Saving & Sharing

Your work saves automatically. Share simulations with a link, embed them in websites, or remix others' work.

Saving & Autosave

When signed in, your work saves automatically. New simulations save after 5 seconds of inactivity, and subsequent changes save every 15 seconds. You'll see "Saving..." briefly appear in the header when autosave runs. There's no need to manually save—just build your model and everything persists.

On first save, you'll add a title, description, and icon.

Local drafts

Not signed in? Your work is stored in your browser and restored when you return. Sign in to save permanently and access your simulations from any device.

View-Only Mode

Creating and editing simulations is only possible on desktop. On mobile and touch devices, you're in view-only mode and can explore models, run simulations, and inspect results.

When viewing someone else's simulation or browsing templates on desktop, you're also in view-only mode. You can explore the model, run simulations, and inspect the results, but you can't make changes until you remix.

Embedding

Embed simulations in websites, blogs, or documentation using an iframe. Copy the embed code from the share dialog.

Embeds always show your latest saved version. Any changes you make will automatically appear in all existing embeds once saved.

Embed API

Make your embedded simulations interactive by enabling parameter overrides. Embedders can pass URL parameters to customize the simulation inputs.

Enabling parameter overrides

In the Share dialog's Embed tab, toggle Enable parameter overrides. The embed code will include all overridable parameters with their default values.

Parameter naming

Parameters use the block's variable name. For Constant blocks, use the variable name directly. For Variable blocks (distributions), append the distribution parameter with an underscore:

embed-params.js

javascript

1class>=class>="text-[#ce9178]">"text-[#6a9955]">>// Constant block with variableName=class>="text-[#ce9178]">"interest_rate">>
2const> params = new> URLSearchParams(>);
3params.set(>class>="text-[#ce9178]">'interest_rate'>, class>="text-[#ce9178]">'0.05>'>);
4
5class>=class>="text-[#ce9178]">"text-[#6a9955]">>// Normal distribution with variableName=class>="text-[#ce9178]">"returns">>
6params.set(>class>="text-[#ce9178]">'returns_mean'>, class>="text-[#ce9178]">'0.08>'>);
7params.set(>class>="text-[#ce9178]">'returns_std'>, class>="text-[#ce9178]">'0.15>'>);
8
9class>=class>="text-[#ce9178]">"text-[#6a9955]">>// Triangular distribution with variableName=class>="text-[#ce9178]">"growth">>
10params.set(>class>="text-[#ce9178]">'growth_min'>, class>="text-[#ce9178]">'0.02>'>);
11params.set(>class>="text-[#ce9178]">'growth_mode'>, class>="text-[#ce9178]">'0.04>'>);
12params.set(>class>="text-[#ce9178]">'growth_max'>, class>="text-[#ce9178]">'0.08>'>);
13
14iframe.src = class>="text-[#ce9178]">`/embed/your-sim?${params.toString(>)}`>;

Auto-run on load

Toggle Auto-run on load to automatically run the simulation when the embed loads. This is useful when you want viewers to immediately see results instead of the model diagram.

autorun.js

javascript

1class>=class>="text-[#ce9178]">"text-[#6a9955]">>// Add autorun=1> to run immediately on load>
2iframe.src = class>="text-[#ce9178]">'/embed/your-sim?autorun=1>'>;
3
4class>=class>="text-[#ce9178]">"text-[#6a9955]">>// Combine with parameter overrides>
5iframe.src = class>="text-[#ce9178]">'/embed/your-sim?autorun=1>&interest_rate=0.05>&returns_mean=0.08>'>;

Use cases

Parameter overrides enable powerful integrations:

Connect sliders or inputs on your page to update the iframe dynamically
Pre-populate with user-specific data from your application
Create multiple embeds with different scenarios from a single simulation
Build interactive calculators powered by Monte Carlo simulation

Remixing

Create your own copy of any public simulation by clicking the Remix button in the header. Your remixed version becomes an independent simulation that you own and can modify freely.

If you try to edit a block in view-only mode, you'll be prompted to remix the simulation first. This protects the original creator's work while giving you full freedom to experiment with your own copy.

Templates

When you open a template and click Remix, Carlo creates a copy for you. Your changes save to your own simulation, leaving the original template unchanged.

Attribution

Remixes link back to the original simulation, giving credit to the creator. Creators can see their remix count, helping track the impact of their work.