Metafields Guru
Browser extension | Metafield sets | Bulk editor,import/export
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Popular with businesses in the United States
App highlights
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Seamless workflow: use directly in Shopify admin
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Speed tested: no impact to your online store

Reviews
Roff Milling
Best Metafields app out there. I like the extension that allows you to edit directly on the product, and it would be great if you could do it on blogs and pages as well.
TP Toys
Great app for additional product functionality. Easy to use and quick to implement. Currently in use across four of our stores and would recommend others to use it.
AIDAN WHITE
This apps is very helpful. It save time. Its very easy to use. I recommended.
You can create your bundles very quick.
ReChic Ltd
Just started using it, seems straight forward and does what I need i.e. create and have visibility of metafields. Some aspects are still in development e.g. bulk editing.