Based on our record, Heavens Above seems to be more popular. It has been mentiond 4 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
The Heavens Above site will give predictions of satellite passes based on location and time, and will predict brightness as well. For example, here's a guess at the 501 location for last night (you might have to set the date yourself). Looks like the SL-16 R/B satellite or the Resurs 01 rocket stage are good candidates; they're about the right time and direction. If you knew time, location, and/or direction more... Source: 11 months ago
Heavens-Above (multiple platforms, lists satellites). Source: over 2 years ago
Also worth noting: https://heavens-above.com/main.aspx But this has a much nicer UI/UX! The street view rendering is particularly impressive. - Source: Hacker News / about 3 years ago
I have seen planes where they look like just flashes of lights until you get into a really dark place and can see the lights that are always on. I think they fly at higher altitudes for faster, more efficient travel. There are a couple of ways to check into this, though. Heavens-Above tracks satellites and flightradar24 has a playback function for times going back a week. Source: about 3 years ago
Satscape - A satellite tracking program for Windows, Mac OS and Linux.
See A Satellite Tonight - Free web app to explore satellite locations.
Celestia - Real-time 3D visualization of space
ISS Detector - Tracking the International Space Station. See it fly by.
Uphere.space - Realtime tracking and prediction for thousands of satellites
Stellarium Portable - Stellarium Portable is software that you can use to observe the universe in a virtual 3D space.