OpenMES

OpenMES is a web-based, open-source Manufacturing Execution System that links factory-floor activity with office operations. Its core features include real-time production monitoring, automatic OEE calculation, drag-and-drop Gantt scheduling, work orders, maintenance, and analytics. For traceability and quality, it supports LOT and serial-number tracking, inline quality control with SPC charts, and audit trails. It connects to IoT and SCADA equipment through OPC UA, MQTT, and Modbus. A REST API supports connections to ERP, CMMS, LIMS, and other systems, and listed integration modules include Wapro Mag and Subiekt NEXO PRO. The free Community plan is designed for single-site operations. Enterprise adds advanced reports, organizational structure, workforce tools, inspection workflows, advanced warehouse functions, and advanced BOM visualization. OpenMES can be self-hosted, while Enterprise deployments are offered on-premise or in cloud, with Docker or Kubernetes options. Documentation describes a progressive web app for iOS and Android tablets with offline work and automatic sync. The core is described as AGPL-3.0 and modules as AFL-3.0, with commercial licenses available for certain use cases. Community support uses documentation, issues, and discussions; Enterprise includes a named support engineer with guaranteed SLA response times.

OpenMES covers production scheduling, monitoring, quality, maintenance, and system connectivity, with a free single-site Community plan. Larger or regulated operations may need Enterprise for advanced modules and dedicated SLA support.

OpenMES is described as built for small and mid-sized manufacturers, with Enterprise aimed at large-scale, multi-site, and regulated operations. Its self-hosting, production tracking, and traceability functions may suit teams connecting shop-floor processes with office systems.

OpenMES is an open-source manufacturing execution system for manufacturers bringing factory-floor work and office operations together. It is best suited to small and mid-sized teams that want a broad, self-hostable system for one site. Its free Community plan covers substantial production, quality, and traceability needs, but Enterprise is the fit for advanced modules and guaranteed support.

Overview

OpenMES combines production monitoring, scheduling, work orders, maintenance, quality controls, and traceability in a web-based system. Automatic OEE calculation and real-time dashboards give teams visibility into production as it progresses; LOT and serial-number tracking and audit trails support accountability. The breadth of the free core is compelling for a single-site operation, though teams needing advanced reporting or workforce tools will have to move beyond Community.

The core is licensed under AGPL-3.0 and modules under AFL-3.0; commercial licenses are available for certain use cases. Daily usage reporting is enabled by default, excludes entered production and personal data, and can be disabled in settings or with OPENMES_TELEMETRY=false. Documented settings include role-based access control and two-factor login.

Key features

Production planning and visibility

Drag-and-drop Gantt scheduling, work orders, maintenance, analytics, real-time monitoring, and automatic OEE calculation bring planning and shop-floor performance into one system. This range should suit manufacturers seeking a shared operational view without paying for a Community subscription, although the plan is designed for a single site.

Quality, traceability, and connectivity

Inline quality control with SPC charts, audit trails, and LOT and serial-number traceability help teams follow product history and quality through production. OPC UA, MQTT, and Modbus connections link OpenMES to IoT and SCADA equipment, while a REST API supports connections to ERP, CMMS, LIMS, and other systems. Wapro Mag and Subiekt NEXO PRO integration modules are also listed. That combination makes the system relevant to factories with varied equipment and software, though integrations beyond those named depend on connecting through the API.

Mobile use and deployment

The progressive web app can be installed on iOS and Android tablets, with offline work and automatic sync documented. Self-hosting gives organizations control over deployment; Enterprise can be deployed on-premise or in the cloud, with Docker and Kubernetes options. The hosted subscription platform is still being explored, so teams looking for an established hosted subscription should not treat it as a current offering.

Pricing

Community has no subscription charge, but its single-site scope and lack of Enterprise modules are meaningful limits. Community support comes through documentation, existing issues, and discussions; Enterprise adds a named support engineer and guaranteed response times. Enterprise pricing is custom, so teams should weigh the additional capabilities and support against a quote rather than assume a fixed upgrade cost.

Platforms

OpenMES supports web, self-hosted, API, Android, and iOS. Tablet access through the progressive web app, including offline work and automatic synchronization, is useful for shop-floor teams that need mobile access when connectivity is interrupted.

Who it's for

OpenMES is a strong match for small and mid-sized manufacturers seeking production visibility, scheduling, work orders, quality control, and traceability in a free system they can self-host. It is less suitable for organizations that require multiple sites, advanced workforce or warehouse functions, or guaranteed support unless they are prepared to pursue Enterprise pricing. Its machine protocols and REST API also make it relevant to factories connecting production equipment and business systems.

Pros and cons

Pros

• Broad free core: Community includes a full MES experience for a single site, with scheduling, monitoring, work orders, maintenance, quality, and traceability.
• Factory connectivity: OPC UA, MQTT, and Modbus support links to IoT and SCADA equipment, while the REST API supports connections to business and quality systems.
• Useful tablet workflow: The progressive web app supports offline work and automatic sync on iOS and Android tablets.
• Self-hosting choice: Organizations can run OpenMES themselves, while Enterprise adds on-premise or cloud deployment options.

Cons

• Community is single-site: Its free scope may not suit manufacturers managing multiple locations.
• Advanced capabilities require Enterprise: Advanced reports, workforce tools, inspection workflows, warehouse functions, and BOM visualization are not part of the Community offering.
• Support differs by plan: Community relies on documentation, issues, and discussions rather than Enterprise's named engineer and guaranteed SLA response times.
• Telemetry is on by default: Daily usage reporting can be disabled, but organizations must change the setting if they do not want it enabled.

Alternatives

For a broader comparison set, see Manufacturing Execution Systems.

• iTAC.MOM.Suite is a paid option for readers who need its wider platform support, including Linux, macOS, and Windows alongside web, mobile, API, and self-hosted access.
• MIE Trak Pro is a paid alternative with quote-based pricing for readers willing to contact MIE Solutions for a price.
• NETVIBES is a paid alternative with a free plan and free trial for readers comparing options with those entry points.
• Critical Manufacturing MES is another paid MES option.
• GE Vernova Proficy Plant Applications suits readers considering a hosted or on-premises mix for process, discrete, and mixed manufacturing; its subscription price is custom.
• Leading2Lean Smart Manufacturing Platform is a paid alternative for readers willing to contact L2L for a consultation about pricing.
• Plex MES may suit readers who prefer one low annual subscription with unlimited users and machines, no overage charges, and no data-transfer limit; pricing is custom.
• ABB Manufacturing Execution System is a paid alternative for readers seeking pricing and purchase information by inquiry.

Verdict

Choose OpenMES if your small or mid-sized manufacturing operation needs a capable, self-hostable MES for one site without a subscription fee. Its strongest case is the breadth of production, quality, traceability, and connectivity in Community. Look elsewhere or budget for Enterprise if multi-site scope, advanced modules, or guaranteed SLA support are essential.