According to the developer, there will be two versions:
- Paid: Sparrow will cost $24.99 but early birds will benefit from the $19.99 introductory price.
- Free: Sparrow Lite will be ad-supported. Carbon Ads is providing the nice ads you have certainly seen in the latest Beta version. The free version will allow one-account creation only.
Sparrow supports threads that include sent messages (like Gmail) and includes labels, notifications and more.
I’ve used Sparrow on and off during the beta period and have been impressed. It feels like a more modern app than Mail does, taking cues from Twitter for Mac and others. I’m excited to see it coming to the App Store.