Choosing the right IHM compliance platform for your fleet
With the Hong Kong Convention (HKC) entering into force in June 2025 and the EU Ship Recycling Regulation (EUSRR) already mandating Inventory of Hazardous Materials (IHM) compliance for vessels calling at EU ports, the need for robust digital IHM maintenance software has never been greater. Fleet operators must now maintain accurate, up-to-date IHM Part I records throughout a vessel's operational life, manage Suppliers' Declarations of Conformity (SDoC) and Material Declarations (MD) for every onboard material change, and ensure continuous compliance across multiple regulatory frameworks.
Manual tracking through spreadsheets and paper-based processes is no longer viable at scale. Modern IHM maintenance platforms offer cloud-based tracking, automated regulatory updates, and integration with procurement and training systems to streamline compliance workflows. However, these platforms vary significantly in scope, features, and pricing models.
This comparison provides an objective overview of the leading IHM maintenance software solutions available in 2026, evaluating their features, integration capabilities, and suitability for different fleet sizes and compliance needs. Whether you manage a single vessel or a fleet of hundreds, this guide will help you identify the platform that best fits your operational requirements.
A comprehensive look at how the top IHM maintenance software platforms compare across key capabilities and compliance features.
| Feature | VSIMS (Varuna Sentinels) | DNV IHMM | SDSD | Mastex MXSuite | MarineMechanics |
|---|---|---|---|---|---|
| Cloud-based Platform | Yes | Yes | Yes | Yes | Yes |
| IHM Part I Maintenance | Yes | Yes | Yes | Yes | Yes |
| IHM Part II & III | Yes | Limited | No | No | No |
| SDoC/MD Management | Yes | Yes | Yes | Yes | Yes |
| Automated Regulatory Updates | Yes | Yes | No | No | No |
| Circular Economy Tracking | Yes | No | No | No | No |
| ESG Integration | Yes | No | No | No | No |
| LCA Integration | Yes | No | No | No | No |
| CBT Training Module | Yes | No | No | No | No |
| Marine Procurement (MPS) | Yes | No | No | No | No |
| Class Society Approvals | Yes | Yes (DNV) | Yes | Yes | Yes |
| Multi-fleet Support | Yes | Yes | Yes | Yes | Limited |
| Real-time Reporting | Yes | Yes | Limited | Limited | No |
| API Integration | Yes | Yes | Limited | No | No |
| Mobile Responsive | Yes | Yes | Yes | Limited | Limited |
| Pricing Model | Subscription | Enterprise | Per vessel | Per vessel | Per vessel |
An in-depth look at each IHM maintenance software provider, their strengths, and what sets them apart in the maritime compliance landscape.
VSIMS (Varuna Sentinels Integrated Maritime Solutions) stands apart as the only platform in the market that delivers a fully integrated 7-platform suite covering the entire spectrum of maritime compliance. Beyond core IHM Part I, II, and III maintenance, VSIMS connects seamlessly with ESG reporting, Life Cycle Assessment (LCA), Computer Based Training (CBT), Marine Procurement System (MPS), the Circular Maritime Economy platform, and a real-time Live Reporting Portal. This integration means that a single material change on a vessel automatically flows through to compliance records, ESG disclosures, and procurement tracking without duplicate data entry.
Serving over 500 vessels across 50+ global partners, VSIMS has established itself as a trusted platform for major ship managers including Hapag-Lloyd, Synergy Group, Bernhard Schulte, and Swire Shipping. The platform's blockchain-based circular economy tracking provides verifiable, immutable records of hazardous material disposition throughout a vessel's lifecycle and into the ship recycling process, a feature that no competing platform currently offers.
Headquartered in the Netherlands with a team of experienced maritime professionals, Varuna Sentinels combines deep industry expertise with modern technology. The subscription-based pricing model offers predictable costs for fleet operators of all sizes, and the platform's responsive design ensures that crew and shore-based teams can manage compliance workflows from any device. VSIMS supports all major class societies and provides automated updates when regulatory frameworks such as the HKC, EUSRR, or REACH SVHC lists are amended.
DNV IHMM is the IHM maintenance module offered by DNV, one of the world's largest and most recognized classification societies. Leveraging DNV's extensive regulatory expertise and its position as both a classification body and a service provider, the platform delivers robust IHM Part I maintenance with strong enterprise-grade features. DNV IHMM benefits from direct integration with DNV's class survey processes, making it a natural fit for vessel owners already classed with DNV.
The platform offers automated regulatory updates, comprehensive SDoC/MD management, and real-time reporting dashboards that provide fleet-level visibility into compliance status. API integration capabilities allow connection with existing fleet management systems. However, IHM Part II and III support remains limited compared to more specialized providers, and the platform does not extend into ESG reporting, LCA, circular economy tracking, or crew training modules.
DNV IHMM follows an enterprise pricing model, which may be more suitable for larger fleet operators with existing DNV relationships. While the platform excels in its core IHM maintenance capabilities, organizations seeking a broader compliance ecosystem that covers sustainability reporting and end-of-life vessel management may find that additional third-party solutions are needed to fill the gaps.
SDSD is a specialized IHM software provider that focuses primarily on delivering a straightforward, cloud-based platform for IHM Part I maintenance and SDoC/MD management. The platform is designed for simplicity and ease of use, making it accessible for smaller fleet operators who need a dedicated IHM solution without the complexity of a broader maritime management suite.
SDSD supports multiple class societies and offers multi-fleet management capabilities, allowing operators to manage compliance across vessels from a single dashboard. The platform's per-vessel pricing model provides transparency and scalability. However, SDSD does not currently offer automated regulatory updates, IHM Part II and III tracking, or integration with ESG, LCA, or procurement systems. Real-time reporting and API integration capabilities are limited compared to more feature-rich alternatives.
For organizations whose primary need is straightforward IHM Part I maintenance and document management, SDSD represents a focused and cost-effective option. Fleet operators with expanding compliance requirements, particularly around sustainability reporting and circular economy obligations, may eventually need to supplement SDSD with additional platforms.
Mastex MXSuite is an IHM maintenance module that forms part of the broader Mastex ship management software ecosystem. The platform provides IHM Part I maintenance and SDoC/MD management capabilities integrated within a wider vessel management framework. This makes MXSuite a practical choice for operators already using the Mastex suite for planned maintenance, safety management, or other operational functions.
MXSuite supports multi-fleet management and works with multiple class societies, providing the core compliance tools needed for HKC and EUSRR requirements. The per-vessel pricing aligns with the broader Mastex licensing model. However, the platform does not extend to IHM Part II and III, lacks automated regulatory updates, and does not offer integration with ESG reporting, LCA, circular economy, or training platforms. Mobile responsiveness and real-time reporting features are limited compared to cloud-native alternatives.
Mastex MXSuite is best suited for operators who value having IHM compliance within their existing ship management software ecosystem. For organizations requiring standalone IHM capability or a more comprehensive compliance platform, other options may provide broader functionality.
MarineMechanics offers a web-based platform focused on IHM Part I maintenance. The solution provides the fundamental tools needed for managing hazardous material inventories and SDoC/MD documentation in compliance with international regulations. Its cloud-based architecture ensures accessibility from any location with an internet connection.
The platform supports class society approvals and provides basic compliance tracking for individual vessels. MarineMechanics follows a per-vessel pricing model, making it accessible for smaller operators. However, the platform offers limited multi-fleet management capabilities and does not currently provide real-time reporting, API integration, or automated regulatory updates. Mobile responsiveness is limited, and there is no integration with ESG, LCA, circular economy, or procurement systems.
MarineMechanics is best positioned for smaller operators or single-vessel owners who need a basic, web-based IHM Part I maintenance tool at an affordable price point. Operators with larger fleets or more complex compliance requirements across multiple regulatory frameworks will likely need a more feature-rich solution.
Four key differentiators that make VSIMS the most comprehensive IHM maintenance and maritime compliance platform available today.
The only platform covering IHM maintenance, ESG reporting, Life Cycle Assessment, Computer Based Training, and Marine Procurement in a single integrated ecosystem.
Trusted by over 500 vessels worldwide across 50+ partners, including leading names such as Hapag-Lloyd, Synergy Group, Bernhard Schulte, and Swire Shipping.
Blockchain-based circular economy tracking provides verifiable, immutable records of hazardous material flows from vessel operation through end-of-life recycling.
Headquartered in the Netherlands with offices and partners across multiple continents, ensuring local support and compliance expertise wherever your fleet operates.
Discover how the most comprehensive IHM maintenance platform can simplify compliance across your entire fleet.