Shortwave vs Mails.ai
When comparing Shortwave vs Mails.ai, which AI Email Assistant tool shines brighter? We look at pricing, alternatives, upvotes, features, reviews, and more.
In a comparison between Shortwave and Mails.ai, which one comes out on top?
When we put Shortwave and Mails.ai side by side, both being AI-powered email assistant tools, The community has spoken, Mails.ai leads with more upvotes. Mails.ai has 8 upvotes, and Shortwave has 6 upvotes.
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Shortwave
What is Shortwave?
Shortwave is an AI email client built by former Google engineers that wraps Gmail with inbox organization tools and an agent you can prompt to search, write, schedule, and filter mail. It runs on iOS, Android, Mac, and Windows and syncs with Gmail accounts. The app positions itself as a spiritual successor to Google Inbox, with bundles, splits, and keyboard shortcuts at the center of daily triage.
Most Gmail add-ons bolt on one feature. Shortwave treats the whole inbox as a workflow surface: you triage with bundles and todos first, then ask the agent to draft replies, run natural language search across years of mail, or spin up filters written in plain English. That combo of Inbox-style organization plus a prompt-driven assistant sets it apart from Superhuman-style speed clients and basic AI summarizers.
Sales reps, founders, and support leads use it to split high-priority threads, track read receipts, and share live threads with teammates without pasting screenshots into Slack. Teams on Gmail who miss Inbox bundles or want calendar-aware scheduling from inside mail tend to stick with it once they adopt the Shortwave Method triage flow.
Mails.ai
What is Mails.ai?
Mails.ai gives software agents a real email inbox through a REST API and npm SDK. Create an agent address, send transactional messages, receive replies, and hook replies into your code with structured events that include injection scores and sender reputation.
Generic email APIs leave cold outreach enforcement to an acceptable-use policy your agent can accidentally violate. Mails.ai refuses cold outreach inside the send call with a 422 response, so a bad prompt cannot burn your domain reputation. That API-level block is the clearest reason to pick it over a general SMTP relay when agents are doing the sending.
Developers building support bots, booking assistants, and workflow agents use it with TypeScript, Python, or the MCP server in Claude Code and Cursor. Pricing starts free with no card, then monthly Pro and Scale tiers while metered per-event billing rolls out.
Shortwave Upvotes
Mails.ai Upvotes
Shortwave Top Features
AI filters label, star, archive, or delete new mail based on prompts you write in plain English (up to 50 on Max plan)
Business plan runs roughly 150 to 300 Standard intelligence AI requests per day depending on request complexity
Natural language search spans up to 5 years of mail history on Business, unlimited on Premier and Max
Connects to Slack, Calendar, Notion, Asana, and HubSpot, plus 3,000+ apps through Tasklet integration
Bundles group promotions, newsletters, and updates so you can clear bulk mail in minutes
Shared live threads let teams comment, assign owners, and track done status inside the inbox
Mails.ai Top Features
Creates a working agent inbox with about six lines of SDK code
Returns 422 cold_email_prohibited instead of sending unsolicited outreach
Scores every inbound message for prompt injection before your agent reads it
Optional classification adds intent, entities, and urgency for $0.003 per inbound on metered pricing
Ships @mailsai/sdk and @mailsai/mcp-server on npm for TypeScript, Python, and MCP workflows
Monthly tiers today at Free $0, Pro $20, and Scale $99 while metered billing launches
Shortwave Category
- Email Assistant
Mails.ai Category
- Email Assistant
Shortwave Pricing Type
- Freemium
Mails.ai Pricing Type
- Freemium