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If you only need it on occasion or for emergencies, there's a lot of cheaper options. If you're using it on a daily basis for development work, $20 is a steal! I'd gladly pay $100 for Blink! It's one of the most polished and functional apps on my iPad.

It's free and opensource on github (if you register as developer for apple).

Edit: spelling error

Registering in the Apple Development program costs $99 (per year) too

That is no longer true.

Registering for an account is free. you can get a signing key for testing (i.e. to build and run on your own device) for free also. You only need to pay if you want to publish to the App Store.

I actually use iphone with blink as my full time working device.