Amazing but Opaque
TL;DR: an amazing UI with pretty good features… however, lacks transparency. Quetta easily has one of the best UIs I've seen on a mobile web browser, with inspirations from Chrome and Safari, in a visionOS-inspired super modern design. It is very intuitive to use and pretty snappy. My only pet peeve is that the refresh button is not permanently in the address bar, but otherwise it is surprisingly good in terms of interface. Similar story in terms of features, where Quetta also shines. Although the iOS version does not support Chrome-based extensions (yet), unlike Kagi's Orion, its “Playlist” feature is surprisingly innovative and makes it an astounding browser for media consumption, including offline! Its ad-blocker also seems to perform very well, especially on a certain video platform that currently cracksdown on their use. Speaking of which, PiP and background playback work pretty well, and the settings panel is very complete. As for the rest, it is pretty standard, but the developer promises is more to come and I'm impatient to see that. There isn't any of these “AI” features that are currently being overhyped everywhere, which some users may dislike, but I personally don't care that much. That being said, we have to address the elephant in the room: transparency. A good browser is a browser that you can trust… and unfortunately for me, Quetta isn't there (yet). The developers need to urgently open-source their entire code, as promised, instead of pushing away the deadline. I have read allegations that the application was developed in China even though the company is registered in the UK, which is a little bit suspicious to me by default. Using Apple's Privacy Report feature on my iPhone, I have noticed that the app seems to connect to a lot of “Quetta.net” addresses (including an address marked as proxy). In all fairness, pings are pretty standard for a browser, and there is no evidence that sensitive is being sent to these addresses… but there is also no evidence that sensitive data is NOT being sent. Some privacy features, such as the allegedly end-to-end-encrypted “Quetta Pass”, are amazingly innovative, and should be more common in the industry. But, in the absence of certainty that no backdoor exists, this is still way too opaque for me to be trusted. In overall, Quetta looks very promising in many ways, especially when it comes to UI… but its lack of transparency, compels me not to use it until the code is made open-source in its entirety,