I would recomend tawk.to I use it on my sites, it's fairly simple and does what you are looking for.

Intercom is great.

thanks guys. much appreciated.

checking both of those out.

i can't lie. intercom looks sick.
just fairly expensive.

Drift.com is an alternative to Intercom

small.chat if you are using slack. Basic, fair and evolutive pricing, like it for MVP.

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awesome — working through the websites.

thanks