"AI email" is actually three separate problems wearing one name: triage (what deserves attention), drafting (writing replies faster), and search/recall (finding what someone told you in March). The four tools people actually shortlist each attack a different mix — which is why "which is best?" has no single answer, but "which is best for your inbox" does.
Superhuman — the full replacement ($30/mo)
Superhuman replaces your mail client entirely: split inbox triage, keyboard-first speed, AI-drafted replies in your voice, and follow-up reminders. It's the most complete answer on this list and the most expensive at $30/month (billed annually). The honest math: it pays for itself if email is a core work surface — founders, recruiters, sales, execs processing 100+ meaningful messages a day. If you get thirty emails and five matter, you're buying a sports car for a school run. Works with Gmail and Outlook accounts.
SaneBox — triage only, any client (from ~$7/mo)
SaneBox does one thing: it watches your mail behavior and moves unimportant messages into folders you review later. No new app to learn — it works behind Gmail, Outlook, Apple Mail, anything IMAP. It writes nothing and summarizes nothing. As a pure signal-to-noise fix at around $7/month, it's the option we'd point most overwhelmed people to first, precisely because it changes nothing about how you work.
Gemini in Gmail — the default you may already own
If your company runs Google Workspace, Gemini's email features (summarize threads, draft replies, answer questions about your mail) are increasingly bundled into plans you're already paying for. Quality is good and improving; the drafting is more generic than Superhuman's voice-matching, and triage is limited to what Gmail's tabs already do. But "already included" is a hard price to beat — check what your Workspace tier includes before buying anything on this page.
Shortwave — AI-native Gmail client (free tier; ~$8.50/mo)
Shortwave rebuilt Gmail as an AI-first client: its standout feature is search-and-recall — asking your inbox questions in plain English ("what was the final quote from the contractor?") and getting sourced answers. Bundling, snoozing, and AI summaries are solid. It's Gmail-only, which is its main limitation, and the one to try if finding things is your actual pain.
Pick by problem, not by hype
| Your real problem | Buy | Cost |
|---|---|---|
| Too much noise, keep my current app | SaneBox | from ~$7/mo |
| Email is half my job | Superhuman | $30/mo |
| Can never find past details | Shortwave | free / ~$8.50/mo |
| Already on Google Workspace | Try included Gemini first | often $0 extra |
One paragraph on security you shouldn't skip
Every tool here reads your mail — that's the product. Before connecting a work account, check three things: whether your employer's policies allow third-party mail access, what the vendor says about training on your data (all four state they don't train on customer mail content, but verify the current policy), and whether you can revoke OAuth access cleanly. Two minutes in your Google account's security settings after any trial is good hygiene.
Frequently asked questions
If you spend two or more hours a day in email and reply to most of it — usually yes, the speed compounds. Below that, SaneBox or included Gemini features capture most of the value at a fraction of the price.
Superhuman and SaneBox do. Shortwave is Gmail-only. Microsoft’s own Copilot for Outlook is the Workspace-Gemini equivalent on the Microsoft side.
Ruthless unsubscribing plus Gmail’s built-in tabs and filters, honestly. Every paid tool on this page works better on an inbox that’s already had the junk turned off at the source.
This article is independent editorial content. Pricing and plan details were checked against each vendor's own pricing page in July 2026 and can change at any time — always confirm before subscribing. Some links on Velkar AI may be affiliate links; they never affect our verdicts. See our Affiliate Disclosure and editorial process.