ReplenishRadar vs SoStocked: Amazon-Only Forecasting vs Unified Multi-Channel Planning

SoStocked is built primarily for Amazon sellers. It was acquired by Carbon6, which was then acquired by SPS Commerce in January 2025 for $210 million. The product is still active under the Carbon6 brand. ReplenishRadar is built for sellers who run Amazon plus a Shopify store and want one coordinated plan.

TL;DR decision

• Choose ReplenishRadar if you sell on Shopify plus Amazon and need one unified inventory view, coordinated forecasting, and transfer planning.
• Choose SoStocked if you are Amazon-only and want an Amazon-first tool and workflow.

What you are actually deciding

1. Scope: Amazon-only optimization vs multi-channel coordination.
2. Coordination: do you need to prevent Shopify sales from stealing inventory that Amazon needs, and vice versa?
3. Workflow: transfer planning and inbound visibility tied to both channels, or Amazon-only.
4. Pricing and onboarding: self-serve trial vs sales-led onboarding.

How ReplenishRadar is built for Shopify plus Amazon

ReplenishRadar treats Shopify and Amazon as one planning problem:

• Unified inventory view across Shopify, Amazon FBA, and warehouse stock
• Forecasting that accounts for both channels in one plan
• Reorder recommendations tied to lead times and safety stock
• FBA restock suggestions that consider what Shopify still needs
• FBA inbound tracking and reimbursement visibility
• Create FBA inbound plans directly through Amazon and skip Seller Central entirely
• One-click manifest export matching Amazon's Send to Amazon template format
• Ordering constraints (MOQ, casepack, order multiple) enforced automatically
• Forecast accuracy validation: predictions compared against actual sales

Where SoStocked fits better

SoStocked is typically a better fit when:

• Amazon is your only channel, and you want an Amazon-first planning workflow.
• You want a tool that prioritizes Amazon constraints and reporting.

Critical differences that matter

Decision factor	ReplenishRadar	SoStocked
Channel scope	Shopify plus Amazon	Amazon-first
Unified multi-channel view	Yes	Not the focus
Coordinated forecasting across channels	Yes	Amazon-only by default
Transfer planning	Coordinated with Shopify needs	Amazon-focused
FBA inbound plan creation	Yes, directly through Amazon	Manual in Seller Central
Manifest export	One-click, Amazon template format	Varies
Ordering constraints (MOQ, casepack)	Automated enforcement with LCM rounding	Varies
Forecast accuracy validation	Built-in (predictions vs actuals)	Not a primary feature
Pricing discovery	Public tiers	Starts at $158/month, scales with order volume
Trial and onboarding	Self-serve trial, 14 days	30-day free trial, demo or sales-led onboarding
AI agent integration (MCP)	Built-in MCP server for Claude, Cursor, and custom AI agents	Not available

Pricing and onboarding

ReplenishRadar pricing is public and self-serve: $99-$499/month based on SKUs, stores, and order volume.

SoStocked starts at $158/month ($126/month on an annual plan) and scales with your monthly order volume. They offer a 30-day free trial, though onboarding often involves a demo or sales conversation. SoStocked is now part of Carbon6/SPS Commerce, so the product direction may evolve under new ownership.

Bottom line

If you are Shopify plus Amazon, unified planning wins. Choose ReplenishRadar. If you are Amazon-only and want an Amazon-first workflow, SoStocked can fit.

Get your free inventory report → and see how ReplenishRadar unifies your Shopify and Amazon inventory in minutes.

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Related Reading:

• Amazon FBA Restock Strategies
• Multi-Channel Inventory Challenges
• Connect an AI Agent to Your Amazon and Shopify Inventory

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Sources

Competitor information is based on publicly available data as of February 2026. Features and pricing may change.

• SoStocked pricing page
• Carbon6 SoStocked overview
• SPS Commerce acquisition of Carbon6 (Jan 2025)
• ReplenishRadar pricing and features pages