Tool to monitor relative strength / weakness of two altcoins

[dudbits]

Hi,

Fairly new to Crypto and trading.

Bought and sold a few alts this last couple of months to create a portfolio.

In this volatile market I’m looking for a tool that can help me understand the relative value of one alt to another over time, priced in bitcoin… essentially the spread between the two over time (priced daily, hourly etc.)

For example something that could graph say XRP against Stellar showing the difference (unit, percentage) in bitcoin between the two.

Something like this would be useful to help understand when to trade out of one and into another (via bitcoin of course, understand there could be fluctuation between intermediate trades).

Does anyone know of such a tool?

Thanks