I am using chss.com app and enjoying it. Please try it.
Chess By Post

ChessByPost and the Chess.com app are the best apps for playing correspondence chess on iOS devices. http://chessskill.blogspot.com/2013/08/correspondence-chess-on-iphone.html.
I'm still rated well below my Chess.com rating on ChessByPost, partly because I lost three games, two of which featured opening blunders by my opponent followed by sloppy middlegame errors on my part. I expect that I will find the ratings inflated (if that concept makes any sense).

Evidence of rating inflation, or at least distortion. Ratings are always only relevant for a given pool, never across pools. While 1600 may mean understands the basic elements of strategy in one pool, it could mean total patzer in another. I'll go with the latter on Chess By Post.
In this game, Black was rated above 1600. Everyone over 1200 should know to play 8...Ke6.

@Ziriab,
very good attacks at f7
I use chess.com app and chess time app
Both are good
My request is love all

@Ziriab,
very good attacks at f7
I use chess.com app and chess time app
Both are good
My request is love all
I've one game going on Chess Time at the moment. I have a decisive advantage against the only opponent I have not yet beat (we have two prior draws). I don't like that the challenger always gets White. Chess Time is better than most, and the ratings seem less inflated (or at least it will take me many more games to climb over 1600, let alone any where close to my OTB rating). Chess Time is not as good, IMO, as Chess By Post, and no where near as good as Chess.com's app.

Hi all,
I'm trying to estimate the strength in FIDE (well, ECF, but FIDE I'll gladly take and do the conversion!) of a player - however, he has only really played on this app, with a rating hovering around 1900. I know there's no accurate correlation but a rough guess would be great!

This is an overly-complicated way of doing things. The easiest thing I think would be to simply go to tournaments and play. Then you could simply get his performance rating based off of his results without having to go through all this hypothetical stuff.

This is an overly-complicated way of doing things. The easiest thing I think would be to simply go to tournaments and play. Then you could simply get his performance rating based off of his results without having to go through all this hypothetical stuff.
That would give an accurate rating - but that's not my scenario. I have to provide estimated ratings for a number of ungraded players for an upcoming tournament. I'm only looking for a quick guess, to know where he should fit into my lineup (it's a team tournament). Someone who has used this app a lot and roughly knows the strength should be able to very quickly give a me a rough estimate, or a likely range.

Hi all,
I'm trying to estimate the strength in FIDE (well, ECF, but FIDE I'll gladly take and do the conversion!) of a player - however, he has only really played on this app, with a rating hovering around 1900. I know there's no accurate correlation but a rough guess would be great!
A 1900 rating on ChessByPost, if based on a large number of wins and losses, and hence established, likely translates to 1700 Online on Chess.com. FIDE 1400-1500.

Hi all,
I'm trying to estimate the strength in FIDE (well, ECF, but FIDE I'll gladly take and do the conversion!) of a player - however, he has only really played on this app, with a rating hovering around 1900. I know there's no accurate correlation but a rough guess would be great!
A 1900 rating on ChessByPost, if based on a large number of wins and losses, and hence established, likely translates to 1700 Online on Chess.com. FIDE 1400-1500.
Great, thanks very much!

I guess chess.com is quite good as long as your opponent is below 1800. You will not believe it that in shredder chess program my rating is 2100. But here in chess.com something really is very very unfair.

Hi I am playing an opponent who requested a draw and as I knew I could win refused it....... he is now calling me a cheat and says this game will now take months to complete

I think the ratings are very inflated. Started using the app a couple of months ago, after 36 games I have 31 wins and 5 losses, with a rating of 2215. However my OTB rating is 110 ecf and on chess.com I'm around 1450. If I was actually 2215 I would be close to an FM, clearly I'm not that as I have only been playing seriously for 2-3 years.
I am currently using the cross plattform app Chess by post and quite enjoying it :) I wonder if any of you people do the same?
I think that it´s great, and I particularly like that they use the ELO rating system and let users start on 1200 rating. But I have a question to you who use it:
Do you think that the rating is inflated? I am starting to think so. I have reached 1734 rating in a month and after winning my next game (which I will) I will have about 1760 rating.
Here on chess.com I should only be around 1500 in online and 1350 in standard live chess (time half an hour).
Finally, here is a link: http://www.jeffcole.org/chessbypost/