In short - The best replenishment software

Managing stock doesn’t have to be a guessing game. The right software calculates when and what to reorder, forecasts demand, and in many cases automates purchasing altogether. Below is a snapshot of the top solutions and who they’re best suited for.

• Optiply: Best for e-commerce, retail, and wholesale companies that want to fully automate replenishment.
• Relex Solutions: Best for large retailers and grocery chains with complex supply chains that need end-to-end optimisation.
• Eazystock: Best for mid-sized distributors, wholesalers, and manufacturers seeking ERP add-on functionality for inventory planning but willing to handle manual adjustments.
• Prediko: Best for Shopify-based DTC brands looking for fast, simple inventory planning.
• Fabrikator: Best for small to mid-sized Shopify sellers looking for lightweight forecasting and purchase order workflows without added complexity.‍
• Inventory Planner (by Sage): Best for smaller e-commerce and multichannel retailers that want straightforward forecasting but don’t mind managing much of the planning manually.

1. Optiply: 100% automated replenishment

Optiply, that’s us indeed, is an AI-powered replenishment platform designed for fast-moving e-commerce, retail, and wholesale businesses. Unlike traditional planning tools that provide forecasts but leave execution up to you, Optiply takes it further by fully automating the entire replenishment process. It continuously analyses sales data, supplier performance, and external factors (such as lead times, promotions, and pricing changes) to generate accurate purchasing suggestions. 

Instead of spending hours managing exceptions or updating spreadsheets, your team can trust Optiply to handle the heavy lifting, ensuring optimal stock levels every day.

Key features:

• Dynamic purchasing calendar to continuously optimise order timing and size
• AI-driven demand forecasting using millions of data points
• ABC-XYZ product categorisation to increase service levels and focus on the most profitable SKUs
• Multi-supplier matching based on price, delivery, and availability
• Purchase order automation (EDI, supplier portals, or email)‍
• Integrations with ERP, WMS, and e-commerce platforms

Main target audience: Companies managing large assortments and frequent purchases that want to free up their teams by automating daily replenishment.

Martijn Janssen, Purchaser and Sales Manager at Fitwinkel about Optiply:

“The fact that Optiply makes the calculations, analyses the sales of recent years and can therefore make a prediction – that saves so much work for me. The time-saving aspect is really the trigger. And it is also a lot less error-prone than our old way of working.”

2. Relex Solutions: Retail and Supply Chain Optimization

Relex Solutions is an enterprise-grade platform designed for large retailers, grocers, and supply chain-driven businesses. It focuses on end-to-end retail planning, covering forecasting, replenishment, assortment, promotions, and workforce planning.

Unlike lighter tools aimed at SMEs, Relex is built for scale and complexity, helping organisations manage thousands of SKUs across multiple stores, warehouses, and regions. 

Its strength lies in advanced forecasting and optimisation, but implementations can be lengthy and resource-intensive. For companies that don’t have highly complex operations, the platform may feel oversized and less agile than more modern, automation-first solutions.

Key features:

• Advanced demand forecasting with seasonality and promotions
• Automated replenishment across stores and distribution centres
• Supply chain optimisation and scenario modelling
• Assortment and space planning
• Workforce and promotion planning modules
• Integrations with enterprise ERP and retail systems

Main target audience: Large retailers, grocers, and enterprises with complex supply chains that need end-to-end optimisation across forecasting, replenishment, and planning.

3. EazyStock: ERP-driven inventory optimization

EazyStock is an inventory optimisation tool designed to work alongside ERP systems. It helps companies calculate inventory levels, set reorder points, and identify potential stock issues before they escalate. The platform is particularly relevant for manufacturers, wholesalers, and distributors with established ERP-driven processes. 

EazyStock highlights inventory problems but doesn’t fully resolve them, which means teams still need to take manual action. Users also report that it feels more traditional compared to newer solutions, with relatively limited support and flexibility for fast-scaling businesses.

Key features:

• Automated demand forecasting with seasonality adjustments
• Safety stock and reorder point automation
• Inventory classification and grouping
• Purchase order automation
• Supplier lead time tracking
• ERP integrations with Microsoft Dynamics, NetSuite, and more

Main target audience Mid-sized distributors, wholesalers, and manufacturers seeking ERP add-on functionality for inventory planning and basic replenishment automation.

4. Prediko: Inventory Management and Planning for Shopify

Prediko is a Shopify-native tool designed for direct-to-consumer (DTC) brands. It gives fast-growing Shopify merchants real-time inventory visibility and helps align purchasing decisions with marketing campaigns, product launches, and seasonal sales.

Unlike traditional tools built for complex supply chains, Prediko emphasizes speed, simplicity, and marketing alignment. It’s great for smaller teams that need a plug-and-play solution but may feel limited for larger businesses with more complex assortments.

Key features:

• AI-powered sales forecasting and demand planning 
• Purchasing plans tailored to campaign goals
• Real-time inventory tracking
• Automated reorder and stock-out alerts
• Supplier and order management
• Real-time inventory health dashboard
• Shopify-native setup

Main target audience: DTC Shopify brands that want a quick, easy way to connect marketing plans with purchasing decisions.

5. Manufacturer: Inventory management software for Shopify

Fabrikator is another Shopify-native replenishment tool but aimed at smaller to mid-sized merchants who want lightweight inventory planning without complexity. It helps sellers forecast based on sales velocity, manage suppliers, and set alerts for low stock.

Fabrikator is more focused on simple workflows and essential features. It lacks multi-channel support and focuses heavily on inventory forecasting, replenishment automation, and purchase order workflows for Shopify-focused businesses. 

Key features:

• AI-driven demand forecasting at the SKU level
• Purchase order creation and management
• Low stock alerts and notifications
• Backorder management 
• Collaborative inventory planning with marketing calendars
• Supplier management basics
• Shopify-native integration

Main target audience: Shopify sellers who want straightforward, affordable inventory planning to avoid stockouts and overstocks.

6. Inventory Planner: Forecasting and replenishment planning

Inventory Planner (now part of Sage) is a forecasting and replenishment tool aimed at smaller e-commerce and multichannel retailers. It consolidates sales data from platforms like Shopify, WooCommerce, and Amazon, giving businesses visibility into upcoming stock needs and purchase order suggestions.

Since its acquisition by Sage, Inventory Planner has become part of a broader finance and operations ecosystem. It focuses on providing forecasts for the next set number of days, leaving purchasing teams to decide on planning themselves. 

It’s useful for straightforward assortments but lacks advanced buffer stock calculations. Therefore, business have to factor in safety stock to avoid stockouts. As a result, it works well for smaller retailers but can quickly become restrictive as operations grow in complexity.

Key features:

• Forecasting based on historical sales
• Replenishment and purchase order suggestions
• Multi-channel sales data consolidation
• Kit and bundle forecasting
• Seasonal demand adjustments
• Integrations with Shopify, WooCommerce, Amazon, and more

Main target audience: Small to mid-sized retailers looking for simple forecasting across multiple sales channels, but willing to handle most of the planning manually.

Key features to look for in replenishment software

Now you know what each tool has to offer, you might still not be sure what the best option is for your business. Let’s look at some key features to consider when selecting software.

Automated replenishment workflows

Automatic replenishment is an important part of inventory management, where stock levels are monitored and automatically reordered to have the right amount of inventory. 

The strongest tools don’t just recommend what to order, they also automate the purchasing process. By generating and even sending purchase orders automatically, your team saves hours of manual work and reduces errors.

Automated reorder point calculations

Instead of relying on fixed rules or manual checks, modern replenishment tools calculate reorder points dynamically. They factor in lead times, safety stock, and current demand patterns, so you always know the exact moment to place a new order and avoid costly stockouts or excess inventory.

Demand forecasting and predictive analytics

Modern tools use AI-driven forecasting, which considers not just historical data, but also seasonality, promotions, and supplier variability. That way, you can prepare for demand shifts with confidence.

By combining different types of data sources you know exactly what supplier is best for every product, while taking into account price, lead time, availability and the purchasing agenda. Just like KoopjesDrogisterij does with Optiply:

"Three buyers used to spend almost their full days placing orders. Now that 94% of the process is automated, one person can handle it all. Our team has transformed from a purchasing department into a data-driven team."

ERP, WMS, and e-commerce integrations

Replenishment decisions are only as good as the data behind them. Tight integrations with your ERP, warehouse management system, and e-commerce platforms ensure you’re working with real-time, accurate information across channels and suppliers.

Supplier and EDI integrations

For businesses with frequent purchasing or multiple suppliers, EDI (electronic data interchange) integrations are a game changer. They allow purchase orders to be sent automatically to suppliers, closing the loop between planning and execution.

Ease of use and scalability

The best tools combine powerful automation with a simple interface. They scale easily with new products, warehouses, and suppliers, without adding complexity for your team.

Benefits of using inventory replenishment software

Replenishment software doesn’t just make life easier for purchasing teams, it directly impacts profitability and customer satisfaction. Let’s have a look at the benefits that justify the software investment. Because pricing is often just a fraction of the cost of stock-outs or excess inventory.

• Reduce costly stockouts and overstocks: An overflowing warehouse locks up cash, while not enough stock leads to abandoned shopping carts and lost sales. Replenishment software is the solution and results in a healthier cash flow.
• Save time on manual purchasing tasks: Automated forecasts and purchase order suggestions eliminate the need to manually check spreadsheets or guess what to order. Teams typically save up to 80% of their time, freeing them up to focus on strategic decisions and growth.
• Free up working capital and improve cash flow: By ordering smarter, businesses avoid tying up money in excess stock. This capital can then be reinvested into marketing, new products, or expansion, leading to growth instead of gathering dust on the shelves.
• Improve purchasing accuracy with AI-driven insights: Advanced forecasting takes seasonality, lead times, and sales velocity into account. Instead of relying on gut feeling, teams make data-backed purchasing decisions that reduce risk.
• Boost customer satisfaction with better availability: Consistent stock availability means fewer disappointed customers, fewer abandoned carts, and higher repeat purchase rates, turning inventory management into a growth driver.

It’s one thing to talk about the benefits, but actual users of replenishment software can show the real results. Just like Randy Hatzmann, Operational Manager at Mastertools:

"What used to take a whole day now takes our buyers 15 mins, thanks to automating 92% of our process, whilst we’ve also cut our backorders in half and saved 20% on inventory."

Why Optiply is your best choice to automate and optimise replenishment

At Optiply, we believe purchasing shouldn’t be based on gut feeling. Our AI-powered replenishment platform fully automates the process, so you can reduce errors, free up time, and keep the right products in stock, always.

With Optiply, businesses achieve:

• 80% less time spent on purchasing tasks
• 30% less excess inventory
• Fewer stockouts and happier customers
• Scalable automation that adapts to assortments, campaigns, seasonality, warehouses, and suppliers

Today, over 500 e-commerce, retail, and wholesale companies use Optiply to automate replenishment. Curious to understand how it works? Our software turns all your data into automated, optimal replenishment orders. This could be done weekly, daily, or even hourly during seasonal peaks for example.

Schedule a free demo and learn how to fully automate your replenishment in 15 minutes, or calculate in less than 1 minute how much you can save by making smarter purchasing decisions.