Free · Private · Runs in your browser
Test your decision before it costs you money
Change one number and watch it cascade through your business. Find the exact point where the plan breaks, and compare two futures side by side.
Flagship simulators
One standout simulator per category. Start here.
- E-Commerce & RetailFree Return Iceberg Simulator: The Hidden Loss Behind Your Return RateFree returns look like a marketing perk. See the shipping, write-offs and lost fees underneath, and find the return rate where your store stops making money.Open simulator
- SaaS, AI & CloudAI Wrapper & LLM Token Margin Stress TestSee what model tokens, a generous free tier and retries do to the margin of an AI product, and find the point where every new user costs you money.Open simulator
- B2B, Agency & OpsAgency Scope Creep Shield: Margin Erosion Simulator for Fixed-Price ProjectsSee how unbilled extra work, discounts, project management and slow payment melt the margin of a fixed-fee project, and how much change-order recovery protects it.Open simulator
- Property & EnergyRooftop Solar & EV Charging vs Grid: 10-Year Inflation Stress TestCompare a financed rooftop solar system with staying on the grid over ten years, and find the electricity price, loan rate or sunshine level at which solar stops paying.Open simulator
- Creator EconomyCreator Runway & Algorithm Crash SimulatorSee what happens to your cash flow and your savings runway when the algorithm cuts your reach, a sponsor leaves or costs rise, and find the point where income stops covering life.Open simulator
- Global TradeExport Incoterms Landed Cost & EU CBAM Carbon Tax Stress TestSee what delivered-duty-paid terms, freight, import duty, the EU carbon border adjustment and a currency move do to the margin of an export shipment.Open simulator
The full encyclopedia: 120 simulators
Browse by category or press Ctrl K (Cmd K on Mac) to search them all.
E-Commerce & Retail
20 simulators
Margins, ads, returns and shipping for online stores.
- Free Return Iceberg Simulator: The Hidden Loss Behind Your Return Rate
- Online Store Profit Squeeze Simulator
- Marketplace vs Shopify Fee Showdown: Which Channel Keeps More of Each Sale?
- Free Shipping Threshold Optimiser: Where to Draw the Line Without Paying for It
- Dead Stock Cash Trap: What Unsold Inventory Really Costs Every Month
SaaS, AI & Cloud
20 simulators
Churn, acquisition cost and AI bills for subscription products.
- AI Wrapper & LLM Token Margin Stress Test
- SaaS Churn & AI Cost Burn Simulator
- Cloud Egress Shock Simulator: When Data Transfer Out Eats Your Margin
- Viral Traffic Server Crash Simulator: What a Traffic Spike Really Costs
- Freemium vs Free Trial Simulator: Which Model Actually Pays for Itself
B2B, Agency & Ops
20 simulators
Utilisation, scope creep and cash flow for service businesses.
- Agency Scope Creep Shield: Margin Erosion Simulator for Fixed-Price Projects
- Agency Capacity & Margin Stress Test
- Meeting Cost Iceberg Simulator: What Your Calendar Really Costs Per Month
- Staff vs AI Automation Simulator: Is Automating the Work Really Cheaper?
- Key Employee Loss Simulator: What Happens When a Critical Person Leaves
Property & Energy
20 simulators
Occupancy, turnover and holding costs for rental properties.
- Rooftop Solar & EV Charging vs Grid: 10-Year Inflation Stress Test
- Short-Term Rental Shock Simulator
- Short-Term vs Long-Term Rental Simulator: Does Nightly Hosting Really Beat a Lease?
- Heat Pump vs Gas Boiler 10-Year Simulator: Installation, COP and Energy Prices
- EV Home Charging vs Public Station Simulator: Does a Wallbox Pay for Itself?
Creator Economy
20 simulators
Reach, sponsorships and your own time for solo creators.
- Creator Runway & Algorithm Crash Simulator
- Creator Income Reality Check
- Paid Community Churn Iceberg: What Member Churn Really Costs Your Skool-Style Group
- YouTube Long-Form vs Shorts: Which Format Actually Pays per Hour of Work?
- Sponsorship Pricing Breakpoint: The Rate Where Brand Deals Stop Paying You
Global Trade
20 simulators
Freight, duty, currency and terms for export shipments.
- Export Incoterms Landed Cost & EU CBAM Carbon Tax Stress Test
- Export Shipment Margin Stress Test
- Factory OEE and Downtime Domino Simulator: What Every Lost Hour Really Costs
- Factory Rooftop Solar and I-REC Offset Simulator: Own Power Versus the Grid Bill
- Container Empty Space Loss Simulator: What Unused Cubic Metres and Air Top-Ups Cost
More than a calculator
Domino effect
Five connected stages show how a change in one input spreads through the whole operation, turning green, amber or red.
Find my breaking point
A reverse stress test walks every input through 1,000 steps to find the exact value where the result reaches zero.
Parallel universe
Compare your current plan with an alternative over 24 months and see the month one overtakes the other.
Hidden cost iceberg
See the costs above the waterline next to the ones most people miss below it.
Your numbers stay with you
Every calculation runs in your browser. There are no accounts and nothing is sent to a server. Shared scenarios are encoded in the link itself.