Streamline Every Step of Oil Operations, Shipping and Accounting
Smarter oil operations start with
Turning measurement data into trusted oil accounting.
The industry's leading refineries and downstream operators trust Maron.
Leading refinery and terminal operators rely on OAS to improve operational efficiency, eliminate silos, and control costs across global supply chains.
Learn HowUnified tools for oil logistics & measurement
Meet Maron Systems
Maron’s platform brings shipping, accounting, and measurement defense into one integrated system — built to reduce risk and recover lost value.
- Connects operations, commercial and accounting teams in real time
- Modular by design, OAS lets you choose only the features your operations demand
- 150B+ barrels of storage capacity supported

See what Maron can do for you.
Get Started
Explore how our software fits your workflows, teams, and existing systems — and how it can reduce risk, loss, and time to insight.
Where shipping, inventory and accounting
OAS
Total Operational Visibility
See shipping, inventory, and accounting in one place.

Real-Time Insights
Make data-driven decisions instantly.

Seamless Integration
Connect operations, planning, and reporting effortlessly.
OAS
Power your operations with precision
Nomination to Delivery
Speed up hydrocarbon invoice cycles and improve cash recovery with faster access to inspection data.
Inventory Clarity
See actual and planned stocks across refineries and terminals, with ownership tracked.
Smart Scheduling
Drag-and-drop tools and built-in constraints keep planning efficient and reliable.
Actionable Insights
Dashboards and reports highlight KPIs, demurrage, and shipment trends for fast decisions.




Our Customers
See what our customers are saying
Smarter scheduling
OAS improved marine scheduling clarity and discipline, cutting demurrage by 50% in the first year.
Seamless integration
With OAS, data flows across trading, shipping, and refining, eliminating errors and scattered spreadsheets.
Trusted visibility
For over a decade, OAS has driven process improvement in shipments, stock, and refinery mass balances.
Our Blog
Blog & Articles
OAS v6 Announcement
Maron Systems Announcement: OAS is Upgrading Maron Systems is upgrading OAS infrastructure to offer the latest industry-forward technology. Strategically, this upgrade aims to provide users with a greater, competitive edge in the fast-changing digital environment by delivering security enhancements, improved…

Increasing Berth Efficiency – Starting with Berth Schedule Configurations
Recall a time when you had to rely on someone else’s schedule. It’s often an adjustment because everyone has their own system of organizing data – whether it’s personal or company preference. That’s why it’s imperative that our users can…

How to Optimise Berths for Success
Introduction Berth planning and optimization are critical components of efficient port operations. For berth and jetty schedulers, the ability to optimize these processes can lead to significant improvements in berth utilization and reduced demurrage costs. Here, we’ll discuss how OAS…

