Serif

What is Serif?

Serif is an AI executive assistant for your work inbox, built by Serif Inc. and positioned as "the AI coworker for your work inbox." Unlike a standalone email client, Serif connects to your existing Gmail account (with Outlook support) and works alongside it — there's nothing new to learn and your mail stays where it is. Its core job is to read incoming email, decide what matters, and pre-draft replies that sound like you, so you spend your time reviewing and sending rather than writing from scratch.

The product is aimed squarely at people who live in email and can't afford to fall behind: founders, solo operators, sales professionals, and small customer-facing teams. Serif learns your communication style from your sent mail — including how your tone shifts with different people — so a reply to a key client reads differently from a quick note to a teammate. It sorts messages into actionable labels, filters away spam and marketing noise, and surfaces the threads that need you first.

Beyond drafting, Serif behaves more like a real assistant than a writing tool. It tracks follow-ups and keeps chasing threads until they're resolved, summarizes meetings and turns next steps into tasks (with the follow-up email already drafted), and runs intake playbooks that collect documents and complete repeatable processes. Through integrations it can take actions in connected systems such as Stripe and Google Drive, look up information to ground its replies, and handle responses in multiple languages for global inboxes.

Crucially, Serif is approval-first: it never auto-sends anything without your sign-off, so you keep full control over what leaves your name. For low-risk, repetitive scenarios you can let it operate more autonomously after you've approved the pattern. In a crowded field that includes Superhuman, SaneBox, and Fyxer, Serif's differentiator is voice-accurate drafting plus assistant-style follow-through, rather than raw email-client speed.

Serif Pricing

Serif is a paid product with no permanent free plan. Every paid tier includes a 7-day free trial with full access — no credit card required, cancel anytime. Pricing was verified June 2026 on serif.ai/pricing.

• Lite — $30/mo: Entry plan for individuals — voice-matched draft replies, inbox triage and priority labels, and spam/marketing filtering on one connected inbox.
• Standard — $50/mo: Adds higher usage plus the fuller assistant feature set — automatic follow-up tracking, meeting summaries with task extraction, and playbooks/intake flows.
• Pro — $200/mo: For power users and high-volume inboxes — the highest usage allowance and the most autonomous handling of repetitive, low-risk email after approval.
• Team — $50/user/mo: Serif across an organization, billed per seat, so a whole team can offload inbox work.
• Enterprise — custom: Contact sales for custom usage, security, and admin requirements.

You can upgrade, downgrade, or cancel at any time from account settings; changes take effect at the end of the current billing period, and you keep access to everything you've paid for until then.

Key Features

• Voice-matched draft replies — Serif learns from your sent mail and pre-writes ready-to-send responses that mirror your tone, including how you write to different people, so emails sound like you and not a template
• Inbox triage & priority labels — Automatically sorts incoming mail into actionable categories, filters out spam and marketing, and surfaces the threads that need your attention first
• Automatic follow-up tracking — Watches outstanding threads and keeps nudging until they're resolved, so nothing slips through the cracks while you're heads-down
• Meeting summaries & tasks — Summarizes meetings, turns the next steps into clear follow-up tasks, and pre-drafts the follow-up emails for you to send
• Playbooks & intake flows — Runs repeatable processes such as document collection and onboarding intake automatically, so routine back-and-forth handles itself
• Tool integrations & lookups — Takes actions in connected systems like Stripe and Google Drive and looks up information in your tools to ground replies with accurate context
• Multi-language responses — Drafts customer responses across languages, useful for global inboxes and international support
• Approval-first control — Serif never auto-sends without your review; for low-risk, repetitive cases you can grant more autonomy after approving the pattern

Pros & Cons

Best For

• Founders and solo operators who answer their own email all day and want voice-accurate drafts plus automatic triage to claw back hours
• Sales professionals who need fast, personal replies and reliable follow-up chasing so prospects never go cold
• Small customer-facing teams that handle high inbound volume and want shared, on-brand responses with playbook-driven intake