# SMD PRO vs SMD Tool

SMD PRO is faster and provides more, advanced features. The table below compares major feature differences between SMD PRO and SMD Tool.

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#### <img src="https://2612735889-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F78uapr4J4VNbvdJ28oIo%2Fuploads%2FNmcACHV64MAqANBbdhhs%2Flogo_white%20bg.png?alt=media&#x26;token=f71b72f3-c9c4-466c-a454-b184003689ec" alt="" data-size="line">  [**SMD PRO** ](https://simplemetalens.gitbook.io/docs/smd-pro)

* Up to 20x faster metalens building than Tool <sup>1</sup>
* Up to 3.6x faster simulation than Tool <sup>2</sup>
* Higher memory efficiency
* Simulatable lens size: unlimited (memory-dependent)
* Imaging simulation along tangential & sagittal axes
* Supports 11+ unit cell shapes (including all in Tool & polygon)
* Unit cell library across visible and near-IR wavelengths
* Advanced GDS modification
* Modern UI
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#### <img src="https://2612735889-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F78uapr4J4VNbvdJ28oIo%2Fuploads%2FPlknMxm6X91ZkGlZYGK9%2Flogo_smdtool.png?alt=media&#x26;token=123278e6-1be0-4887-bdbf-8f027f939ce2" alt="" data-size="line">  [**SMD Tool**](https://simplemetalens.gitbook.io/docs/smd-tool)

* [13000x faster than FDTD](#user-content-fn-1)[^1]
* Simulatable lens size: < 1 million unit cells
* Imaging simulation along tangential axis only  &#x20;
* Supports 3 unit cell shapes (circle, square, rectangle)
* No unit cell library
* No GDS modification
* Basic UI
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1: Time measured for a metalens with 1 million unit cells.&#x20;

2: Focusing simulation was tested. Simulation ranges were adjusted to be identical between PRO and Tool.

1, 2: All tests were performed on Intel Core i7 1.7 GHz CPU and 15.7 GB memory.

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[^1]: **Lens for Simulation Test**

    * A free standing metalens focusing in air.
    * Numerical aperture 0.707
    * 100 unit cells.

    **FDTD Simulation Settings**

    * Accuracy: mid
    * Mesh size: ⅕ of a wavelength

    **SMD Tool Simulation Settings**

    * Wave samples per unitcell: 4 (corresponds to medium accuracy)
    * m: 5 (corresponds to ⅕ of a wavelength)

    Test was performed to simulate the intensity on the focal plane. Simulated areas on the focal plane were the same in both simulations. All tests were conducted on Intel Core i7 1.7 GHz CPU and 15.7 GB memory.
