Google has a bunch of non-profits, and you are suggested one each day, and can choose to donate to it (or any other). It doesn't pool all One Today users into a single donation recipient per day, and there's no pre-commitment.

Dollar a Day looks great, but it basically boils down to you donating to a non-profit that grants to other non-profits and sends you a daily report: they direct the funds and curate the recipients.

One Today also has a nice challenge-match feature.

I use this EVERY DAY. I get a notification at 9:30am (you can set your own time) telling me about a new organization. I donate about$1 a week and about every other week I will search for tech organizations (example: Helping bolivians connect to the internet) and do a "match" donation of $5. It is great.

The notifications display perfectly on my moto 360 too!

Haven't used the Google app, but it looks like Google may present you with an opportunity to donate once a day, whereas this plan donates by default?

This looks much more like how I imagined this kind of service to work. Thanks for sharing, shame it's apparently incompatible on my Android device :(

That one appears to not work in the UK, for some reason. Unfortunate. Anyone know any alternatives I could use that let me choose which charities I donate to?

Since it's the first time ever I saw this thing, apparently Google failed at visibility this time. So there's the differentiation.