Email and newsletters decision
Airmail
A competent developer can build a narrow, single‑platform email client implementing the core loop (IMAP/SMTP sync, unified inbox, compose, templates, snooze) in a few months of part/full-time work, but reproducing the full multi‑platform, polished product with many integrations and platform-specific UX is not realistic for one person.
Visit website↗Open-source builds that already do this
Every project below is open source and already does this job today. Fork one, self-host it, or take the parts you need — the build prompt further down assumes an empty file, and this is the shortcut past that. Licences differ; check the one on each card before you ship.
What a replacement has to do
- A minimal replacement must let a user add IMAP/SMTP (and optionally Exchange/Office365) accounts, fetch and store messages locally, view and search a unified inbox, compose/send messages (with templates and send-later), and run simple local rules/filters and snooze.
What it still won’t have
- Cross-platform polished native UIs for iPhone, iPad, Mac and Vision Pro
- Deep integrations and many third-party app integrations
- Apple Design Award polish and long-term product polish/QA
- Enterprise MDM and business packaging features
What remains hard
- Product polish and ongoing maintenance
First-year cost
Keep paying
Paying is—cheaper in year one.
On cash alone, building overtakes the subscription at 3 seats.
Money you would actually spend
Time you would spend
—
What you would spend
What we assumed
The verdict above measures whether you could build it. This one is only about money.
Runnable build prompt
Build a single‑platform macOS native email client (Swift + SwiftUI) that supports IMAP and SMTP with OAuth for Gmail/Office365, stores messages and attachments in SQLite, displays a unified inbox with quick filters and search, supports composing with reusable templates and a send‑later queue, and implements local rules and a snooze feature. Out of scope: iOS/iPadOS/Vision Pro ports, enterprise MDM packaging, and third‑party plugin system. Include background sync, error handling for network/auth failures, unit tests for core sync and rule logic, and integration tests for sending/receiving flows.
How we checked
How the score was reached
- Partly verdict base52
- An open-source build was found+5
- 3 cited sources+3
- 3/3 assessment runs agreed+4
- Evidence score64
The base comes from the verdict. Everything under it is a check that either happened or did not, and each one is a fact frozen in this record rather than a judgement made at render time — so the same evidence always produces the same number.
How scoring works →Cited sources · 3
Every page the run actually retrieved.
- official productAirmail - Email Client for iPhone, iPad and Mac
- open sourceFoundry376/Mailspring
- open sourcemailpile/Mailpile
Integrity checks
What held up, and what did not.
