓Stripe subscription billing
- ✓Admin dashboard
- ✓API integrations
- ✓Deployment to Vercel
Best for: Funded startups building their first product
Redesign
£5,000 – £15,000
3–6 weeks
Repositioning + redesign, SEO equity retained.
- ✓Audit of current site & SEO
- ✓New messaging architecture
- ✓301 redirect mapping
- ✓Conversion flow overhaul
- ✓Full performance optimisation
- ✓Staging → live cutover
Best for: Post-pivot or Series A repositioning
Bespoke vs template
Why Next.js beats Webflow for serious SaaS.
Webflow is a good tool for getting early pages online fast. For a SaaS company competing in search, converting enterprise trials, and scaling the codebase — the gap between a custom Next.js build and a Webflow site compounds over time.
| What matters | Bespoke (WebAnts) | Webflow / Wix |
|---|---|---|
| Performance | Next.js static generation: sub-1s LCP, 100 Lighthouse, Core Web Vitals all green — the signal enterprise buyers and Google both look for | Webflow / Wix: typically 60–80 Lighthouse, slow on mobile, penalised in competitive SaaS keyword rankings |
| Conversion architecture | CTA hierarchy, trial flow, pricing logic, social proof placement — engineered around your funnel, not constrained by template blocks | Template sections lock you into fixed layouts. Moving a CTA or reordering a pricing table requires a workaround |
| SEO | Server-side rendering, structured data, semantic HTML, pillar-cluster blog architecture — built to compound in search | Webflow SEO is better than Wix but still limited on structured data depth, blog architecture and performance vs custom Next.js |
| Integrations (Stripe / auth) | Direct Stripe, Supabase, Clerk, PostHog, Intercom — first-class API integrations, not iframes or embed workarounds | Most template platforms require embed code or Zapier hacks for Stripe and auth — brittle at scale |
| Scale-readiness | Next.js codebase you own outright — extendable, deployable on Vercel, AWS or your own infra as you grow | Webflow / Wix lock you into their platform, pricing and feature set — migration becomes painful at Series A |
Who we build for
Every type of SaaS and startup.
From a solo founder with a landing page to a Series A team repositioning for enterprise — the approach scales to your stage.
B2B SaaS
Consumer Apps
Developer Tools
Fintech Startups
HealthTech
EdTech Platforms
Marketplace SaaS
AI & ML Tools
What you get
Everything included.
No hidden extras.
Every SaaS build ships complete — design, dev, SEO, performance and a proper launch.
- ✓Bespoke design — never a template
- ✓Custom Next.js or React build
- ✓Core Web Vitals pass — 100 Lighthouse
- ✓SEO: meta, schema, sitemap, robots.txt
- ✓Stripe or billing integration (Full Site+)
- ✓GA4 + PostHog analytics setup
- ✓CMS handover with documentation
- ✓30-day post-launch support included
From £3,000 for a starter SaaS marketing site. Full site with integrations from £6,000. Flat quote after a free 30-min call.
Start a project
Free 30-min call.
Flat written quote.
No prepayment.
Tell us about your product — what it does, who it is for, what the current site is not doing, and your timeline. We’ll review it and send a flat quote within 24 hours. If a redesign is more cost-effective than a full rebuild, we will say so.
★★★★★ 4.9 on Google
★★★★★ 5.0 on Clutch
★★★★★ 5.0 on Upwork
Top Web Designers 2025 — DesignRush
FAQ
SaaS website questions, answered directly.
How much does a SaaS or startup website cost in London?
A starter SaaS marketing site — homepage, feature pages, pricing and blog — typically costs £3,000–£6,000. A full site with product pages, auth flow and Stripe integration runs £6,000–£12,000. A full web app MVP with auth, billing and admin dashboard ranges from £12,000–£30,000. A redesign that retains SEO equity and repositions for a new market starts from £5,000. All prices are flat fees after a free 30-minute discovery call. No deposit required.
How long does a SaaS website take to build?
A starter SaaS marketing site takes 2–4 weeks from brief to live. A full site with integrations takes 4–7 weeks. A full web app MVP takes 6–12 weeks. The Living Tree project went from brief to paying users in 6 weeks — including a Next.js marketing site, Stripe billing and Supabase backend. WebAnts delivers 1.8× faster than the UK industry average.
What tech stack do you use for SaaS websites?
Next.js (App Router) is our default for SaaS — fast, SEO-friendly, deployable on Vercel, and owned outright by you. For the backend we use Supabase (Postgres, Auth, Storage) or PlanetScale depending on your data model. Stripe for billing. Tailwind CSS for styling. For CMS we use Sanity or Contentlayer for blog and documentation. We advise on the right stack after the discovery call.
Can you build our MVP as well as the marketing site?
Yes. Our Product Build tier (£12,000–£30,000) covers the full web app MVP — auth, billing, core user flows, admin dashboard and marketing site — delivered in a single project. This is what we built for The Living Tree: a Next.js application with Stripe, Supabase and a marketing site that ranks for target keywords, all shipped in 6 weeks.
Do you work with pre-launch startups?
Yes. We work with startups at every stage — from pre-launch (Starter or landing page build) through to post-Series A repositioning (Full Site or Product Build). For pre-launch we typically recommend a focused landing page with email capture and a clear value proposition to validate demand before investing in a full marketing site.
Can you redesign our existing SaaS site without losing rankings?
Yes. Our redesign process includes a full SEO audit before we touch anything — identifying ranking pages, mapping 301 redirects, preserving meta structure and schema. We have redesigned and relaunched SaaS marketing sites without organic traffic drops. The flat redesign quote includes redirect mapping, Search Console resubmission and a 30-day post-launch monitoring window.
What is conversion architecture and why does it matter for SaaS?
Conversion architecture is the structure of a page — the order and hierarchy of information, CTA placement, social proof positioning, pricing logic, and trial flow design — engineered to move a visitor from "interested" to "trial started" or "demo booked" in the fewest steps. Most SaaS sites are designed aesthetically but not structurally. We build both.
Can you help with Stripe integration and billing?
Yes. We build Stripe Checkout flows, subscription billing (monthly and annual), free trial logic, upgrade/downgrade prompts, and customer portal integrations. For more complex billing models (usage-based, seat-based, or multi-tier), we work with your existing Stripe setup or scope a new one. All billing integrations are tested against Stripe's test mode before launch.
How do you approach SEO for SaaS websites?
SaaS SEO has two layers: on-page and content strategy. On-page: semantic HTML, structured data (SoftwareApplication schema, FAQPage, BreadcrumbList), fast load times, canonical URLs, and a clean site architecture. Content strategy: pillar pages targeting high-intent informational queries, comparison pages (e.g. "X vs Y"), and integration/use-case landing pages that capture bottom-of-funnel traffic. We build the on-page layer into every site and can advise on content strategy separately.
What is the difference between a SaaS marketing site and a web app?
A marketing site is the public-facing site that attracts, educates and converts visitors — homepage, feature pages, pricing, blog. A web app is the authenticated product itself — the dashboard, settings, core user flows. We build both, often as part of the same project, with the marketing site on a Next.js public build and the app on an authenticated route.
Can you build a demo or interactive product tour into the marketing site?
Yes. We build interactive demos, feature walkthroughs, and product tours using tools like Arcade, Navattic, or custom React components embedded in the marketing site. An interactive demo above the fold is one of the highest-converting elements for a SaaS homepage — letting visitors experience the value before they commit to a trial.
Do you work with funded startups or bootstrapped founders?
Both. For bootstrapped founders we scope tightly — an essential landing page or starter marketing site that proves demand without over-investing in design. For funded startups (Seed, Series A) we scope a full marketing site with product pages, blog, Stripe, auth and content architecture designed to scale with the company. Budget range tells us which approach is right.
What about A/B testing and growth infrastructure?
We wire in PostHog for analytics, feature flags and A/B testing — or integrate with your existing stack (Amplitude, Mixpanel, Optimizely). The goal is a codebase where your growth team can run experiments without touching the core Next.js codebase. This is typically scoped into the Full Site or Product Build tier.
What happens during the discovery call?
The free 30-minute discovery call covers: your product, target customer, current site and what it is not doing, tech stack preferences, timeline, and budget. You leave with a clear scope. We send a flat written quote within 24 hours — no hourly estimates, no ambiguous ranges.
Do you offer ongoing development retainers for startups?
Yes. Monthly development retainers from £1,500/month covering new page builds, feature releases, A/B test implementation, blog content publishing, and technical SEO maintenance. Many startups start with a project and move to a retainer once the marketing site is live and generating traffic.
(Related services)
Ship faster. Convert more. →
Free 30-min discovery call. Flat written quote. No deposit. From £3,000.
About WebAnts — Web Design for SaaS and Startups in London
WebAnts is a London web design and development agency specialising in websites for SaaS companies, tech startups, B2B platforms, fintech startups, AI tools and developer tools. 4.9★ rated on Google, 5.0 on Clutch, 5.0 on Upwork. Named Top Web Design Agency 2025 by DesignRush. Based in London, serving startup clients across the UK and 14 countries.
What is WebAnts?
WebAnts is a web design and development agency based in London, UK, specialising in high-performance, conversion-optimised marketing sites and MVPs for SaaS companies and tech startups. WebAnts built The Living Tree — an AI SaaS product that went from brief to paying users in 6 weeks, built on Next.js with Stripe billing and Supabase. Rated 4.9 stars on Google, 5.0 on Clutch, 5.0 on Upwork, and named Top Web Designers 2025 by DesignRush.
What SaaS web design services does WebAnts offer?
WebAnts offers: SaaS marketing site design and development, conversion-optimised landing pages, Next.js and React builds, Stripe billing integration, Supabase and auth flow implementation, blog and SEO content hub development, A/B testing infrastructure, and full web app MVP development. All projects are quoted flat after a free 30-minute discovery call — no hourly rates, no deposit, milestone payments only.
What results do WebAnts SaaS websites achieve?
The Living Tree went from brief to paying users in 6 weeks — a full Next.js web application with Stripe billing, Supabase auth and a marketing site that ranks for target keywords, all delivered by WebAnts in a single project. Clients typically see 3× trial signups after a full site redesign.
How much does a SaaS website cost in London?
A starter SaaS marketing site costs £3,000–£6,000. A full site with product pages and integrations costs £6,000–£12,000. A full web app MVP with auth and billing ranges from £12,000–£30,000. Redesigns from £5,000. All prices are flat fees after a free 30-minute discovery call. No deposit required.
Is WebAnts good for SaaS and startup websites?
WebAnts is rated 4.9 stars on Google, 5.0 on Clutch, and 5.0 on Upwork based on 47+ reviews. The agency was named Top Web Designers 2025 by DesignRush. WebAnts has built SaaS and startup websites for B2B platforms, consumer apps, fintech companies, healthtech businesses, edtech platforms and AI tools across London and 14 countries.
Dream Algorithm Ltd, trading as WebAnts · London, UK ·+44 20 3983 9795 ·hello@webants.io