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Check out the app called "Tweek". Its exactly what you described here with very little extra fluff.

lbittneron Show HN: Probably the Most Flexible Flight Ticket Search Engine

Looks really cool! I'll definitely use this next time I'm looking for flights or just want to go somewhere random for cheap.

One bug(?) I found is that the return flights don't seem to be departing from the city I am travelling to. For example, it's showing me flights that go from X > Y, but then the return flight is Z > X instead of Y > X.

lbittneron Ask HN: What non-AI products are you working on?

I'm working on a super simple way to monitor your API at an endpoint level - https://subbul.com/.

At work we spent a bunch of time implementing monitoring and alerting for all our APIs and I figured it would be nice to have a near plug-and-play solution, so I built exactly that.

lbittneron Stop paying DocuSign $2 for an e-signature

I work for a large PDF processing company (not Adobe) and true digital signatures are a bit more complex than that. Docusign actually uses our technology in their signing flow and it is a bit more complex than what you are describing.

A true digital signature ensures that the document is not altered after the document is signed. This is done by creating a hash of the document, encrypting it using a private key provided by a signing authority, and embedding that in a certificate that is then attached to the document.

When opening the signed document (in Adobe reader for example), the hash in the certificate is validated using a public key provided by the signing authority. If the document hash matches the certificate hash, then the document has not been altered!