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I know there's an account viewer for Stellar - its here: https://www.stellar.org/account-viewer/#!/
AFAIK, this works for Livenet, not for Testnet. Is there a similar tool for testnet?
I'm familiar with:
Stellar Desktop client
And the Stellar Laboratory, which is basically just a visual tool to interact with horizon
Yes you can find the Stellar's own account viewer for test and live in their site.
Here is the link for test:
TEST ACCOUNT VIEWER IN STELLAR
The same you can find for live if you switch at upper right corner to Public or you can access from the link:
LIVE ACCOUNT VIEWER IN STELLAR
Required, but never shown