Drawing a perfect heart shape with Inkscape is not difficult.

1. Draw a rectangle
2. Round it at the top (but not bottom)
3. Duplicate it, rotate 90degrees and then combine

It is easier if you see this, I actually made a video of this: https://youtu.be/DDIFPkQS8Q0

ChatGPT suggested me to do it differently. Basically it suggests to combine two circles and a triangle.

It is true that this can be done, but I did not not find that easy.

Also, I wonder, is there a way to round only the top of a rectangle?

Here´s my lazy attempt:

Check out this from 12 years ago:

https://alpha.inkscape.org/vectors/www.inkscapeforum.com/viewtopic277b.html?f=6&t=12951#p49010

Gijsbert

Also, I wonder, is there a way to round only the top of a rectangle?

Maybe like so:

@Polygon I agree that your solution with the line and then make the stroke really thick and rounded endpoints is best. The allows one to later adjust the heart shape. Important is to make sure to use node alignments to distribute the three points with equal distance and align the two top points.

The rounding of the top is not good, because if you pull the handles down further, it does not stop in the middle and you get a weird shape. I think that is possibly a bug in Inkscape?

Here's another method.