Sentry WMS

Overview

Sentry WMS is a free, open-source warehouse management system for e-commerce fulfillment teams able to run their own software. It is strongest as an execution layer alongside an existing order, product, and customer system—not as a standalone business platform. Its price removes a software fee, but self-hosting and connector work are part of the decision.

Key features

Sentry covers receiving, storage, picking, packing, shipping, and counting. Its Pick Walk feature batches multiple orders and optimizes the walking route, which can help teams reduce backtracking while fulfilling several orders in one pass. Batch picking is a focused strength for warehouse execution, rather than a broad promise to manage the rest of the commerce operation.

Inventory controls include bin-level cycle counts, variance detection, and an administrator approval step. Transfers and adjustments are tracked, with a reason recorded for adjustments. Multi-warehouse support and barcode scanning extend the system beyond a basic stock ledger, though teams should confirm that its workflows match their own warehouse processes.

The connector framework offers scaffolding for ERP, commerce, and other HTTP API integrations, but Sentry does not ship first-party connectors for NetSuite, QuickBooks, Shopify, or BigCommerce. That makes it a more plausible fit for teams with integration capacity than for businesses expecting a ready-made connection to their current systems. Sentry also expects another system to manage orders, products, and customers; it is not an ERP.

The documented stack includes a React web admin panel, a React Native mobile app, a Flask API, and Docker Compose deployment. For production, the deployment guide calls for configured secrets and a reverse proxy to provide HTTPS in front of the HTTP-only API. It also documents an encrypted connector credential vault, a hash-chained audit log, a content security policy, and rate limiting. Connector controls include SSRF protection with DNS-rebinding safeguards; credentials are encrypted, not returned in plaintext through the API, and credential writes are logged. These controls address important deployment risks, but teams still need to operate the environment and configure it appropriately.

An Android deployment is documented through sideloading an APK and configuring it to connect to the operator's API server. That offers a mobile path without implying a managed app-store installation. Bulk CSV or JSON imports are capped at 5,000 records per import, a constraint to plan around when loading larger catalogs or datasets.

Pricing

Sentry WMS costs nothing. Its free, open-source plan is self-hosted, so the absence of a subscription price comes with responsibility for deployment and operation. There is no separate trial to weigh against a paid tier: the product is offered as a free plan.

The plan is a better fit for teams that can manage hosting and build the integrations they need than for buyers seeking packaged, vendor-connected warehouse software. The import ceiling of 5,000 records per CSV or JSON import matters during setup and bulk maintenance. The repository states that v1.7.0 and later use the Apache License 2.0; earlier tagged releases remain MIT-licensed, so teams should check which license applies to the release they adopt.

Platforms

Sentry supports web, Android, API, and self-hosted deployment. The web admin panel and mobile app are documented alongside the Flask API, with Docker Compose as the documented deployment method. Android requires sideloading and connection to the operator's API server, so organizations should be comfortable managing that installation path.

Who it's for

Sentry suits e-commerce fulfillment operations that already rely on a separate system for orders, products, and customers, and that want warehouse workflows for picking, inventory, and shipping without a software charge. It is especially relevant to teams that can self-host, handle API integration work, and operate their own Android deployment if needed.

It is a weaker fit for a business looking for an ERP, turnkey commerce connections, or a hosted service that removes deployment duties. Teams importing more than 5,000 records at once will also need to split those imports.

Pros and cons

• Pros: Free and open source, with self-hosted deployment, avoids a recurring software fee for teams able to run it themselves.
• Pros: Batch picking with route optimization, bin-level counts with variance review, and reason-tracked adjustments cover practical warehouse execution needs.
• Pros: Documented credential encryption, audit logging, SSRF protections, and production security measures give operators concrete controls to configure.
• Cons: No first-party ERP or commerce connectors means integrations require additional work.
• Cons: Self-hosting and HTTPS reverse-proxy setup put deployment and ongoing operation on the adopting team.
• Cons: Sentry does not manage orders, products, or customers, and imports are limited to 5,000 records per file operation.

Alternatives

For a broader shortlist, compare Order Fulfillment Software and Warehouse Management Software. Among the named options, OpenBoxes is worth considering when a self-managed warehouse system with a free community plan and unlimited users is a closer match; its shared-hosted plan is 75.00 US. Choose ShipBob if you are a ShipBob customer seeking its free software for ecommerce-store connections and inventory, order, and shipment management.

Anchanto Warehouse Management is another option for teams seeking a paid warehouse product, with demo and pricing by request. Vinculum Vin OMS may suit buyers considering a paid OMS, while Deck Commerce is another paid OMS option; both require a demo or pricing request. Extensiv 3PL Warehouse Manager is an alternative for buyers evaluating a paid 3PL warehouse manager with professional and enterprise subscriptions. Flowspace Order Management is a paid, quote-based alternative whose pricing is tailored to operational requirements.

Verdict

Choose Sentry WMS if your team needs free warehouse execution software, can self-host it, and has the capacity to connect it to an existing ERP or commerce system. Its practical picking and inventory controls are the strongest reason to adopt it. Look elsewhere if you need an ERP, ready-made integrations, or a deployment model that does not put hosting and setup on your team.