I personally find it useful for more than recruiting, such as sales etc. Shaving a few minutes off finding an email compounded over a day can save quite a bit of time allowing you to focus on more important things.

It's true emails are not very difficult to find on GitHub, but the point (as mentioned by saasinator) is to reduce the amount of time you spend doing such activities. Time is money and there are many professions where people spend a lot of time finding leads or prospects to cold email. We're trying to make it less time consuming.

That's a good point-- I don't think we do a good job expressing what we do different on our landing page. I believe our core difference is our data quality.

A lot of these products will try permutations or combinations of the user's name and use a few methods to determine if those emails are taken and they "assume" that email belongs to the user.

Nymeria doesn't assume or guess. We have over 200 million email addresses tied directly to users, they are not a guesses.

Do you have an api?

We're not open source at this time but if there's a large demand we may consider open sourcing part of the product (such as the extension's code).