John Jones - if you have NAR membership, NARRPR can help you create free market analysis - you can pick your comparable sales. And yes, you can do it for ALL the states, to best of my knowledge.

Our MLS also provides us with the same - though its local.

Parked and reading. 

I have seen a few that are very close, but do not remember where, they were not on the Z.

Most of CMA is way way off.   I do a customized CMA with adjustment.  Most sellers are sophisticated and they have  a fixed price in mind, often way way over,

An online CMA is useless information. Only a local realtor who knows the area and the specifics of a property can give the homeowner useful information in the form of an accurate CMA.

Our MLS offers a template for us to use.  No national site can compete because they don't know specific neighborhoods - for example, one that is full-brick on larger lots can be within 1/4 mile of one that is a sea of vinyl on postage stamp lots.  They compare the two on the national sites - we know better!

Zillow!  LOL!!!  But seriously, RPR if you can stomach it can do it.  It's free through NAR and I'm pretty sure Riverside forces you into that group like my association does.

You just need to know what you're doing in those markets.  The ability to comp in Bumforge Idaho isn't going to be helpful if you don't know what side of the street is sewer vs. septic or local stigma.

Why would you need acces to all 50 states? There is no way you could represent a client across the country with any competency...

I use a template that I fill in.  I've yet to see one that is even remotely accurate or that has enough information to explain the factors that determine a good listing price.

NAR RPR

RPR ... it is an amazing tool ... this is provided by NAR. 

John Jones You can generate good CMA from local MLS, and NARRPR.

Your MLS will typically provide you a free customized link that your customers can use to request CMA. NTREIS in Texas uses CloudCMA for providing this capability to real estate agents. This service is free in Texas. Other MLSs may charge for similar services. 

I always do my own CMA

I use RPR along with my local mls.

Glad I stopped by to view so many great suggestions!

John Jones Take a look at Praful Thakkar 's answer.

I do my own for registered visitors that request it

I would not do CMAs for areas that I am not familiar with. When I do comps for my markt area I know the area so can make adjustments .

We have RPR on our MLS and it is nearly spot-on in results against CMAs that I complete by the conventional method.

I don't believe there's any such animal.  The closest may be the Realtor Property Resource.

RPR might be able to help nationally. Instant CMA report surrounding the address.

I use the Cloud CMA locally for free 'what's my home worth stuff' so I'm not sure which you really need.

Sam Shueh nailed this one!

Blog about your selection.

I am not familiar with any automatic system that does free , good CMAs.

My MLS offers few free tools for agents ( cloud CMA, RPR). They are really good.

I haven't seen a good one, John. My CMA is worth the investment.

John,

I am looking forward to what others have to say.  A