Hi @Matt_Petersen
The only way to tell (if you use Airtable forms) is to look at the revision history in Expanded view - you would see this:
![Screen Shot 2017-11-16 at 17.01.34.png Screen Shot 2017-11-16 at 17.01.34.png](/t5/image/serverpage/image-id/8926i74265097AFBEC694/image-size/large?v=v2&px=999)
If you chose an external form (connected with Zapier) then you could set a field value (maybe a Single Select) to show it was captured online.
Hope this helps!