Every variable is yours
Nothing here is a static diagram with a play button. Change the inputs and the outcome re-renders under your hand — which is how intuition gets built instead of trivia.
Free to try · limited-time betaDon't
Don't
memorize it.
Play with it.
Play2Lrn turns the concepts that never quite stick — ad auctions, projectile motion, search intent — into simulations you can drag, break and replay. Move one control and the idea explains itself.
No card · nothing to install · 11 categories and growing
Live — drag me
physics / projectile motion
Range
602 m
Peak
193 m
Hang time
12.5 s
52°
78 m/s
Drag a slider. Notice you now know why 45° goes furthest without anyone telling you.
Concepts you can play with include Ad Rank, Quality Score, Projectile motion, Search intent, Gradient descent, Second-price auctions, Overfitting, Terminal velocity, Attribution windows, Titration curves, Neural nets, Conversion lag.
How it usually goes
Read it. Re-read it. Highlight it. Forget it.
- A definition you can recite but not use.
- A diagram that never moves.
- A worked example with someone else's numbers.
- Thursday, and it's gone.
How it goes here
Grab a control. Break the thing. Now you know.
- Every variable is a slider you can move.
- The output redraws the instant you touch it.
- Your numbers, your experiments, your mistakes.
- Understanding you can rebuild from scratch.
The library
Pick a shelf. Everything on it is free to try.
New simulations land regularly — search or filter by category to find one.
Free to tryai
LLMPrompt Lab
This interactive demo lets you understand how a good prompt is formed and how a good prompt results in a better output.
Play with it
Free to tryai
LLM Self Atention Mechanism
This interactive demo and simulation helps you understand the attention mechanism, which is at the core of transformers, which are again at the core of generative AI engines that help generate the relevant outputs that which have been their name to fame
Play with it
Free to tryai
LLM Token Window
This interactive demo helps you to understand the importance of the size of a token window, also known as a context window, and how making this context window smaller or larger can result in a better or worse output
Play with it
Free to tryai
LLM Word Prediction Engine
This interactive demo helps you to understand how an NLLM is able to generate text one word at a time based on its training data and the most probable output word.
Play with it
Free to tryai
Vector Embedding Space Explorer
While a little technical, this interactive demo helps you to understand how the text that is input in an LLM is converted into quantifiable numbers in a vector space and compared for similarity in order to produce relevant results that's the output.
Play with it
Free to tryMarketing
Email Delivery and List Decay Explorer
This simulation helps you to understand what are the technical and non-technical factors when doing email marketing that can impact the delivery of your email into spam or bring down the reputation of your domain from which the email is being sent
Play with it
Free to tryMarketing
SEO Ranking Factors
This interactive demo helps you to understand what are the different levers or variables related to a website for onpage, offpage and technical SEO that can impact its position in the search engine result page.
Play with it
Free to tryMarketing
Ad Fatigue Similator
This simulation lets you understand how running the same ad to a small audience over a period of time can lead to ad fatigue and higher cost per conversion. It also helps you to understand the relation between brand recall, conversions, and cost per conversion.
Play with it
Free to tryMarketing
AIDA Funnel Simulator
AIDA Funnel Simulator helps you to see the stages of a marketing funnel in action:
Play with it
Free to tryMarketing
Marketing Attribution Modeller
The attribution modeler helps you to understand the credit distribution across the different marketing channels when using different attribution models
Play with it
Free to tryMarketing
Ecomm Funnel Simulator
The Ecomm Funnel Simulator helps you to visualize how your revenue may change depending on the conversions happening at different stages of the user's journey when purchasing a product online.
Play with it
Free to tryPhysics
Projectile Motion
This simulation helps you to understand how projectile motion works by changing launch angle, launch speed, gravity, etc., and helps you see comparative projectile pathways based on these parameters.
Play with it
Subscription requiredChemistry
Afffect of temperature on States of Matter
This simulation models the impact of changing the temperature on the state of the matter from solid, liquid, gas.
Play with it
Subscription requiredEconomics
Understanding the evergreen principles of supply and demand in economics
This simulation lets you model supply and demand by varying different parameters.
Play with it
Free to tryEnvironment
Greenhouse Gases Impact temperature
Modelling the effect of greenhouse gases on our environmental temperature
Play with it
Free to tryFinance
Understanding Compound Interest
Model how wealth is created by the power of compound interest and experiment with different scenarios.
Play with it
Free to tryHealth
Modelling the flow Blood Sugar After Meal
This simulation helps you model the blood sugar in your body after a meal under various types of activity and sleep conditions . This simulation is purely illustrative.
Play with it
Subscription requiredHealth
Calories Activity & Weight Trends
This simulation models the impact of calories based on what you eat, on your weight, for different genders and in different conditions. This simulation is purely illustrative.
Play with it
Free to tryHealth
How Infections Spread in the human body
An interesting simulation of how the infection spreads under different conditions of isolation, mortality rate, recovery period, etc. This simulation is purely illustrative.
Play with it
Free to tryHealth
Immune Systems Training
This is a simulation of how our immune system gets trained to fight disease. This illustration is purely illustrative.
Play with it
Free to tryStockmarket
A simulation to show how standard stockmarket candles are formed
This simulation makes it very easy to understand the concept of stockmarket candles.
Play with it
Free to tryMarketing
CACn LTV CAC and LTV Modelling
This interactive demo shows how customer acquisition cost and lifetime value of a product can interact with each other and how sometimes a profitable product may also lead to bankruptcy.
Play with it
Free to tryMarketing
Facebook Organic Marketing Algorithm
This interactive demo lets you simulate Facebook's organic algorithm that helps in posts reaching larger audiences.
Play with it
Free to tryMarketing
Meta Andromeda Advertising Algorithm Simulator
A simulator to understand how Meta's new Andromeda algorithm works for Meta advertising
Play with it
Free to tryMarketing
Tool to classify the searcher's intent for search engines
You type a sentence, and based on specific words which are highlighted below, the tool tries to determine what the searcher intent is from one of the four displayed
Play with it
Free to tryWhy it sticks
Interactive isn't a gimmick. It's the whole method.
Understanding arrives when you can predict what happens next. That only comes from turning the knob yourself and being wrong a few times.
One tab, zero setup
No installs, no lab kit, no downloading a 400 MB simulator. Every simulation runs in the browser and resizes to whatever screen you opened it on.
Science and business, same shelf
Search ad auctions sit next to projectile motion. If a concept is easier to feel than to read about, it belongs in the library — whatever field it came from.
Made to be shown
Clean enough to project in a classroom or drop into a client call, and quick enough that nobody is watching a spinner while you explain the setup.
Three steps, about a minute
From 'I've read this before' to 'oh, that's what it does'.
- 1
Pick the fuzzy one
Filter by category, or just scan for the concept you've quietly been nodding along to for years.
- 2
Move something
Drag, launch, mix, bid. There is no wrong input — the wrong inputs are where most of the learning is.
- 3
Watch it click
The moment the output changes with your hand on the control is the moment it stops being something you memorized.
Limited-time beta
The whole library is free to try — for now.
No credit card. No countdown timer in the corner. Create a free account, open anything on the shelf, and keep playing for as long as the beta is open. Paid plans come later, and we'll say so well before they do.
Before you ask
The short answers.
Do I need an account just to look around?
No. Browsing the library and reading what each simulation covers is open to everyone. You need a free account to actually run one — that's how we keep them stable and work out what to build next.
How long does 'free to try' last?
The full library is open for the duration of the beta. When paid plans arrive we'll announce them well in advance rather than switching anything off overnight.
Will these work on a phone?
They run in any modern browser and scale to the screen. The denser ones — anything with several controls at once — are considerably happier on a laptop or a projector.
Can I use these to teach?
Yes. Project them, share the link, or hand the controls to whoever you're explaining it to. Letting someone else drive is usually the fastest route to the penny dropping.