Software Alternatives, Accelerators & Startups

Swimm VS ForthWrite

Compare Swimm VS ForthWrite and see what are their differences

Swimm logo Swimm

A documentation tool built for developers

ForthWrite logo ForthWrite

Email that sounds like you, and gets measurably more like you every week. Drafts in Gmail, Outlook, and the browser. Free to start.
Visit Website
  • Swimm Landing page
    Landing page //
    2023-08-03
  • ForthWrite Landing Page
    Landing Page //
    2026-06-19
  • ForthWrite Dashboard
    Dashboard //
    2026-06-19
  • ForthWrite In Gmail
    In Gmail //
    2026-06-19
  • ForthWrite Pricing
    Pricing //
    2026-06-19

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. Works inside Gmail and Outlook on the web.

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

Who uses it

Professionals who send high volumes of relationship-critical email: lawyers, financial advisors, recruiters, account executives, founders, and anyone who wants their inbox handled without sounding like a chatbot wrote it.

Pricing

Free tier includes 10 drafts per week with no credit card required. Paid plans start at $12/month and include unlimited drafts, custom persona prompts, and auto-draft.

ForthWrite

$ Details
freemium $12.0 / Monthly (Standard plan)
Platforms
Web
Release Date
2026 June
Startup details
Country
United States
State
California
City
San Diego
Founder(s)
Curtis Boortz
Employees
1 - 9

Swimm features and specs

  • Integration with IDEs
    Swimm provides seamless integration with popular Integrated Development Environments (IDEs) like VS Code, enabling developers to access documentation directly within their coding environment.
  • Automatic Documentation Updates
    Swimm automatically updates documentation as the code changes, ensuring that documentation stays current and reducing the burden on developers to manually update it.
  • Onboarding and Knowledge Sharing
    Swimm facilitates smooth onboarding for new team members by providing easy access to up-to-date code documentation, enhancing knowledge transfer and team collaboration.
  • Code-Coupled Documentation
    The platform allows the creation of code-coupled documentation that links directly to specific code snippets, providing context and clarity to developers.
  • Collaboration Features
    Swimm includes collaboration features such as comments and shared documentation spaces, promoting team discussion and feedback around the documentation.

Possible disadvantages of Swimm

  • Learning Curve
    There may be a learning curve for teams new to Swimm, as adopting a new tool requires time and effort to understand and integrate into existing workflows.
  • Dependency on Platform
    Relying heavily on a third-party tool for documentation can create dependencies, which might be problematic if there are service outages or changes in the toolโ€™s pricing model.
  • Cost
    For large teams or enterprises, Swimm's pricing could become a significant cost factor, especially if there are budget constraints.
  • Potential Over-reliance
    Teams might become over-reliant on Swimmโ€™s automatic updates and integrations, potentially leading to complacency in managing and reviewing documentation quality manually.
  • Limited Flexibility
    Some users might find Swimm's documentation format restrictive, as it may not accommodate all types of documentation needs or preferred styles.

ForthWrite features and specs

  • Voice Matching
    Learns from your real sent mail, not templates
  • Auto-draft replies
    Replies waiting in Gmail before you open your inbox
  • Batch-drafting
    Draft replies for your entire inbox with one click
  • Works in browser
    Gmail, Outlook, and web browsers
  • BYOK support
    Claude, OpenAI, Grok, Mistral, and more
  • Prompt Lab
    Version control and A/B test your persona prompt
  • Free tier
    10 drafts per week, no credit card required

Analysis of ForthWrite

Overall verdict

  • I don't have verified information about a product called ForthWrite (forthwrite.ai). I cannot confirm its features, quality, or reputation, so I'm unable to provide an accurate assessment of whether it's good.

Why this product is good

  • No reliable data available on this specific product in my knowledge base
  • This may be a newer product, a niche tool, or possibly a fictional/hypothetical name
  • Providing details without verified information could result in inaccurate or fabricated claims

Recommended for

  • Unable to determine without verified product information
  • Consider checking the official website, user reviews on platforms like G2 or Trustpilot, and independent tech review sites for accurate details

Swimm videos

SWIM REVIEW: SONR - Hear your swim coach while swimming.

ForthWrite videos

No ForthWrite videos yet. You could help us improve this page by suggesting one.

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Category Popularity

0-100% (relative to Swimm and ForthWrite)
Developer Tools
100 100%
0% 0
Email
0 0%
100% 100
Productivity
100 100%
0% 0
Email Productivity
0 0%
100% 100

Questions & Answers

As answered by people managing Swimm and ForthWrite.

Which are the primary technologies used for building your product?

ForthWrite's answer:

Next.js, React, Supabase, Anthropic Claude, OpenAI, Stripe, Vercel, Chrome Extensions API

What makes your product unique?

ForthWrite's answer:

ForthWrite learns your writing style from your actual sent mail, not a generic prompt. Every draft sounds like you wrote it because it was trained on how you actually write. It also auto-drafts replies before you open your inbox, so your email is partially handled before your day starts.

Why should a person choose your product over its competitors?

ForthWrite's answer:

Most AI email tools give you a blank box and a "write for me" button. ForthWrite builds a voice profile from your sent history and gets more accurate with every draft you edit or send. Unlike ChatGPT or Gemini, it works natively inside Gmail and Outlook with no copy-paste. Unlike Lavender, it writes the draft, not just scores it.

How would you describe the primary audience of your product?

ForthWrite's answer:

Professionals who send high volumes of relationship-critical email and cannot afford to sound generic: lawyers, financial advisors, recruiters, account executives, consultants, and founders managing their own inbox.

What's the story behind your product?

ForthWrite's answer:

Built out of frustration with AI writing tools that produce text that sounds nothing like the person sending it, and as a way to handle large amounts of daily email. The core insight was that your sent mail is the best training data you already have, and no tool was using it.

User comments

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Reviews

These are some of the external sources and on-site user reviews we've used to compare Swimm and ForthWrite

Swimm Reviews

We have no reviews of Swimm yet.
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ForthWrite Reviews

  1. curtisboortz
    ยท Founder at ForthWrite ยท
    I built ForthWrite to fix generic AI email, and I still use it every day

    I built ForthWrite because I kept sending emails that sounded like they came from the same generic AI as everyone else. After launching it, I still use it for my own inbox every day, which is about the most honest endorsement I can give.

    The Chrome extension lives inside Gmail and Outlook on the web. Open a thread, hit Alt+Shift+D, and a draft comes back in your voice, not a template. The free tier is real: 10 drafts per week, no API key, no credit card. Voice matching is included on free, because that is the point.

    What keeps it useful compared to Gemini or a chat tab: it learns from what you actually send. Every edit you make before hitting send becomes a signal. Over time the drafts drift closer to how you really write, and the dashboard shows the improvement curve so you can see it happening.

    The web compose surface lets you draft from forthwrite.ai without installing anything, useful for people who want to try before committing to the extension.

    Standard adds recipient-aware and intent-aware drafting plus AI coaching. Pro adds auto-draft (replies waiting when you open Gmail), batch replies, and Prompt Lab for version-controlling your prompts. Teams adds a shared persona and seat-level analytics.

    ForthWrite is not for everyone. If you just need quick replies and tone does not matter, Gemini is free and already in your inbox. ForthWrite is for people where tone does matter: client communication, relationship-driven threads, external correspondence where sounding off costs something real.

    Disclosure: I am the founder and use it daily. Happy to answer questions in the comments.

    ๐Ÿ Competitors: Jace.ai, Fyxer, Mailmeteor
    ๐Ÿ‘ Pros:    Drafts land inside gmail and outlook; no copy-pasting from a chat window|Voice matching is on the free tier, not paywalled behind paid plans|No api key, no credit card to start; free tier runs on a server-side proxy|Learns from every edit you make before sending; drafts improve over time|Full keyboard flow: alt+shift+d to draft in any thread, no mouse required|Byok on paid plans, 9 providers supported, keys encrypted at rest|Web compose at forthwrite.ai works without installing the extension at all
    ๐Ÿ‘Ž Cons:    10 free drafts/week is enough to evaluate, not enough for a heavy inbox|Auto-draft, batch replies, and prompt lab all require the pro tier|Early-stage product; fewer third-party integrations than mature inbox tools|No mobile app: the extension and add-in are desktop-only (chrome on web, or the outlook desktop add-in)

Social recommendations and mentions

Based on our record, Swimm seems to be more popular. It has been mentiond 3 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

Swimm mentions (3)

  • Your senior engineer just gave notice. Most of what they knew was in the repos all along.
    The tools built for this are good at it. Swimm, Confluence, Notion, a decent internal wiki, an afternoon of recorded walkthroughs. The whole category exists to move the contents of a person's head into a form the organisation can read later, and for tacit knowledge that is the right move. There is a reason it so rarely happens, and it is not that teams do not care. It is that the person holding the knowledge does... - Source: dev.to / about 1 month ago
  • AI-Powered Documentation: The End of Outdated Docs (and Developer Headaches)
    Swimm AI is the tool you wish you had when you inherited that legacy codebase. Its AI tracks code updates and automatically suggests or applies doc changes, so your docs never get left behind (unlike that one deprecated endpoint). - Source: dev.to / 8 months ago
  • Ask HN: How do you organize your engineering wiki?
    [1] An exple for code documentation is https://swimm.io/. - Source: Hacker News / over 3 years ago

ForthWrite mentions (0)

We have not tracked any mentions of ForthWrite yet. Tracking of ForthWrite recommendations started around Jun 2026.

What are some alternatives?

When comparing Swimm and ForthWrite, you can also consider the following products

Mintlify Writer - The AI-powered documentation writer. It's documentation that just appears as you build

ReclaimAI - Helps users prioritize their work and personal calendars

Docusaurus - Easy to maintain open source documentation websites

Superhuman - Superhuman is an email management tool.

GitBook - Modern Publishing, Simply taking your books from ideas to finished, polished books.

Shortwave - Email smarter & faster with a reinvented experience for your Gmail