Plex Systems API
Plex Connect is a REST/JSON API with OAuth 2.0 service accounts covering orders, shipments, inventory, BOMs, and work orders; a legacy SOAP DataSource catalog covers thousands more screens. Access is customer-only, with credentials and sandboxes provisioned through account management.
Frequently asked questions
Plex Systems scores C on the API Report Card. Plex Connect is a REST/JSON API with OAuth 2.0 service accounts covering orders, shipments, inventory, BOMs, and work orders; a legacy SOAP DataSource catalog covers thousands more screens. Access is customer-only, with credentials and sandboxes provisioned through account management.
Plex Systems has an official API, but teams routinely hit its limits: gated access, partial coverage, or paid tiers. Most end up supplementing it with exports or an unofficial API layer like Supergood.
Plex Systems, headquartered in Troy, Michigan, sells the Plex Smart Manufacturing Platform, a cloud-native, multi-tenant suite that combines Manufacturing Execution System (MES), Enterprise Resource Planning (ERP), Quality Management System (QMS), Supply Chain Planning (SCP / Plex DemandCaster), Asset Performance Management (APM), Production Monitoring, MES Automation & Orchestration, Connected Worker, and Finite Scheduler modules into a single shop-floor-to-top-floor platform.
Primary vertical: Enterprise / HR / ERP, specifically cloud manufacturing ERP+MES for discrete and mixed-mode manufacturers. A Tier 1 automotive supplier runs Plex MES on the shop floor to collect machine data, track WIP, manage operator clock-ins, enforce quality checks, and print compliance labels; the same platform handles BOM management, MRP, scheduling, AR/AP, GL, and EDI to OEM customers (810/856/862/866 transactions).
Medium-high within North American discrete manufacturing.
Plex runs the most operationally critical workflows in a manufacturing plant: shop-floor MES transactions (operator clock-ins, machine cycles, scrap reporting, container labels), MRP runs and production schedules, work order release and completion, real-time inventory and WIP positions, quality inspection results and SPC charts, BOM and routing master data, AR/AP and GL postings, EDI 810/856/862/866 flow to OEM customers (a missed ASN to GM or Ford can trigger chargebacks within hours), just-in-sequence (JIS) parts shipments timed to OEM assembly lines, traceability and recall data for regulated industries (A&D, food & beverage), and shipment/label printing for outbound logistics.
Plex Systems was founded in 1995 (originally as Plexus Systems) and rebuilt as a true multi-tenant SaaS in 2001, one of the first cloud-native manufacturing ERPs, predating NetSuite Manufacturing and Salesforce.
Grades measure one thing: can a customer's engineering team get their own data out programmatically? We check six things (whether a real API exists, how access is gated, data coverage, auth quality, docs and developer experience, and stability) and roll them into a letter grade. Grades get re-verified, and they only move on evidence.
Yes. Supergood maintains an unofficial Plex Systems API and MCP server so AI agents and internal tools can read and write Plex Systems data. See the Plex Systems integration docs at supergood.ai/docs/plex-systems-api.