Yes, Final Draft 13 and 12 support the desktop Grammarly© client. If you have the free or premium version of Grammarly installed and running on your computer and you open FD, you'll see the Grammarly widget on your screen. Use Grammarly in Final Draft the same way you would in any other program.
NOTE that you need Final Draft 12.0.7 or later installed to use Grammarly. If you're not sure which version of FD12 you have, open FD, go to the Help menu and choose Check for Updates. If an update is available, follow the prompts to install the new version.
For information on upgrading to Final Draft 13, click HERE.
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