Calculators, not
another tool listicle.
Each of these takes your numbers and runs a model that is documented in the accompanying post — the same arithmetic, not a simplified version of it. They run entirely in your browser. Nothing you type is sent anywhere, and none of them ask for an email.
This page used to be a list of software I recommend. That is a page an AI summary can replace in one paragraph, so it is gone. A calculator that takes your own inputs is not.
Promo economics
Loyalty & retention
Points Liability & Breakage Model
Loyalty points are debt in a currency you print. Model the nominal liability, expected breakage, and the present value of what you will actually pay out.
Open the calculator →Streak & Retention Hazard Model
Work out which day of a streak to place a reward. Early rewards reach everyone and save almost nobody; late rewards reach few and save most of them.
Open the calculator →Content & SEO
Content ROI & Payback Calculator
Cost per published piece, the traffic it needs to earn back, and the month you break even. Includes the case most models hide: the programme that executes perfectly and still returns nothing.
Open the calculator →Keyword Seasonality Forecaster
Paste 12 or 24 months of search volume and get the peak month, the seasonality index, and the date you need to publish to be ranking when demand arrives.
Open the calculator →These are the demo versions
Every default in here is illustrative. The models get useful when they are fitted to your own data — your measured redemption hazard, your real margin, your actual conversion rate — because that is when the output stops being a sanity check and starts being a decision.