# How(why) do I purchase a module?

**URL:** <https://forum.inductiveautomation.com/t/how-why-do-i-purchase-a-module/72103>\
**Category:** Ignition\
**Tags:** perspective, vision, ignition81\
**Created:** [April 5, 2023, 4:26pm UTC](https://forum.inductiveautomation.com/t/how-why-do-i-purchase-a-module/72103 "2023-04-05T16:26:46Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![KIM\_SUNG\_HOO](https://avatars.discourse-cdn.com/v4/letter/k/977dab/32.png) [@KIM\_SUNG\_HOO](https://forum.inductiveautomation.com/u/KIM_SUNG_HOO)\
**Post date:** [April 5, 2023, 4:26pm UTC](https://forum.inductiveautomation.com/t/how-why-do-i-purchase-a-module/72103/1 "2023-04-05T16:26:46Z")

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Hi communitiy,

I have a lot of questions about licensing.

first, I am curious about the licensing policy. I'm not sure exactly which module licenses are required on the system I'm trying to configure.

second, If I buy a module, does this have to be purchased per gateway? Or is it something that belongs to the designer's account?

third, Can I manage realtime data when I purchase only the vision module? What can you do with the tag historian module?

thanks for reading!

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**Author:** ![lrose](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/lrose/32/62724_2.png) [@lrose](https://forum.inductiveautomation.com/u/lrose)\
**Post date:** [April 5, 2023, 4:52pm UTC](https://forum.inductiveautomation.com/t/how-why-do-i-purchase-a-module/72103/2 "2023-04-05T16:52:01Z")

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Welcome to the forum!

> [@KIM\_SUNG\_HOO](#):
>
> first, I am curious about the licensing policy. I'm not sure exactly which module licenses are required on the system I'm trying to configure.

That depends entirely on your system, and how you intend to use Ignition. Your sales representative will be able to help you determine what modules you need (if any outside of the core).

> [@KIM\_SUNG\_HOO](#):
>
> second, If I buy a module, does this have to be purchased per gateway? Or is it something that belongs to the designer's account?

Modules must be purchased per gateway. Again, your sales representative will be able to help you with this. There will be different pricing options depending on your application needs.

> [@KIM\_SUNG\_HOO](#):
>
> Can I manage realtime data when I purchase only the vision module?

Short answer is yes.

The slightly longer answer depends on what exactly you mean by manage.

> [@KIM\_SUNG\_HOO](#):
>
> What can you do with the tag historian module?

The tag historian module allows you to easily store historical data to a database. It grants the ability to use some components, such as the Easy Chart in Vision and the Power Chart in perspective. Again, your need for this module is largely dependent on your application and your Sales representative will be able to help you with that.

P.S. This specific topic is for Module Development using the SDK. Your question should have probably been posted in the Ignition Topic to really get the most amount of help. Perhaps a moderator will come by and move it.

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**Author:** ![JordanCClark](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/jordancclark/32/83362_2.png) [@JordanCClark](https://forum.inductiveautomation.com/u/JordanCClark)\
**Post date:** [April 5, 2023, 8:22pm UTC](https://forum.inductiveautomation.com/t/how-why-do-i-purchase-a-module/72103/3 "2023-04-05T20:22:58Z")

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You can also trial them at 2-hour lengths to help you see which ones are the best fit for your application. Install/uninstall the modules as you wish.