The Tech Stack Decoded: ERP, PLM, OMS, WMS, 3PL
Five acronyms every inventory PM must understand cold: ERP, PLM, OMS, WMS, and 3PL. They describe the systems that manage products from design to delivery — and where Tightly plugs in.
ERP — Enterprise Resource Planning
An ERP is the central nervous system of a business: it connects finance, inventory, purchasing, HR, and operations into one data model. Every transaction — a purchase order, a sale, a warehouse receipt — is recorded here.
Key ERP players: SAP (large enterprise), Oracle NetSuite (mid-market), Microsoft Dynamics 365 (SMB to enterprise), Sage (SMB).
Why it matters for Tightly: Most brands at $10M+ GMV have or will adopt an ERP. Tightly must sync POs and inventory data with these systems. "ERP export" is in Tightly's integration list — meaning Tightly generates the plan, the ERP records the execution.
The gap Tightly fills: ERPs are systems of record — they track what happened. Tightly is a system of intelligence — it recommends what should happen next. These are complementary, not competing, roles.
Secure, owned space on the board. An ERP is a company's territory — it records what is definitively owned and transacted. Tightly plays in the adjacent open spaces: forecasting what territory you should claim next.
PLM, OMS, WMS — the other three
PLM (Product Lifecycle Management) — manages a product from concept to end-of-life: design files, BOM (bill of materials), specification sheets, supplier sourcing, certifications. PLM is upstream of inventory — it determines what gets made before inventory planning decides how much to stock. Brands rarely mention PLM to Tightly; it's more relevant in fashion and manufacturing.
OMS (Order Management System) — manages customer orders across all channels: Shopify storefront, Amazon, wholesale, POS. Routes orders to the right warehouse or 3PL. Tracks fulfillment status. When Tightly recommends a stock transfer between locations, it's interacting with the same data an OMS tracks. Extensiv (formerly Skubana) and Linnworks are OMS tools.
WMS (Warehouse Management System) — manages operations inside a warehouse: receiving, put-away, pick-pack-ship, cycle counts. Tracks exactly where each unit is in the building. When a PO is received, the WMS scans it in. Tightly's "Days of Stock" calculations depend on accurate WMS data. Canary7 is an example WMS that Tightly integrates with.
3PL — Third-Party Logistics
A 3PL is an outsourced logistics provider that handles warehousing, picking, packing, and shipping on behalf of a brand. Instead of running your own warehouse, you ship inventory to a 3PL and they fulfill orders for you.
Why brands use 3PLs: Asset-light growth — you don't own warehouse real estate. Geographic coverage — a 3PL can have locations in multiple regions. Expertise — 3PLs handle carrier relationships, customs, and compliance.
Tightly's 3PL integrations: byrd (Europe), Elite OPS, Flowspace, NLRP, Smart Warehousing (all US). This is critical: Tightly pulls live inventory counts from the 3PL's system so its Days of Stock calculations are accurate. If a 3PL isn't integrated, inventory data is stale.
PM implication: When a new customer onboards, their 3PL integration is on the critical path. If Tightly doesn't integrate with a customer's 3PL, the forecasting accuracy is limited. This is a known constraint on the ICP.
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