# Features

Our [backlog tools](https://help.avion.io/docs/integrations/backlog-tools) section gives a great overview of the shared features across all our integrations. This page focuses on the specific features of our Trello integration.

Avion offers a flexible and extensive two-way sync integration with Trello. This supports configurable options to allow you to tailor the experience to your needs and help you find the right balance within your team.

* **Two-way sync of data** — from Avion to Trello and back
* **Story state mapping** — [advanced mapping](https://help.avion.io/docs/integrations/backlog-tools/set-up-an-integration/map-story-states) of story states to Trello columns
* **Sync releases** — track your releases via Trello labels
* **Sync backbone and size data** — optional custom field mappings for Avion meta data
* **Supports tags** — optionally sync your Avion tags

### Available mappings

You have a variety of choices of what to sync. Currently we support syncing the following items:

| Avion              | Trello            |
| ------------------ | ----------------- |
| Story title        | Title field       |
| Story description  | Description field |
| Story size         | Custom field¹     |
| Story state        | Board column      |
| Journeys and steps | Custom field¹     |
| Release            | Label             |
| Tags               | Labels¹           |
| Attachments        | Attachments²      |

<pre data-overflow="wrap"><code><strong>¹ Optional.
</strong>
² Syncing attachments is optional. Attachments are one-way synced, with Avion as the source.
</code></pre>