If you could post a picture, someone might be able to help you! Short text descriptions of insects rarely provide enough information to even know where to look!

Also, what gardening zone are you in? (Add in personal profile information.) It might be relevant to the insects in your area.

My pics are not great as it moves very fast. LOL
I live in zone 7b South Carolina
It changes color from red to yellowish/green depending on the light.
It is on every plant from potatoes, squash to sunflowers.

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I am sure someone knows the name, but I recognize it as the same or very similar to what I see on plants all the time, at least in summer.

I regard them as harmless.

I'll bet it's a Long-Legged Fly, a good guy! (Thanks to bella_trix.) It looks like the insect I've seen on several different vegetable plants. Below is the discussion where I asked about it and posted pictures similar to yours.

Here is a link that might be useful: Long-legged fly

Thanks!
I am now glad I have lots of them!

I have these in my strawberry patch. Glad to know what they are and what they do!