COMPARISONS

OpusFlow vs Gaussol Features Comparison

OpusFlow's features and community driven approach make it the best Gaussol alternative you can wish for.

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Find out how OpusFlow stacks up against Gaussol
Join over 3.000 installers using OpusFlow

Why Switch?

If you’re comparing Gaussol with OpusFlow, you’re likely looking for a platform that can support the full lifecycle of your installation business, not just individual steps. OpusFlow brings your sales, planning, design, operations, CRM and more into one cohesive system, giving you clarity and control from start to finish. It’s designed to help installers work more efficiently, and build a smoother, more scalable business.

OpusFlow vs Gaussol
at a glance

The features that matter most to your business, compared side by side.

Gaussol

€50-€540/month
Per licence

OpusFlow

€99
Per License
Fully Cloud-Based
Yes, native included
Yes, native included
User Management
No data available
Yes, native included
Heat Pump Calculator
Not included
Yes, native included
Solar Design Software
Yes, native included
Yes, native included
CRM
No data available
Yes, native included
Customer Portal
Not included
Yes, native included
Invoicing (Accounts)
No data available
Yes, native included
Purchasing & Stock
No data available
Yes, native included
Planning
No data available
Yes, native included
Internal dashboarding
No data available
Yes, native included
Internal Tickets & Chats
Not included
Yes, native included
Internal Forms & Site Survey Forms
Yes, native included
Yes, native included
Document Management
No data available
Yes, native included
Custom built & DIY automations for workflow
No data available
Yes, native included
Warehouse Management
Not included
Yes, native included
Project Management
Yes, native included
Yes, native included
Battery Calculator
Not included
Yes, native included
AI Data Assistant
Not included
Yes, native included
Time Registrations
Not included
Yes, native included
Open API
Not included
Yes, native included
Quotations
Yes, native included
Yes, native included
Contract Management
Not included
Yes, native included

Gaussol

€50-€540/month
Per licence

OpusFlow

€99
All-in-one Price
Fully Cloud-Based
Gaussol
OpusFlow
Yes, native included
Yes, native included
User Management
Gaussol
OpusFlow
No data available
Yes, native included
Heat Pump Calculator
Gaussol
OpusFlow
Not included
Yes, native included
Solar Design Software
Gaussol
OpusFlow
Yes, native included
Yes, native included
CRM
Gaussol
OpusFlow
No data available
Yes, native included
Customer Portal
Gaussol
OpusFlow
Not included
Yes, native included
Invoicing (Accounts)
Gaussol
OpusFlow
No data available
Yes, native included
Purchasing & Stock
Gaussol
OpusFlow
No data available
Yes, native included
Planning
Gaussol
OpusFlow
No data available
Yes, native included
Internal dashboarding
Gaussol
OpusFlow
No data available
Yes, native included
Internal Tickets & Chats
Gaussol
OpusFlow
Not included
Yes, native included
Internal Forms & Site Survey Forms
Gaussol
OpusFlow
Yes, native included
Yes, native included
Document Management
Gaussol
OpusFlow
No data available
Yes, native included
Custom built & DIY automations for workflow
Gaussol
OpusFlow
No data available
Yes, native included
Warehouse Management
Gaussol
OpusFlow
Not included
Yes, native included
Project Management
Gaussol
OpusFlow
Yes, native included
Yes, native included
Battery Calculator
Gaussol
OpusFlow
Not included
Yes, native included
AI Data Assistant
Gaussol
OpusFlow
Not included
Yes, native included
Time Registrations
Gaussol
OpusFlow
Not included
Yes, native included
Open API
Gaussol
OpusFlow
Not included
Yes, native included
Quotations
Gaussol
OpusFlow
Yes, native included
Yes, native included
Contract Management
Gaussol
OpusFlow
Not included
Yes, native included
Not listed in public documentation as of June 4, 2026
Join over 3.000 installers using OpusFlow
“The ability to adapt our own formats and processes without depending on consultants gives us the freedom to grow and develop as a company.”

Reasons to choose OpusFlow

Most platforms track your projects. OpusFlow tracks your margins. Built from the ground up for solar and sustainable energy installers, it connects every job, every euro, and every team member in one system.

Below, we break down some of OpusFlow’s key capabilities that make it a powerful all-in-one alternative in the Gaussol vs OpusFlow comparison.

Bring your entire operational workflow into OpusFlow all-in-one system

OpusFlow is designed as a single platform that covers the full lifecycle of an installation project. Sales activities, project planning, documentation, communication, and financial processes all live in one connected environment, eliminating the need to switch between multiple tools.

With one system as the backbone of your business, information stays consistent and accessible across teams. This reduces errors, improves collaboration, and gives you clear oversight of everything that’s happening, from first lead to final delivery.

OpusFlow creates a clear and professional customer journey

OpusFlow helps you manage customer relationships with clarity and structure throughout the entire journey. All interactions, documents, and project updates are stored centrally, giving your team a complete view of each customer at every stage.

Customers benefit from clear communication through Customer Portal, timely updates, and easy access to information, while your team avoids miscommunication and duplicated work. This structured approach builds trust, improves satisfaction, and supports long-term customer relationships.

OpusFlow supports business growth across multiple renewable technologies

OpusFlow is built for installation businesses that want to expand beyond solar. The platform supports a wide range of renewable technologies, including heat pumps, battery storage, EV chargers, wind turbines, and future energy solutions.

As your offering grows, OpusFlow adapts without adding complexity. You can manage different project types, technologies, and teams within the same system, giving you the flexibility to grow your business while maintaining operational control.

Battery calculator | OpusFlow
Automations | OpusFlow

Automate your processes with OpusFlow to keep projects moving efficiently

OpusFlow automation tools help streamline everyday operations by removing manual steps from your workflow. Tasks, reminders, updates, and follow-ups are triggered automatically as projects progress through different phases.

This automation improves reliability and consistency across projects. Your team spends less time coordinating work and more time delivering results, allowing the business to operate faster without increasing workload.

Connect with thousands of tools through extensive API integrations

OpusFlow integrates with over 6,000 external tools, allowing you to connect the platform seamlessly with the systems you already use. From accounting and CRM tools to marketing, analytics, and custom software, data can flow automatically between platforms.

These integrations give you flexibility and future-proof your setup. OpusFlow becomes the central operational hub of your business while remaining open and adaptable to your evolving technology stack.

API integrations | OpusFlow
Primary benefits of ERP systems - Opusflow

OpusFlow has all the solutions for your business

Empower your business with OpusFlow: a comprehensive solution for all your needs.

Customer Testimonials

Making the switch is a big decision. These companies made it, and here’s what changed.

“The ability to adapt our own formats and processes without depending on consultants gives us the freedom to grow and develop as a company.”
David van Duijnhoven - Co-owner
100% ZONNIG.nl
“With OpusFlow, we can quote as much as we need without worrying about hidden costs. That’s a big deal when you’re growing.”
Stijn de Rooij - Co-owner
Zenovo
“The transition to OpusFlow has been a game-changer for Smart-NRG and I would highly recommend it to other solar installation companies for its all-in-one solution and cost-effective benefits.”
Smart-NRG
Bart Wansink - Director
Smart-NRG

FAQ

Everything you want to know before booking a demo.

Can we manage subcontractors and external users separately from internal staff?

Yes. OpusFlow lets you create distinct user profiles with separate permission sets for internal team members, subcontractors, and any other user type you need. Subcontractors can be given access to only the specific modules and records relevant to their work, with no visibility into financial data, other clients, or internal processes. Access can be time-limited and revoked immediately when a project ends.

What does the leave management module cover?

You can configure leave types such as vacation, sick leave, and personal leave, each with their own rules and accrual settings. Employees submit requests through a calendar view that shows their own balances and any existing approved leave. Managers approve or reject via a dedicated workflow and approved leave is immediately reflected on the planning calendar. The module also surfaces working-hours compliance warnings in hour registrations, so break and shift rules are checked as hours are logged rather than after the fact.

Is the heat loss calculation certified to a recognised standard?

Yes. The calculation follows the DIN EN 12831-1:2017 methodology, which is the recognised European standard for determining building heating load. It covers per-room heat loss including U-values, thermal bridges, ventilation, airtightness, and surface adjacency. The output is a DIN-compliant PDF report that includes a per-room breakdown, total heat demand, and the final hardware recommendation — suitable for use as supporting documentation with the customer or for your own internal records.

What security standards does OpusFlow support?

OpusFlow supports Single Sign-On (SSO) and Multi-Factor Authentication (MFA) for all users. Every login event and critical data action is recorded in an immutable audit log that cannot be edited or deleted. Role-based access control ensures users only interact with the data and modules relevant to their role. For businesses operating across multiple entities, each company can be managed with independent access configurations under the same overarching account.

What happens if a product is on backorder and it affects an upcoming installation?

OpusFlow tracks backorder status at the order line level and feeds the expected delivery date directly into project scheduling. That means a delay from a supplier surfaces in the planning view before it becomes an install-day problem, giving your team time to source an alternative or reschedule rather than discovering the shortage on the morning of the job.

Does OpusFlow have a time registration module?

Yes! All your employees can log their hours directly in OpusFlow via the mobile web app. Time registrations are linked to projects, so you always have a clear picture of project profitability including labor costs.

How does the automated invoicing work?

When a project reaches the invoicing stage, OpusFlow pulls the line items directly from the project’s Bill of Materials and generates the invoice automatically, with correct quantities, pricing, and totals already populated. For service contracts, you set a billing frequency at the start and the system generates and sends invoices on schedule without anyone triggering it manually. A built-in dry-run mode lets you simulate a billing cycle before it goes live.

See how OpusFlow stacks up against others

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