Sentinel Hub
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QWC2 has a built in compare function that allows you to compare layers.

Below is an example of how to use this with Sentinel Hub NDVI data

1.  Create Your QGIS Project
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Create Your QGIS Project using the Sentinel Hub QGIS Plugin

2.  Create two layers
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Create layers with differing dates you wish to compare:

.. image:: images/qwc_sentinel_hub_1.png

3. Publish your project as normal
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.. image:: images/qwc_sentinel_hub_2.png

4. Under Map Tools, go to Layers and Legends
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Tick the "Compare top layer" box

.. image:: images/qwc_sentinel_hub_4.png

You can now use the slider to compare the dates:

.. image:: images/qwc_sentinel.gif