Whats the differnce with colour on the daily activity streak?

[blackwindzero]

I noticed that it’s been aqua lately. Sometimes it orange. What other visual identifiers/colours are there and what are the differences to get them or unlock them?

[sampearson]

It is related to your current streak of consecutive days using lingQ and the number of coins you have earned during that period.
Actually I didn’t know what the colours were about but it just so happened that an image explaining them was in Steve’s video today.