Is there a program\browser for ipad that emulates iphone\browser for iphone to test sites?

Question

iOS

There are some programs on the ipad that run in iPhone compatibility mode, have a low resolution. I would like to see a safari or other bowser in a similar form, or maybe some kind of iPhone inside an iPad in case of emergency.
The goal is to check responsive web design, I want to understand how the site looks and works on iPhones.
All web services - emulators are not suitable, because the fonts are rendered by my browser, everything can be ok for me, but everything can be bad on the device itself. Therefore, a different solution is needed.
Advise something, please, buy an iPhone while there is no desire, you need a way out of the situation.

Answer 1

In chrome, there is an emulator in the console and in firefox there is also (Ctrl + Shift + M) but this is just the width, although if you type it correctly, following all the rules, then just emulators are enough. iPhones have some differences, but they are scanty.

Answer 2

XCode + iOS Simulator

Answer 3

www.responsinator.com