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Custom Software Development for Small and Medium-Sized Businesses
An ERP, a CRM, or a custom business tool developed specifically for your processes—not for those of your industry in general. Transparent pricing, source code that belongs to you, and hosting in France.
You pay only once the first version has been approved.
How much does custom software development cost?
Most agencies do not publish their rates. Here are ours, along with the associated turnaround times.
Replaces an Excel file, an Access database, or a small, specialized program. A specific need, a modern web interface, and built-in AI when needed.
Replaces Salesforce, HubSpot, Dynamics, or Sellsy. Your sales process as it actually works, your dashboards, and your business rules.
Replaces Odoo, SAP, Oracle, or Cegid. Comprehensive management: CRM, purchasing, inventory, invoicing, and time tracking, with AI applied to your business data.
All plans include data migration, an unlimited number of users with no per-seat cost, full ownership of the source code, and GDPR-compliant hosting in France. These three tiers cover the vast majority of the custom business software projects we deliver.
To understand how a budget is put together line by line, read our guide on how the budget for custom software is calculated.
Test your software before you pay
A custom development project is rarely decided based on a quote alone. The decision is made once you see the tool in action with your own data. That’s what we deliver first.
Tell us what you need
A set of specifications, use cases, or simply a description of your processes. We’ll work with you to define Version 0 during a 30-minute discussion.
We're building your V0
Within five to ten days, a working version of your software, featuring your actual data, your business terminology, and your workflows.
It's up to you
If you're convinced, we'll move forward with production. If you're not convinced, you won't pay anything and you can keep Version 0 as a demo. No hidden charges.
From Audit to Production Launch
Flash Audit
We identify the tool to be replaced and analyze your current processes, pain points, and potential gains. This phase is free and requires no commitment.
Cost Estimate
We compare the cost of your current solution with that of the proposed solution, with projections for one, three, and five years. You make your decision based on numbers, not on a promise.
A working prototype rather than a set of specifications
We use your initial specifications to produce a prototype in just a few days. You can then approve it based on a tangible prototype. This approach reduces misunderstandings and speeds up the launch.
Two-week sprints
Deliverables every two weeks, with progress visible on a shared dashboard, and priorities that can be adjusted as needed. Clean, well-documented architecture that any qualified developer can take over. API integration with your existing ecosystem, and AI agents for businesses when automation is warranted.
Deployment and Evolution
Data migration, training for your teams, and phased deployment. Then, updates tailored to the pace of your business. Our contracts have no minimum term.
What You'll Own at the End of the Project
- Full ownership of the source code. You can entrust it to another service provider, have it audited, or bring it in-house.
- An unlimited number of users, with no per-seat cost. Your bill doesn't go up as your teams grow.
- Hosting in France that complies with the GDPR, with data that never leaves the country.
- Upgradeable maintenance, if you choose, with no long-term commitment.
- Compliance built in from the design phase: GDPR and NIS2 requirements, as they apply to your business. IT Systèmes has initiated the ISO 27001 certification process.
Custom Development or Off-the-Shelf Solution: How to Decide
A custom solution isn't always the right choice. There are six criteria to help you decide based on your actual situation.
| Criterion | Market Solution | Custom Development |
|---|---|---|
| Adaptation to Your Processes | You adapt your processes to the tool | The tool adapts to your processes |
| Code ownership | You are renting access | You are a homeowner |
| Cost per user | Billed per seat, monthly | Unlimited users |
| Functional Evolution | You are following the publisher's roadmap | You decide the priorities |
| Data hosting | Often outside the European Union | France, GDPR-compliant from the start |
| Cost Structure | Subscription that grows with the number of employees | Depreciable investment |
If your needs are standard and your headcount is stable, an off-the-shelf solution is often the fastest and least expensive option. A custom solution becomes relevant when your processes are your source of added value, when you’re relying on more and more Excel workarounds, or when the cost per user becomes your largest software expense.
For the specific case of SaaS, see our page on developing a SaaS application.
They canceled their subscriptions
Obeevi, an independent audiovisual production company, had been searching for years for a tool that could adapt to its production processes. No solution on the market could meet that need. In twenty-two days, we delivered a unified CRM and project management tool that replaced three separate subscriptions.
Read the full case study“Our business is unique, and our processes are what set us apart. We now have the tool that allows us to digitize our expertise.”
IT Systems by the Numbers
Frequently asked questions
How much does it cost to develop custom software?
At IT Systèmes, a micro-tool starts at €5,000, a custom CRM at €30,000, and a full-featured ERP at €90,000. The price depends on the number of processes covered, the volume of data to be imported, and the connections to be established with your existing tools.
How much does it cost to develop an app?
A simple business application—designed to replace an Excel file or a small, specialized program—starts at €5,000 for fewer than ten days of development. A comprehensive management application, with multiple user profiles and connections to your information system, falls into higher price brackets.
How long does it take to develop custom software?
Less than ten days for a micro-tool, less than fifty days for a CRM, and less than one hundred days for an ERP. A functional initial version is delivered to you within five to ten days, before any financial commitment is made.
Who owns the source code?
It’s entirely up to you, as soon as it’s delivered. You can have it audited, outsource it to another service provider, or handle it in-house.
What happens if we stop working together?
You retain ownership of the software and its source code. Our maintenance contracts have no minimum term. The code is written according to industry standards and is well-documented, specifically so that a third-party team can take it over.
Is it possible to upgrade existing software rather than start from scratch?
Yes, and that's often the best option when the existing application is still functional. We specialize in modernizing business applications and taking over legacy code.