Software Alternatives, Accelerators & Startups

MySigMail VS ForthWrite

Compare MySigMail VS ForthWrite and see what are their differences

MySigMail logo MySigMail

UI email signature generator on GitHub

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.
  • MySigMail Landing page
    Landing page //
    2023-09-16
  • 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.

MySigMail

Website
github.com
Pricing URL
-
$ Details
-
Platforms
-
Release Date
-

ForthWrite

$ Details
freemium $12 / 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

MySigMail features and specs

  • Open Source
    MySigMail is open source, which means you can freely access, modify, and distribute the code. This fosters collaboration and allows for community-driven improvements.
  • Customizable
    Being open source, MySigMail offers great flexibility in customization. You can tailor the email signatures to match your brand identity and specific needs.
  • Cost-Effective
    Since it is open source and free to use, MySigMail provides a cost-effective solution for generating email signatures without the need for recurring subscription fees or additional costs.
  • Community Support
    With a community of developers contributing to the project, users can benefit from shared knowledge, peer support, and regular updates.
  • Learn and Grow
    By exploring and understanding the source code, developers can enhance their own coding skills and apply these learnings to other projects.

Possible disadvantages of MySigMail

  • Self-Hosting Required
    Users need to host the application themselves, which may require some technical knowledge and infrastructure. This can be a drawback for non-technical users or those without access to server resources.
  • Limited Official Support
    As an open source project, official support may be limited compared to commercial products. Users might need to rely on community forums or documentation for help.
  • Maintenance Responsibility
    Users are responsible for maintaining the application, including updates and bug fixes. This can be time-consuming and require ongoing effort.
  • Compatibility Risks
    Open source projects sometimes face compatibility issues with other software or platforms, potentially requiring additional customization or workarounds.
  • Potential for Stagnation
    If the community interest wanes or key contributors cease their involvement, the project could become stagnant without receiving regular updates and improvements.

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 MySigMail

Overall verdict

  • Overall, MySigMail is a good choice for individuals and businesses looking to create and manage email signatures easily and professionally. It offers a balance of simplicity and functionality, making it accessible to a wide audience.

Why this product is good

  • MySigMail is a tool designed for creating email signatures. It provides a user-friendly interface and plenty of customization options, making it easy to generate professional-looking email signatures without needing extensive design skills. Additionally, being open-source on GitHub, it allows developers to contribute to or adapt the project to better suit their needs.

Recommended for

  • Individuals seeking to create personalized email signatures.
  • Small to medium-sized businesses needing consistent email branding.
  • Developers looking for an open-source email signature tool to customize or improve.

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

Category Popularity

0-100% (relative to MySigMail and ForthWrite)
Email Signatures
100 100%
0% 0
Email
74 74%
26% 26
Email Productivity
0 0%
100% 100
Other B2B Software
100 100%
0% 0

Questions & Answers

As answered by people managing MySigMail 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 MySigMail and ForthWrite

MySigMail Reviews

We have no reviews of MySigMail 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, MySigMail seems to be more popular. It has been mentiond 2 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.

MySigMail mentions (2)

  • MySigMail v2 โ€” Open-Source Email Signature Generator
    Check out the project on GitHub: https://github.com/antonreshetov/mysigmail. I hope MySigMail helps you craft signatures that look great and feel effortless. - Source: dev.to / 11 months ago
  • How to install a GitHub script on Synology
    I am new to Reddit, this Synology group and GitHub. And I am struggling to get this open source project to run on my NAS: https://github.com/antonreshetov/mysigmail. I tried downloading / extracting the zip in a web server folder. But the index.html doesn't show anything. What am I missing? Can someone help me with it or tell me where to find the correct information? Been googling for days but I don't get it. I... Source: over 4 years ago

ForthWrite mentions (0)

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

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