Shopify Sidekick Inventory Management: What It Can (and Can’t) Do in 2026

TL;DR: Shopify Sidekick is an AI assistant built into your Shopify admin — it answers inventory questions, surfaces low-stock alerts via Sidekick Pulse, and can trigger lightweight Shopify Flow automations. What it cannot do is produce 6-month demand forecasts, calculate reorder quantities with lead-time and MOQ logic, generate structured purchase orders, or tell you the revenue at risk from a coming stockout. If you are migrating away from Stocky before the August 31, 2026 sunset, Sidekick handles the conversational side; Forthcast handles the planning side.

What Shopify Sidekick Actually Does for Inventory

Shopify Sidekick launched publicly in 2024 and reached over 750,000 new stores in Q3 2025 alone, with nearly 100 million conversations processed to date. It is an AI assistant embedded directly in the Shopify admin — you ask it questions in plain English and it answers using your live store data.

For inventory, Sidekick is genuinely useful for reactive, point-in-time questions:

• Stock level queries — “Which products have fewer than 20 units left?” returns an instant, accurate answer from your live inventory.
• Sell-through analysis — “What is my sell-through rate on the winter jacket collection?” pulls current data without any report building.
• Conversational filtering — “Show me all SKUs that haven’t sold in 60 days” works as a fast filter that would otherwise require a custom report or export.
• Flow automation drafting — You can prompt Sidekick to build a Shopify Flow automation in plain language: “When inventory drops below 10, send me a Slack notification.” Sidekick generates the workflow for you to review and activate.

These capabilities are real and save time. For small merchants with simple catalogs, Sidekick replaces a significant amount of ad hoc spreadsheet work.

Sidekick Pulse: The Proactive Inventory Feature

Shopify’s Winter ‘26 Edition (December 2025) added Sidekick Pulse — the most significant inventory-adjacent upgrade Sidekick has received. Rather than waiting for you to ask a question, Sidekick Pulse proactively surfaces inventory imbalances and growth opportunities when you open the admin.

For Shopify Plus merchants, Pulse can also suggest stock transfers between locations based on regional demand signals. This is a genuine step toward proactive inventory management — but it is still reactive in a fundamental sense: it surfaces problems that already exist in your current stock levels. It does not produce a forward-looking forecast of what demand will look like in three or six months.

Think of Sidekick Pulse as a smart dashboard that tells you what is happening right now. Forthcast is the engine that tells you what will happen next month — and what to order, when, and how much.

What Sidekick Cannot Do: The Structural Gaps

The capability gap between Sidekick and a dedicated forecasting tool is not a matter of features that will be added in the next release. It is a structural difference in what the two systems are built to do.

No Demand Forecasting Horizon

Sidekick can tell you your current sell-through rate. It cannot tell you what you will sell in July if current trends continue, if you run a promotion, or if last year’s seasonal pattern repeats. Forthcast runs machine learning across your full sales history to produce 6-month SKU-level demand forecasts that account for seasonality, trend, and promotional spikes. Sidekick has no equivalent output.

No Lead Time or MOQ Logic

When Sidekick flags a low-stock SKU, it does not know your supplier’s lead time is 45 days or that the minimum order quantity is 500 units. Forthcast builds lead times, MOQs, and days-of-cover targets into every reorder recommendation, producing a specific order quantity tied to a specific order date — not a generic “you might run out” alert.

No Automated Purchase Order Generation

Sidekick can draft a supplier notification email through a Shopify Flow automation, but it cannot generate a structured purchase order that tracks in-transit inventory and feeds back into your reorder calculations. Forthcast generates and manages POs natively, including in-transit stock visibility so you never double-order because you forgot a shipment was already on its way. This was one of Stocky’s core functions — and it is one of the primary gaps Sidekick cannot fill for migrating merchants.

No Revenue-at-Risk Calculation

Forthcast calculates how much revenue a specific stockout will cost you if you do not reorder by a specific date — a “revenue at risk” figure that turns a vague warning into a business case for action. Sidekick surfaces no equivalent calculation. You know a product is low, but not what it will cost you.

Thin Data Limitations

For stores with less than 12 months of sales history or low per-SKU velocity, Sidekick’s inventory suggestions can be unreliable. Forthcast handles thinner data through comparable-SKU modeling and prior adjustment, giving new product lines a reasonable baseline rather than no forecast at all.

Multi-Warehouse Complexity

Sidekick’s multi-location transfer suggestions are Shopify Plus-only and handle simple cases. Complex inventory allocation across multiple warehouses, 3PL relationships, or split shipments is beyond what Sidekick can reason about today.

Sidekick vs Forthcast: Capability Comparison

The Right Framing: Complementary, Not Competitive

The most useful way to think about Sidekick and Forthcast is not as alternatives but as tools that operate in different time horizons:

• Sidekick tells you what is happening. It is your real-time inventory assistant — fast, conversational, and always up to date with your current stock.
• Forthcast tells you what is going to happen — and what to do about it. It runs the forecasting engine, calculates the right reorder quantities, generates the purchase orders, and tracks the revenue you are putting at risk if you delay.

Many merchants will find that Sidekick handles their day-to-day inventory questions satisfactorily. The question is whether day-to-day answers are enough — or whether you need a plan for next quarter.

For deeper reading on the specific inventory mistakes that Sidekick’s reactive approach leaves merchants exposed to, see our spoke piece: 5 Inventory Mistakes Shopify Sidekick Can’t Catch (And How to Avoid Them).

For a broader comparison of Sidekick against the full landscape of dedicated inventory apps, see: Shopify Sidekick vs Dedicated Inventory Apps: When Free AI Isn’t Enough.

What to Do Before the Stocky Sunset

Shopify is retiring Stocky on August 31, 2026. The app was delisted from the App Store on February 2, 2026, and existing installs will stop working at the end of August. If you are a current Stocky user evaluating what to do next, you have roughly four months to make a decision.

Shopify has pointed partly to Sidekick as part of the replacement picture — and Sidekick does handle the conversational inventory questions that Stocky’s dashboard used to answer with reports. But Stocky’s core function was purchase order management and reorder point calculation. Sidekick does not replace that.

For a full migration guide including a step-by-step walkthrough of moving from Stocky to a dedicated forecasting tool, see our Stocky sunset guide and Forthcast alternative overview.

Forthcast is a flat-rate $19.99/month forecasting app for Shopify that replaces everything Stocky did for purchase order management — plus adds the 6-month demand forecasting and revenue-at-risk reporting that Stocky never had. Setup takes under 10 minutes, there is a 14-day free trial with no credit card required, and it syncs directly with your Shopify store data.

Start your free 14-day Forthcast trial — no credit card required.

Frequently Asked Questions

Does Shopify Sidekick replace Stocky?

Partially. Sidekick can answer the conversational inventory questions that Stocky’s reporting dashboard answered with charts and tables. But Stocky’s core functions — purchase order management, reorder point calculation, in-transit stock tracking, and supplier lead time logic — are not replicated by Sidekick. Merchants migrating from Stocky before the August 31, 2026 sunset will need a dedicated inventory tool for those functions.

Can Sidekick generate purchase orders?

No. Sidekick can draft a supplier notification email through a Shopify Flow automation, but it does not generate structured purchase orders that track in-transit inventory. Forthcast generates and manages full POs natively, including in-transit visibility that prevents double-ordering.

Does Sidekick do demand forecasting?

No. Sidekick can tell you your current sell-through rate and flag products that are running low, but it produces no forward-looking demand forecast — no ML model, no seasonality decomposition, and no concept of what you will need to order in three or six months. Forthcast produces 6-month SKU-level forecasts using machine learning applied to your full sales history.

What’s the difference between Sidekick and Forthcast?

Sidekick is a reactive AI assistant that answers inventory questions using your current store data. Forthcast is a proactive forecasting engine that calculates future demand, generates reorder quantities with lead-time and MOQ logic, creates purchase orders, and calculates the revenue at risk from coming stockouts. The simplest summary: Sidekick tells you what is happening; Forthcast tells you what is going to happen — and what to do about it.