Trymyapps and Freemyapps are both platforms to boost developers apps to a prior position and make them visible for more users in App store. They are owned by different companies but have similar functions. I call them opponents and leagues. Because they all work to attract more developers for iPhone, iPod, iPad and Android users. But their philosophy is the same to make developers apps popular. Below is my summary for these two applications:

Opponents:
1, Website Vs App
TMA: Users directly download trymyapps application and install it on mobile devices(iPhone&iPod&iPad)
FMA: Directly search the home page on Safari(iPhone&iPod&iPad&Android)

Registration process:
TMA: Need users to register by simply inputting email address and password, no confirmation is needed
FMA: Detect and aind users mobile devices without registering

Task-completing steps:
TMA: Click【accept】--copy keyword--paste keyword at app store--organic search correct app and install according to the information provided at Trymyapps task page
FMA: Click[download]--directly jump to app download page--install and open to run

Rewards per task:
TMA: $0.4 for main task+$0.1 for follow-up tasks per app
FMA: Different credits depend on different apps like 5credits, 30 credits, 100credits... 300 credits can redeem $1 Amazon gift card

Rewards redeemption:
TMA: Directly provide with real cash or by redeeming itunes gift card
FMA: Provid with all kinds of gift cards&game cards

Withdraw or redeem:
TMA: Use Paypal account or Alipay account to withdraw. Withdrawal amount is 1st time $1, 2nd $3, 3rd, 4th ...$5, also provide with itunes gift card
FMA: Minimum credit to redeem is 300 and get one $1 Amazon gift card...3000credits to redeem to get one $10 Google Play gift card.

Leagues:
Function: Help developers to boost their app rankings in app store
Pros and cons: Search and install can bring organic traffice for an app while directly guided to the downloading page can only increase download amount.