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- Seifert, Dan (May 29, 2015). "Spark for iPhone is a fast, smart way to manage your email".
- Biggs, John. "Spark Is An Email Client That Shows You What's Important, Lets You Delete What Isn't".
- Bryant, Martin (May 29, 2015). "Spark: a new iOS email app for power users, with clever ideas".
- Klosowski, Thorin. "Spark Arrives on iPad, Gets New Color Options on iPhone".
- Bell, Karissa. "Mailbox is shutting down, so here are 5 email apps to use instead".
- Klosowski, Thorin. "Mailbox Is Shutting Down, Try These Free Alternatives".