Documents
Google Docs
Replice works only in the document where you open it. Searching and replacing run inside Google Docs; Zecro does not receive document text.
The free add-on has no usage limits. Pro is a one-time purchase sold by Zecro LLC through Payhip, not by Google.
Independent of Google. Google Docs is a trademark of Google LLC.
No public apps yet
Nothing from Zecro is listed for Google Docs today. The directory of what is shipping is on the apps page.