AI email tools compared - Replai vs Fyxer, Superhuman, SaneBox and more
Six side-by-side breakdowns: features, pricing, inbox access, and which tool wins for which use case. Find your fit before you sign up for anything.
Most AI email tools promise the same thing: less time in your inbox. The differences that matter are narrower. Does it write replies that sound like you, or generic text you rewrite anyway? Does it need ongoing access to your inbox - reading every message, storing thread history - or can it work from what you paste in? And what does the free tier actually hand you, versus what hits a paywall on day one?
This table compares Replai, Fyxer, Superhuman, SaneBox, Gemini for Gmail, and Microsoft Copilot on four things that count: features, free-tier quality, inbox access, and price. Replai's free reply tool needs no inbox connection and no account - we flag that wherever it shifts the comparison. For the wider market map, see the Replai alternatives guide.
Every feature, side by side
The real differences across 7 tools - reply drafting, inbox access, pricing, and platform support.
| Feature | Replai | Fyxer | Superhuman | SaneBox | Shortwave | Gemini | Copilot |
|---|---|---|---|---|---|---|---|
| AI reply drafting | ✓ | ✓ | ✓ | ✗ | ✓ | ✓ | ✓ |
| Inbox access required | No | Required | Required | Required | Required | Required | Required |
| Free plan | Yes | No | No | No | Limited | Personal tier | No |
| Paid plan starts from | TBA | ~$20/mo | $30/mo | $7/mo | $9/mo | Workspace plan | $30/user/mo |
| Learns your writing style | ✓ | ✓ | ✗ | ✗ | ✗ | ✗ | ✗ |
| Inbox organization | ✓ | ✓ | Basic | ✓ | ✓ | ✓ | ✓ |
| Meeting notes | ✓ | ✗ | ✗ | ✗ | ✗ | Via Workspace | Via M365 |
| Works with Gmail | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✗ |
| Works with Outlook | ✓ | ✓ | ✓ | ✓ | ✗ | ✗ | ✓ |
| Replaces your email client | No | No | Yes | No | Yes | No | No |
| No account to get started | ✓ | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ |
Which tool should you choose?
A fast read on what fits what you actually need - before you burn an afternoon testing all six.
You want AI-drafted replies without handing any tool access to your inbox. Works with Gmail, Outlook, or any client. Free to start, no sign-up.
Try it free →You want AI to run the inbox end to end - sorting incoming mail, flagging priorities, drafting replies on its own. Requires full inbox access.
Replai vs Fyxer →You handle hundreds of emails a day and want a keyboard-first, speed-tuned client with built-in AI. $30/month, no free plan, onboarding call required.
Replai vs Superhuman →Your inbox is buried in low-priority mail and you want automatic filtering - not AI reply writing. SaneBox sorts what arrives; Replai writes what you send.
Replai vs SaneBox →You live in Gmail and want an AI-native redesigned client with thread grouping, summaries, and reply suggestions built in. No Outlook support.
Replai vs Shortwave →Your org already pays for Google Workspace or Microsoft 365 and wants AI inside the tools you already use. Gemini handles Gmail; Copilot handles Outlook.
Replai vs Gemini →In-depth comparison pages
Each page digs deeper - key differences, exact pricing, privacy trade-offs, and a clear verdict on who should pick which tool.
Both draft replies and organize your inbox. The split: Fyxer needs full inbox access before it does anything. Replai works without connecting your email account at all.
Superhuman is a premium keyboard-first client that replaces Gmail or Outlook. Replai adds reply drafting to whatever client you already use - without the $30 a month.
SaneBox organizes your inbox. Replai writes your replies. Different problems, and plenty of people run both. This comparison shows which to prioritize and why.
Shortwave swaps your Gmail interface for an AI-native client. Replai works alongside your existing Gmail or Outlook - no migration, no account switch.
Gemini drafts generic replies from thread context. Replai learns how you personally write. Both work with Gmail - the difference is whether the output sounds like you or like an AI.
Copilot needs a Microsoft 365 license at $30/user/month and IT provisioning. Replai is free to use right now - no Microsoft account, no license, no IT approval.
Common questions
Which AI email tool is best in 2026?
It depends on your priority. Replai wins if you want replies without connecting your inbox. Fyxer wins for hands-off inbox management. Superhuman wins for speed-focused power users. Gemini for Gmail wins for Workspace subscribers who want AI built into Gmail at no extra cost.
Which AI email tools have a free plan?
Replai has a free plan with no inbox connection - generate replies right away without creating an account. Shortwave has a limited free tier. Gemini for Gmail runs on personal Google accounts with basic features. Fyxer, Superhuman, SaneBox, and Microsoft Copilot have no free plans.
Do all AI email tools require inbox access?
No. Replai is the only major AI email tool that skips OAuth inbox access. You paste the email you want to answer and it drafts a reply. Every other tool here - Fyxer, Superhuman, SaneBox, Shortwave, Gemini, and Copilot - makes you connect your Gmail or Outlook account first.
Can I use multiple AI email tools at the same time?
Yes. Plenty of people combine tools that solve different problems - say, SaneBox to filter incoming mail and Replai to draft replies. Tools that replace your client (Superhuman, Shortwave) are harder to layer, but Replai, SaneBox, and the platform assistants (Gemini, Copilot) run alongside each other without conflict.
Try Replai free - no inbox access required
Get a reply in your own words in seconds. No account to start, no email connection at any plan level.