Run a preview
Open a template in Design Studio and click the device icon in the toolbar. Previews render whatever is in the editor right now, including unpublished changes. Choose a target set, which is the group of clients you want to render on. Every workspace starts with Courier Recommended, an 8-client set spanning desktop, mobile, and webmail in both light and dark mode. You can also build your own from the full catalog of 96 clients. If your template is localized, choose which translation to render, and set test values for any variables such asprofile.name. Variables left empty render as written, which is a common reason a preview looks broken.
Click Run preview. Screenshots load as they come back, and some clients take longer than others. A full run takes 10 to 60 seconds depending on how many clients you picked.
Review the results
Click a screenshot to open it full size, then use the arrows to move through the run. Each one shows the full inbox view, so you can check the subject line and sender name along with the email. Download any screenshot from the results page.Find past runs
Click Preview history for past runs. Each one shows when it ran, how many clients it covered, and which template version was live at the time. That last part tells you whether a rendering problem is new or shipped several versions ago. Runs are kept for 1 year.Build a target set
Create your own target sets to focus on the variations you care about. You might keep one for Outlook versions, another for dark mode across mobile, and a third for the clients most of your users are on. Open the Targets dropdown and click Create new set. Name it, filter the catalog by Mobile, Web, or Application, then add the clients you want. Use the pencil icon to edit a set later. Sets are shared with your workspace and scoped to the environment you are in.Pricing
Device Preview is a paid monthly add-on. Enable it in Settings, under Billing. One preview is one client screenshot, so a run against the 8-client Courier Recommended set uses 8. Each plan includes a set number of previews per month, and anything beyond that is billed per preview. Included previews reset each month and don’t roll over.Supported clients
Device Preview covers 96 clients across 21 apps. A client is one combination of app, device, OS, browser, and color mode. New devices and OS versions are added over time.Desktop applications
Mobile applications
Webmail
What’s next
Test with sample data
Preview with test data and send test messages from the designer.
AI Translation
Add locales, then preview each translation on real devices.