His concerns are valid, but we are both wanting to finish our discussion (it is/was quite open).
However, the canonical answer to "why do we need another X in this space" is "why did google need to be another search engine?" It may be that we are fulfilling different demands, and we both agree that competition is better for everyone involved.
Existing is a fairly useful feature.
1) I went to notify.io and looked for a list of supported platforms, and saw prominent notices that your problem is described as "Get desktop notifications from web applications" and that the quickstart suggestions presume use of a Mac client.
2) I looked at every top-level navigation element for a list of supported platforms, and failed to find it.
3) I dug around a bit for the development blog via Google, and found a roadmap post from January, which included: "Outlets repesent the other major feature of Notify.io. They’re ways you can get a notification. ... Currently supported Outlets besides Desktop Notifier are Email, Jabber IM, and Webhooks. Outlets to look forward to are SMS, Twitter, IRC, and perhaps telephone."
Now, as one OSS developer to another, let me say this as gently as I possibly can: if you want people to think of you when someone says "mobile notifications", you should probably note somewhere fairly conspicuous that you actually support mobile notifications.
It's such a promising concept, but this way I don't think a lot of users will catch up on it.
Btw, telephone means actually calling you via telephony, not mobile. However, an iPhone client is planned.
Obviously marketing something like this is hard. Notifo starts with a niche so it's easy. We did too: desktop notifications. But hey hey, we also do a lot more.
Anyway, we are a lot more badass, address some problems Notifo doesn't, but we just don't have a mobile client yet. Womp womp. We'll see who can be the better platform though...
You're handling this extremely well, btw. I've had my work ripped off before, and it is beyond upsetting.