ForthWrite
Summary
Most AI email tools give you a draft that sounds like everyone else's AI email tool — the same formal cadence, the same sign-offs, none of your actual rhythm. ForthWrite is built around that specific failure: it reads your sent mail, tracks your patterns, and gets measurably closer to your voice with every reply you accept.
The core workflow is a Chrome extension that sits inside Gmail or Outlook. Open a thread, click Generate Draft, and a reply appears — already shaped by your tone, sentence structure, and prior sign-offs. The vendor states a 'bring your own key' model, so you choose which LLM runs the draft: Claude for tone, GPT-4 for reasoning, or cheaper options when cost matters. Auto-draft goes further, writing replies in the background so drafts are queued before you open the inbox. The ceiling appears when your email patterns are thin — early users see generic output until the training set grows, and the tool ships no API, so teams integrating this into a broader automation stack will hit a wall immediately.
Bottom line: Pick ForthWrite if you personally send dozens of emails a day and want drafts that adapt to your voice over weeks — but if your team needs inbox automation piped into a CRM or ticketing workflow, there is no API to connect it.
Pricing Plans
SubscriptionLast verified 2 weeks ago- Price
- $15/mo
- Free Tier
- 10 free drafts per week, voice matching from sent emails, works in Gmail and Outlook on the web, widget UI + keyboard shortcuts
Free
For casual senders who want their drafts to sound less generic
- Fast drafts: solid replies in seconds
- Voice matching from your real sent emails
- 10 free drafts per week
- No API key or credit card required
- Works in Gmail and Outlook on the web
- Widget UI + keyboard shortcuts
Standard
For professionals who care how their writing reads
- Smarter drafts: a sharper model that matches your tone
- Custom system prompt (persona)
- Recipient-aware drafts (style adapts to who you're emailing)
- Intent-aware drafts (a follow-up reads differently than an intro)
- AI coaching with voice-shift reports
- Voice dictation: speak your draft instead of typing it
- Unlimited drafts
- Connect unlimited Gmail & Outlook inboxes
- Email support
Pro
For power users who want their inbox drafted before they arrive
- Auto-draft: replies waiting when you open Gmail
- Batch: clear dozens of threads in parallel
- Drafts that grow more like you each week (edit supervision)
- Performance analytics with a measurable improvement curve
- Prompt Lab - version control, A/B test, AI-optimized
- Training data + smart retrieval (RAG) + full export
- Premium frontier AI model, tuned for nuance
- Everything in Standard
- Priority support
Teams
Teams Pro drafting for every seat, coordinated as a team
- Everything in Pro, for every seat
- Shared team persona and Prompt Lab library
- Team analytics dashboard
- Admin seat management and invites
- 30-day team trial
- 2 seat minimum
Enterprise
SSO/SAML, SCIM provisioning, audit logs, and a dedicated account manager on top of Teams
- SSO/SAML authentication
- SCIM provisioning + audit log
- Custom DPA / volume licensing
- Dedicated account manager
View full pricing on forthwrite.ai →
Pricing may have changed since last verified. Check the official site for current plans.
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Pros
Sign in to edit- Voice matching trained on your actual sent mail, which means drafts reflect your sentence length, tone, and sign-offs rather than a generic professional register — avoiding the tell-tale AI cadence that recipients recognize.
- Bring-your-own-key support across nine LLM providers, so you can swap models when API costs spike or when a specific provider's tone output is better for a given context — no other email drafting tool in the category offers this at draft time.
- Auto-draft runs in the background as email lands and batches replies in parallel, so you open the inbox to a queue of waiting drafts rather than a queue of blank compose windows.
- A performance analytics dashboard tracks acceptance rate, similarity score, and edit distance over time, which means you can confirm the voice match is actually improving rather than taking it on faith.
- Prompt Lab lets you version-control and A/B test prompts against your own sent mail, so you can tune draft behavior for specific correspondences — like client updates versus internal requests — without rebuilding from scratch.
Cons
Sign in to edit- Voice match quality is thin during the early period before the training set has enough accepted drafts to pattern on. New users without a dense sent-mail history get output closer to a generic draft than a personalized one — the tool requires patience before it delivers on its core promise.
- There is no API. Any team that wants to connect ForthWrite to a CRM, helpdesk, or outbound sequence tool cannot do it. At the point where inbox automation needs to touch another system, teams switch to tools like Zapier-integrated alternatives or purpose-built sales engagement platforms that expose webhook or API endpoints.
- The product is a single-user instrument. Shared inboxes, team aliases, or organizations that want a consistent brand voice across multiple senders have no mechanism to share a voice profile or enforce tone settings across accounts — teams with that requirement are looking at a different category of tool entirely.
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About
- Platforms
- Chrome extension, Gmail, Outlook, browser
- API Available
- No
- Self-Hosted
- No
- Last Updated
- 2026-06-30T09:09:35.375Z
Best For
Who it's for
- Professionals who send many emails daily
- Users wanting AI drafts that match their voice without training
- Gmail and Outlook power users seeking browser integration
What it does well
- Drafting professional email replies in personal writing style
- Handling high-volume email inboxes with batch auto-drafts
- Maintaining consistent tone across business correspondence
Integrations
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Frequently Asked Questions
- Is ForthWrite free?
- ForthWrite has a permanent free tier alongside paid upgrades (paid plans from $15/mo). You can keep using a baseline version indefinitely without paying.
- Is ForthWrite open source?
- No — ForthWrite is a closed-source tool. Source code is not publicly available.
- What platforms does ForthWrite support?
- ForthWrite is available on: Chrome extension, Gmail, Outlook, browser.
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ForthWrite is a Chrome extension that drafts email replies inside Gmail and Outlook, pulling from your sent mail history to match your tone, sentence rhythm, and sign-offs. The vendor describes a three-step flow: install the extension, set a persona in two minutes, then click Generate Draft on any thread. The reply it produces reads the full thread — including forwards and nested messages — and addresses every open question, not just the last message. Every draft you accept and every edit you make feeds a private training set, and a performance dashboard tracks acceptance rate, similarity score, and edit distance so you can see the voice match tightening over time.
The differentiating feature is model choice. ForthWrite supports nine LLM providers — OpenAI, Claude, Gemini, Grok, DeepSeek, Mistral, Perplexity, Cohere, and LibreChat — and lets you bring your own API key. You choose the model per use case: the docs suggest Claude for tone and Grok when cost is the constraint. No other email drafting tool in this category offers that provider flexibility at the point of draft generation. The vendor states your BYOK credentials are encrypted at rest, your sent mail is stored in an isolated account and never used to train shared models, and a one-click data wipe is available at any time.
ForthWrite fits professionals with high personal email volume who want drafts that sound like them without copy-pasting threads into a chat interface. Community feedback on G2 and the Chrome Web Store points to time savings and tone quality as the standout outcomes. Where it breaks: there is no API, so the tool cannot be embedded in a team helpdesk, CRM, or automation pipeline. It is also a solo instrument — shared inboxes and team-level voice consistency are outside what the product addresses. Teams that need outbound email automation at scale or multi-user inbox tooling will need a different solution.