DidTheyReadIt

DidTheyReadIt offers invisible email tracking to notify users when their emails are opened. In practice that means building software for you when nothing off the shelf fits.

It makes the most sense for companies with a specific process to automate. Related areas on their profile: Email. As a small company team themselves (11 to 50 people), they tend to serve customers of a similar scale best. You will probably talk to the people who build it, which is great until you need 24/7 support.

DidTheyReadIt is based in Houston, Texas. You can read more at didtheyreadit.com.

Things worth asking about: portfolio relevance, who owns the code, and how they handle changes. Ask for a trial on your own data, not a canned demo.

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