6,622 tools, each one opened, scored and signed by a Toolio reviewer

Letterbot AI Chrome Extension

Limited to Gmail, may not suit users outside this platform.

Checked 4 Oct 2026 Reviewed by Alex Listed since September 2024

Screenshot of Letterbot AI Chrome Extension

At a glance

Starts at $5 per month Includes 100 daily requests. Beyond that, additional requests cost extra.
Free tier Yes, limited
Platforms Web
Best for Gmail email writers
Not for Email clients outside gmail

4.0 out of 5

Scored by Alex after real use

Our verdict

Letterbot AI excels at writing emails and replying contextually. It works well within Gmail but falls short without a free tier or broader compatibility.

✓What it does well

Smart repliesContextual smart reply suggestions based on the email thread.
Multi-language supportAid writers in 13 different languages.
Custom writing tonesChoose from five tones to match your communication style.

✕Where it falls short

Limited to GmailOnly integrates with the Gmail compose window, not other email clients.
No free plan beyond basicRequires payment for more than five daily requests even in its Basic plan.
Extra templates cost extraCustom templates are only available on the Professional tier, adding to costs.

Key features

Free tierOffers a free version with five daily requests.
Pricing tiersAvailable in Basic and Professional plans for varying request limits.
Template libraryProvides ready-made templates to help start writing emails.
Smart Thread Contextautomatically extracts email thread context

Questions about Letterbot AI Chrome Extension

What does the Letterbot AI Chrome Extension do?

Letterbot AI is a Chrome extension that writes emails and replies inside the Gmail compose window. It suggests contextual smart replies by automatically extracting the email thread's context, and it helps writers in 13 languages with a choice of five writing tones. A template library offers ready-made starting points.

Is the Letterbot AI Chrome Extension free?

The Letterbot AI Chrome Extension has a limited free tier that allows five daily requests. Paid use starts at $5 per month, which includes 100 daily requests, with additional requests costing extra. Custom templates are only available on the Professional tier.

Does the Letterbot AI Chrome Extension work outside Gmail?

No. Letterbot AI only integrates with the Gmail compose window and does not work with other email clients. Toolio lists it as best for Gmail email writers and not for people using email clients outside Gmail, and the reviewer counts the lack of broader compatibility as a drawback.

How does Toolio rate the Letterbot AI Chrome Extension?

The Letterbot AI Chrome Extension holds a Toolio score of 4.0 out of 5, given by Alex after real use on 4 Oct 2026. The reviewer says it excels at writing emails and replying contextually, and works well within Gmail. It has been listed on Toolio since September 2024.

What alternatives to the Letterbot AI Chrome Extension does Toolio list?

Toolio lists Inbox Narrator, Wuko AI, Buzz Mail and AIT Contacts Extractor for Gmail as alternatives. Inbox Narrator turns emails into voice notes but only works with Gmail, Wuko AI summarizes articles and sends insights by email, Buzz Mail suits sales professionals, and AIT Contacts Extractor pulls out key details to speed up replies.

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