01
Bring a credible baseline
Import expected and promotion units with realized prices and variable costs. Map your columns and resolve validation issues before the file enters the analysis.
Promotion economics, made visibleFind the promotions
Find the promotions
worth repeating.
Turn campaign spreadsheets into a clear contribution decision. See what discounting, volume, refunds, and later displacement actually do to the margin.
No account needed for preview Campaign data stays on your device
Autumn promotion review
Synthetic example
Promotion overview8 product–campaign rows
Gross unit lift
+95.6%
Contribution change
−€2,644
| Product / campaign | Unit lift | Contribution Δ |
|---|---|---|
| Daily blend · 500 g | +95.0% | +€898 |
| Everyday tote | +134.6% | -€3,531 |
| Hydrating serum · 30 ml | +84.6% | +€1,839 |
Hypothetical inputs · supplied no-promotion baseline
+96%More units can still mean
less contribution.
less contribution.
Local by design · no campaign uploadsExplicit assumptions · no opaque scoresSpreadsheet friendly · CSV in, report outOne-time license · no AI bill
From spreadsheet to decisionThe whole economics of an offer.
The whole economics of an offer.
In one focused workspace.
Built for merchants and consultants who need to explain a promotion’s commercial result.
02
See where margin went
Separate volume, price, refunds, campaign spending, supplier support, and later displacement. Inspect a break-even threshold for each product–campaign row.
03
Pressure-test and explain
Vary the baseline and commercial assumptions, compare sensitivity, and export a PDF-ready decision report with the methods and limits included.
The decision behind the discount
A 20% discount needs more than 20% extra volume.
At a €50 regular price and €25 variable cost, a €40 offer reduces unit contribution from €25 to €15. Before campaign costs, you need 66.7% more units to preserve contribution.
Find your break-even liftBaseline · 1,000 units × €25€25,000
Promotion · 1,600 units × €15€24,000
Additional campaign spending−€300
Contribution change−€1,300
Hypothetical example. Revenue increases €14,000. The supplied no-promotion baseline determines this comparison.
Free tools
Make the next pricing decision clearer.
Eight focused calculators. No registration, no spreadsheets to upload.
Did the promotion add contribution
Compare a promotion's contribution with a no-promotion baseline. Include discounted prices, unit costs, campaign spending and supplier funding.
How much more must a discount sell
Calculate the additional unit sales a discount needs to preserve contribution, including fixed campaign spending.
The free item still has a cost.
Check contribution per buy-X-get-Y-free bundle, its effective discount and the bundle volume needed to match full-price unit sales.
Margin and markup use different denominators.
Convert between margin and markup, and calculate the selling price required for a target margin or markup.
What if demand responds differently to price
Explore price, quantity, revenue and contribution under an explicit constant-elasticity demand assumption.
How much funding makes the promotion work
Calculate the supplier support a promotion needs to match baseline contribution, with per-unit and fixed funding separated.
What happens outside the promoted SKU
Adjust a promotion's contribution change for displaced product sales, later-period payback and halo contribution.
Mark down now or hold for later
Compare marking down inventory now with holding it for a later price, accounting for expected sales, salvage and holding costs.
A complete decision workflow
Review. Experiment. Plan.
Three local workspaces for understanding the last promotion and choosing the next one.
Campaign review
Use when the question is what a promotion contributed against a supplied no-promotion comparison.
ExploreExperiment studio
Use before an experiment to plan allocation and approximate power, or after it to compare independent assignment-unit outcomes.
ExplorePortfolio planner
Use when the next decision is which mutually exclusive offers to choose under operational constraints.
ExploreOwn the workbench
One purchase. Keep the tool.
Offline software, transparent calculations, and a complete reporting workflow.
Personal
Review your promotions and run a defensible experiment workflow.
€49 one-time · applicable tax extra
- Campaign review: up to 25,000 rows
- Experiment design, allocation and outcome analysis
- Power and minimum-detectable-effect planning
- Local scenarios, reports and portable backups
- Single-file offline software
- One person, one business
Agency
A complete local review, experiment and portfolio-planning workflow.
€149 one-time · applicable tax extra
- Everything in Personal
- Portfolio optimizer: 120 products / 2,000 offers
- Budget, stock, capacity and markdown constraints
- Exact or explicitly bounded optimization results
- Local batch runner for CSV → JSON, CSV and HTML
- Client work, internal team use and report branding
One-time license for version 1. No subscription or external AI bill. The optional Agency batch runner needs Node.js 20 or later. Major future versions are not promised. Self-service full refund requests within 14 days; mandatory rights remain unaffected. Software redistribution is excluded.
Try the public previews before purchasing: campaign review, experiment studio, and portfolio planner. Checkout availability is confirmed on the order page.
Before you decide
Clear answers. Clear limits.
Does this estimate a causal promotion effect?
No. It calculates contribution against your supplied expected no-promotion baseline. The tool makes assumptions explicit, and the scenario studio shows how those assumptions change the answer.
Does my campaign data leave my device?
No. CSV imports, project files, and calculations stay in your browser. Local project saving is optional. Payment and receipt data are processed separately by Stripe when checkout is activated.
What is included in contribution?
Variable unit costs, allocated campaign spending, supplier funding, full-refund revenue, and supplied post-promotion displacement. Fixed overhead, income tax, and unrecorded spillovers are excluded.
Does it need Shopify, an account, or an AI subscription?
No. Bring a campaign-level CSV from a spreadsheet or any commerce system. The downloadable edition runs from a single HTML file with no account or external AI service.
How is this different from a daily profit dashboard?
MarginTrial focuses on a specific promotion decision: the supplied counterfactual, the margin given up on baseline units, break-even response, campaign costs, and later displacement.
How do I get the product after payment?
An active paid order unlocks the offline download, software license, invoice link, and recovery file. Purchases can be restored from a license or private recovery link. No manual onboarding is needed.