Software for ecommerce startups that watch margin, stock and the holiday rush

Three numbers that make a store different

Most startup advice assumes recurring revenue and near-zero cost per sale. An ecommerce founder lives with three things that advice skips.

• Contribution margin per order. What's left after product cost, packing, shipping, payment fees and the ad spend it took to win the sale. Gross margin flatters you because it ignores most of those.
• Cash tied up in inventory. You pay a supplier now and get the money back when units sell. Growth makes this worse before it makes it better, because a bigger order ties up more cash.
• Seasonality. Gifting peaks, sale events and weather swing demand. You commit to stock and ad budgets months before you know how the peak went.

Get these three into one view and most of your other decisions get easier: which product to push, how much to reorder, when you can afford to hire.

Working out contribution margin on a real order

Shopify's guide to contribution margin vs gross margin defines contribution margin as the money a business keeps after paying the variable costs of making its products, and recommends using it product by product to decide what to invest in and what to drop. In a D2C brand, the ad spend is usually one of those variable costs, whatever your income statement calls it.

Here's a worked example with made-up but typical-looking numbers for one $60 order of a skincare bundle. Swap in your own.

Notice what happened. Gross margin on this order is 70%, which sounds great. Contribution margin is 23%, and a 20% rise in ad cost would cut it to 18%. That gap is why so many brands that look profitable on a product sheet run out of cash.

The Financial Planner has an E-commerce template that pre-fills revenue items, cost categories and assumptions. Each revenue item takes a unit price, forecast units and cost of goods per unit, and gross margin shows on the Dashboard tab. Model ad spend as an operating expense that grows with volume, then clone the project and use Compare to see a version where ads cost 30% more. That stressed case is the one an investor will ask about.

Inventory is cash you can't spend yet

Shopify's inventory turnover guide gives the formula as cost of goods sold divided by average inventory, and cites a retail benchmark of 10.86 turns a year. Products that sit in a warehouse pick up holding costs. A ratio below 1 means it takes more than a year to sell what you hold.

Turnover is a warehouse number, but the pain shows up in your bank account. Say you place a $40,000 order with your manufacturer in August for stock you'll sell from October to January. In Startup Health, burn is total spend minus revenue, so August shows a big spike and runway drops. The built-in alert may fire when runway falls below 6 months. That's correct, and it isn't a crisis, provided you can explain it.

1. Log the supplier deposit and balance in Expenses under an Inventory category, with the invoice attached as the receipt.
2. Set a quarterly budget on that category so the Budgets page shows actual stock spend against plan.
3. In the monthly check-in, use the month-end bank balance, as the guide advises, and write the reason for the spike in the snapshot's Burn section.
4. If you fund stock with a loan, add it on the Financial Planner's Loan Schedule tab so interest and repayments flow into the cash forecast.

The thing Nautis can't do here is know how many units you have. Stock levels, reorder points and purchase orders belong in your store platform or an inventory system.

Planning the holiday peak months ahead

The National Retail Federation defines the holiday season as November 1 to December 31, and on October 15, 2026 it forecast that holiday sales would grow 4.2% over 2025 to $1.013 trillion. For a small brand, the useful part is the date range: your stock, creative and offers have to be ready before November 1, so the planning happens in late summer.

Here's how the marketing side of a peak maps onto Nautis modules.

Put the operational launch on a Task board: stock arrival, site banner, discount codes, support cover. KPI tasks track a number toward a target, such as 1,200 orders in the peak week, so the board shows progress as well as ticks.

A September in a four-person skincare brand

To make this concrete, here's one plausible month for a brand doing a few hundred orders a week, with a founder, an ops lead, a marketer and a part-time designer.

• Week 1. The founder enters August's numbers in Startup Health. Burn jumped because of the holiday stock deposit, so she explains it in the snapshot before sharing it with her angel investors via a link with history turned on.
• Week 2. The marketer builds the Black Friday campaign in the Social calendar and asks the founder, as plan manager, to approve twelve posts. Two come back with Request changes.
• Week 3. The ops lead logs freight and packaging bills with Scan a Bill in Expenses, and sees the Shipping budget at 90% with a week left. He opens a Decision Loop entry: raise the free-shipping threshold from $50 to $65, expected outcome average order value up 8% in 30 days, review in 30 days.
• Week 4. The morning briefing from the Chief of Staff flags an overdue wholesale invoice to a boutique stockist. Do it drafts the reminder, the founder edits it and approves, and the payment gets recorded later with Record Payment.

Notice what's missing: no order tracking, no stock counts, no ad bidding. Those happen in the store stack all month, and the team brings the results into Nautis when a decision needs them.

The store stack Nautis sits next to

Be clear about what you'll still pay for. An ecommerce brand needs these regardless of what runs the company.

• A store platform for the catalogue, checkout and orders.
• Inventory and order management once you have many SKUs, more than one warehouse, or wholesale accounts.
• A fulfilment partner or shipping software for labels and carrier rates.
• A payment processor. Card data is covered by the PCI Data Security Standard, which applies to entities that store, process or transmit cardholder data. Let your processor carry that, and never paste card numbers into Nautis, a form or a note.
• Accounting software that handles inventory valuation, sales tax and cost of goods. Nautis isn't an accounting system and doesn't file tax.
• Ad platforms, email and SMS tools, and a support desk.

Nothing syncs from these into Nautis. You can connect tools under Integrations from a catalogue of 1,000+ apps so agents can read or act in them when asked, with writes waiting for approval by default. Check the catalogue for your exact tools before you count on it.

When an ecommerce startup should skip Nautis

• You're a one-person store and your platform's apps already cover it. Launch costs $49 a month at the time of writing, after a 14-day trial with no card. That's real money next to a few store apps. See pricing.
• Your hard problem is stock. Hundreds of SKUs, bundles and multiple warehouses need an inventory system first.
• You sell mostly on third-party marketplaces. Their seller tools and fee reports will matter more than anything here.
• You want the margin calculated for you from live orders. Nautis doesn't pull order data. A profit analytics tool connected to your store will.
• You need many years of vendor history. Nautis launched publicly in July 2026 and has few independent reviews.

Where it fits best is a brand of three to twenty people that has outgrown a shared spreadsheet for planning, cash and campaigns. Voyage, at $99 a month, gives 10 team members and 2,000 AI credits a month, which suits a small team that has hired an ops lead and a marketer.

FAQ

Sources

• US Census Bureau: Quarterly Retail E-Commerce Sales
• Shopify: Contribution margin vs gross margin
• Shopify: Inventory turnover ratio
• National Retail Federation: 2026 holiday sales forecast
• PCI Security Standards Council: PCI DSS