Alternatives to FollowUpThen

Carly AI is an email assistant you CC to delegate scheduling, follow-ups, CRM updates, and plain-English workflows.

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

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

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

Fast, private email hosting with your own domain, calendars, contacts and files, plus Masked Email to hide your real address.

Zinley is an autonomous personal agent that answers calls, handles email, and follows up without you prompting every step.

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

SaneBox AI email management sorts your inbox into smart folders so you waste fewer hours on low-priority mail.

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

AI meeting prep that emails you a research brief 4 hours before every external meeting.

AI email assistant that triages your inbox and drafts replies for $8.25/month.

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

Floatboat turns your calendar into an agent runtime that preps briefs, drafts, and follow-ups before you sit down.

Pally is a text-based AI assistant on iMessage, RCS, and Telegram that closes the loose threads buried across your other apps.

End-to-end encrypted email from Switzerland, bundled with VPN, Drive, and Pass

Town gives you a personal AI assistant that studies how you work, then handles your email, meetings, and recurring admin on its own.

Microsoft Outlook: unified email, calendar, contacts, and to-do across accounts, from free web and mobile apps to Microsoft 365 desktop clients.

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

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.

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.

Free iOS email client for Hotmail, Outlook, Gmail, Office 365, iCloud, Yahoo and Exchange — unified, private, and ad-free.

HEY Email is 37signals' rethink of email: a Screener vets first-time senders so only people you approve ever reach your Imbox.

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

myMail box is a free iOS email client that unifies Gmail, Outlook, iCloud and IMAP accounts with notes, Cloud, and Calendar.

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

Newton Mail is a cross-platform email client with read receipts, snooze, send later, and shared threads for Gmail, Outlook, and IMAP

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

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