Simplified PHA Management with Clear Pricing, Easy Access & Legacy Study Migration

Kenexis® Open-PHA® redefines Process Hazard Analysis (PHA) software by addressing the frustrations common with competitive products, such as hidden fees, high costs, and restrictive licensing. Unlike other platforms, Kenexis® Open-PHA® offers a transparent pricing structure, with a free desktop version for unlimited use and a premium cloud platform at a fraction of the cost of competitors. Its flexible licensing eliminates barriers to collaboration, allowing multiple users to access and work on studies without extra charges or complications. Kenexis® Open-PHA® also empowers users to maintain full control over their data with exportable, non-proprietary formats, ensuring seamless integration with other tools and no vendor lock-in. Designed by engineers for engineers, Kenexis® Open-PHA® delivers unmatched value and user-friendliness, making it the smart choice for organizations looking for efficiency and cost-effectiveness in PHA, HAZOP, and LOPA studies.

Open-PHA®

Since we launched Kenexis® Open-PHA® HAZOP and LOPA software, thousands of users worldwide have made the switch. Our software solves some complicated problems that other PHA software providers have ignored.

Deliberately Different

First, our comprehensive, cloud-based software includes a free desktop version suitable for remote HAZOP and LOPA workshops with limited internet access, but capable of fulfilling most PHA documentation requirements. While the desktop version functions independently as a scaled-down solution, it seamlessly complements the cloud-based version, allowing users to leverage advanced features.

Second, unlike other PHA software, Kenexis® Open-PHA® employs a unique and adaptable data structure, facilitating effortless integration with various tools. This feature enables the creation of dashboards and customized reports.

Third, both the Kenexis® Open-PHA® Cloud and Desktop versions remain up to date automatically at no additional cost. The annual subscription for Kenexis® Open-PHA® Cloud includes free revisions, upgrades and training.

Finally, due to its unique design, Kenexis® Open-PHA® doesn’t restrict your HAZOP and LOPA study data in a cumbersome format. You can easily export your study data for use in other applications.

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Kenexis® Open-PHA® screenshot PHA Worksheets

Kenexis® Open-PHA® Desktop

Kenexis® Open-PHA® Desktop is a comprehensive PHA, HAZOP and LOPA software solution available for free download and use on Windows, Mac, and Linux computers.  Storing files locally on your computer, Kenexis® Open-PHA® Desktop enables offline work in remote areas without an internet connection, making it suitable for small shops or budget-conscious contractors. If you decide to transition to the cloud version in the future, the upgrade process is straightforward, unlocking the benefits of cloud-based storage and advanced features offered in Kenexis® Open-PHA® Cloud.

Kenexis® Open-PHA® Safeguards

Kenexis® Open-PHA® Cloud

Kenexis® Open-PHA® Cloud utilizes internet-based computing and artificial intelligence to enhance its capabilities. Additional features not only improve the software but also facilitate access with other Kenexis software tools. This includes synchronizing safety instrumented functions from Open-PHA® Cloud to our Kenexis® SIS (formerly Vertigo™) SIS Lifecycle Management tool and exporting PHA scenarios to Kenexis® Bowtie providing an industry-leading unified solution.

Built for AI. Kenexis® Open-PHA® was designed around an open, text-based JSON format from the ground up — not a proprietary binary file. Because your studies are structured data, an AI or LLM agent can read a full HAZOP or LOPA study, reason about its causes, consequences, safeguards, and recommendations, and write changes back. The cloud tier adds a full REST API (available as a separate purchase) so your studies feed risk registers, work-management systems, maintenance and inspection programs, and BI dashboards — answering the question most PHA tools ignore: what happens to the study data after the study is done? With most tools the answer is ‘it sits in a PDF nobody reads until the next revalidation.’ With Kenexis® Open-PHA® it becomes a live enterprise asset. The same open format also lets us build AI-assisted migration agents that import your legacy studies — dramatically lowering the cost of switching.

Stop losing days to report assembly. Post-study report assembly is the largest single time sink in the PHA workflow — for a typical study, two to five days of copying data into Word, formatting it to a report template, building tables of contents, and cross-referencing recommendations. Kenexis® Open-PHA® Cloud generates the entire report directly from your own template in a few clicks: narrative sections, study tables, recommendation and action-item lists, and appendices. Days of work become minutes of review. A facilitator running ten studies a year who saves three days per study reclaims roughly a month of working time annually — the single most tangible reason customers move from the free desktop version to the cloud tier.

Kenexis® Open-PHA® Cloud is built to conform with ISO/IEC 27001 and hosted on Microsoft Azure, with encryption in transit and at rest, role-based access controls, per-tenant data isolation, and audit logging — so it stands up to the IT and OT-security review that gates enterprise deals. For accounts that cannot accept a cloud deployment, the free desktop version keeps all data local. Beyond security, the cloud platform adds advanced features such as controlled storage, sharing, and seamless integration with other Kenexis tools. The storage and sharing capabilities go beyond a simple file storage system. Our secure cloud platform enables controlled access for editing or viewing files at specific sites, corporate levels, and even with third parties. This eliminates the need for emailing files and ensures consistent version control throughout the lifecycle. This becomes particularly crucial when sharing files outside your organization, such as with contract engineering firms.

Configure User Access screenshot

Built for the five-year revalidation

OSHA PSM and equivalent regulations require facilities to revalidate their PHAs every five years. Teams working in Excel rediscover that the prior study is effectively a static document — there is no clean way to flag what changed, carry forward recommendations, or update only the affected nodes. Open-PHA holds the study as a living dataset with revision management built in, so a revalidation that drags on for weeks in spreadsheets can be cut substantially: the structure, nodes, and prior recommendations are already in place and simply need updating.

Designed by Engineers for Engineers

Kenexis® Open-PHA® offers support for tailored Templates, Reporting, Risk Matrix, Likelihood Categories, Consequence Categories, Risk Rankings, Nodes, Deviations, HAZOP & LOPA Worksheets, Recommendations, Safeguards, a Parking Lot, and Checklist.

Kenexis® Open-PHA® offers customizable views without modifying the underlying data structure. This approach provides flexibility in how forms are displayed while ensuring customizations don’t disrupt higher-level reporting and data collection due to incompatible file structures.  Kenexis® Open-PHA® also supports both explicit and less common implicit LOPA. In Explicit LOPA, the team establishes a TMEL target based on consequence severity, defines explicit frequencies of cause, and applies frequency modifiers, such as conditional modifiers, enabling events, and probabilities of failure for IPLs. In implicit LOPA, the team operates with the concept of “LOPA credits.”

Adding value with flexibility and consistency

Kenexis® Open-PHA® employs a fully integrated data structure design using a consistent JSON data interchange format, revolutionizing PHA documentation. This design enables tools to present a single set of data in various formats like HAZOP worksheets, LOPA worksheets, or bow-tie diagrams. The days of struggling with data transfer and manipulation, and worrying about information consistency across multiple files, studies, or data structures are over. This approach allows data from multiple scenarios to be consolidated into more user-friendly hazard registers, visualized with graphical tools like bow-tie diagrams, eliminating the challenges of managing duplicated data across different locations and languages.

Kenexis® Open-PHA® Desktop & Cloud features include:

Migrating PHA Studies to Kenexis® Open-PHA®

We understand that transitioning your PHA studies from other software, including spreadsheets, to secure cloud-based solutions may seem overwhelming and time-consuming. Let us streamline this process by collaborating with you to develop a data migration tool. With this tool, you can effortlessly transfer your PHA studies into Kenexis® Open-PHA®, enabling you to utilize our unified hazard assessment data structure for SIL Verification, Fault-tree Analysis, Quantitative Bowtie Analysis, and SIS Life Cycle Management. Alternatively, if you prefer, we can handle the entire migration process for you at a reasonable cost.

Given that HAZOP and LOPA studies form the cornerstone of process safety documentation, we recognize the importance of easily sharing information across common applications and platforms. Kenexis® Open-PHA® was designed to facilitate the extraction of data from HAZOP and LOPA studies for use in custom software tools, enabling comprehensive analysis and tailored reporting. This approach represents a significant departure from traditional PHA software, where unwieldy file structures have typically restricted third-party access to your data and discourage the use of alternative software tools.

We are committed to assisting you in transitioning from your existing PHA software to Kenexis® Open-PHA® and will provide comprehensive training to ensure a smooth transition process.

Top 5 Reasons to Use Kenexis® Open-PHA®

Video Demonstration

Below is a comprehensive video demonstrating our Kenexis® Open-PHA® HAZOP and LOPA software.  This video highlights the capabilities, benefits, and unique licensing of both the free desktop version and the premium cloud version.

Desktop Download

There is NO CHARGE for Kenexis® Open-PHA® Desktop. Just download it using the link below. System requirements are minimal – Kenexis® Open-PHA® Desktop runs on Mac, Linux, or Windows.

Click here to get started today with Kenexis® Open-PHA® Desktop for free!

Trial Request

System requirements – requires a browser on Mac, Linux, or Windows platform.

Click here to request a free 30-day evaluation of Kenexis® Open-PHA® Cloud

Pricing

Kenexis® Open-PHA® Cloud runs in a browser to take advantage of additional cloud-based computing functions to add capabilities that enhance HAZOP and LOPA studies performed in Open-PHA® Desktop. A single concurrent-user license is $2,300 USD/year*.

*Prices shown apply to the United States, Canada and Europe.  Prices in other regions may vary.

Visit our online store to buy now or explore Process Safety Software Bundle pricing.  If needed, please contact Kenexis for a proposal.

FAQs

Even though each version can be used independently, they are designed to work together.

The Kenexis® Open-PHA® Desktop version is a standalone desktop application, which stores files locally on your computer without the need for an internet connection to facilitate work in remote areas.

The licensed Kenexis® Open-PHA® Cloud version of the software runs in a browser and is designed to work with the Desktop versions to provide additional benefits when the user returns to a location where they can access the internet.

Kenexis® Open-PHA® Desktop & Cloud features include:

  • Configurable HAZOP and LOPA Worksheets
  • Configurable Risk Criteria
  • Recommendation Tracking
  • Deep Copy & Paste
  • Search & Replace
  • Implicit & Explicit LOPA Support
  • Cross-Platform Support (Windows/Mac/Linux)

Kenexis® Open-PHA® Cloud added features:

  • Requires Internet Connection
  • Study / Facility Dashboard
  • Revision Manager
  • Integration with Vertigo SIS Lifecycle Management
  • One Click Report Generating from Custom *.DOCX Template
  • Study Content Translation
  • Bowtie Generation
  • Share and Collaborate with Project Teams

Putting the software through its paces can be done very easily, at no cost.

You simply need to go to the Kenexis® Open-PHA® software page on our web site and download Kenexis® Open-PHA® Desktop version of the software at no cost.

You can also request a 30-day trial license of Kenexis® Open-PHA® Cloud on the same page.

Yes, both versions of Kenexis® Open-PHA® are updated frequently and actively maintained.  Our software is developed using a CI/CD process meaning updates come more frequently that with legacy desktop software.

Kenexis® Open-PHA® Cloud will always be up to date as it is a web application.

Kenexis® Open-PHA® Desktop will check for updates when you open the application if you are connected to the internet.  If an update is found it will download it in the background and install the update the next time Kenexis® Open-PHA® is closed.

There is no end-of-life plan for Kenexis® Open-PHA®.

We are actively introducing new features.

In Kenexis® Open-PHA® Cloud, licensing is done under a concurrent user licensing model.

Concurrent licensing allows any number of users access to the software simultaneously up to the number of concurrent user licenses that you purchase.

Unlicensed, view-only access is free and unlimited. You set up a user account or invite a user for anyone who you would like to have view-only access.

Concurrent user model only applies to users who need editor privileges.

While each version can be used independently, both Kenexis® Open-PHA® Desktop and Cloud version are designed to work together as a single workflow.

Kenexis® Open-PHA® Desktop provides the core functionality needed during a facilitation session or at a remote site, without requiring an internet connection.

Kenexis® Open-PHA® Cloud adds features available only through the Kenexis Integrated Safety Suite, including premium reporting tools, a dashboard, integration with SIS Lifecycle Management software, revision management, and bowtie diagram generation.

The intended workflow is to use Kenexis® Open-PHA® Desktop during facilitation sessions, where internet access may be unreliable or unavailable, and then upload the study to Kenexis® Open-PHA® Cloud once you’re back in the office with a reliable connection. From there, you can finalize the study and generate reports. Read-only access to Kenexis® Open-PHA® Cloud is free of charge, so you can easily share your studies with colleagues and clients without concern about unauthorized modification or deletion. This is how our engineers at Kenexis use the software, and we believe it reflects how most of our users work with it as well.

To move studies between the desktop and cloud versions, use the study import/export tool described in Section 3.2.3 of the Kenexis Integrated Safety Suite Project Manager User’s Manual, available at the following link.

https://www.kenexis.com/support-post/kiss-project-manager-users-manual/

Additionally, if you are revalidating an existing study, you can “import and a working revision” from the premium tools menu in Kenexis® Open-PHA® cloud.  This overwrites the currently working revision of a study as described in Section 5.5 of the Kenexis® Open-PHA® User’s Manual at the following link.

https://www.kenexis.com/support-post/open-pha-users-manual/

No, our software is not tied to Excel or Microsoft in any way.  In fact, Kenexis® Open-PHA® Desktop is cross-platform. It runs on Mac and Linux as well.

Kenexis® Open-PHA® Desktop and Cloud are integrated HAZOP and LOPA software used to record HAZOP and LOPA to determine SIL requirements in accordance with IEC 61511.  However, Kenexis® Open-PHA® alone does not provide all of the functionality required to comply with IEC 61511.  Kenexis® Open-PHA® Cloud is integrated with our SIS Lifecycle Management software Kenexis® SIS (formerly Vertigo™).

While Kenexis® Open-PHA® Desktop can be used for SIL determination, Kenexis® SIS (formerly Vertigo™) can be used to perform the remaining SIS Lifecycle tasks like SIL Verification, SRS Development and bypass/testing tracking during the operational phases of the lifecycle.  Our Kenexis® SIS (formerly Vertigo™) software is built around and implements the recommended practices from ISA on implementation of the IEC/ISA 61511 standard.

Our platform can provide the functionality you have described.

Kenexis® Open-PHA® software provides the HAZOP, LOPA and SIL determination functionality.

In addition, Kenexis® Open-PHA® Cloud is integrated with our Vertigo SIS Lifecycle Management software. Kenexis® SIS (formerly Vertigo™) software extends the functionality of Kenexis® Open-PHA® Cloud to allow you to perform SIL Verification calculations, develop Safety Requirement Specifications and track the performance of a Safety Instrumented System through the life of the system.

Kenexis® Open-PHA® supports translations to languages automatically. This is done by looking at the default language for your operating system or your web browser.

There is not a way for the user to manually change the language.

Currently we have support for three languages: English, Chinese and Portuguese.

We support Chinese and Portuguese because there is high demand for our software in China and Brazil where many users do not speak English as a second language.

If you have another language needed, please let us know using the Contact section at the bottom of this page and we will try to accommodate.

You can share your desktop with others using any type of remote conferencing.
Kenexis® Open-PHA® Cloud, versus Kenexis® Open-PHA® Desktop, adds additional premium features listed below.
Kenexis® Open-PHA® Cloud added features:
  • Requires Internet Connection
  • Study / Facility Dashboard
  • Revision Manager
  • Integration with Vertigo SIS Lifecycle Management
  • One Click Report Generating from Custom *.DOCX Template
  • Study Content Translation
  • Bowtie Generation
  • Share and Collaborate with Project Teams

The last item “Share and Collaborate with Project Teams” is designed to facilitate corporate settings where multiple people want to review and alter findings, recommendations, etc.

If you use Kenexis® Open-PHA® Cloud for a meeting, you still share your desktop via the web conferencing tool you use like Microsoft Teams or Zoom. But, you will be sharing a browser session requiring an Internet connection the entire time.
We suggest you use Kenexis® Open-PHA® Desktop for the actual PHA facilitation and recording, that is why it was created as a no-cost download. Then later if you want the added features, you can upgrade to Kenexis® Open-PHA® Cloud for the added features.

Both the Desktop and Cloud versions of Kenexis® Open-PHA® allow you to customize the risk matrix and risk criteria for your study.  Kenexis® Open-PHA® supports 5 risk ranking categories (safety, environment, asset, community, and reputation).  Each category can be customized as needed.  You can learn more about how to customize the risk criteria at the video link below.

Using Kenexis® Open-PHA® – Section 4.1 – Risk Criteria Overview – YouTube

Using Kenexis® Open-PHA® – Section 4.2 – Likelihood Categories – YouTube

Using Kenexis® Open-PHA® – Section 4.3 – Consequence Categories – YouTube

Using Kenexis® Open-PHA® – Section 4.4 – Risk Rankings – YouTube

Using Kenexis® Open-PHA® – Section 4.5 – Risk Matrix – YouTube

Kenexis® Open-PHA® can calculate risk ranking before safeguards, after safeguards, and after recommendations.  In the PHA (HAZOP) Worksheet, the is done the traditional (qualitative) way, where the likelihood is based on the judgment of the PHA team.  Kenexis® Open-PHA® is an integrated PHA/LOPA application which means that for each PHA scenario, you can also have a linked LOPA scenario.  If a PHA scenario is marked as requiring LOPA on the PHA Worksheet it will then appear on the LOPA Worksheet where the scenario can be analyzed quantitatively, considering the frequency of the cause and probability of failure for each safeguard/IPL.

Kenexis® Open-PHA® does not currently support sending email to owners of action items.

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