Custom business software developer in Rennes

Custom business software is management software built around the way you work. I develop it for small and medium businesses in Rennes, Brittany and across France: scheduling, inventory, quotes, time tracking, bookings, instead of Excel files, paperwork and repetitive tasks.

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  • 7 years of experience
  • 17 projects online
  • 5/5 on Malt
  • Reply within 24h
  • Free quote
  • No commitment
A business owner on the phone in her office Service company
Screen for creating a prospecting automation

Lead tracking and automatic follow-ups, for a service company.

Three ways to ask for it

Business web app, custom business tool or redesign of an existing tool: three requests, one way of working

Depending on the trade, people ask me for a “business web app”, a “custom business tool” or the “redesign” of software that no longer keeps up. Behind the words, the same work: start from your organisation, deliver a tool you own, in stages.

Business web app

Software that runs in the browser, on desktop, tablet and phone, with nothing to install. Your teams reach it anywhere, the data lives in one place and updates reach everyone at once.

See the tests by trade

Custom business tool

A tool that follows your rules (your packages, your rounds, your approval steps) rather than the other way round. We start from the way you work, not from off-the-shelf software to bend, and the tool grows with the business.

Estimate my budget

Redesign of an existing business tool

Your software runs on Access, Excel, old PHP or an app nobody maintains any more. I keep the data and the rules that work, and replace it in stages, without stopping the business.

Describe my current tool

Example tools

The tools I build

Each tool is designed around the way you work and the people who use it every day. It then grows with your business.

Quotes, invoices and customer follow-up

Prepare quotes faster, track invoices and find each customer's history.

Online booking

Let your customers book on their own, without back-and-forth emails or missed calls.

See an example: Izidoor

Automation and AI

Sort incoming requests, extract data from your documents or answer your customers' frequent questions.

See an example: GoupixDex

And it connects to what you already use

Your tool talks to your software instead of replacing it: payments, invoicing, emails, calendar, AI.

  • StripeOnline payments
  • QontoBanking and invoicing
  • PennylaneAccounting shared with your accountant
  • EBPQuotes and invoices
  • HubSpotCRM and customer follow-up
  • MailjetAutomatic emails
  • WhatsApp and SMSConfirmations and reminders
  • Google CalendarSynchronised calendars
  • Excel and CSVImports and exports
  • n8nAutomations between your tools
  • ClaudeArtificial intelligence
  • Your softwareConnection through an API

Work

Business apps already in production

See all business app projects

Pricing

How much does custom business software cost?

Most business applications for small and mid-sized companies cost between €5,000 and €15,000. The price depends on the number of screens, users and connections to your software: three questions are enough to size yours.

What kind of project?
What size?

Several screens, different roles and a few automations.

Options

Ranges based on projects already delivered. Net prices, VAT not applicable (article 293 B of the French General Tax Code).

Indicative estimate

€8,000 to €15,000

Duration
8 to 12 weeks
Maintenance
€100 to €300/month

The exact price is set in the quote, free and with no commitment.

Included in every project

  • Source code and data in your name
  • Step-by-step deliveries, to test as you go
  • Onboarding and training for your teams
Get a precise quote

To compare with the market, the custom software price barometer compiles the prices published by 14 French providers. The tools built for the teams and customers of a company are gathered in the B2B business application projects.

Looking for software for your trade in France? Each test takes 6 questions and gives the 2026 prices of the software on the French market.

Comparison

Off-the-shelf software, agency or custom-built?

Three ways to equip your business. Here is what changes, point by point, for a small or medium business.

Custom-built with Dibodev

  • Fits the way you workYes : Yes, built from your real processes.
  • PriceYes : A fixed price agreed before starting, often €5,000 to €15,000.
  • Point of contactYes : The developer directly, from the first call to maintenance.
  • Ownership of code and dataYes : Source code and data in your name.
  • ChangesYes : On demand, at the pace of your business.
  • Getting startedPartly : First deliveries within a few weeks.

What you get

A tool of your own, built to last

Written in black and white in every quote, so you know exactly what you are buying.

  • A tool you own

    The source code and your data are in your name, hosted wherever you want.

  • Your existing data imported

    Your spreadsheets and current software are imported: nobody starts from scratch.

  • Easy onboarding

    Your team is trained and gets a short documentation.

How it works

How a project works

One point of contact, from the first call to maintenance.

  1. Call

    A free first call

    We look together at how you work and what wastes your time. If existing software is enough, I will tell you.

  2. Quote

    A clear fixed-price quote

    Scope, price and milestones are set before we start: no bad surprises along the way.

  3. Development

    Delivery in stages

    You test the tool as the project progresses and your feedback is taken into account before launch.

  4. Support

    Launch and follow-up

    I import your existing data, train your team and take care of maintenance and improvements.

Client review

A word from a client

Verified review · Malt, May 2026

« We asked Léo for help on a Nuxt project. I recommend him because he understood our needs very quickly and worked fast and efficiently. I particularly appreciated how easy he was to onboard and to communicate with. »

GillesCTO of PrePeers

Client review published on Malt in May 2026, translated from French

See the review on Malt

FAQ

Frequently asked questions

How much does custom business software cost?

At a fixed price, between €5,000 and €15,000 for most small business tools (scheduling, inventory, quotes, time tracking). The price depends on the number of screens, users and connections to your software; a more complete platform can cost more. It is set in the quote before we start, and maintenance then costs €100 to €300 per month depending on the tool.

How long does it take to build the tool?

The timeline is set in the quote depending on the scope. I deliver in stages: you use a first version quickly, then the tool grows with your feedback.

Why a freelancer rather than an agency?

You talk directly to the person who designs and builds your tool, from the first call to maintenance. Fewer intermediaries, faster decisions and a price without agency overheads.

Do you only work in Rennes?

I am based near Rennes and travel within Rennes, Ille-et-Vilaine and Brittany when useful. I also work remotely with businesses across France.

Can you take over our Excel files?

Yes. I import the data from your existing files into the new tool, so your team does not start from scratch.

What if existing software is enough?

I will tell you on the first call. Custom software only makes sense when off-the-shelf tools do not fit the way you work.

Business application, business software, custom tool: what is the difference?

None in practice: all three mean software designed around the work of one specific company, such as scheduling, stock, quotes or time tracking. When the tool runs in a browser, it is also called a business web application.

Blog

Further reading

An Excel file getting out of hand? Let's talk about your tool.

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