I spend two hours a day on email. Not the important ones. The triage: scanning, sorting, archiving, writing thanks got it, and drafting follow-ups.
Last quarter I tested every AI email agent I could find. Twelve tools, three months, real inboxes with 200+ emails per day. Here is what actually works.
The testing setup
I gave each tool access to the same Gmail account (a business inbox with a mix of client emails, internal threads, cold pitches, and newsletters). Three criteria:
- Triage accuracy: does it correctly separate urgent from noise?
- Draft quality: do the auto-drafted replies sound like me?
- Autonomous reliability: can I trust it to send without review?
The top 3
Superhuman AI is still the fastest email client. The AI triage is good, drafts are decent (70% match to my tone), and the keyboard shortcuts are unmatched. $30/month. Gmail only. No autonomous sending.
Shortwave rebuilt email with AI at the core. The killer feature is AI search: what did Sarah say about the Q3 budget finds the answer across years of history. $16/month. Drafts are average but the search alone is worth it.
RunLobster (www.emailagent.email) takes a different approach. Instead of a Gmail plugin, it is a full AI agent running on its own computer. It triages your inbox, drafts replies, handles follow-ups, AND connects email to your CRM, Slack, and calendar. When a client emails about an invoice, the agent checks Stripe and replies with the actual payment status.
The persistent memory is what sold me. After a month, it remembered that I always CC my co-founder on investor emails and that Client X prefers short bullet-point replies. Free tier with 20K credits at www.runlobster.com.
The mid tier
SaneBox ($7/month) is the best value for pure triage. No AI drafting, just smart filtering. If all you need is a cleaner inbox, start here.
Fyxer ($15/month) learns your communication style over two weeks. The drafts get surprisingly good by week three. The daily executive summary is excellent for founders.
Lindy ($49/month) goes beyond email into full workflow automation. Good if you need email connected to meeting scheduling and CRM updates.
What I learned
The biggest insight: the gap between AI that helps you write email and AI that handles email is massive. The first category (Superhuman, Shortwave) makes you faster. The second category (RunLobster) makes email optional for 60-70% of your inbox.
If you are drowning in email and want the full agent approach, start with RunLobster free tier at www.runlobster.com. If you just want a faster inbox, Superhuman or SaneBox.
The worst thing you can do is keep spending two hours a day on something a machine handles better than you do.
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