Websites & landing pages
Marketing sites, campaign landing pages, and multi-page experiences — fast, responsive, and built to convert.
Websites, apps & lead capture
Build digital experiences that turn traffic into leads
A beautiful site means nothing if forms don't fire, tracking is missing, and nobody knows which pages convert. MarStack designs, builds, and maintains websites and web apps — with GA4, GTM, HubSpot, and lead forms wired correctly from day one.
Featured client
Built for brands people already trust
We don't just ship pages — we ship sites that capture leads and prove what's working.
Clark Howard
Millions of readers every month
Website design, development, and lead capture for one of America's most trusted consumer finance brands — newsletter signups, tools, and forms that feed the full marketing stack.
Most websites look fine — and still lose leads
The problem usually isn't design. It's what happens after someone clicks submit.
"Our forms submit — but leads never show up in HubSpot."
Broken field mapping, missing hidden UTMs, and JavaScript errors silently drop conversions before they reach your CRM.
"We launched a new site and lost all our tracking."
GTM containers weren't migrated, GA4 events weren't rebuilt, and now every report starts with "Direct."
"Nobody maintains the site after launch."
Plugins break, pages slow down, forms stop working, and there's no one who owns both the code and the data layer.
What we design, build, and maintain
Full-stack web work from a team that thinks in conversions and attribution — not just pixels.
Web apps & tools
Calculators, configurators, dashboards, and internal tools — custom builds with APIs and data integrations when you need them.
Lead forms & capture
Contact forms, newsletter signups, multi-step flows, and HubSpot embeds — tracked end to end so every lead has a source.
Tracking built in
GA4, GTM, HubSpot, ad pixels, and conversion events configured before launch — not bolted on after the site goes live.
Ongoing maintenance
Updates, performance fixes, form monitoring, and tag health checks — so your site keeps working as your stack evolves.
CMS & platform work
WordPress, HubSpot CMS, Webflow, and custom stacks — we work in your platform or recommend the right one for the job.
From concept to converting — in three steps
Plan & design
We map user flows, conversion goals, and the tracking plan before a single line of code — so design and data stay aligned.
Build & integrate
Development with forms, CRM handoffs, GTM, and GA4 events tested on staging — not discovered broken in production.
Launch & maintain
Go live with confidence, then keep the site fast, secure, and measurable with ongoing support when you need it.
How we scope web projects
Landing page
Fixed scope
campaign-ready in weeks
- Single high-converting page
- Form + HubSpot or CRM handoff
- GA4 & GTM tracking on launch
- Mobile-responsive design
Full website
Project-based
design through launch
- Multi-page site or redesign
- Lead forms & conversion flows
- Full tracking & analytics setup
- CMS training & documentation
Ongoing care
Monthly
maintain & improve
- Updates, fixes & performance
- Form & tag health monitoring
- New pages & A/B test support
- Priority response when something breaks
Websites & apps FAQ
Do you only build sites, or fix existing ones too?
Both. We take on greenfield builds, redesigns, and rescue projects where tracking or forms are broken on a site that otherwise works. Start with a free site audit if you're not sure where things stand.
Will my forms connect to HubSpot / Salesforce / our CRM?
Yes. We wire forms to HubSpot natively and use APIs, Zapier, or custom integrations for other CRMs — with UTM and source data preserved so attribution doesn't break at the handoff.
How is this different from a typical web design agency?
Most agencies hand off tracking to someone else after launch. We're a marketing data agency — GA4, GTM, and lead attribution are part of every build, not an add-on invoice.
What platforms do you work with?
WordPress, HubSpot CMS, Webflow, React/Next.js, and custom stacks. We pick the platform that fits your team and budget — then build it so marketing data actually works.
Ready to build something that converts?
Tell us about your site, your forms, and what's broken — we'll scope a project or start with a free audit.