Getting leggy, need more light most likely.

They look healthy. The ones on the right are ready to transplant into soil. IMO

What kind of grow light are they under?

You need to grab some full spectrum led bar lights and get those seedings some intense light. Sprouting tomato seeds from good sources and under humidity dome will give better results. Typically step them up into 4" pots then into 6", harden and then strip the foliage and transplant like a foot down...

Light! They are stretching out reaching for it, fall over and die. You need a better source. Get a good LED grow light, download the Photone app and see whats a good distance from your light source to the seedling.

As people have said, not enough light, but you might be able to rescue them by planting them in deeper compost. The tomatoes will root from the stem that is buried

Stronger light closer to the plant If your hand doesn’t feel te intensity of the light when hovering above the plant your lights are too high But if your hand is uncomfortable, its to close The leaves will curl up if the light is to intense

2-3 days of grow light and the stems have stiffened up and they are all standing up straight. 🤙🤝🙏