5 Best Stamp Alternatives in 2026
Stamp (YC W25) is an “AI-native inbox.” It replies to email in your voice, lets you write filters in plain English to prioritize and group messages, and automatically pulls summaries and action items out of every thread. The composing experience is editor-like — inline autocomplete and highlight-to-edit, the way a code assistant works. It’s been free during an intro period and is aimed at people drowning in 100+ emails a day.
Stamp is sharp at the inbox, but it stops at the inbox. There’s no calendar to manage, no scheduling, no contacts/CRM, no meeting recording — the rest of the executive-assistant job. If you want more than a smarter mail client, here are five alternatives.
1. Carly
Carly is a full AI executive assistant you reach over email and text. It does the inbox work Stamp does — triaging mail and drafting replies in your voice — and then keeps going: it schedules and reschedules meetings, maintains a contacts/CRM record, manages tasks with time-blocking, records meetings, sends daily briefings, and runs email sequences.
What makes it different from Stamp: Stamp is an inbox you read and reply from; Carly is an assistant that handles email and calendar, scheduling, and CRM. It works alongside your existing Gmail or Outlook rather than replacing your mail app, and includes a free, no-signup group-availability grid.
Best for: People who like Stamp’s drafting but need calendar, scheduling, and contact management too.
Pricing: starts at $35/month
2. Fyxer
Fyxer is autonomous email triage: it categorizes your inbox, writes tone-matched draft replies, and takes meeting notes, for Gmail and Outlook.
What makes it different from Stamp: Fyxer works in the background of your existing inbox rather than as a new client, and adds meeting notes. Strong overlap on drafting. See Fyxer alternatives.
Best for: People who want background triage and drafts in the inbox they already use.
3. Shortwave
Shortwave is an AI-native Gmail client with natural-language search, Ghostwriter for voice-matched drafting, and automations connecting email to tools like Slack, Notion, and Asana.
What makes it different from Stamp: Shortwave is a more mature Gmail client with stronger search and integrations, but Gmail-only. See Shortwave alternatives.
Best for: Gmail users who want a polished AI client with integrations.
4. Superhuman
Superhuman is a fast, keyboard-driven email client with AI drafting, summaries, and follow-up reminders, for Gmail and Outlook.
What makes it different from Stamp: Superhuman optimizes for speed and keyboard flow rather than action-item extraction, and it covers Outlook. Paid.
Best for: Power users who want the fastest possible inbox across Gmail and Outlook.
5. Lindy
Lindy is an AI executive assistant for email and calendar, reachable over iMessage, that drafts, sorts, books meetings, and automates workflows.
What makes it different from Stamp: Lindy reaches past the inbox into calendar and multi-step automation, controlled by message rather than a client UI. See Lindy alternatives.
Best for: People who want inbox plus calendar handled by one assistant.
Stamp Alternatives Compared
| Tool | Scope | Outlook | Calendar / scheduling | Voice-matched drafts | Starting price |
|---|---|---|---|---|---|
| Carly | Full EA | Yes | Yes | Yes | $35/mo |
| Fyxer | Inbox triage | Yes | No | Yes | From $30/mo |
| Shortwave | Gmail client | No | Light | Yes | Free / $8/mo |
| Superhuman | Email client | Yes | Light | Yes | $30/mo |
| Lindy | Full EA | Limited | Yes | Yes | Usage-based |
A smarter inbox vs. a full assistant
If your problem is purely email volume and reply speed, Stamp’s plain-English filters and voice-matched drafts are well-built — and the free intro is hard to argue with. If the inbox is only half your admin load and you also lose time to scheduling, follow-ups, and meeting notes, you want an assistant rather than a client. Carly keeps the drafting strength and adds the calendar, scheduling, and CRM work Stamp leaves out.
More: Best AI email assistants · Best AI inbox management tools · Best AI personal assistants
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"Before Carly, I relied on a Calendly link, but the whole process felt impersonal and not very professional. Carly changed that by handling all the back-and-forth, so I'm no longer stuck in endless email threads trying to line up schedules.
Now Carly reaches out to candidates, shares my real-time availability, lets them pick a slot, then sends a Zoom link and drops it straight into my calendar. She sends reminders to both of us before each call, which has significantly reduced no-shows and last-minute confusion.
On top of scheduling, Carly acts like a full executive assistant, sending me my schedule the night before so I can prepare for each call. It reminds me of the old x.ai assistant, but Carly is noticeably smarter, faster, and better suited to my healthcare recruitment business."
