RateMe.js

function RateMe(ios_url, goog_url, usecount) {
	if(!Ti.App.Properties.hasProperty('RemindToRate')) {
		Ti.App.Properties.setString('RemindToRate', 0);
	}
	var remindCountAsInt = parseInt(Ti.App.Properties.getString('RemindToRate'), 10);
	var newRemindCount = remindCountAsInt + 1;

	if(remindCountAsInt === -1) {
		// the user has either rated the app already, or has opted to never be
		// reminded again.
		return false;
	} else if(newRemindCount < usecount) {
		Ti.App.Properties.setString('RemindToRate', newRemindCount);
	} else if(newRemindCount >= usecount) {
		var alertDialog = Titanium.UI.createAlertDialog({
			title : 'Please rate this app!',
			message : 'Would you take a moment to rate this app?',
			buttonNames : ['OK', 'Remind Me Later', 'Never'],
			cancel : 2
		});
		alertDialog.addEventListener('click', function(evt) {
			switch (evt.index) {
				case 0:
					// "Ok" - open the appropriate rating URL, and set flag to never
					// ask again
					Ti.App.Properties.setString('RemindToRate', -1);
					if(Ti.Android) {
						Ti.Platform.openURL(goog_url);
					} else {
						Ti.Platform.openURL(ios_url);
					}
					break;
				case 1:
					// "Remind Me Later"? Ok, we'll reset the current count to zero
					Ti.App.Properties.setString('RemindToRate', 0);
					break;
				case 2:
					// "Never" - Set the flag to -1, to never ask again
					Ti.App.Properties.setString('RemindToRate', -1);
					break;
			}
		});
		alertDialog.show();
	}
}

function iOSURLFromAppId(appId) {
	return 'itms-apps://itunes.apple.com/WebObjects/MZStore.woa/wa/viewContentsUserReviews?id=' + appId + '&onlyLatestVersion=true&pageNumber=0&sortOrdering=1&type=Purple+Software';
}

function googURLFromAppId(appId) {
	return 'market://details?id=' + appId;
}

exports.checkNow = RateMe;
exports.iOSURLFromAppId = iOSURLFromAppId;
exports.googURLFromAppId = googURLFromAppId;

Sample Implementation

var RateMe = require('RateMe');
var iOSURL = RateMe.iOSURLFromAppId('384080636');
var googURL = RateMe.googURLFromAppId('couk.mmtdigital.orion.ianrankin');

RateMe.checkNow(iOSURL, googURL, 1);