Why you'll like it
The essentials, done properly — and a few touches you won't find elsewhere.
- A feed, not a filing cabinet — your newest mail as readable cards
- DMs: real conversations, separated from the newsletters automatically
- Private on-device AI — your mail never leaves your phone
- Suggested replies you review and edit; Nextbox never sends for you
- Nothing hidden: chronological All Mail is always one tap away
- Tracking images blocked by default; every link shows its real destination
Meet Nextbox
The Feed shows new mail as readable cards with fast, reversible actions. The DMs tab collects real back-and-forth threads — the ones where at least two people have actually written something — so active conversations stop getting buried under receipts, newsletters, and notifications.
On supported devices, Nextbox can privately suggest short replies, summarize long threads, and propose what likely needs you. That work happens on your device using the operating system's own language model. Your email is not sent to Nextbox or to any AI company for these features.
Nothing important disappears. Priority is a visible suggestion you can correct, never a hidden mailbox — the complete, newest-first list of your mail is always one tap away. And Nextbox never sends a word you did not write and press send on.
Frequently asked
Does my email go to your servers?
No. Nextbox connects from your device straight to your mail provider over an encrypted connection. Message content, attachments, contacts, and search queries never touch a Nextbox server — there is no mail server to touch. Licensing and support (Note to Joe) are the only things that talk to me, and they never see your mail.
How does the AI work if my mail stays on my device?
It uses the language model built into your phone's operating system. The model runs locally, has no network access, and has no ability to send, delete, archive, or read anything you haven't opened. It's available only on newer devices and in some languages — Nextbox tells you plainly when your device can't do it, and everything else in the app works normally either way.
Can the AI send an email on my behalf?
No, and it structurally cannot. Suggested replies drop into the normal composer as editable text. You review it and you press send. There is no auto-send, no auto-archive, and no autonomous agent.
If Nextbox decides something isn't a priority, does it disappear?
Never. Priority is a label on a card, not a mailbox. The Feed's complete, newest-first list of everything is always one tap away, and Nextbox can't hide mail from it even if the suggestion is wrong. When it is wrong, you correct it, and it learns — on your device only.
Which email providers work?
Gmail and Outlook sign in with OAuth. Fastmail, iCloud, and self-hosted accounts work over standard IMAP with an app password. Actions you take in Nextbox — archive, star, read — show up correctly in your provider's own app, and vice versa.
Is there a desktop version?
Yes — macOS, Windows, and Linux, sharing the same on-device architecture. Desktop doesn't have an OS-level private language model yet, so the AI features are phone-only for now. Nextbox says so rather than quietly sending your mail somewhere to make up the difference.
Pricing
Free
Ad-supported on mobile. Full web access.
Premium Monthly
No ads. Everything unlocked. All platforms.
Premium Yearly
Two months free.
Ready to try Nextbox?
Your inbox, organized around people — not folders