Built by an owner of several businesses who tried every email client on the market and still could not get through the mail, follow the tasks in it, or tell what mattered from what did not.
Every mail ends deleted, archived, or a to-do with a real deadline. Then Gadfly does what no other mail app does: it keeps after you. Pressure rises as the date nears, nudges arrive on time, and your hottest to-dos live on your lock screen until they are finished.
Early sign-ups get 3 months of Pro free, not 1. · Mac, Windows, Linux, iPhone and Android · Gmail, Outlook, iCloud, any IMAP
Snooze, "remind me" and follow-up nudges bring a mail back one time, and then it is on you again. We looked at every mail client with tasks and reminders. None of them do these.
Pressure that rises until it is done Only in Gadfly Every to-do sits in a band set by its deadline: calm, hot a week out, burning two days out, critical once overdue. As the date nears it climbs, and critical ones break through your quiet hours. Other apps remind you once; Gadfly keeps the pressure on.
Lock screen and home screen widgets Only in Gadfly Your hottest to-dos on the iPhone lock screen and home screen, critical first, plus unread count. Private on a locked phone: band and short title only.
Deadlines that follow the conversation Only in Gadfly When a new message arrives, the deadline is read again from the whole thread. "We will get back to you next week" moves it; a contract expiry stays put. A date you set is never touched.
Every to-do has a deadline Only in Gadfly The date the mail states, else an estimate from what is asked and who is waiting, else a default by importance. No to-do can silently rot without a date.
Deadlines with evidence Only in Gadfly A deadline taken from the mail shows the sentence it came from. No mystery dates.
Unread mail comes one at a time: delete, archive or to-do. A suggestion is ready on each one; accept it with Enter.
Claude reads the thread for the date that matters, quotes where it found it, and keeps it current as replies arrive. Your own date always wins.
Calm, hot, burning, critical. The Chase list, pushes, widgets and the lock screen keep the pressure on until it is done.
Not a one-off reminder. Pressure that rises as the deadline gets closer.
Pressure that rises until it is done 
The Chase list 
Nudges on time, never spam 
Every to-do is a task tied to its email thread, with a deadline that keeps up with the conversation.
Turn any email into a to-do in one tap Deadlines that follow the conversation Every to-do has a deadline 
Each mail ends in one of three places: deleted, archived, or a to-do.
One mail at a time 
Triage suggestions that learn 
Spam rules and learned templates 
Gmail, Microsoft 365, iCloud, Fastmail and any IMAP account, all in one place.
Any email account 
New mail in seconds 
Reply, reply all, forward, drafts 
The email apps people try when they want mail and to-dos in one place.
| Feature | Gadfly | Filo Mail | Spark | Superhuman | Shortwave | HEY | Apple Mail | Gmail + Google Tasks | Outlook + Microsoft To Do |
|---|---|---|---|---|---|---|---|---|---|
| Turn an email into a to-do | ✓ Yes | ✓ Yes | ◐ Partly | — No | ✓ Yes | ◐ Partly | — No | ✓ Yes | ✓ Yes |
| Every to-do gets a deadline automatically | ✓ Yes | ◐ Partly | — No | — No | — No | — No | — No | ◐ Partly | — No |
| Deadline re-read when the thread changes | ✓ Yes | ? Not documented | — No | — No | — No | — No | — No | — No | — No |
| Pressure rises as the deadline nears | ✓ Yes | ◐ Partly | — No | — No | — No | — No | — No | — No | — No |
| To-dos on the iPhone lock screen | ✓ Yes | ? Not documented | — No | — No | — No | — No | — No | — No | — No |
| Any IMAP account (iCloud, Fastmail, your domain) | ✓ Yes | ◐ Partly | ✓ Yes | — No | — No | — No | ✓ Yes | — No | ✓ Yes |
| Price | €9/mo | Free; Plus $9.90/mo | Free; Plus €10/mo | From $30/mo | From $30/mo | $99/yr | Free | Free | Free / Microsoft 365 |
✓ yes · ◐ partly · ◔ coming · ? not documented · — no. From each product's own docs and pricing pages, checked November 2026. Spotted a mistake? Tell us and we fix it.
Yes, that is exactly what Gadfly is. Mark any email as a to-do and it gets a deadline read from the mail itself. Then Gadfly keeps the pressure on: the to-do moves from calm to hot to burning to critical as the date nears, you get a push before it is due, and the hottest ones sit on your iPhone lock screen until you finish them.
Gadfly launches on Mac, Windows, Linux, iPhone and Android on the same day. Leave your email on this site and you get one mail when it is out. Early sign-ups get 3 months of Pro free instead of the usual 30 days.
Snooze and remind-me bring a mail back once, then it is on you again. A Gadfly to-do never goes quiet until it is done, dropped on purpose, or snoozed by you: it has a date, it climbs through four pressure bands, and it stays on your Chase list, widgets and lock screen.
Gadfly is built by an owner of several businesses who tried every email client on the market and still could not get through the mail, follow the tasks in it, or tell what mattered from what did not. None of them kept after a task once the mail was read, so Gadfly was built to do exactly that, and it is the mail app its maker runs those businesses on.
Gmail and Google Workspace, Microsoft 365 and Outlook.com, iCloud, Fastmail, Yahoo, and any other IMAP account, including mail on your own domain. Add as many as you like; they share one inbox and one to-do list.
It reads the conversation. A date the mail states ("by Friday", an expiry, a renewal) wins, and Gadfly shows the sentence it came from. Otherwise it estimates from what is asked and who is waiting, and falls back to a default by importance. When a new message arrives, the deadline is read again. A date you set yourself is never changed.
Early sign-ups get 3 months of Pro free, not 1.
