This app was mentioned in 12 comments, with an average of 1.25 upvotes
no there are mobile apps like 10 different ones. not a original idea. here is the best one https://play.google.com/store/apps/details?id=com.saranomy.minecraftcircle&hl=en exactly the same as your just difernt color and yours dosnt have the lines to center it. so most likly poeple in review will hate it for being so close to the other one
While someone suggested an SE specific circle guide generator, heres a more general one that is helpful pretty much anywhere.
https://play.google.com/store/apps/details?id=com.saranomy.minecraftcircle
Its an interesting idea. Maybe you could go along with the design of the barrel item but make it round? There is an app which creates circles for you if you don't know how to build them ( app ).
To get pollution done, you can place random blocks in the water around it, and even corals close to the barrels walls to create a look that it has been there for a long time. And also put sand and gravel high around the walls so it is kinda buried into the seafloor.
Looks good, few problems its a bit too tall in comparison to the house also its not very round https://play.google.com/store/apps/details?id=com.saranomy.minecraftcircle I use this app alot to help get perfect circles I highly recommend it
I personally use an app called "Circle for Minecraft." You can use size (diameter) or radius (using 10 for example, it would give you either a 10x10 or 21x21 circle), ranging from 0-999
I don't know if it's on iOS, but if not, there's probably an equivalent app
There's some really good android apps for this as well.
This is my favorite
https://play.google.com/store/apps/details?id=com.saranomy.minecraftcircle
This will help you https://play.google.com/store/apps/details?id=com.saranomy.minecraftcircle
Download this app.
There's an app for that:
https://play.google.com/store/apps/details?id=com.saranomy.minecraftcircle