Guides & tools
Guides and free calculators
Practical ways to work out what each product costs and earns, written by the maker of MarginDeck. The calculators run in your browser; nothing is uploaded.
Guides
Product finance methods and MarginDeck how-tos.
- AI Connections
Record revenue, split costs, and check profit with Claude or Codex
Connect your AI assistant to MarginDeck, save your first records, and check what a product earned after costs.
Read the guide → - AI Connections
Use your AI assistant for a monthly product review
Compare months with Claude or Codex, find where a product's profit change came from, and decide what to check next, using a three-product example.
Read the guide → - Product Finance
Contribution Profit for Indie Apps: A Practical Guide
Learn how to calculate product-level contribution profit, choose useful cost boundaries, and turn the result into better indie app decisions.
Read the guide → - Product Operations
How to Allocate Shared SaaS Costs Across Multiple Products
Compare equal, revenue-weighted, usage-based, and custom cost allocation, with a worked example and effective dates.
Read the guide → - Product Finance
Sync App Store Connect Revenue per App
Connect App Store Connect or import monthly sales reports to get each app's net proceeds by month, next to its costs, without counting RevenueCat revenue twice.
Read the guide → - Product Finance
From RevenueCat Revenue to Profit per App
The RevenueCat dashboard shows revenue and proceeds, not profit. Here is how to turn proceeds into profit per app by adding hosting, API and tool costs.
Read the guide → - Indie Operations
The Real Cost of Running Multiple Software Products
A practical way to uncover direct expenses, shared subscriptions, owner time, and hidden obligations across a portfolio of software products.
Read the guide → - Product Planning
What Will a New Software Product Cost Over the Next 12 Months?
Build a practical 12-month cost plan for a new app by separating existing resources, new scheduled costs, one-time expenses, and currencies.
Read the guide → - Product Operations
How to Change a Subscription Cost Without Rewriting History
A practical method for recording subscription price, cadence, and billing-date changes while preserving the terms that applied to earlier periods.
Read the guide →
Free tools
Quick scenarios in your browser. Nothing is uploaded.
- Free tool
Contribution margin calculator
Revenue minus store fees, payment fees and API costs. Get the margin, the ratio and the break-even revenue.
Open the tool → - Free tool
Overhead and shared cost calculator
Split one monthly cost pool across 2–5 products by equal share, revenue or custom percentages, and see estimated contribution profit.
Open the tool → - Free tool
Burn rate and runway calculator
Your net monthly burn, and how many months the cash you set aside lasts at current revenue and costs.
Open the tool →