Hey HN! co-founder here. It feels incredible to be sharing Replay with all of you. It's been a labor of love the past five years!

Replay started off as a simple experiment in what would happen if we added a step back button and rewind button to the Debugger. We quickly realized two things. First, nobody uses breakpoints. Second, being able to share is so much more powerful than being able to rewind.

Here’s how Replay works today. Somebody on the team records a bug with the Replay Browser and shares the replay url with the team. From there, developers jump in and add print statements. The logs appear in the Console immediately so you don’t need to refresh and reproduce a thing.

Over the past year we’ve talked to hundreds of users, recorded 2.5 million replays, and worked incredibly hard to ensure Replay would be fast, secure, and robust from the get go.