Best AI Email Assistants in 2026: A 5-Person Team Pays $42 to $495 a Month, and Gmail or Outlook Decides Half the List

The short answer

Short answer, checked on 7 October 2026: for a 5-person team, billed monthly, an AI email assistant costs $42 to $495 a month. The low end is AI you may already pay for: Google Workspace Business Starter includes Gemini in Gmail at $8.40 a user, and Microsoft includes Copilot Chat, which can read your Outlook inbox, with eligible Microsoft 365 business plans at no additional cost. Bought separately, Shortwave, Superhuman Starter and Lindy Plus each come to about $150 a month for 5 seats, Superhuman with auto drafts to $200 and Fyxer Pro to $245. The first filter is your mail provider: Shortwave is Gmail only, and only SaneBox works with any IMAP server.

Tool and plan	5 seats, billed monthly	5 seats, billed annually	Works with
Google Workspace Business Starter (Gemini in Gmail)	$42	$35	Gmail (Workspace)
SaneBox Snack (1 email account)	$47.45	$27.10	Gmail, Microsoft 365, any IMAP
Microsoft 365 Copilot Copilot Business add-on	$126	$105	Outlook (Microsoft 365)
Lindy Plus (3,000 credits each)	$149.95	No annual price	No provider named on pricing page
Shortwave Business	$150	No annual price	Gmail only
Superhuman Starter	$150	$125	Gmail, Outlook
Superhuman Business (auto drafts)	$200	$165	Gmail, Outlook
Fyxer Pro	$245	$185	Gmail, Outlook
Fyxer Team	$495	$320	Gmail, Outlook

What Google’s answer gets wrong about cost

When we captured Google’s AI Overview for “best ai email assistant” on 5 October 2026, it filed Microsoft Copilot for Outlook and Gemini in Workspace under “Best Built-In & Zero Cost”. That is half right. Gemini in Gmail is checked on every Google Workspace business plan, from Business Starter at $7 a user a month on a yearly commitment or $8.40 without one, so it costs nothing extra if you already pay for Workspace. On Microsoft’s side, Copilot Chat is included in Business Basic, Standard and Premium, and Microsoft Learn says Copilot Chat in Outlook works on your inbox and calendar for eligible users without a Copilot license. The full Copilot in Outlook is a paid add-on: $21 a user a month on a yearly plan ($18 as a first-year promotion running to 31 December 2026) or $25.20 month to month.

The same answer called SaneBox “Best Budget / Lightweight Filter”. SaneBox’s pricing page opens on a price billed every 2 years, $4.54 a month for Snack. Billed monthly, Snack is $9.49. It is still the lowest-priced add-on here, but the headline figure assumes a 2-year commitment. And it described Superhuman’s “automated replies that mimic your writing style”: Superhuman lists Auto drafts under Business ($40 a member billed monthly), not Starter ($30).

Pick by mail provider first

Half of this list is decided before price comes into it:

• Gmail or Google Workspace: Gemini in Gmail, Shortwave, Superhuman, Fyxer and SaneBox. Shortwave connects natively to Gmail and Google Workspace only.
• Outlook or Microsoft 365: Superhuman, Fyxer, SaneBox and Microsoft Copilot. Shortwave can reach an Outlook account only by first connecting it to a Gmail account.
• Any other IMAP host (iCloud, Yahoo, Fastmail, your web host): SaneBox, which names any IMAP, Microsoft Exchange or ActiveSync server.
• Lindy: its pricing page lists inbox management and connecting 2 to 5 inboxes depending on plan, but names no provider, so check before you buy.

Cost per hour each vendor says it saves

Three vendors publish a number for time saved. These are their claims, not our measurement, but they let you price a seat against an hour. A month is 4.33 weeks.

Tool	Vendor claim	Hours a month	Per claimed hour, monthly billing	Per claimed hour, annual billing
Superhuman	“Save 4 hours per person every single week”	17.3	$2.31 (Business)	$1.90
Fyxer	5.6 hours, “Average time saved per user each week”	24.3	$2.02 (Pro)	$1.52
SaneBox	“save you up to 3-4 hours per week on email” (low end used)	13.0	$0.73 (Snack)	$0.42

Read the other way: on its own claim, a Superhuman Business seat pays for itself if an hour of that person’s time is worth more than $2.31, Fyxer Pro above $2.02, SaneBox Snack above $0.73. Whether the claimed hours show up for your team is what the free plans and trials below are for.

The tools, one by one

Superhuman

Superhuman is a mail client for teams on Gmail or Outlook. Starter is $30 a member a month billed monthly or $25 billed annually; Business, which adds Auto drafts, Ask AI and custom auto labels, is $40 or $33. The page marks Business “15% off for teams of 5+” without saying whether $33 already includes it, so we quote list. Neither pricing page mentions a free plan or trial. Superhuman’s claim is 4 hours saved per person a week.

Shortwave

Shortwave is a Gmail client with an AI assistant. It has a Free plan, Pro at $18 a seat for individuals, and team plans Business $30, Premier $45 and Max $120 a seat a month, with a 14-day trial. Billing is monthly only. Usage is a daily quota: roughly 150-300 AI requests a day on Business and 300-600 on Premier at the Standard intelligence level. Outlook, Fastmail and Yahoo accounts work only through a connected Gmail account.

Fyxer

Fyxer sorts the inbox, drafts replies and takes meeting notes in Gmail or Outlook. Pro is $49 a person a month billed monthly or $37 billed annually; Team is $99 or $64. Both have a 14-day trial, and Enterprise starts at 50 users. Usage is metered in credits: unlimited for the first 3 months, then 3,000 a month per Pro member and 6,000 per Team member, pooled. Sorting costs 0.2 credits an email, a chat message 20, a recorded minute 1. Fyxer’s own example of a Pro month is 5,000 sorted emails, 25 recording hours and 25 chat messages, which is exactly 3,000 credits; sorting alone would cover 15,000 emails. The Free plan gives 400 credits (about 20 chat messages) and does not draft replies or sort the inbox. Its claim is 5.6 hours saved per user a week. Fyxer also records meetings, which overlaps with the AI note takers we compared separately.

SaneBox

SaneBox filters mail into folders on the server, so it works with whatever client you already use, on Gmail, Microsoft 365, iCloud, Yahoo, Fastmail or any IMAP or Exchange server. It does not draft replies. Plans are priced by email accounts: Snack (1 account, 2 features) $9.49 a month billed monthly, $5.42 annually, $4.54 billed every 2 years; Lunch (2 accounts, 6 features) $15.99; Dinner (4 accounts, all features) $42.99. There is a 7-day trial and no free plan, with 25% off for education, non-profits and government. SaneBox claims up to 3 to 4 hours saved a week. We have no review page for it yet.

Lindy

Lindy is a general AI assistant whose plans include inbox management and drafting replies in your voice. Plus is $29.99 a user a month with 3,000 credits, Pro $99.99 with 15,000, Max $199.99 with 35,000; you start with $50 in free credits and no credit card. Drafting a reply is one of its “Everyday Asks” at 2 to 250 credits, so Plus’s 3,000 credits cover between 12 and 1,500 of them a month. Credits pool across the team, do not roll over, and when they run out Lindy pauses until the next cycle. Sending an email waits for your approval.

Gemini in Gmail (Google Workspace)

Google Workspace lists Gemini in Gmail, to find, summarize and write emails, on Business Starter, Standard, Plus and Enterprise. List prices per user a month are Starter $7, Standard $14 and Plus $22 on a yearly commitment, or $8.40, $16.80 and $26.40 without one, with a 14-day trial and a 300-user cap. Starter limits Gemini in the other Workspace apps. Unlike every add-on here, that price includes the mailbox.

Microsoft 365 Copilot in Outlook

Microsoft 365 Copilot comes in two layers. Copilot Chat is included in Microsoft 365 Business Basic ($7 a user a month paid yearly), Standard and Premium, and in Outlook it can answer from your inbox, calendar and meetings for eligible users without a Copilot license. Copilot in Outlook proper is marked “Priority” on the paid tiers: the Copilot Business add-on at $21 a user a month yearly or $25.20 monthly, or bundles such as Business Standard with Copilot at $23.50 yearly or $28.20 monthly. For 5 people that bundle is $117.50 a month on a yearly plan, mailbox included. The add-on has a one-month trial that needs a credit card, and both cap at 300 users.

Which one for which team

• You already pay for Workspace or Microsoft 365: try Gemini in Gmail or Copilot Chat in Outlook before adding a seat anywhere; the extra cost is $0.
• You want a quieter inbox and keep your client: SaneBox, $47.45 a month for 5 people billed monthly, on any IMAP host.
• You want drafted replies in Gmail on a budget: Shortwave Business, $150 a month for 5, monthly only.
• You are on Outlook and want drafts plus meeting notes: Fyxer Pro, $245 monthly or $185 on annual billing for 5.
• You want one assistant for email and other work: Lindy Plus, $149.95 for 5, watching the credit meter.

Email assistants touch the same pipeline as outreach tools, so if the goal is more replies to sales mail, read what AI sales tools do to CAC too.

How we checked

Every price, plan, allowance and claim was read on 7 October 2026 on the vendor’s own pricing page, product page or Microsoft Learn, in a rendered browser, with each billing toggle clicked and saved separately. The 5-seat totals and cost per claimed hour are our arithmetic on those list prices; the SaneBox total assumes one Snack subscription per person, because it prices by email account, not seat. We did not test these assistants on our own inboxes for this article, and no score in the boxes above was changed for it. The Google quotes are from our capture on 5 October 2026.

Related reading on this site

• AI note takers compared: Fyxer and Copilot both take meeting notes; here are the dedicated tools.
• AI sales tools and what they do to CAC: what AI tools do to the cost of winning a customer.
• AI tools for lead generation: where the replies these assistants draft come from.
• Open source alternatives to paid AI tools: the same cost test applied to other paid AI tools.

Questions people ask about AI email assistants

What is the best AI email assistant for Gmail?

For Gmail, the options checked on 7 October 2026 are Gemini in Gmail (included from Google Workspace Business Starter, $8.40 a user a month), Shortwave (Gmail native, Business $30 a seat), Superhuman (from $30), Fyxer (Pro $49) and SaneBox (Snack $9.49), all billed monthly. Pick by whether you want drafting (Shortwave, Superhuman Business, Fyxer) or filtering (SaneBox).

What is the best AI email assistant for Outlook?

Superhuman, Fyxer and SaneBox all support Outlook or Microsoft 365, and Microsoft’s own Copilot Chat in Outlook comes with eligible Microsoft 365 business plans. Full Copilot in Outlook is $25.20 a user a month on monthly billing as an add-on. Shortwave reaches Outlook only through a Gmail account. Checked 7 October 2026.

Is there a free AI email assistant?

Yes, with limits, as of 7 October 2026: Shortwave has a Free plan; Fyxer Free gives 400 credits a month but no drafted replies; Lindy starts with $50 in free credits; Microsoft includes Copilot Chat, which works in Outlook, with eligible Microsoft 365 business plans. Superhuman and SaneBox have no free plan; SaneBox has a 7-day trial.

How much does Fyxer AI cost?

Fyxer Pro is $49 a person a month billed monthly or $37 billed annually; Team is $99 or $64. There is a Free plan and a 14-day trial; Enterprise starts at 50 users. Pro includes 3,000 credits a month after the first 3 months. Read on 7 October 2026.

How much does SaneBox cost?

Billed monthly, Snack is $9.49, Lunch $15.99 and Dinner $42.99 a month. The $4.54 figure on its pricing page is Snack billed every 2 years. 7-day trial, no free plan. Read on 7 October 2026.

Is Microsoft Copilot in Outlook free?

Copilot Chat is, for eligible Microsoft 365 subscriptions, and in Outlook it can use your inbox and calendar without a Copilot license. Full Copilot in Outlook needs the Copilot Business add-on at $21 a user a month yearly ($18 first-year promotion to 31 December 2026) or $25.20 monthly. Checked 7 October 2026.

How many hours does an AI email assistant save?

Only the vendors’ own claims exist: Superhuman says 4 hours per person a week, Fyxer 5.6 hours per user a week, SaneBox up to 3 to 4 hours a week. Shortwave, Lindy, Google and Microsoft publish no number. We have not measured it.

Sources

1. Superhuman Mail pricing, read 7 October 2026.
2. Superhuman Mail, read 7 October 2026.
3. Shortwave pricing and FAQ, read 7 October 2026.
4. Fyxer pricing, read 7 October 2026.
5. Fyxer for small and medium businesses, read 7 October 2026.
6. SaneBox pricing, read 7 October 2026.
7. SaneBox home page and FAQ, read 7 October 2026.
8. Lindy pricing, read 7 October 2026.
9. Google Workspace pricing, read 7 October 2026.
10. Microsoft 365 Copilot for business pricing, read 7 October 2026.
11. Microsoft 365 business plans and pricing, read 7 October 2026.
12. Microsoft Learn: Microsoft 365 Copilot Chat overview, read 7 October 2026.
13. Google results for “best ai email assistant” (our SerpAPI capture), read 5 October 2026.