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

# Tag Explorer

> Analyse cloud spend by resource tag across all connected providers. Available on Professional and above.

<Info>
  Tag Explorer is available on **Professional, Business, and Enterprise** plans.
</Info>

## Overview

The Tag Explorer lets you break down cloud spend by any resource tag key and see which tag values are driving cost. It works across all connected providers — you can see how much your `team=payments` resources cost across AWS, Azure, and GCP combined, without exporting CSVs or writing queries.

## Selecting an Account

Use the account switcher in the top navigation to scope the Tag Explorer to a specific connected account. Tag keys and values are fetched for the selected account and provider.

## Browsing Tag Keys

The left panel lists all tag keys detected on the selected account. Click a key to load the cost breakdown for that key — for example, selecting `env` shows total spend for `env=production`, `env=staging`, `env=dev`, and any untagged resources.

## Cost Breakdown

For each tag key, Cost Optix shows:

* **Tag value** — the specific value (e.g. `production`)
* **Total cost** — spend attributed to resources with that tag value in the selected period
* **Percentage** — share of total spend for that key
* **Untagged cost** — spend from resources that have no value for this tag key

## How Tag Data Is Fetched

Tag data loads in two phases to keep the interface fast:

1. **Phase 1 — on page load:** Tag keys are synced from the provider's API. For Azure this uses the Consumption Tags API; for AWS and GCP, keys are read from the local tag aggregates table.

2. **Phase 2 — on demand:** When you select a tag key, Cost Optix fetches the cost breakdown for that specific key. For Azure this calls the Usage Details API scoped to the key. For GCP it runs a BigQuery UNNEST query over the billing export dataset.

This means the initial page load is always fast, and detailed cost data is only fetched when you need it.

## Date Range

Use the date picker to select a time window. Presets include last 7 days, last 30 days, this month, and last month. Custom date ranges are also supported.

## Drilling into Resources

Click a tag value to see the individual resources tagged with that value — resource name, resource ID, resource group (Azure), type, and location. Filter and search within the resource list, and paginate through large result sets.

## Exporting

Both the cost breakdown and the resource list can be exported to CSV using the **Export** button in each view.

## Untagged Resources

Cost Optix surfaces untagged spend alongside tagged spend. Resources with no value for the selected tag key appear in the **Untagged** row. This helps identify resources missing tags that are hard to attribute to a team or project.

## Tag-Scoped Budgets

Tag keys and values from the Tag Explorer can be used as filters when creating a budget, so you can track spend for a specific tag combination against a budget limit. See [Budgets](/features/budgets#tag-scoped-budgets) for details.