Best AI Email Assistants in 2026
Updated
In short: Mailbutler Smart Assistant is ranked #1 of 46 as of 4 October 2026, ahead of Perplexity and Spark +AI. The best-ranked option with a free plan is Perplexity. The lowest first paid tier on this page is Replai at $0.50/mo.
If email is where your work queues up, an AI assistant may help prepare replies, sort incoming messages, or summarize long threads. Compared on AI reply drafting, inbox triage, thread summaries, follow-up actions, automatic sending, and supported email platforms, these tools cover different parts of the routine. Mailbutler Smart Assistant, Perplexity, and Spark +AI are among the named options to examine. Check whether each can send automatically or focuses on preparing work for you, and consider the free plan and paid-from price alongside platform compatibility. Those details can help you weigh how much assistance you want against the way you already handle email.
46 AI email assistants ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
#1 Mailbutler Smart Assistant Top pick · 8.1 Free plan · $7/mo #2 Perplexity Runner-up · 7.8 
#3 Spark +AI Also great · 7.6 Free plan · $10/mo
- Free planFree trial AndroidextensioniOSLinuxmacOSWebWindows
- Free plan
- Yes
- Paid from
- 4 /user/mo
- Inbox triage
- Yes
- AI reply drafting
- Yes
- Automatic sending
- No
- Thread summaries
- Yes
RecognisedDocumentedPlatformsFree planFree trial$7/mofirst paid tier About Mailbutler Smart AssistantVisit site - Free plan AndroidapiiOSmacOSWebWindows
- Free plan
- Yes
RecognisedDocumentedPlatformsFree planFree trial - Free planFree trial AndroidiOSmacOSWindows
- Free plan
- Yes
- Paid from
- 10 /user/mo
- Inbox triage
- Yes
- AI reply drafting
- Yes
- Automatic sending
- No
- Thread summaries
- Yes
RecognisedDocumentedPlatformsFree planFree trial$10/mofirst paid tier About Spark +AIVisit site - Free planFree trial AndroidextensioniOSmacOSWebWindows
- Free plan
- Yes
RecognisedDocumentedPlatformsFree planFree trial$12/mofirst paid tier About Superhuman GoVisit site - Free trial AndroidiOSmacOSWebWindows
- Free plan
- Yes
- Paid from
- 30 /user/mo
RecognisedDocumentedPlatformsFree planFree trial$30/mofirst paid tier About ShortwaveVisit site - Free plan AndroidiOSmacOSWebWindows
- Free plan
- Yes
- Paid from
- 4 /user/mo
RecognisedDocumentedPlatformsFree planFree trial$4/mofirst paid tier About SpikeVisit site - Free trial AndroidapiextensioniOSmacOSWebWindows
- Free plan
- No
- Paid from
- 12 /user/mo
RecognisedDocumentedPlatformsFree planFree trial$1/mofirst paid tier About DragVisit site - Free planFree trial extensionWeb
- Free plan
- Yes
- Paid from
- 12 /user/mo
- Inbox triage
- Yes
- AI reply drafting
- Yes
- Automatic sending
- No
- Thread summaries
- Yes
RecognisedDocumentedPlatformsFree planFree trial$1/mofirst paid tier About MailMaestroVisit site - AndroidiOSLinuxmacOSWebWindows
- Free plan
- No
- Inbox triage
- Yes
- AI reply drafting
- Yes
- Automatic sending
- Yes
- Thread summaries
- Yes
RecognisedDocumentedPlatformsFree planFree trial - Free trial AndroidLinuxmacOSWebWindows
- Free plan
- No
- Inbox triage
- Yes
- AI reply drafting
- Yes
- Automatic sending
- No
- Thread summaries
- Yes
RecognisedDocumentedPlatformsFree planFree trial$15/mofirst paid tier About MorningZeroVisit site - Free plan macOSWebWindows
- Free plan
- Yes
RecognisedDocumentedPlatformsFree planFree trial€12/mofirst paid tier About KernaVisit site - Free plan LinuxmacOSWindows
- Free plan
- Yes
- Inbox triage
- Yes
- AI reply drafting
- Yes
- Automatic sending
- No
- Thread summaries
- Yes
RecognisedDocumentedPlatformsFree planFree trial - Free trial AndroidapiextensioniOSself-hostedWeb
- Free plan
- No
- Inbox triage
- Yes
- AI reply drafting
- Yes
- Automatic sending
- Yes
- Thread summaries
- Yes
RecognisedDocumentedPlatformsFree planFree trial$20/mofirst paid tier About Inbox ZeroVisit site - AndroidiOSmacOSWebWindows
- Inbox triage
- Yes
- AI reply drafting
- Yes
- Automatic sending
- Yes
- Thread summaries
- Yes
RecognisedDocumentedPlatformsFree planFree trial$17/mofirst paid tier About MayleeVisit site - WebWindowsmacOSiOSAndroid
- Free plan
- No
- Paid from
- 14 /user/mo
RecognisedDocumentedPlatformsFree planFree trial$14/mofirst paid tier About MissiveVisit site - WebWindowsmacOSiOSAndroid
- Free plan
- No
RecognisedDocumentedPlatformsFree planFree trial$2.08/mofirst paid tier About Superhuman MailVisit site - Free plan Web
- Free plan
- Yes
- Inbox triage
- Yes
- AI reply drafting
- Yes
- Automatic sending
- No
- Thread summaries
- Yes
RecognisedDocumentedPlatformsFree planFree trial - Free plan Web
- Free plan
- Yes
- Paid from
- 12 /user/mo
RecognisedDocumentedPlatformsFree planFree trial$12/mofirst paid tier About Metis MailVisit site - Free plan Web
- Free plan
- Yes
- Paid from
- 6 /user/mo
- Inbox triage
- Yes
- AI reply drafting
- Yes
- Automatic sending
- No
RecognisedDocumentedPlatformsFree planFree trial$0.50/mofirst paid tier About ReplaiVisit site - WebWindowsmacOSiOS
- Free plan
- No
RecognisedDocumentedPlatformsFree planFree trial$30/mofirst paid tier About SerifVisit site - AndroidiOSWeb
- Free plan
- No
- Paid from
- 22.5 /user/mo
- Inbox triage
- Yes
- AI reply drafting
- Yes
- Automatic sending
- No
RecognisedDocumentedPlatformsFree planFree trial$22.50/mofirst paid tier About RevoVisit site - Free plan macOS
- Free plan
- Yes
RecognisedDocumentedPlatformsFree planFree trial$25/mofirst paid tier About DemiVisit site - Free trial AndroidiOSmacOSWeb
- Free plan
- No
- Paid from
- 50 /user/mo
- Inbox triage
- Yes
- AI reply drafting
- Yes
- Automatic sending
- No
RecognisedDocumentedPlatformsFree planFree trial$20/mofirst paid tier About KaiVisit site - LinuxWindowsmacOS
- Free plan
- Yes
RecognisedDocumentedPlatformsFree planFree trial - WebWindowsmacOSLinux
- Free plan
- Yes
- Inbox triage
- Yes
- AI reply drafting
- Yes
- Thread summaries
- Yes
RecognisedDocumentedPlatformsFree planFree trial
Is your tool on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which AI email assistant is ranked first on Specifiction?
Mailbutler Smart Assistant is ranked #1 of 46 with a score of 8.1. Perplexity is second and Spark +AI third.
How many of these have a free plan?
12 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, Replai has the lowest first paid tier we found: $0.50/mo.
How is this list ranked?
Ranked on what each maker publishes, the fullest spec sheet first: how deeply the product is documented, the platforms it runs on, a free tier or trial to test it, and its standing. Paid placements never change a rank.