GAIA vs HEY Email
HEY is a paid email service from 37signals (the makers of Basecamp) at hey.com. It screens first-time senders and sorts approved mail into the Imbox, The Feed and Paper Trail, using a @hey.com address or your own domain. GAIA is different: an AI assistant that works on top of your existing Gmail or Outlook inbox instead of replacing it.
HEY is an email service made by 37signals, the company behind Basecamp. It lives at hey.com, gives you a @hey.com address (or your own domain on HEY for Domains), and runs in its own apps for web, Mac, Windows, Linux, iPhone, iPad and Android. It is a paid service with a free trial and no free tier.
HEY's model starts with the Screener. The first time someone emails you, the message waits until you screen the sender in or out. Approved senders go to one of three places: the Imbox for mail from people and services you care about, The Feed for newsletters you read like a feed, and Paper Trail for receipts and notifications. Reply Later and Set Aside hold messages you need to come back to. HEY also blocks most tracking pixels. All of this runs on decisions you make once per sender, not on AI.
Where GAIA fits: GAIA is not a new mailbox. It is an AI assistant that connects to the Gmail or Outlook account you already have and does the work around email: it triages incoming mail by urgency, drafts replies for you to approve, turns requests into tasks, labels and archives, and links email to your calendar and other tools. You keep your address, your email client and your filters.
Choose HEY if you want a calmer mailbox and are happy to move your email to a new address and new apps. Choose GAIA if you want to stay on Gmail or Outlook and hand off the triage, replies and follow-ups. If you searched for an email API, MCP server or CLI: GAIA works through the official Gmail and Outlook APIs, can call any MCP server you add, and ships a CLI (gaia) for self-hosting.
Feature Comparison
| Feature | GAIA | HEY Email |
|---|---|---|
| Core approach | Proactive AI productivity OS that manages email, calendar, tasks, and your other connected tools autonomously on your behalf | Opinionated email service with a fixed three-section inbox model (Imbox, The Feed, Paper Trail) designed to change how you manually process email |
| Email management | Gmail and Outlook automation: reads and triages by urgency, drafts context-aware replies, applies labels, creates tasks from emails, and drives inbox-zero workflows proactively | The Screener holds first-time senders until you approve them; you decide whether each approved sender lands in the Imbox, The Feed or Paper Trail. Sorting follows your decisions, not AI triage |
| AI features | Ambient AI that acts without prompting: watches your inbox, detects urgency, summarizes threads, writes drafts, routes messages to tasks, and executes cross-tool workflows | Built around decisions you make yourself (screening, Reply Later, Set Aside) rather than AI that triages or acts on your mail |
| Task creation from email | Automatically extracts action items from emails and converts them into structured tasks with priorities, deadlines, and project assignments: no manual intervention required | Reply Later and Set Aside hold emails you need to come back to; moving a request into a task tool is up to you |
| Gmail support | Connects to your existing Gmail or Outlook account through the official API, with read and write access to your real inbox | HEY is its own mailbox: a @hey.com address, or your own domain on HEY for Domains. You can forward Gmail into HEY, but you read and reply in HEY's apps |
| Workflow automation | Multi-step automations described in natural language with email-triggered actions spanning inbox, calendar, Slack, Notion, GitHub, Linear, and other tools | A self-contained email app, not a workflow automation tool; connecting email to other apps is outside its design |
| Calendar integration | Creates and edits Google Calendar events, finds free slots, schedules meetings, generates meeting briefings, and links calendar context back to email and tasks | Includes its own calendar, HEY Calendar, inside the HEY apps; it is not an assistant for Google Calendar |
| Memory and context | Graph-based persistent memory that links emails to the tasks they created, the people involved, the meetings where they were discussed, and the projects they belong to | Per-sender history in the mailbox; no AI memory linking emails to tasks, projects or other tools |
| Integrations | Integrations including Gmail, Outlook, Google Calendar, Slack, Notion, GitHub, Linear, Todoist, Asana, ClickUp, and Jira, plus any MCP server you add | Self-contained by design: HEY is meant to be used in its own apps rather than as a hub wired into other tools |
| Platforms | Web app, desktop app, and bots for Discord, Slack, Telegram, and WhatsApp; a CLI for self-hosting | Web, plus apps for Mac, Windows, Linux, iPhone, iPad, and Android |
| Source-available | Source-available (PolyForm Noncommercial) and self-hostable via Docker: when self-hosted, your email data stays on your server apart from calls to the model provider you configure | Proprietary closed-source SaaS service; no self-hosting option; all data processed through 37signals infrastructure |
| Pricing | Hosted: paid plan at $30/month; self-hosting free for non-commercial use (plus your own model API costs) | Paid subscription with a free trial and no free tier; HEY for Domains is billed per user |
Why Choose GAIA
- +Works with your existing Gmail account: no email migration, no new address, no disruption to your current workflow or contacts
- +Proactively manages email without user input: triages urgency, drafts replies, creates tasks, and labels messages before you open your inbox
- +Connects email to your entire tool stack via deep integrations, enabling cross-tool automations that HEY's closed ecosystem cannot support
- +Graph-based memory links emails, tasks, meetings, and people so every AI action is informed by the full context of your work
- +Source-available and self-hostable: full data sovereignty, free for non-commercial use (plus your own model API costs), with a hosted Pro plan at a comparable price to HEY's annual plan
Where HEY Email Excels
- +Opinionated Imbox, Feed, and Paper Trail model gives email a clear structure that many users find genuinely reduces cognitive load without any configuration
- +The Screener workflow eliminates cold email and spam from new senders before they ever reach your inbox: a simple, effective gatekeeping mechanism
- +Cross-platform native apps for Mac, Windows, Linux, iOS, and Android with a polished, distraction-free design purpose-built around HEY's philosophy
The Verdict
HEY Email is a thoughtfully opinionated product that solves email overload by imposing structure: the Screener, the Imbox, The Feed and Paper Trail give every message a designated place. For people willing to move to a new address and HEY's own apps, and who would rather make sorting decisions themselves than delegate them to AI, it delivers genuine clarity. GAIA is built for people who do not want to change their email address or client but do want AI to carry the load: triaging Gmail or Outlook, drafting replies, extracting tasks, and automating workflows across their tools. HEY reorganizes the way you see email; GAIA handles email so you spend less time on it.
Frequently Asked Questions
Looking for the best HEY Email alternative? See our complete guide → Best HEY Email Alternative in 2026
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