CRM · In-house tool
Private studio CRM
The custom-built CRM that runs the studio’s clients, projects and sales follow-up. Secure access, usable on desktop, iPad and phone, with no generic software subscription.
Custom software studio · Paris
Your CRM, web app, desktop software or website, made to measure.
Maison SASSI designs and builds the tools that run your business: CRMs, web applications, desktop software and websites. Shaped around your methods, with AI built in wherever it truly saves you time.
Free quote, reply within 48 hours
One point of contact, from scoping to support
1 month of support included after launch
Example of a custom CRM interface · sample data
Proven technologies, chosen to last
TypeScriptReactNext.jsNode.jsPHPPostgreSQLMySQLWordPressStripeAI APIsWindowsmacOSMobile apps (PWA)HTML & CSS
Services
One studio, five crafts.
We start from the way you work, not from a product to sell. Then we build exactly the tool you need, and nothing more.
Custom CRM
Clients, deals, quotes, invoices, scheduling: a CRM that follows your sales process exactly. No useless menus, no per-user licence fees.
Business web apps
Back-offices, client portals, booking, inventory. Available anywhere, on desktop, tablet and phone.
Desktop software
Fast, reliable software installed on your computers, with automatic updates and an admin console.
AI built into your software
Document reading, archive search, assisted writing, summaries: AI becomes a feature of your tool, triggered by your team whenever they need it.
Websites
Showcase sites, e-commerce, landing pages: fast, elegant, optimised for Google from day one and connected to your tools.
For the long run
Hosting, maintenance, new features.
Your software grows with your business: new features, backups, security updates.
HostingBackupsSecurityNew features
Why custom
The software adapts, not you.
Off-the-shelf software is sometimes enough, and we will tell you so. But when the way you work is what sets you apart, a custom tool strengthens it instead of constraining it.
Off-the-shelf software
You adapt.
- ✕Your methods bend to the toolImposed fields, pointless steps, workarounds in spreadsheets.
- ✕A subscription per userThe bill grows with every hire.
- ✕Dozens of unused featuresAnd sometimes not the one you need.
- ✕The vendor’s roadmapYour requests wait, or never arrive.
Maison SASSI software
The tool adapts.
- ✓Exactly your steps, your documents, your vocabularyYour team feels at home from day one.
- ✓No per-user licence feesAdd team members at no extra licence cost.
- ✓Only the features you useA simpler tool, so one that actually gets used.
- ✓Your priorities drive what comes nextNew features follow your business, at your pace.
Process
From idea to tool, in full view.
You watch your software take shape at every step. No technical skills needed on your side.
01
Scoping
We get to know your business, your current tools and what wastes your time. You receive a detailed quote and a realistic schedule.
- A free conversation about your business
- An inventory of your tools and data
- A clear quote, no commitment
Quote D-2026-031 · Custom CRM4 modules · 3-stage schedule
Sales pipelineQuotes & invoicesExcel files imported
02
Mock-ups
Before the first line of code, you approve the screens of your future tool. Changes cost far less on a mock-up than in software.
- Key flows and screens
- Your feedback built in
- Sign-off before development
03
Development
We deliver in stages on a test environment: you try it, you comment, we adjust. No black box.
- Incremental releases
- Test access for your team
- Fixes before go-live
04
Go-live & support
Data migration, onboarding with your team, then one month of support included. After that, maintenance and new features if you wish.
- Migration of existing data
- Guided onboarding
- 1 month of support included
Work
Real tools, in production.
A few examples of what we have built. Our clients’ names stay confidential; their tools run every day.
Windows software · Web console
Installed software + remote management
Software deployed across an organisation’s computers, managed from a web console: status of each computer, last check-in, settings applied remotely.
Websites · Multilingual
Multilingual showcase websites
Elegant, fast websites in several languages, with forms connected to our clients’ tools.
50+projects delivered since Maison SASSI was founded
48 hto receive a first reply to your request
1single point of contact, from scoping to support
30 dof support included after go-live
Working together
Start simple. Grow from there.
Three ways to start, always quoted, after a free first conversation.
Scoping
An outside look at your tools and methods to decide what to build, in what order, and for what budget.
- A conversation about your business and tools
- Scope of the first version
- Detailed estimate and schedule
QuotedRequest
Custom software
We design, build and launch your CRM, web application or desktop software.
- Mock-ups approved before development
- Staged releases, test access
- Migration of your existing data
- 1 month of support included
QuotedStart a project
Maintenance & growth
Your tool stays fast, secure and up to date, and grows with your needs.
- Hosting and backups
- Security updates
- New features on request
SubscriptionSee plans
Our commitments
What you can count on.
Transparency
You always know where your project stands, what is done and what is left.
No budget surprises
A detailed quote before we start. Any change of scope is priced and approved by you.
Protected data
Personal accounts, per-user permissions, backups. We explain where and how your data is hosted.
A true partner
One point of contact in Paris who knows your project and answers without jargon.
FAQ
Questions we often hear.
Another question? Write to us: we reply personally, within 48 hours.
Every project is quoted for free, based on its scope. We often suggest starting with a first version focused on the essentials, then building on it: you invest step by step, seeing the results.
It depends on the scope. The quote includes a precise schedule, and we deliver in stages: you use the first screens long before the project ends.
If existing software meets your needs, we will tell you. Custom software makes sense when your methods are specific, when you pay for many per-user licences, or when you juggle several tools and spreadsheets.
Yes. Migrating your existing data (spreadsheets, old CRM, exports) is assessed during scoping and included in the quote.
The web applications we build adapt to every screen: desktop, tablet and phone. For installed desktop software, we define the target computers together.
We can take care of everything with a maintenance plan: hosting, backups, security updates and new features. If you prefer to host it yourself, we adapt.
Specific, everyday features: reading a document to pre-fill a record, finding information in your archives, suggesting a draft you review. Your users trigger them, and we tell you which provider processes the data.
A tool that fits you can be built.
Tell us how you work today. We will tell you, plainly, what custom software could change, and what it would cost.