Cheapest · Email & inbox agents · Prices checked October 21, 2026 to October 23, 2026
Cheapest AI email assistants (2026): 9 sorted by real price
9 AI email assistants sorted by price, cheapest first, using only the prices each vendor publishes, with the plan name, the source and the date we checked it. 4 have a free plan. Sorted by price only, never by payment.
Quick answer
- Cheapest: Mailbutler, whose lowest listed monthly plan is Starter: $4/user/mo (billed yearly; $5 monthly).
- Next cheapest: SaneBox (Snack: $4.54/mo (billed every 2 years)), Spark Mail (Plus: $10/user/mo ($99/yr)).
- Free plan: Spark Mail, Superhuman, AgentMail, Fyxer AI.
- Per user: Fyxer AI, Superhuman, Shortwave, Spark Mail, Inbox Zero and Mailbutler price per user or seat on at least one plan.
- Prices checked: October 21, 2026 to October 23, 2026, on each vendor's own pricing page.
AI email assistants by price
| # | Product | Lowest listed monthly plan | Free plan | All plans | Checked | Source |
|---|---|---|---|---|---|---|
| 1 | Mailbutler | Starter: $4/user/mo (billed yearly; $5 monthly) | No |
| October 23, 2026 | Source |
| 2 |  SaneBox | Snack: $4.54/mo (billed every 2 years) | No |
| October 21, 2026 | Source |
| 3 |  Spark Mail | Plus: $10/user/mo ($99/yr) | Free: $0 |
| October 21, 2026 | Source |
| 4 |  Superhuman | Pro: $15/member/mo ($12 billed yearly) | Free: $0 |
| October 21, 2026 | Source |
| 5 | Inbox Zero | Starter: $18/user/mo (billed yearly; $20/mo monthly) | No |
| October 22, 2026 | Source |
| 6 | AgentMail | Developer: $20/mo (10 inboxes, 10,000 emails/mo) | Free: $0 |
| October 21, 2026 | Source |
| 7 |  Cora | Professional: $20/mo (billed yearly as $240; 2 email accounts) | No |
| October 21, 2026 | Source |
| 8 |  Shortwave | Pro: $30/seat/mo | No |
| October 21, 2026 | Source |
| 9 |  Fyxer AI | Pro: $49/person/mo ($37 billed annually) | Free: $0 |
| October 21, 2026 | Source |
How we sorted: the lowest monthly price printed on each vendor's pricing page, cheapest first; products that only publish usage, yearly or quote pricing come last. Prices are copied from each vendor's public pricing page on the date shown; plan names and billing notes (per seat, billed yearly) are kept as the vendor writes them. "not published" or "Contact sales" means the vendor doesn't publish a price; we don't guess. Prices change; confirm with the vendor.
All 9, cheapest first
Email & inbox agents →-
Email
Mailbutler
Inbox extension for Gmail, Outlook and Apple Mail with an AI assistant that writes replies, summarizes threads and finds tasks.
Per seat$4/user/mo (billed yearly)
-
Email
SaneBox
Filters unimportant email out of your inbox into folders and sends digests; works with any email provider.
Subscription$4.54/mo (2-year billing)
-
EmailFree tier
Spark Mail
An email app with a smart inbox and AI that writes, summarises and organises email for individuals and teams.
Per seatFree; Plus $10/user/mo
-
EmailFree tier
Superhuman
The Superhuman AI suite (Grammarly's new name), including Superhuman Mail, a fast email client with AI replies and inbox triage.
SubscriptionFree; Pro $15/member/mo
-
Email
Inbox Zero
Open-source AI email assistant that sorts, labels and drafts replies, blocks cold email and bulk-unsubscribes.
Per seat$18/user/mo (billed yearly)
-
Agent infrastructureFree tier
AgentMail
Email inboxes built for AI agents to send, receive and act on email through an API.
SubscriptionFree; Developer $20/mo
-
Email
Cora
An AI email assistant from Every that screens your inbox, drafts replies and sends twice-daily briefs.
Subscription$20/mo (billed yearly)
-
Email
Shortwave
An AI email client for Gmail with an assistant that searches, summarises, organises and drafts email.
Per seat$30/seat/mo
-
AssistantsFree tier
Fyxer AI
An inbox assistant for Gmail and Outlook that sorts email, drafts replies in your voice and writes meeting notes.
Subscription · 3 use cases$49/mo
FAQ
What is the cheapest AI email assistant in 2026?
Of the 9 AI email assistants we list with verified pricing, the cheapest by listed monthly price is Mailbutler, whose lowest listed monthly plan is Starter: $4/user/mo (billed yearly; $5 monthly), checked October 23, 2026. With a free plan: Spark Mail, Superhuman, AgentMail and Fyxer AI. Cheapest isn't always best value: compare what each plan includes.
Is there a free AI email assistant?
Yes. Spark Mail: yes. Its Free plan is $0, checked October 21, 2026. Superhuman: yes. Its Free plan is $0, checked October 21, 2026. AgentMail: yes. Its Free plan is $0 (3 inboxes, 3,000 emails/mo), checked October 21, 2026. Fyxer AI: yes. Its Free plan is $0, checked October 21, 2026.
How much does an AI email assistant cost per month?
The lowest listed monthly plans run from $4/mo (Mailbutler) to $49/mo (Fyxer AI) across the 9 that print a monthly price. Prices checked October 21, 2026 to October 23, 2026.
Are these prices per user?
Some are. Fyxer AI, Superhuman, Shortwave, Spark Mail, Inbox Zero and Mailbutler price at least one plan per user or seat, so multiply by your team size. The others print a flat monthly price. Several also print a lower price for yearly billing; the table keeps the vendor's wording.
Can a vendor pay to be listed as cheaper?
No. The order is by price only, from each vendor's public pricing page on the date shown. Paid placements on AITeamGuide are always labelled "Sponsored" or "Featured" and never change this order.
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Work at a company on this page? Vendors can claim their listing for free or feature it with a label that says "Sponsored"; paid status never changes the order on this page. Building a different agent? List it here.
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