Alternatives to Mailbutler

Spark Mail is a cross-platform AI email client that sorts, summarizes, and drafts across Gmail, Outlook, Exchange, iCloud, Yahoo, and IMAP.

Shortwave is an AI email assistant for Gmail that triages, drafts, schedules, and searches your inbox with Claude 4.6 models.

Jetwriter AI is a personalized AI writing assistant extension that drafts email and message replies in your voice across Gmail, Slack, LinkedIn, and other

Missive + AI folds GPT-powered summarize, translate, and reply drafting into a shared team inbox for email, SMS, WhatsApp, and chat.

Canary Mail is an AI email client with an on-device Copilot, PGP encryption, and a unified inbox for Mac, iOS, Windows, and Android.

Shortwave is an AI email assistant and native client where Claude 4.6 agents manage triage, drafting, scheduling, and search in your inbox.

AI-first email app that turns your inbox into a chat-style hub for email, docs, tasks, and calls

superReply is a Chrome extension that generates tone-matched AI email replies inside Gmail and Outlook Web. Free up to 90 replies a month.

Replai is an AI email assistant that learns your writing style and drafts replies in your own voice, plus inbox triage and meeting notes.

Cora is an autonomous AI email assistant that connects to Gmail, drafts replies in your voice, and sends you twice-daily briefs.

Gmail's Gemini 3 rebuild turns your inbox into a question-answering, thread-summarizing assistant

Jace is an AI executive assistant that sits on top of Gmail and Outlook to organize your inbox, draft replies with full context, and run email-triggered

Free email with AI compose, thread summaries, and a Planner that turns messages into tasks and calendar events.

WebMail is an AI-assisted unified inbox that merges Gmail, Outlook, Yahoo, iCloud, and custom-domain accounts into one app on iOS, Android, macOS, and Windows.

AI email rewriting tool for Gmail, Outlook, LinkedIn, and iOS with custom tones and Quick Replies.

Superhuman is AI email, docs, and a proactive Go assistant whose agents run inside Slack and your other work apps.

Saner is an AI personal assistant for ADHD that turns emails, notes, to-dos, and files into one searchable Smart Inbox.

A persistent-memory AI agent OS that runs your email, files, and research on a schedule.

Browser extension that drafts replies in one click across Gmail, WhatsApp, Slack and social DMs

Stamp is an AI secretary for email and calendar that drafts replies in your voice, prioritizes your inbox, and books meetings.

A Google Workspace Marketplace add-on that turns bullet notes into polished Gmail drafts using Gemini, inside the tab you already have open.

AI Gmail add-on that auto-drafts contextual email replies in your voice, ready for your review before sending

Mailopoly is an AI email assistant that folds email and business messaging into one Poly-powered inbox.

Free Chrome extension that drafts email replies, Excel formulas, code, and marketing copy on any site via ⌘+U.

Email-based AI reading companion that summarizes articles, YouTube videos, and PDFs — no signup required.

Dimension was a proactive AI coworker for email, Slack and calendar work — now winding down May 20, 2026.

Scape is a Mac email client that drafts replies from your email and meetings and records calls locally.

Slashy is an AI email client that drafts replies in your voice, chases follow-ups, and schedules meetings

Free iOS and Android email app that merges Gmail, Outlook, Yahoo, iCloud and Exchange into one inbox with 65GB of mail storage.

Avec turns Gmail into a swipeable task stack with hold-to-talk voice compose on iPhone.