We have that here:

https://www.pricecharting.com/game/sega-dreamcast/vigilante-8-2nd-offense

The name was slightly wrong, which I've fixed now.

This has been fixed now.  Sorry for any problems.

Are you referring to the eBay Lot Bot?

https://www.pricecharting.com/ebay-lot-bot

Duplicate.  Closing in favor of this.

https://pricecharting.userecho.com/communities/1/topics/748-add-list-of-biggest-price-changes

Duplicate.  Closing in favor of this.

https://pricecharting.userecho.com/communities/1/topics/748-add-list-of-biggest-price-changes

Closing because it is a duplicate.

https://pricecharting.userecho.com/communities/1/topics/398-amiibo-cards

Please vote for this existing request

Closing as a duplicate.  Another request was already made for that here:

https://pricecharting.userecho.com/communities/1/topics/710-add-graded-condition-to-collections

Please up vote that request.

This is live on the site:

https://www.pricecharting.com/search-products?console-uid=G105

You can share collections now.  On your collection page (the one showing your collection value), there is a share link at the top of the page.  You can use that to share with anybody on any site.  

For example, here is an admin test collection:

https://www.pricecharting.com/offers?seller=7cgdyu5ynzos3mxwhfh46xj3f4&status=collection

Is that what you were envisioning?

We do not have a native app from an app store, but we do have a web app.  

To install the webs app on your phone, follow the directions here.  The app looks and runs like a regular app.

http://www.howtogeek.com/196087/how-to-add-websites-to-the-home-screen-on-any-smartphone-or-tablet/