> ## Documentation Index
> Fetch the complete documentation index at: https://docs.isofold.com/llms.txt
> Use this file to discover all available pages before exploring further.

# How Billing Works

> Understand Isofold’s pricing model and how savings are calculated.

## Isofold Pricing Model

Isofold charges based on **query cost savings**. You only pay when we reduce your warehouse bill—nothing else.

* **No per-seat fees**
* **No flat subscription required**
* **Only pay a percentage of verified savings**

***

## Example

Let’s say you run a query through Isofold that originally costs \$1.20 and the optimized version costs \$0.80. That’s a savings of \$0.40.

If your team’s plan charges 30% of savings:

```text theme={null}
$0.40 saved × 30% = $0.12 charged
```

The rest stays in your pocket.

***

## Supported Warehouses

| Warehouse | Pricing Support            | Notes                            |
| --------- | -------------------------- | -------------------------------- |
| BigQuery  | Full (via dry-run)         | Exact byte-level cost estimation |
| Snowflake | Partial (compute inferred) | Slot time used as proxy for cost |
| Aurora    | Optional                   | Based on CPU/memory if enabled   |

***

## Cost Estimation

Isofold computes cost savings in one of two ways:

### BigQuery

* Uses **dry-run** mode to compute byte scan and estimated slot time
* Runs both original and rewritten queries without execution
* Supports per-query diff and cost breakdown

```bash theme={null}
export ISOFOLD_ESTIMATE_MODE=bigquery
```

### Other Warehouses

* Uses rewrite diff heuristics (column count, filters, joins removed)
* Optionally integrates with warehouse-specific billing APIs
* Tracks compute time and latency as proxy for cost

***

## Billing Frequency

Billing is computed and invoiced:

* **Monthly** by default
* With per-team or per-environment breakdowns
* Via Stripe or custom invoicing for enterprise

You can access live and historical savings via the [dashboard](https://app.isofold.com).

***

## Free Tier

All accounts include:

* **10 free optimized queries per month**
* Unlimited dashboards and integrations
* Email support

Upgrade anytime to unlock higher volume and custom rewrite logic.

***

Next: Explore available [Pricing Plans](/billing/pricing)