I work for a foundation/waterproofing company.

I have some hairline cracks in my driveway (exposed aggregate finish). What can i seal the cracks with that won't standout like a sore thumb? Is there clear sealant for this type situation?

I would need to see pictures of your cracks. In our situation we usually recommend a poly foam injection to fill the void, compact the soil below, and raise any drop in the slab. If any mitigating factors like water intrusion under the slab is occuring, divert that water away.

Think of it like a differential settling house. You can fix cracks, but if you don't get to the root cause, it's just temporary.

Point being, don't concern yourself with the cosmetic fix until the root cause is alleviated.

I’m pretty sure every driveway in the world has cracks in it

What's your opinion on helical piers?

Long term fix? Or temporary solution?

Did you fix your runoff issue? I wouldn’t do anything until you do that

hairline cracks, no drop at all. Just want to keep the water out, so no drops develop over the years.

And.... crickets

Some masonry supply houses sell driveway crack caulking that’s self leveling. Just clean the area real well before you do that fyi

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Part of my driveway is washing out due to runoff from the house. What can I do to fill this gap? New concrete, dirt or is there a pray foam I can use?

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You can most definitely do a poly foam application. It will compact the soil, fill the void, and lift if needed.

Do you have gutters?

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What's your opinion on helical piers?

Long term fix? Or temporary solution?

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If done correctly, permanent at that location. As with anything, it's only as good as the install. If they hit load bearing strata and properly cut/bracket the footing, it's gold.

If I were building a house, I would do helicals prior to the footing being poured. Pre construction piers are worth every penny.