Synder is the better choice if your accounting system is anything other than QuickBooks or Xero, or if you want the cheapest reliable way to post Shopify and Amazon payouts as summaries. ConnectBooks is the better choice if you want per-SKU cost of goods sold and inventory carried inside QuickBooks Online, QuickBooks Desktop Enterprise or Xero, and you are willing to pay roughly three times Synder’s entry price for it. A seller running both channels at real volume usually needs the second thing and does not know it until the first Amazon settlement fails to match a bank deposit.
Prices and features below were checked on both vendors’ live pages in September 2026.
The problem both tools solve
Shopify and Amazon pay you differently and neither pays you what you sold. Shopify Payments deposits a net payout after card processing fees and refunds, on a schedule that ignores your month end. Shopify’s own payouts documentation covers the mechanics, including that payouts can arrive in a different currency than the sale. Amazon settles every two weeks in a report that lists sales, referral fees, FBA fees, storage, advertising, refunds, reimbursements and a reserve, and Amazon’s settlement report reference shows those as dozens of amount types in a flat file.
Post either deposit as revenue and your books are wrong by the full fee load. Both Synder and ConnectBooks read the source data, post the gross sale and each fee separately, and match the net to the bank. The difference is how much detail they carry and where the trade-offs land.
What Synder offers
Synder’s pricing page lists Basic at $52 a month for 500 sales transactions and two integrations, Essential at $103 for 3,000 transactions and unlimited integrations, Pro at $240 for 20,000 and Pro Max at $480 for 40,000, all shown as billed yearly, with a Premium tier by quote. Its integrations page lists Shopify, Amazon, Etsy, Walmart and eBay on the sales side, TikTok Shop through dedicated QuickBooks and Xero integration pages, and QuickBooks Online, QuickBooks Desktop, Xero, Sage Intacct and NetSuite on the accounting side, with Puzzle and Intuit Enterprise Suite also named on pricing.
Synder’s design is transaction-level sync with configurable summarization. It pulls each sale or payout, applies mapping rules, and posts to the ledger. It handles payment processors as first-class sources, which matters for a Shopify store running PayPal or Klarna next to Shopify Payments.
What ConnectBooks offers
ConnectBooks syncs Amazon, Shopify, Walmart, TikTok Shop and eBay into QuickBooks Online, QuickBooks Desktop Enterprise or Xero. Pricing on its site starts at $149 a month for Gold, $199 for Diamond and $349 for Platinum, adjusting by monthly order volume, with a 30 day free trial. Sales can post as a summary or at item level; the item-level mode carries per-SKU cost, moves landed cost from inventory asset to COGS as units sell, and tracks stock in real time across warehouses and channels. Each Amazon settlement posts with its settlement ID so a bookkeeper can trace a ledger entry back to the report. Crunch, the AI CFO built into the product, is in active beta.
Two published limits from its own pricing FAQ, quoted so you are not surprised in a demo: “The platform does not currently provide an open API for external use,” and “Bin or zone level tracking is not available.”
Where Synder wins
Entry price. $52 against $149. A seller doing 400 orders a month across both channels who only needs accurate summaries has no reason to pay the difference.
Ledger breadth. NetSuite, Sage Intacct and QuickBooks Desktop (not just Enterprise) are on Synder’s list. ConnectBooks names QuickBooks Online, QuickBooks Desktop Enterprise and Xero. A brand planning a NetSuite migration has one option here.
Channel breadth beyond the big marketplaces. Etsy, Square, WooCommerce and payment processors are inside Synder. ConnectBooks does not list Etsy among its integrations.
Integration count. Essential and above allow unlimited integrations. Shopify plus Amazon plus PayPal plus Stripe is four sources, and Synder treats them all the same way.
Where ConnectBooks wins
Inventory inside the books. Synder posts sales and fees. ConnectBooks also posts the cost side per unit and keeps the inventory asset balance current, so gross margin by SKU is a ledger report rather than a spreadsheet you maintain on the side. For a seller with 80 SKUs where a dozen are underwater after fees, that is the number that decides what to reorder.
Settlement reconciliation as the unit of work. Amazon reserves, reimbursements and fee reversals are posted against the settlement they belong to, with the ID attached. When a deposit is off by $214.60, you find it in minutes.
Onboarding done for you. The accounting page describes free done-for-you onboarding and QuickBooks or Xero setup with a US-based team. Chart of accounts mapping is where most connector installs go wrong, and having someone else do it is worth something.
QuickBooks Desktop Enterprise as a first-class target. Larger sellers who never left Desktop get a native path.
A worked case: Shopify and Amazon together
Take a seller with $60,000 a month on Amazon and $25,000 on Shopify, 1,800 combined orders, 70 SKUs, on QuickBooks Online. On Synder they would sit on Essential at $103 a month, post summarized payouts from both channels, and keep COGS in a monthly manual journal from a spreadsheet. On ConnectBooks they would sit on a mid tier, post item-level entries, and let the software compute COGS per unit.
Synder costs less and is correct at the payout level. ConnectBooks costs more and is correct at the SKU level. IRS Publication 538 requires businesses that account for inventory to value it at the beginning and end of the year and generally to use accrual for purchases and sales; both setups can satisfy that, but only one of them makes the year-end inventory number fall out of the daily bookkeeping rather than a count and an adjustment.
If the seller is still reconciling Shopify by hand today, the walkthrough ConnectBooks publishes on matching Shopify payouts to bank deposits lays out the five steps either tool automates, and it is worth doing once manually before you buy anything, because you will understand what the software is supposed to produce.
Decision
Under about 1,000 orders a month with inventory tracked elsewhere, or on any ledger outside the QuickBooks and Xero family: Synder. Above that, with margin by SKU as the question you actually need answered, and on QuickBooks Online, Desktop Enterprise or Xero: ConnectBooks. Run both trials against the same Amazon settlement and see which output your bookkeeper can reconcile without asking you a question.
