# Downloading candidates

### Overview

Once you've reviewed a layout candidate, you can download it for offline inspection. To download a candidate for offline review, click the "download" button at the bottom right of the candidate preview pane. 

Layout candidates are always returned in their original native file format, making it easy to inspect and review them offline. This way, you can:

* Run your own design rule checks (DRCs)
* Validate the design with simulation
* Send the design to colleagues for feedback and approval

<figure><img src="/files/HMTWNODoIebgMIIMcGQG" alt=""><figcaption><p>Click the button to download your layout candidate</p></figcaption></figure>

### How billing works

Quilter's billing unit is called a "pin". This corresponds directly to the number of pins listed in the input files used to set up a layout job. Quilter customers buy "pin" allotments, which they can use to access the layout candidates created by a job.&#x20;

Submitting, reviewing, and revising layout jobs in Quilter is free. Customers only get billed for "pins" when they download one or more candidates from a job.

When you download a candidate, your pin allotment decreases by the number of pins in the input file for your design. For example, if your input board file has 1,000 pins, you'll use 1,000 pins when you purchase the first candidate from your layout job.&#x20;

{% hint style="success" %}
**Only pay for boards you approve.** \
Layout jobs are billable only if you download one or more candidates. Downloading a single candidate from a job gives you access to all of them at no additional cost.
{% endhint %}

### Purchased layout jobs

Quilter simplifies finding and identifying layout jobs you've purchased:

* **"Downloaded" filter**\
  On the home page, click the "Downloaded" filter to view your purchased layout jobs
* **"Downloaded" icon**\
  Any downloaded layout jobs will show a "Downloaded" icon next to the job name, indicating you can't download them again.

<figure><img src="/files/iylJUs8OtOkX0AhV2RdC" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/L18kZZbDxpzIMZYsVw3f" alt=""><figcaption></figcaption></figure>


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