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Certifiée ISO 27001 par AFNOR CertificationWhat is custom business software?
Custom business software is an application developed specifically for your company’s processes, rules, and users, as opposed to a standard SaaS solution that suits 80% of companies in your industry.
Your current software—whether it’s a CRM, ERP, or management tool—meets 80% of your needs. The remaining 20% are exactly what make the difference: your business rules, your internal processes, and the way you work. No off-the-shelf SaaS solution understands these. You adapt to the tool, working around its limitations with Excel exports, manual processes, and third-party tools that are connected as best as possible.
For 30 years, custom software development was reserved for large companies for economic reasons: it was simply too expensive. AI has changed everything. It eliminates the mechanical aspects of development and makes custom software accessible to small and medium-sized businesses. This is what IT Systèmes has standardized under the name“hyperdevelopment.”
Créer un logiciel métier pour votre entreprise
Pour créer un logiciel métier, IT Systèmes part de vos processus. Après un échange de cadrage, nous livrons une V0 : sous cinq à dix jours, une version fonctionnelle avec vos données réelles, votre vocabulaire métier et vos workflows. Vous jugez sur pièce, puis le logiciel est développé, mis en production et il évolue avec votre entreprise. Un CRM ou un logiciel métier démarre à 30 000 €HT pour 6 à 8 semaines de développement ; le code vous est cédé, sans licence par utilisateur.
Industry-specific software designed for your sector
Chartered accountant
Lawyers / Legal
Architect
Industry
Local Governments and the Public Sector
Service and consulting firms
Why Custom Software Can Transform Your Business
Custom software isn't just a productivity tool. It becomes the digital backbone of your business. Whereas standard SaaS forces you to adapt your processes to the tool, custom software flips that logic on its head: the tool adapts to the way you work.
In practical terms, deploying custom software means:
- Your business processes are followed 100% of the time instead of 80%, without having to resort to workarounds in Excel or third-party tools
- Elimination of recurring SaaS subscriptions in favor of a one-time, amortizable cost
- Complete independence from software vendors: the source code belongs to you
- Evolution driven by your business needs, not by a vendor’s roadmap
Pendant 30 ans, cette approche était réservée aux grandes entreprises. L'IA générative et l'hyperdéveloppement changent la donne : ce qui mobilisait une équipe pendant 3 mois se réalise désormais en quelques jours, supervisé par des experts seniors. Les gains de productivité sont intégralement répercutés sur les tarifs. Une fois le logiciel en production, notre tierce maintenance applicative (TMA) assure sa correction, ses mises à jour et son évolution.
Starting at €5,000 (excluding tax), unlimited users, source code and rights transferred, hosting in France. From small tools to full-scale ERP systems, our pricing and timelines are broken down by tier on our custom software development page.
Why Choose IT Systèmes for Your Business Software
- Software Developer AND Integrator: We don’t just develop your software. We integrate it into your existing IT systems (ERP, CRM, EDM, Microsoft 365, Active Directory) so that it fits seamlessly into your daily workflow.
- Hyperdéveloppement assisté par IA : notre équipe utilise l'IA générative pour accélérer la production de code et les tests. À l'échelle d'un projet complet, le rapport est de 6 à 12 selon le palier par rapport à un développement classique.
- Agile methodology with short sprints: incremental deliveries every 2–3 weeks. You test, you validate, and we make adjustments.
- Robust, cloud-native architecture: microservices, containers, REST APIs, DevSecOps. Scalable, secure, and portable.
- Sécurité et conformité dès la conception : RGPD, NIS2. Chiffrement, authentification forte, audit à chaque sprint.
- Maintenance and Long-Term Evolution (TMA): Your software grows and evolves alongside your business.
- Un prestataire établi : depuis 2010, 44 collaborateurs et plus de 300 clients actifs.
- Certification : Certifiée ISO 27001 par AFNOR Certification (certificat n° 2026/119451.1) depuis le 21 septembre 2026.
Hyperdevelopment, our signature method
After two years of R&D, IT Systèmes has brought a methodological breakthrough to market. AI does not replace our developers; it eliminates the routine aspects of their work.
Nos équipes se concentrent désormais sur le savoir-faire métier et l'architecture, pendant que des agents IA spécialisés génèrent le code et les tests. Un projet qui mobilisait une équipe pendant 3 mois est désormais bouclé en quelques semaines, pour un coût 5 à 7 fois inférieur aux devis d'il y a quelques années.
« Nous allons pouvoir développer plus vite des solutions et rendre accessibles au plus grand nombre ces fameux outils métiers. »
Samir Amara, Président d'IT Systèmes, juin 2026, espace contenu partenaire des Échos
Learn more about our expertise as a software publisher and integrator →
pour un CRM sur mesure, contre 12 à 18 mois en développement classique
Proprietary code provided to the customer
Standard SaaS or custom software?
Six structural differences that can help you make the right choice based on your situation.
- Adaptation to your processes: 80% with standard SaaS, 100% with custom software tailored to your company’s unique needs.
- Ownership of the code: With SaaS, you’re renting. With custom development, you own 100% of the source code.
- User cost: SaaS billed per seat on a monthly, tiered basis. Custom plan: unlimited users, one-time payment.
- Functional evolution: With SaaS, you’re at the mercy of the vendor’s roadmap. With a custom solution, you’re in control.
- Hosting and data: SaaS solutions are often hosted outside the EU. Custom solutions: hosting in France, native GDPR compliance.
- Total cost over 5 years: increasing for SaaS, stable and amortizable for custom solutions.
To learn more: Business Software: Definition, Benefits, and Custom Development.
They canceled their SaaS subscription
Obeevi, an independent audiovisual production company, had been searching for years for a tool capable of adapting to its highly specific production processes. No off-the-shelf solution met their needs. In just 22 days, IT Systèmes delivered a unified CRM and project management tool, custom-designed for their workflows.
“Our business is unique, and our processes are what set us apart. We now have the tool that allows us to digitize our expertise.”
Styde Jacquin — Co-CEO, Obeevi
From Need to Custom CRM Implementation
Unified CRM and Project Management
You only pay once you're satisfied. Our teams build a Version 0 of your software based on your requirements. If you approve it, we scale up production. Otherwise, you pay nothing.
Request my V0Offer subject to eligibility: formalized use cases or specifications required.
Start with a free AI agent audit →A requirements document or use cases? We'll use your work as a starting point to define the scope of V0 during a 30-minute discussion.
Within 5 to 10 days, a working version based on your use cases: your actual data, your business terminology, and your workflows.
Not convinced? You won't pay a thing and can keep the V0 as a demo, with no obligation.
Audit
ROI Calculation
Working prototype (not a set of specifications)
Development in 2-week sprints
Deployment and Continuous Improvement
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FAQ: Custom Business Software
What is the difference between custom business software and standard SaaS?
Standard SaaS solutions (Salesforce, Sage, Monday, etc.) address general-purpose needs. Custom business software is designed specifically for YOUR processes, YOUR management rules, and YOUR users. You don’t have to adapt your business to the tool—the tool adapts to you. And you own it.
How long does it take to develop business software?
With our AI-powered Agile methodology, a simple application can be delivered in 6 to 8 weeks. A full-featured software solution with integrations (ERP, CRM, EDM) takes 3 to 5 months. Thanks to short sprints, you’ll have usable versions as early as the first few weeks.
How much does custom business software cost?
Our pricing packages are transparent and all-inclusive, ranging from small-scale projects to ERP or core business initiatives, with a set price and timeline for each tier. Details are available on our custom software development page. Ongoing maintenance (TMA) accounts for 15 to 20% of the initial cost per year.
What technologies do you use?
Backend: Java, Python, C#, PHP. Frontend: ReactJS, NextJS, VueJS. Databases: SQL Server, PostgreSQL, MongoDB. Cloud: Azure, AWS. Integration: REST APIs, GraphQL. Security: DevSecOps, Azure AD, MFA, TLS encryption. We choose the best combination based on your specific needs, without locking you into a single technology.
How does AI accelerate development?
Notre équipe utilise l’IA générative à chaque étape : génération de code boilerplate, écriture de tests unitaires, documentation automatique, revue de code assistée, génération de maquettes UX. L’IA ne remplace pas le développeur : elle prend en charge le code répétitif, sous la supervision d’experts seniors. À l’échelle d’un projet complet, le rapport est de 6 à 12 selon le palier par rapport à un développement classique.
How do you integrate the software into my existing IT system?
We connect your business software to your existing tools via secure APIs (REST/GraphQL), native connectors (Power Automate, M365), or custom middleware (FlexFlow) for legacy systems without APIs. No overhaul of your IT infrastructure is required.
Is there any financial assistance available for business software?
Yes. There are several programs available for small and medium-sized businesses (SMEs): the research tax credit (CIR) if the project involves innovation, BPI France grants (digital loans), regional digital vouchers, and France Num programs. We can help you identify the grants that are best suited to your project.
What happens after the system goes live?
We offer a third-party application maintenance (TMA) contract that covers: bug fixes, security updates, functional enhancements, and user support. Your software isn’t static—it evolves alongside your business. Our contracts have no minimum term.