Templates aren’t enough anymore
You cobbled something together with no-code or a bought theme. It holds for three weeks, then you hit a business rule the tool can’t handle. Custom starts from your logic, not from a template.
Web & mobile app development Custom web app development
Custom web app development
for web and mobile
We design and develop your custom web and mobile applications — from the client-facing app to the internal business tool, all the way to mobile. In-house design, modern stack, AI when it’s useful. First version live in 14 days. You own it.
2 spots left for July Rated 4.8 out of 5 — 11 verified reviews
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PrestiLeads The stakes
Why your application still doesn’t exist
Traditional agencies: heavy, slow, expensive
A 40-page spec, six months of dev, an invoice that doubles, and an app that’s already dated on delivery day. You wanted a product, you got a construction site.
Design and code disconnected
On one side a mockup, on the other devs interpreting it. With us, design and front-end are handled by the same person: what you see is what gets shipped.
What we do for you
End-to-end web & mobile development
Custom web applications
A client-facing app (portal, member area, dashboard) or a full web product, built on your real business logic, not on a template.
Internal business tools
The apps your teams are waiting for: management, tracking, data entry, reporting. We replace shaky spreadsheets with a real tool built for your process.
Mobile applications
iOS and Android from a single React Native codebase. Native, fast, published on the stores, without doubling the budget.
Product design & polished front-end
Interface conceived and designed in-house by Dorian, then developed identically. An app that looks pro because it is.
AI built in when it’s relevant
Smart search, generation, assistance, automation. We add it where it creates value, not to tick a marketing box.
Scalability & handover
Clean, documented code, architected to grow. You get the codebase and continue with your team or ours.
Our process
From audit to deployment, in a few weeks
Audit & mapping
One week, free, no commitment. We map and quantify. You leave with a clear plan.
Two-week sprints
First system live in 14 days, behind a feature flag, instrumented. We measure, we adjust.
Handover & tuning
You own it: code, runbook, training. Optional retainer. Never stuck with us.
14 days 1st system in production
100% code ownership
SOC 2 Type II security
0 lock-in
Why FlexInAI? An AI agency of operators,
An AI agency of operators,
not consultants
We ship code, not decks
A system in production that your teams use. Not a recommendation.
First system in 14 days
You see value in two weeks and decide on something concrete.
You own everything
Code, runbook, training. You’re 100% autonomous. Optional retainer.
7 operators, one Slack
AI, front-end, full-stack, sales, design. One point of contact, execution speed.
Cross-sector visibility
We reuse what works elsewhere, so you don’t pay the learning curve.
Measurable results
Transparent pricing, free audit. We don’t bill for fuzziness.
Stack & Security
A solid stack, serious security
TLS 1.2+ · AES-256 · SOC 2 Type II · regular pen tests · VPC / on-prem deployment available
Case studies
Our application work
What is custom web and mobile application development?
Designing and coding an application tailored to your need rather than adapting a template. We start from your business logic, design the screens, develop the web and/or mobile app, and put it into production. A product that does exactly what you need.
Do you do web and mobile, or just one of the two?
Both. A web app alone, a mobile app alone, or both in sync. For mobile, React Native: a single codebase serves iOS and Android, which avoids paying for two developments.
How long for a first version?
Your first usable version is live in 14 days, behind a feature flag and instrumented. We then deliver in two-week sprints: you watch the app grow continuously instead of waiting months.
How is this different from your SaaS or showcase-site offer?
This page covers web and mobile applications (client app, business tool, mobile app). The SaaS/MVP offer is about a commercial product sold on subscription. The showcase site & landing offer is about marketing sites. Here, we’re talking about applications you operate.
Do we own the application?
Yes, entirely. You get the code, the design, a runbook and training for your teams. You continue with your team or keep us on retainer. You’re never locked in with a vendor.
Can you take over an existing application?
Yes. We audit an existing app, then modernize or rebuild it on a clean stack (Next.js, React Native, Supabase). We start with the free audit to assess what to keep, what to redo, and the shortest path.
On Zoom 2 spots left for July Rated 4.8 out of 5 — 11 reviews
Ready to launch your custom application?
Book a 20-minute audit call. We scope your web or mobile app, quantify it, and you leave with a clear plan. First version live in 14 days.
Book a call