https://techcrunch.com/2019/04/02/email-client-spark-lands-on-android/

Spark has managed to attract one million users on iOS and macOS over the years. But every time I’ve written about Spark, I’ve received many comments asking when the app would be available on Android. The answer is today.

Spark is an email client developed by Readdle, the company behind many popular productivity apps, such as PDF Expert, Scanner Pro, Calendars 5 and Documents. With email, the company is tackling a much bigger industry dominated by giants, such as Gmail and Microsoft Outlook.