This is the GEE version of SIAC, under the intention of utilizing the power of GEE servers and wide variety of data. It has a simple UI based on the GEE UI APIs, which has the ability to search available Sentinel 2 images based on point clicked on the map, defined date range and cloud coverage, and correct for selected one image tile or do AC for all of them.

1. Click here to open the GEE APP;

2. Click show code to show the code for the UI, and click Run to start the UI;

3. Click over the map top set AOI, using datesliders to set time period and using slider to set cloud cover threshold

4. Click search to get the desired Sentinel 2 images, then choose to Do AC for one selected image or for all the results;

5. Cick Do LAI to get LAI products for all the results

It is hard to click RUN button for every single image, so a piece of code to do it. To use it, you need to press F12 in your keyboard to open browser console and paste the following code:

Great thanks to Dongdong Kong for sharing it on stackexchange!

/**
 * Copyright (c) 2017 Dongdong Kong. All rights reserved.
 * This work is licensed under the terms of the MIT license.  
 * For a copy, see <https://opensource.org/licenses/MIT>.
 *
 * Batch execute GEE Export task
 *
 * First of all, You need to generate export tasks. And run button was shown.
 *   
 * Then press F12 get into console, then paste those scripts in it, and press 
 * enter. All the task will be start automatically. 
 * (Firefox and Chrome are supported. Other Browsers I didn't test.)
 * 
 * @Author: 
 *  Dongdong Kong , 28 Aug' 2017 
 *      Sun Yat-sen University
 */

function runTaskList(){
    var tasklist = document.getElementsByClassName('task local type-EXPORT_IMAGE awaiting-user-config');
    for (var i = 0; i < tasklist.length; i++)
            tasklist[i].children[2].click();
}
// confirmAll();
function confirmAll() {
    var ok = document.getElementsByClassName('goog-buttonset-default goog-buttonset-action');
    for (var i = 0; i < ok.length; i++)
        ok[i].click();
}
runTaskList();
confirmAll();

Yin, F., Lewis, P. E., Gomez-Dans, J., & Wu, Q. (2019, February 21). A sensor-invariant atmospheric correction method: application to Sentinel-2/MSI and Landsat 8/OLI. https://doi.org/10.31223/osf.io/ps957

An example UI:

GNU GENERAL PUBLIC LICENSE V3