A note before you read: we make Posto, so we're not neutral. We've tried to be fair anyway. Every fact below comes from Inventory Planner's own Shopify App Store listing, checked on October 1, 2026, and we say plainly where Inventory Planner is the better choice.
The short version
Choose Inventory Planner if you sell across several channels and warehouses, want deep forecasting and cash flow planning, and are comfortable with a sales process and expert-led onboarding. Choose Posto if you sell on Shopify, buy from a handful of suppliers, and want public pricing you can set up yourself.
What it costs
- Inventory Planner: free to install, with pricing by quote. The listing says "Pricing adapts to your business needs. Contact us to get a quote," and that charges may be billed separately from your Shopify invoice.
- Posto: free for 1 supplier and 50 products, $19 a month for up to 5 suppliers, and $39 a month for unlimited, billed through Shopify. No sales call and no contract. 30-day free trial.
Where Inventory Planner is ahead
- Track record. Inventory Planner launched in 2013. Posto is new.
- Multi-channel. It works with Amazon and WooCommerce, not just Shopify, and integrates with Cin7, Linnworks, QuickBooks, and ShipBob.
- Planning depth. Multi-location planning, cash flow and inventory turnover planning, and a planning module that looks beyond your next purchase order.
- More tools. Barcodes, scanners, and automated stock orders and reports.
- Hands-on onboarding. The listing promises expert-led onboarding and support.
Where Posto goes further
- Public pricing. Posto's prices are on its pricing page. You don't need a quote, a call, or a contract.
- Billed through Shopify. Posto's charges appear on your Shopify invoice, monthly or yearly.
- A free plan and a 30-day trial, with every feature unlocked.
- Math you can check. Every recommendation shows its working: lead time, days of cover, safety stock, and what you already have.
- Simplicity. Posto does one job, reordering for Shopify stores, so there's less to set up and learn.
What they share
Both forecast demand, recommend what to reorder, create purchase orders, and send low-stock alerts.
Sources
Inventory Planner's Shopify App Store listing, checked October 1, 2026. Pricing is by quote, so contact Inventory Planner for current prices.