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It's very neat, I like the simplicity of the API. If you promise to keep it up for a while, I'll definitely use it!

I use it myself, so it'll be up for the foreseeable future. Enjoy.

What's the technology stack? Would there be a way to persuade you to opensource it?

^^ Seconded.

I am fairly shocked it took this long for someone to make a DynDNS replacement. I haven't been able to effectively use DynDNS since last century.