Custom web app development
Custom web apps and software, built right and shipped fast.
From MVP to business-critical platform, we design, build and launch web applications and custom software your customers and team actually enjoy using, with one point of contact from first call to launch.
- Senior developers matched to your project and industry
- Clear scope and estimate after a free discovery call
- Weekly demos: real progress, not status reports
- AI features built in where they create real value
48h
from discovery call to project kickoff
1–2 wks
to a working AI prototype
30+
proprietary AI engineering accelerators
PhD
AI researchers & certified cloud engineers
The challenge
Sound familiar?
- Your last developer disappeared halfway through the project
- Agencies quoted six figures and six months just for an MVP
- Your team is stuck running the business on spreadsheets
- Your current app is slow, outdated or impossible to change
There's a faster, lower-risk way. Here's how we deliver it.
What you get
What we build
Modern, secure and scalable software, designed around your users and your business goals.
MVPs & SaaS products
Validate your idea fast with a production-ready first version for real users and investors.
Portals & dashboards
Customer portals, internal tools and admin dashboards that replace manual work.
APIs & integrations
Connect your CRM, ERP, payment providers and third-party services into one workflow.
App modernization
Rebuild slow or legacy applications on a modern, secure and scalable architecture.
Mobile-ready experiences
Responsive web apps that feel great on every phone, tablet and desktop.
AI-powered features
Add assistants, smart search, document processing and automation to your product.
Modern, proven technology
- React
- Next.js
- Node.js
- Python
- TypeScript
- PostgreSQL
- REST & GraphQL APIs
- AWS
- Google Cloud
- Azure
How it works
A simple, transparent process
- 01Day 1
Free discovery call
We learn your goals, users and constraints, and tell you honestly what it will take.
- 02Week 1
Scope & estimate
You get a clear plan, milestones and a fixed-price or time-and-materials estimate.
- 03Sprints
Design & build
Short development sprints with a live demo every week, so you are always in control.
- 04Launch
Launch & support
We deploy to AWS, Google Cloud or Azure and stay on to support and grow your product.
Not sure what it should cost?
Tell us what you want to build. We'll come back with a clear scope and a no-obligation estimate, completely free.
Insights
Guides on this topic
In-depth, sourced answers to the questions leaders ask before investing in AI and software.
Retool vs Custom Internal Tools: Finding the Break-Even Point
Retool vs custom internal tools, priced over three years from 2026 list prices: where custom overtakes Retool, which plan you really need, and when to switch.
Read article
Legacy Application Modernization Cost: Rehost, Refactor, Rebuild
Legacy application modernization cost by path: rehost from $9k, replatform $30k–$90k, rebuild $188k–$450k at $75/hr, plus a decision tree and 2026 deadlines.
Read article
Customer Portal Development Cost: Custom vs Off-the-Shelf
Customer portal development cost by tier: 516 to 1,908 engineering hours, $21,000 to $191,000 by team rate, plus off-the-shelf prices and a 3-year break-even.
Read articleFAQ
Questions, answered
Do you build websites or only web applications?
Both. We build marketing websites, but we specialize in web applications and custom software: products with logins, data, workflows and integrations.
Will I own the code?
Ownership and licensing terms are agreed upfront in your contract, before any work starts, so there are no surprises.
How much does a project cost?
Every project is different, so we don't guess. After a free discovery call you get a clear scope and estimate before you commit to anything. We offer fixed-price, time-and-materials and risk-free proof-of-value options, with no upfront setup fees.
Who actually does the work?
Fleurant AI scopes and manages your project and matches it with the right specialist team from our vetted delivery network: AI PhD researchers, certified cloud engineers and senior full-stack developers. You keep one accountable point of contact from start to finish.
What if I'm not sure what I need yet?
That's exactly what the free discovery call is for. We'll help you find where AI or custom software will create the most value, and give you honest advice even if that means a smaller project.
Free, no-obligation consultation
Ready to see what's possible?
Get a free, no-obligation consultation with a specialist. You'll leave with clear next steps, whether or not we work together.
Tell us about your project
Tell us about your project. A specialist will reply within 1 business day.