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Steepshot only needs your posting key so it's pretty safe. You can even scan the QR code straight from your permission tab on steemit.com.

Thanks for the reply @exyle, I just realised they only needed posting key so I decided to risk it 😊 - I'm now half way through posting my first pic!

It's really cool to see how these apps have developed over the last few months. Thanks for keeping us updated!

I feel you , that is why they request posting private key.