Bruno's pricing has changed recently, the lifetime offer is not available anymore. Prices tiers are: free, $6/month, $11/month [1]. Bruno's developers explained it was necessary to sustain Bruno's growth.
It's an http client... Itonically I think curl has grown to become so pervasive that it's common parlance to "curl something" to a large extent because haxx thankfully has a radically different approach.
[1]: https://www.usebruno.com/pricing