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Email writing 2026 Rank: #1779

ForthWrite ✓

AI email writer that sounds like you.

Source rating 5.0 (1) 1k views 5 saves 3 comments Freemium
API AI Writing Tool Automated Email Drafting
More categories (4)
Email Writing Tool Personalized Writing Style Automated Email Replies Email writing
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Free + from $12/mo

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Verdict

A quick read before you dig into the full page.

Best if
AI email writer that sounds like you
Skip if
Limited weekly drafts on free plan
Pick this when
Learns your writing style

Considering Ellie - Your AI Email Assistant instead? Compare side by side

Overview

ForthWrite is an AI email writing assistant for Gmail and Outlook that learns your writing style from your real sent mail. The more you use it, the more it sounds like you. Get smart drafts in seconds, auto-draft replies before you open your inbox, and maintain your personal voice at scale. Free to start, no credit card required.

How it works

ForthWrite captures your tone, sentence rhythm, and sign-offs from your actual sent emails, then uses that profile to generate drafts that match how you write, not a generic AI voice. Every draft you edit or send improves the model over time.

Key features

- Auto-draft: replies waiting in Gmail before you open your inbox
- Voice matching from your real sent mail, not templates
- Recipient-aware drafts that adapt to who you are emailing
- Prompt Lab for version-controlling and A/B testing your persona prompt
- BYOK support: bring your own API key for Claude, OpenAI, Grok, Mistral, and more
- Works in Gmail and Outlook on the web, plus a standalone browser widget
- Training data export and full data portability



Start a 30-Day Free Pro Trial (no code needed, just follow the link):
https://www.forthwrite.ai/redeem/TAAFT30
ForthWrite website

Access & connections

Where you can use ForthWrite, and what it plugs into.

Platforms

Web Chrome Extension

Integrations

Outlook Chrome Gmail

API

Public API available

Auth: API key

Browse other tools with an API

Capabilities

What this tool accepts, produces, and is strongest at.

Input

  • Text

Output

  • Text

Highlights

  • API

Supported features

  • API

Pros & cons

Pros

  • Learns your writing style
  • Saves significant email time
  • Supports multiple AI models
  • No training setup required
  • Voice accuracy improves over time as more sent emails are collected
  • Batch-draft entire inbox with one click
  • Auto-drafts incoming emails
  • Context-aware thread understanding
Show 3 more
  • Can bring your own API for a discount
  • Detailed performance analytics
  • Free plan available

Cons

  • Limited to Gmail, Outlook
  • Model is pre-selected based on tier unless you provide your own API key
  • Data Wiping may lose personalization
  • Limited weekly drafts on free plan
  • Dependence on Chrome/Microsoft Marketplace for extension

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Releases 1

Initial release June 22, 2026 Current
Initial release of ForthWrite.

Imported reviews 3

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Seonix AI Aug 15, 2026 v@ initial release

Sounding like you is the right goal, and the giveaway is usually structure rather than vocabulary - people write shorter openings and messier sentences than any model does by default. How many of your own emails does it need before the voice holds up, and does it learn from replies that actually worked or from everything in the sent folder?

Santiago marrie Jun 22, 2026 v@ initial release

Truth and honest is very important in a relationship

Curtis Boortz Jun 19, 2026 v@ initial release

I've tried a lot of AI email tools and they all produce the same generic output. ForthWrite is different because it actually learns from the gap between what it drafts and what I end up sending. After a few weeks the drafts need almost no editing. Works right inside Gmail via the Chrome extension, so there's no new app to learn. The 60-day guarantee made it easy to commit. Highly recommend for anyone who sends a high volume of professional email.

FAQ 12

What is ForthWrite and how does it work?
ForthWrite is an AI-powered email writer designed to learn each user's unique writing style and form emails accordingly. The more emails a user sends, the more refined and accurate ForthWrite becomes. By integrating with email platforms like Gmail and Outlook, ForthWrite provides seamless functionality right inside the user's inbox. Featuring tools like Voice Match and Prompt Lab, ForthWrite can draft emails in the user's voice, while also offering the ability to manage prompts and make data-driven revisions ensuring the user's writing style is accurately mirrored.
What type of AI models does ForthWrite use?
ForthWrite utilizes a wide range of AI models such as OpenAI, Claude, Gemini, Grok, DeepSeek, Mistral, Perplexity, Cohere, and LibreChat. The choice of multiple AI models ensures that ForthWrite has a broad and comprehensive understanding of various prompts, enabling shorter learning curves and adaptability across different writing styles.
What is the 'Voice Match' feature in ForthWrite?
Voice Match is a proprietary feature of ForthWrite that analyzes a user's sent emails to capture their unique writing traits including tone, sentence rhythm, and signature sign-offs. As Voice Match progressively learns these traits, it helps ForthWrite compose emails that closely mimic a user's writing style, offering a more personalised and realistic experience.
Can ForthWrite be used with email platforms like Gmail and Outlook?
Yes, ForthWrite is designed to be seamlessly integrated with popular email platforms such as Gmail and Outlook. This integration offers users the convenience of drafting AI-assisted emails directly from their inbox, eliminating the need to switch between different applications.
What is the 'Prompt Lab' feature in ForthWrite?
The 'Prompt Lab' is a feature in ForthWrite that enables users to manage their prompts effectively. It allows users to test their prompts against their previously sent emails and receive suggestions based on their data for potential revisions. This iterative approach of testing and revising ensures the generated drafts improve in mirroring the user's distinct writing style.
How does ForthWrite handle data privacy?
ForthWrite prioritizes data privacy by following a 'Bring Your Own Key' principle. This means ForthWrite encrypts users' sent emails. The emails are isolated to each user's account and are never shared or used in shared models. Essentially, users maintain total control over their data by being the sole key holders.
What is the 'Bring Your Own Key' principle that ForthWrite operates on?
The 'Bring Your Own Key' principle followed by ForthWrite is a data privacy measure. It means that sent emails from a user are stored for learning the user's voice, but they are encrypted and tied exclusively to the user's account. They are not shared with other users nor used in training shared models. It is a way to secure the user's data and keep it isolated.
How does one manage prompts in ForthWrite?
In ForthWrite, prompts can be managed using the 'Prompt Lab' feature. Users can version-control their prompts, test them against their previously sent emails, and receive data-driven suggestions that can be used for revising and refining prompts. The facility to manage prompts allows for efficient optimization and aids in producing more accurate and personalized drafts.
What does ForthWrite mean by 'a unique training set is created for each user'?
When ForthWrite mentions 'a unique training set is created for each user', it means that the AI develops a distinct learning database from a specific user's sent replies and accepted drafts. This unique set of data aids in sharpening the AI's understanding of the individual user's writing style and tone, thereby improving the personalization and authenticity of future drafts.
How can I export my data from ForthWrite?
ForthWrite provides users with the option to export their data whenever they wish. Though specific steps are not outlined on their website, the feature reaffirms ForthWrite's commitment to user data privacy and ownership.
Does ForthWrite require any setup or training?
ForthWrite requires no setup or training. It is designed to adapt and learn from the user's inputs progressively, eliminating the need for any specialized training or complex setup procedures. You can start using it right away with its seamless integration to Gmail and Outlook.
How does ForthWrite emulate my writing style?
ForthWrite emulates a user's writing style by learning from the user's previous sent emails and accepted drafts. The AI understands the tone, sentence rhythm, typical sign-offs, and more, thereby enabling it to form highly personalised drafts that sound very much like the user. The model improves with each additional email sent to provide a sharply accurate emulation.
ForthWrite Free + from $12/mo
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