Software Alternatives, Accelerators & Startups

GMass VS ForthWrite

Compare GMass VS ForthWrite and see what are their differences

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GMass logo GMass

GMass allows you to easily schedule emails, send out mass emails and mail merge campaigns and more with Gmail! Click here to learn about more features!

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
  • GMass Landing page
    Landing page //
    2023-05-11
  • 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.

GMass

Website
gmass.co
$ Details
-
Platforms
-
Release Date
-
Startup details
Country
United States

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

GMass features and specs

  • Ease of Use
    GMass is designed with a user-friendly interface, which makes it accessible even to those with limited technical skills. The integration with Gmail allows users to leverage the platform via their familiar email environment.
  • Email Personalization
    With GMass, users can personalize mass emails with individual names and other custom fields, increasing engagement and response rates.
  • Advanced Analytics
    GMass provides detailed analytics and reporting. Users can track open rates, click rates, and bounce rates, providing valuable insights into campaign performance.
  • Automation Features
    The tool offers robust automation capabilities, such as automated follow-ups and scheduled email campaigns, which save time and increase efficiency.
  • Affordability
    GMass is relatively affordable compared to other email marketing tools, offering good value for small businesses and individuals.

Possible disadvantages of GMass

  • Gmail Dependency
    GMass exclusively works with Gmail. This limits its usability for businesses or individuals who prefer other email platforms or require multichannel marketing solutions.
  • Limitations on Email Volume
    There are daily sending limits due to Gmail's sending limits. Users with large email lists might find this restrictive.
  • Potential for Spam Classification
    Sending large numbers of emails through GMass increases the risk of being marked as spam, especially if best practices for email marketing aren't strictly followed.
  • Limited Customer Support
    While GMass provides support, it may not be as comprehensive or readily available as some other premium email marketing tools, potentially leading to delays in resolving issues.
  • Learning Curve for Advanced Features
    While basic functionalities are easy to use, there is a learning curve associated with mastering more advanced features and settings, which might deter some users.

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 GMass

Overall verdict

  • GMass is generally considered to be a good tool for email marketing, especially for those who want a simple, effective solution that doesn't require managing a separate platform outside of Gmail. However, users looking for more advanced analytics or integration with non-Google services might find its capabilities limited compared to dedicated email marketing platforms.

Why this product is good

  • GMass is a popular email marketing tool integrated with Gmail that is particularly known for its ease of use, powerful features, and seamless integration with the Google ecosystem. It allows users to send mass emails, schedule campaigns, and track engagement directly from their Gmail account. Its features, such as automatic follow-ups, mail merge, and email personalization, make it appealing for both small and medium-sized businesses looking to streamline their email outreach efforts without the need for a separate marketing platform.

Recommended for

    GMass is recommended for individuals, small businesses, and startups who primarily use Gmail and are looking for a straightforward, cost-effective way to manage email campaigns. It is excellent for those who need to send personalized emails, automate follow-ups, and track basic metrics without extensive setup or learning curves.

GMass videos

GMass Review and Tutorial: How To Send Thousands of Emails in Minutes

More videos:

  • Tutorial - Gmass Review and Tutorial 2020
  • Tutorial - GMass Review - How to Send Bulk Email With Gmail

ForthWrite videos

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

Add video

Category Popularity

0-100% (relative to GMass and ForthWrite)
Email Marketing
100 100%
0% 0
Writing Tools
0 0%
100% 100
Email Marketing Platforms
Email
91 91%
9% 9

Questions & Answers

As answered by people managing GMass 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

Share your experience with using GMass and ForthWrite. For example, how are they different and which one is better?
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Reviews

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

GMass Reviews

BuzzStream for Outreach Campaigns: 2025 Review
GMass is a mail merge tool designed for mass email campaigns directly from your Gmail inbox. With advanced features like automated follow-ups, segmentation, and A/B testing, GMass enables users to manage and optimize email outreach efficiently.
Source: woodpecker.co
The 24 Best Email Marketing Tools
Gmass is a powerful mail merge and follow-up email service for Gmail. Connect to Google Sheets to send personalized mass emails; send emails to selected recipients as new messages or replies; schedule emails, track opens and clicks, manage unsubscribes, and send automated follow up messages.
Source: webbiquity.com
23 Best Cold Email WarmUp Tools in 2022 (Free + Paid)
GMass is an email marketing warm up software based around Googleโ€™s Gmail services.itโ€™s an Open source email warmup, where you can enjoy all exciting and useful tools for free.GMass is an all-in-one Gmail solution, which means it wonโ€™t work or be less effective with other providers.All you to go to GMass official website, and signup then start your journey.
Source: inguide.in

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, GMass seems to be more popular. It has been mentiond 7 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.

GMass mentions (7)

  • Easiest way to automate e-mails? (Newbie question)
    If you have Gmail or Gsuite, try GMass - gmass.co. Cheap, easy, and uses your email address, so not spam filtering. Source: over 3 years ago
  • Doesnโ€™t seem worth it to switch from gmail if this happens
    I did some tests today at gmass.co using my [xxx@pm.me](mailto:xxx@pm.me) email address and any of the many @pm.me emails I use go directly to the Primary Inbox on the tests. Whenever I use one of my authorized domains, even sending it from within protonmail.com, it ends up in Spam. Source: over 3 years ago
  • "Closing" isn't in the subject line and "If you want my help launching..." wasn't in the body of the email. How did they do this?
    You can use gmass.co to achieve this with gmail You can use inboxpirates to check how it looks on different email clients. Source: almost 4 years ago
  • Calling all small businesses!
    To send emails you can use Gmass, I preffer GBeast because it allows to send from multiple Gmail and G-Suite accounts and supports proxies to avoid the Google hammer. Source: about 4 years ago
  • What are the best Gmail extensions you've ever used?
    On my end, vocal.email and gmass.co are extensions I use daily :). Source: over 4 years ago
View more

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 GMass and ForthWrite, you can also consider the following products

MailChimp - MailChimp is the best way to design, send, and share email newsletters.

Superhuman - Superhuman is an email management tool.

Constant Contact - Constant Contact offers email marketing, social media marketing, online survey, event marketing, digital storefronts, and local deals tools.

Gemini - Gemini, formerly known as Bard, is a generative artificial intelligence chatbot developed by Google. Based on the large language model (LLM) of the same name, it was launched in 2023 in response to the rise of OpenAI's ChatGPT.

Brevo - Innovative online Email Marketing solution to manage your contacts, create & send your newsletters and track your results. More than 80 000 clients. Best prices and attractive features.

Lavender - Realtime coaching for sales emails.