Inventory management/ order fulfilment/ with custom supplier

Shopify Apps

Topic summary

A merchant seeks an app to automate order fulfillment with custom suppliers (primarily startups manufacturing their own products) while synchronizing inventory across systems. Key requirements include automatic order routing to suppliers, real-time inventory updates at both shop and supplier locations, and ideally customer email notifications, invoice generation, and accounting software integration.

Multiple solutions have been proposed:

Specialized Apps:

  • Order Automator: Automates fulfillment and vendor notifications based on custom rules
  • Order Fulfillment Guru: Routes orders to suppliers with split-order handling directly in Shopify Admin
  • Duoplane: Comprehensive solution offering automatic order splitting, supplier routing, inventory syncing (via CSV/Google Sheets/EDI), and QuickBooks/Xero integration
  • Simple Purchase Orders: Generates purchase orders from customer orders and emails suppliers

Inventory Management Platforms:

  • Unleashed, Cin7, Dear: Full-featured systems commonly used for these workflows
  • Fabrikator: Supply planning with purchase order automation (enterprise plan)
  • Prediko: Custom solution for 3 of 5 requirements

Custom Development:

  • BundleSync and JoesIdeas offer tailored integrations depending on supplier systems and specific API capabilities

Note: One commenter warned against Order Fulfillment Guru due to alleged unethical practices by its developers. The discussion remains open with no final decision indicated.

Summarized with AI on November 2. AI used: claude-sonnet-4-5-20250929.
3

I work in this space and have some ideas to add:

The incoming order fulfils automatically and gets sent to the supplier accordingly
Order Automator app will do that - you can create rules to fulfill line items, also to send notifications if you want. So if a product comes in for Vendor A, then you can have it autofulfilled and send an email to that vendor.

My team built that so we can also customize if you need it (for example some of the points you mentioned below).

Inventory gets updated at the supplier and at my shop.
This will happen automatically on your shop. For “at your supplier”, it will depend what system they are using. If they just need a notification, then nothing additional needed. If they’re using software, the first step would be to see if their software allows API connection. If yes, you / we could write some code to update the inventory count on new orders within an app.

sending emails towards customer would be a plus
Shopify handles this automatically.

sending the invoice to the customer would be a plus
One idea, you could include the invoice in the order confirmation email. Or have an app send them an invoice (might be restricted to certain formats, for example, a csv would be easy but a PDF may be more difficult to generate from code).

any integration into accounting software would be a plus
Depends what the accounting software is. If they have an API then yes you can write code in an app to communicate with it when new orders come in.

Summary, anything’s doable, an existing app is your best solution but if you can’t find what you’re looking for and need a 100% custom app feel free to reach out, my team builds both public and private apps, we solve problems like this all the time.

Hope that helps.