Build your company's internal system, not your SaaS bill.
Restack helps SMBs replace fragmented tools with an AI-powered internal platform they can own, customize and scale.
From CMS and invoicing to projects, OKRs and integrations: Restack gives you modular building blocks to create exactly the system your team needs.
We deliver this quickly and with deep customization because AI isn't an add-on: it's the core of the system for shipping new features fast and safely.
Market signal
“Writing software will be like being painter.”
Elon Musk, quoted by Outlook Business (2025). Free translation: software will become increasingly fluid and modular, and the advantage will come from iterating quickly around business needs.
View source articleValue proposition
A modular platform tailored to your workflows
Most teams operate with too many SaaS tools: expensive, rigid and hard to integrate. Restack flips that model with full ownership of software and data.
SaaS sprawl
Fragmented and expensive stack
- Notion / AirtableKnowledge + data
- Holded / FacturaDirectaInvoicing
- Asana / ClickUp / MondayProjects and tasks
- Zapier / Make / automationsIntegrations
Unified internal system
One unified internal platform
- Local modules (editable source code) for each use case.
- One client = one codebase + one database project.
- Architecture ready for upgrades, security and technical governance.
- System designed to launch new features quickly and safely.
- AI built into operations with permissions and auditability.
Quick calculator
Estimate your savings by consolidating your SaaS ecosystem
Simulate your current setup and see how much you could save with a modular internal system designed to evolve quickly and safely.
Tell us about your operations
Configure your current stack and we'll return an indicative estimate to consolidate it with AI as the operational core.
Modules to consolidate first (with SaaS examples)
Estimated annual savings
€24,062
€16,454 vs €40,516
Current ecosystem annual cost
7 -> 1 platform
Tool consolidation
262 h/year
Technical overhead avoided
One client = one dedicated codebase and database. No vendor lock-in.
Local and customizable modules for your real workflows, no black box.
AI at the core to create and adjust features in very short cycles.
Architecture prepared to deliver fast changes with security and governance.
Why teams choose Restack
Lower total cost
Reduce total cost by removing subscriptions, redundant licenses and integration overhead.
Real roadmap control
Your team sets priorities and features without depending on a third-party release schedule.
Faster iteration
Adjust internal processes in days, not quarters. With AI at the core, you iterate and customize without friction.
Clean architecture
Built to create new capabilities quickly, safely, auditably and with governance from day one.
AI with permissions and traceability
Assistant and automations with access control and activity logs for operations.
Use cases
Replace Notion/Airtable + invoicing + PM + OKRs with a single internal system.
Build client-specific internal systems without starting from scratch.
Consolidate operations data into a single source of truth.
Add custom workflows that off-the-shelf SaaS cannot support.
One client = one codebase + one database project
This enables full control over data, roadmap and compliance. You can scale without vendor lock-in and adapt each module to your processes.
- Modules are not closed plugins: they are editable local code.
- Integrations and automations inside the same internal system.
- AI assistant connected to your data, with role-based permissions.
- System prepared for auditability, security and continuous evolution.
Our stack used to be a sum of disconnected tools. They worked, but made us slower and dependent on third-party software. My Fridays were pure administrative work.
With Restack (AIOS) we're building our own operating system (back office). CRM, invoicing, proposals, documentation and control in one place, adapted to how we actually work, not how generic SaaS says we should work.
The most valuable part hasn't only been the technology. It's been operational clarity and knowing this is just the beginning of a continuous evolution that will make us better.
It's not a magic or automatic solution. It forces you to think rigorously about your business. But if you do that work, the result is a strategic asset, not a cost.
Manu Icarrieta
CEO, Deca Comunicación
Want to consolidate your SaaS ecosystem into one platform?
Open the calculator, share which SaaS tools you use today and we'll send you a modular migration proposal.