See What Insulin Actually Does.
Interactive tools that let you change a dose, a meal, or a workout and watch the curve respond.
Insulin action is invisible.
You dose, you wait, you hope you got it right. Most people with type 1 diabetes learn what actually happens through years of trial and error, some of it unpleasant.
Our simulators let you skip some of that. Interactive tools that let you change a variable — a dose, a meal, a workout — and watch the curve respond. No account, no download, no cost. A way to build intuition about what’s happening inside your body without having to live through every version of it first.
Use them to prepare for something new, to make sense of something that already happened, or to explain your diabetes to someone who’s never had to think about it.
Understanding Insulin Types
Start here — get to know the insulins themselves: how fast each one starts, peaks, and fades.
Understanding Meal Boluses
Now line that insulin up with food, where when you dose matters as much as how much.
Understanding Exercise Management
Add movement, which shifts both your blood sugar and the insulin already working.
Exercise Timing Simulator
See how a workout lowers blood sugar — and how timing it around Rapid-Acting insulin changes the drop.
Open simulatorTemp Basal Simulator
On a pump delivering Rapid-Acting insulin? Find out how far ahead to lower your basal for a workout.
Open simulatorExtended Exercise Simulator
Fuel and dose Rapid-Acting insulin for long efforts of 4+ hours, start through recovery.
Open simulatorAnaerobic Exercise Simulator
Why sprints and heavy lifts push blood sugar up, then down hours later, with Rapid-Acting insulin on board.
Open simulatorDIY Simulator
Put it all together across a full day.
These are free because people fund them. If they’ve been useful, you can help us build more. Support BCF.