If you can figure out how to utilize AI, surely you can figure out how to implement bilateral inbox sorting
Estimated from the grossing charts of Oct 23, 2026 in the 53 countries we track, and ratings growth on the App Store.
From our daily snapshots of every grossing chart.
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Measured from the store, not estimated.
From the latest 500 reviews on the United States App Store, Jul 19, 2023 to Oct 16, 2026: 16% are 1 or 2 stars. Open a theme to read what people wrote.
17 of the 1 and 2 star reviews.
★★★★★ About 6-9 months (or longer) ago a very serious bug showed up and I reported it.
★★★★★ I thought this was my answer to my failing apple Mail app. After 3 months of use Spark is now acting as though its a fresh install and has deleated all saved mail!
★★★★★ It has lacked some integration feature for a while - like it doesn't integrate with the iOS calendar to add events to the calendar like the regular mail app does and now the Print / Save as PDF function is not working.
13 of the 1 and 2 star reviews.
★★★★★ Since Readdle will not update Spark Classic to use the new Microsoft AuthN method, this has forced me to finally migrate to Apple's native Mail client.
★★★★★ It crushes the operating speed of the computer, is impossible to uninstall, constantly logs you out, and requests that you update the software before using it at least twice a week.
★★★★★ I've loved using spark for years no, but I recently updated Spark and have been having so many issues!
12 of the 1 and 2 star reviews.
★★★★★ If you have an a Microsoft account, you get a non-dismissible notification that freezes your whole window forcing you to either remove your Microsoft or download their other forced-AI-in-everything app that's geared…
★★★★★ Use land line phones or email for your tw0-stage verification.
★★★★★ Out of nowhere it logged me out and when I try to log in it will show me like it is logging in but it just keep loading for hours.
12 of the 1 and 2 star reviews.
★★★★★ Weeks have gone by and still no fix!
★★★★★ But over the past 2 weeks, it has randomly deleted sent emails.
★★★★★ Today I opened my Spark email app and all my emails are gone.
10 of the 1 and 2 star reviews.
★★★★★ If you have an a Microsoft account, you get a non-dismissible notification that freezes your whole window forcing you to either remove your Microsoft or download their other forced-AI-in-everything app that's geared…
★★★★★ The app frequently crashes when searching for things.
★★★★★ It would go all the way through the login and authentication process and then the popup browser window would just close or crash.
9 of the 1 and 2 star reviews.
★★★★★ So after months of the issue being unresolved, I tried contacting them again and YET AGAIN was told by someone on their Support Team that they are aware of the bug, but there is no ETA for it to be repaired.
★★★★★ I've tried to be in contact with support services but they are extremley slow and unresponsive.
★★★★★ I submitted a support ticket, and they asked me if I made the error.
6 of the 1 and 2 star reviews.
★★★★★ I had to re-read every word, looking for what was removed, and re-entering the missing words.
★★★★★ It has lacked some integration feature for a while - like it doesn't integrate with the iOS calendar to add events to the calendar like the regular mail app does and now the Print / Save as PDF function is not…
★★★★★ Imagine that…an Emall Client that lacks the ability to Attach or Download Attachments.
5 of the 1 and 2 star reviews.
★★★★★ All the normal, basic features you get with literally every other email service is locked behind a paywall.
★★★★★ The UI is inoffensive and minimal (as it's supposed to be), there is never a single ad or a subscription prompt, and it works perfectly.
★★★★★ I wrote to the Developers of course (over 5 months ago) and got the response that they are aware of the bug which, strangely enough, doesn't occcur in their new AI-Powered SUBSCRIPTION version.
83 of the 4 and 5 star reviews.
★★★★★ The UI is clean and intuitive, there are useful customization options, the main things you want to do in an email app are right at your fingertips, and the things you only do occasionally are easy to find.
★★★★★ Finally, a fast, easy to use, no-nonsense mail app.
★★★★★ I've been using Stripe on my Mac Airlock Laptop, as well as my iPad, and my phone, and across all 3 devices it is so easy to use.
56 of the 4 and 5 star reviews.
★★★★★ The UI is clean and intuitive, there are useful customization options, the main things you want to do in an email app are right at your fingertips, and the things you only do occasionally are easy to find.
★★★★★ Nice aesthetic, much prettier and easier to organize than the plain old gmail interface.
★★★★★ I stuck through with them because the interface and functionality was great.
36 of the 4 and 5 star reviews.
★★★★★ The UI is clean and intuitive, there are useful customization options, the main things you want to do in an email app are right at your fingertips, and the things you only do occasionally are easy to find.
★★★★★ I get my emails as they come in and it helps to keep my business emails separated from my personal emails.
★★★★★ I have been using Spark for several years now and find it so useful.
30 of the 4 and 5 star reviews.
★★★★★ I'm not asking for the app to be free, and I understand that subscriptions are useful for continuous development, but the reality is that I'm just not willing to pay monthly for an email client.
★★★★★ Great app that's worked well for these past 5 years. If I had any complaints, maybe it's that the emails sometimes disappear from the feed view and you have to search specifically for things. Or also that it sometimes…
★★★★★ For a free app, it's hard to beat.
28 of the 4 and 5 star reviews.
★★★★★ Changing my review back to 5 stars now that Readdle has updated Spark to support the new Microsoft account!
★★★★★ As of October 2026, Microsoft is changing how their accounts work (according to Spark customer service) which should allow us to use the better “classic” app again.
★★★★★ My hat is off to the great development and support teams at Readdle.
Found by matching words and phrases in the reviews, not read by a person. A review can count toward more than one theme.
Latest reviews, United States App Store.
If you can figure out how to utilize AI, surely you can figure out how to implement bilateral inbox sorting
Now generates ‘firewall’ issues which it never used to have and no other apps on my computer generate. Just doesn’t work anymore at all.
Almost every day the logged in accounts get logged out.
*Update 9/29/2026* Changing my review back to 5 stars now that Readdle has updated Spark to support the new Microsoft account! Getting it updated took way longer than it should have, but at least Readdle listened to their users and changed course instead of forcing users on to the new (and far inferior) Spark Desktop app. So thank you!
The “classic” app was the best mail app out there, but stopped working with Microsoft accounts, so I was forced to “upgrade” to the newer Desktop-AI version. The newer one is terrible - unintuitive, overblown, clunky and hard to use. As of October 2026, Microsoft is changing how their accounts work (according to Spark customer service) which should allow us to use the better “classic” app again. So thankful!
They stoped supporting outlook to force users on to the new horrible version.
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Released Nov 30, 2016. Current version shipped Oct 3, 2026.
Prices, ranks and reviews are per country. Revenue above is already worldwide.