|Stackmob||1M||∞||Amazon S3 5GB||200/day||∞|
|App42||1M||1M||1GB limit, 1GB/month||?||∞|
|GoInstant||-||?||2GB (imit 10GB transfer)||?||100
|Firebase||-||?||100 MB Data (imit 5GB transfer)
1GB Hosting (limit 100GB transfer)
I will collect all BaaS here for reference and compare, I did try all of them and my suggestion (for now) is Parse.com which is just has been take over by Facebook after I try it for 2 days ;p
The good thing for this all services is they all support REST/RESTful API and JSON which really mean Flash/AIR dude can be use their API without any headache.
And like always, any suggestion for other competitor is open and welcome! :)
PS : I'll try keep this table comparison accurate as possible, but for real life use please recheck for pricing plan at service provider page.
UPDATE 1 : as Nick Collins mention, I just add backendless to the list, if you didn't push notification that much and want minor adjust for each $ you spend, this one is perfect for you :)
UPDATE 2 : Thanks Morgan Bickle for correction via comment below, Kinvey has "unlimited" storage for free, so it's a good time for us to fill it up though! ;)
UPDATE 3 : Thanks Mark Piller for clarify and Philipp Schäfer for info, i just add apiOmat to the list, they limit on 3 modules didn't say anyway they have limited to use...
UPDATE 4 : App42 has Flash support! @see Push Notification in Flash, but it only FREE for 3 Months for Non-Indie Developers.(Any individual or a studio with yearly revenue (turn-over) less than $100 K.)
UPDATE 5 : netmera is look really promising, i'm now using Parse but really tempting much more push notification features from them.