ForthWrite

ForthWrite is an email assistant that drafts replies in a style learned from your sent messages. It best suits client-facing professionals and services firms that value a consistent personal voice; the free tier is a useful trial, while attachment handling and paid-plan requirements limit its fit for some workflows.

Overview

ForthWrite uses the current thread plus a profile built from sent-email snippets to produce reply drafts. Tone controls and custom instructions let you adjust the result when the learned style is not appropriate for a particular client or situation. This focused approach is more relevant to recurring correspondence than to users seeking a broad writing workspace.

The free plan works in Gmail and Outlook on the web. An Outlook add-in extends support to Outlook desktop on Windows and Mac. Slack drafting is available through message and compose shortcuts or the /forthwrite command, but only on Standard or Pro. The Claude connector can create a draft or provide a contact summary; it cannot send mail or open a mailbox.

Key features

Voice and drafting controls

Learning from sent messages can make replies more consistent with an individual's established client voice. Thread context keeps the draft tied to the conversation, while tone controls and custom instructions provide practical overrides. The limitation is important: ForthWrite does not currently read or analyze email attachments, so attachment-heavy correspondence still requires manual review and composition.

Privacy and administration

Routine thread content is not retained after a draft is returned, while sent-email snippets are stored to learn the user's voice. That trade-off favors personalization but may matter to organizations with strict retention rules. ForthWrite says it passed Google's CASA Tier 2 assessment for its restricted, read-only Gmail scope. Teams owners and administrators can view and export review records containing drafts, revisions, sent text, model information and timestamps, creating useful oversight but also a substantial record of writing activity.

Model and workflow options

The Outlook page lists bring-your-own-key support for OpenAI, Anthropic, Google, xAI, DeepSeek, Mistral, Perplexity, Cohere and Groq. Browser extension support, custom instructions and support for both major mail clients make the core workflow adaptable, though Slack access is reserved for higher plans.

Pricing

Free

Free costs nothing and allows 10 drafts per week in Gmail and Outlook on the web. It excludes a custom persona, auto-draft, batch drafting, coaching, analytics and dictation. This is enough for occasional client email and a low-risk evaluation, but the weekly cap and missing automation make it unsuitable for sustained high-volume use.

Pro

Pro is $24 a month, with the page also showing $29/mo; annual billing is shown as $288/yr. It adds unlimited drafts, auto-draft, batch drafting, a custom persona, RAG, dictation and priority support. Choose it when one user needs frequent drafting and automation. It does not provide the shared team persona, Prompt Lab or team review and analytics found in Teams.

Teams

Teams is $59 a month, with the page also showing $79 per seat per month and a 25% saving; a two-seat minimum applies. It includes Pro features plus a shared team persona, Prompt Lab, review records and team analytics, and has a 30-day trial. The seat minimum raises the entry cost, but the plan is the logical choice for firms that need shared standards and administrative review.

ForthWrite is freemium and offers a 14-day trial; Teams specifically includes a 30-day trial. Paid access is necessary for Slack drafting and the advanced automation that distinguishes the service from its free tier.

Platforms

ForthWrite offers an API, browser extension, macOS and Windows support, and a web app. Free email use covers Gmail and Outlook on the web, while desktop Outlook access comes through the Windows and Mac add-in.

Who it's for

This is a strong fit for consultants, agencies and other professionals who write client email repeatedly and want drafts aligned with their own voice. Individuals can start with the capped free plan; busy solo users should consider Pro for unlimited and automated drafting. Teams that need a common style, review history and analytics should use Teams. Users whose work depends on interpreting attachments, or who need Slack on a free plan, should look elsewhere.

Pros and cons

• Pros: Sent-email learning targets consistent, personal-sounding replies; thread context, tone controls and custom instructions improve control; broad BYOK provider support; a read-only Gmail security assessment and non-retention of routine thread content address important privacy concerns.
• Cons: The free plan allows only 10 drafts per week and omits automation and personalization; attachments are not analyzed; Slack requires Standard or Pro; Teams requires at least two seats and exposes detailed review records to owners and admins.

Alternatives

See the AI Email Writing Tools list for more choices. Pick WPS AI Email Writer if you want unlimited free email writing with no signup or ads across mobile, desktop and web. Choose WriteMail.ai if you prefer clearly metered monthly plans from 50 to 500 AI emails. AI Perfect Assistant fits users wanting Microsoft 365, Chrome and Telegram integrations, including a 10-token free plan. Choose Kerna for token-based plans with a broad feature set across macOS, web and Windows. Ellie is worth considering for a free daily allowance and one connected account. GPT for Gmail is an alternative centered on Google Workspace Chrome extensions. Demi is a macOS-only option with a free digest plan. Flailo offers API and web access with a 50-email monthly starter allowance.

Verdict

Choose ForthWrite if your priority is client-email drafts that follow your established voice, especially as a solo professional on Pro or a firm using Teams' shared persona and review tools. Its main reason to look elsewhere is the combination of no attachment analysis, a tightly capped free tier and paid requirements for Slack and team capabilities.