There are a lot of heavy-duty portfolio analysis tools out there, but what I'm looking for is (I think) much simpler. I simply want to:

* Enter a ticker symbol (could be mutual fund or ETF), along with a percentage
* The percentages for all symbols will add up to 100%
* Enter a start and end date, and see the total returns (CAGR) for that period.

For this particular analysis I'm not interested in adding particular buy/sell transactions, I just want to see the CAGR for a portfolio for a particular period.

Surely such a tool exists, but I haven't been able to find it yet, perhaps because I'm searching for the wrong terms? I've been looking at a lot of tools that pitch themselves as offering "Portfolio Analysis" or "What-if analysis," but either I haven't figured out how to use them properly, or they don't offer this.

Does such a tool exist?