> For the complete documentation index, see [llms.txt](https://docs.nalpeiron.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.nalpeiron.com/zenmeter-docs/zenmeter-overview/zenmeter-quick-overview.md).

# Zenmeter Quick Overview

**Zenmeter has been designed to be lightweight, fast to deploy and set up, and easy to connect to billing systems like Stripe.**

Zenmeter is a subscription-based system for managing usage and limits.

It’s designed for products where:

* A customer has one main subscription
* They can buy add-ons on top
* They can have multiple users
* They consume usage-based features over time

### Zenmeter is built around subscriptions

> Everything runs inside a single subscription.

That subscription is the source of truth for:

* Users
* Features
* Add-ons
* Usage balances

Product owners set up products, pricing, and usage rules in a configuration step.

At runtime, each customer has one main subscription that controls everything.

#### That subscription:

* Holds the features the customer can use
* Includes any add-ons they’ve purchased
* Tracks users on the account
* Manages usage balances (like credits or limits)

#### When a feature is used:

* Zenmeter looks up the correct meter and rate
* Deducts usage from the right balance
* Logs the action for audit and reporting

Add-ons don’t create a separate system—they simply extend the main subscription.


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