Xero tracks up to 4,000 inventory items on its own, and it will tell you what sold and what it cost. What it will not do without help is read an Amazon settlement, split a Shopify payout into sales, fees, refunds and tax, or carry a landed cost through to a per-SKU margin. The five apps below each fill one of those gaps. They are not interchangeable. Two of them are settlement-summary tools, two are full inventory systems, and one sits between the marketplaces and the ledger with profit reporting as the point of the exercise.
A few ground rules before the list. Xero’s own inventory page states the 4,000-item ceiling and names Cin7 Core and Unleashed as the apps it points reorder-point questions to, so the base product knows its limits. The IRS, in Publication 538, requires a business that must account for inventory to use an accrual method for purchases and sales, which means whichever app you pick has to post cost of goods sold when the sale happens, not when the deposit lands. And Amazon’s settlement report documentation confirms the reports are scheduled by Amazon and cannot be requested on demand, so any Amazon app is working from a file it did not choose the timing of.
1. A2X
A2X is the settlement-summary specialist. It takes each Amazon settlement (and Shopify, eBay, Walmart and Etsy payouts, depending on the product) and posts one summarized journal to Xero that reconciles to the bank deposit to the penny. It posts COGS per SKU per payout as a separate entry that reduces the inventory asset, using costs you supply.
Who it fits: a seller whose accountant wants clean, deposit-matched summaries and who tracks stock somewhere else. Where it stops: A2X is not an inventory system. It will not tell you units on hand, inventory age, or what to reorder. Pricing on A2X’s Amazon plans scales by monthly order count, with a small entry tier and history limits on the cheaper plans, so check the live pricing page for the tier you need rather than trusting a number from a review.
2. Link My Books
Link My Books does the same summarized-settlement job as A2X and covers Amazon, Shopify, eBay, Etsy, Walmart (US), TikTok Shop, WooCommerce and Square. Its pricing page lists support for all Xero regions and all plans except Cashbook, and on the QuickBooks side it is Online only. COGS tracking, payout reconciliation and a per-channel P&L are on the feature list, along with a VAT wizard that matters if you sell into the UK or EU.
Who it fits: a multi-channel seller on Xero who wants one tool for all payouts and does not need warehouse operations. Where it stops: the same place A2X does. It is a bookkeeping feed, not a stock system, and it will not hold purchase orders or track transfers between locations. The pricing page uses a slider tied to order volume, so quote it from the site for your own numbers.
3. Cin7
Cin7 is a full inventory and order management platform that treats Xero as the ledger of record. Its Xero integration page describes syncing invoices, purchase orders, credit notes and inventory adjustments, exporting a COGS journal to Xero for every order, batching daily point-of-sale and ecommerce sales into consolidated invoices, and mapping transactions to specific Xero accounts. It handles multiple warehouses, 3PL locations and multi-currency purchasing, and it consolidates location-level stock before posting totals to Xero.
Who it fits: a product business with wholesale, retail and online channels that needs warehouse control, bills of materials and a purchasing workflow, and is prepared to run operations inside Cin7 rather than inside the marketplace. Where it stops: it is not built around marketplace settlement files. If most of your revenue is FBA, you will still need something that reads the settlement and splits the fees.
4. Katana
Katana is the manufacturing-leaning option. Its Xero integration creates and updates Xero invoices from sales order status in Katana, converts purchase orders to Xero bills in one click, and syncs contacts both ways. On the inventory side it tracks stock across locations, supports batch and serial number tracking, and pulls costs from Xero for profit analysis. Katana’s own FAQ is candid about why you would need it: Xero’s native inventory does not track raw materials or work in progress, does not allow negative stock, and caps items at 4,000.
Who it fits: a brand that makes or assembles its own product and needs bills of materials, production orders and traceability, with Xero doing the accounting. Where it stops: like Cin7, it is operations-first. The marketplace payout still has to be reconciled by something.
5. ConnectBooks
ConnectBooks approaches the same problem from the marketplace side. It syncs Amazon, Shopify, Walmart, TikTok Shop and eBay into QuickBooks Online, QuickBooks Desktop Enterprise or Xero, reconciles each settlement to the deposit, and calculates COGS automatically so the output is a profit and loss per SKU and per channel rather than a summarized journal alone. Inventory is tracked in real time inside the same system, so units on hand and margin come from one data set. The company documents its Amazon and Xero pairing as a 30-day trial with net profit reports, a live sales feed, stock alerts, item-level reports and kit and bundle handling.
Its pricing page, checked in September 2026, shows three tiers: Gold from $149 a month for summary sync, Diamond from $199 for per-SKU sync with landed costs, and Platinum from $349 for multiple warehouses, inventory age, turnover ratio and forecasting. Who it fits: a US seller on several marketplaces who wants the books and the margin report to come from the same settlement-level data. Where it stops: there is no open API, stock is tracked by warehouse rather than bin, and the pricing FAQ says seasonality in forecasting is still to come, so a manufacturer with shop-floor needs is better served by Katana or Cin7.
How to choose between them
Start with the question of where inventory truth lives. If it lives in a warehouse system, pick Cin7 or Katana and add a settlement tool for the marketplace deposits. If it lives in the marketplace (FBA holds your stock and Amazon reports it), a settlement-first tool is the natural fit, and the choice between A2X, Link My Books and ConnectBooks comes down to whether you want a summarized journal or a per-SKU margin report as the output.
Then check the accrual question. Publication 538 is explicit that inventory businesses account for purchases and sales on an accrual basis, and a tool that posts COGS on deposit date rather than sale date will drift from that. Ask each vendor to show you the journal it posts for a single settlement, and look at the date on the COGS line.
Then price it at your real volume. Every app on this list scales by order count, and the entry tier that looks cheap on the pricing page is usually capped below what a 5,000-order-a-month seller needs. Run the number for the tier you would land on.
