Software Alternatives, Accelerators & Startups

GPT4All VS ForthWrite

Compare GPT4All VS ForthWrite and see what are their differences

GPT4All logo GPT4All

A powerful assistant chatbot that you can run on your laptop

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
  • GPT4All Landing page
    Landing page //
    2023-10-04
  • 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.

GPT4All

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

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

GPT4All features and specs

  • Open Source
    GPT4All is open source, allowing developers to freely access, modify, and distribute the code to suit their needs, which fosters innovation and transparency.
  • Community Support
    Being part of an open-source ecosystem, GPT4All benefits from community-driven support, where a large number of developers can contribute to its improvement, report issues, and provide solutions.
  • Flexibility
    Developers can customize GPT4All for various applications, making it versatile for different use cases beyond what might be supported by closed-source models.
  • Cost Effective
    Utilizing an open-source model can significantly reduce costs for businesses as they do not have to pay for licensing fees that are typically associated with proprietary solutions.

Possible disadvantages of GPT4All

  • Resource Intensive
    Running language models like GPT-4 can be computationally expensive, requiring significant hardware and electricity, making it challenging for developers with limited resources.
  • Lack of Official Support
    While the community can provide support, there is no official customer support available, which might be a drawback for organizations needing reliable assistance.
  • Complexity
    Implementing and managing an AI model like GPT4All can be complex and may require specialized knowledge in AI and machine learning, posing a barrier to entry for novices.
  • Security Concerns
    Open-source projects can sometimes have vulnerabilities if not properly managed, which might pose security risks if sensitive data is processed without adequate precautions.
  • Performance Variability
    The performance of open-source models may not match that of proprietary versions fully optimized by their developers, possibly resulting in less efficiency or accuracy in certain tasks.

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 GPT4All

Overall verdict

  • Overall, GPT4All is regarded as a good option for those seeking more autonomy and customization in their use of language models. It is particularly beneficial for developers and researchers who need to run experiments without the constraints of cloud dependencies.

Why this product is good

  • GPT4All is considered to be a valuable tool because it offers an open-source alternative for running language models locally. This provides users with more control over the model and data privacy, as the computations can be done on personal machines without requiring cloud services. Additionally, its accessible nature encourages innovation and adaptation within communities that may not have the resources to access proprietary AI solutions.

Recommended for

  • Developers interested in experimenting with AI locally
  • Researchers focusing on language models and AI innovation
  • Privacy-conscious users who prefer open-source solutions
  • Educational institutions looking to integrate AI in curricula

GPT4All videos

NEW GPT4All "Snoozy" - Don't Sleep On The Best Local LLM

More videos:

  • Review - Is GPT4All your new personal ChatGPT?
  • Review - HUGE GPT4ALL Upgrade, CPU, Commercial License, 1-Click Install, New UI, New Base Model

ForthWrite videos

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

Add video

Category Popularity

0-100% (relative to GPT4All and ForthWrite)
AI
96 96%
4% 4
Writing Tools
94 94%
6% 6
Productivity
100 100%
0% 0
Email
0 0%
100% 100

Questions & Answers

As answered by people managing GPT4All 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 GPT4All and ForthWrite

GPT4All Reviews

We have no reviews of GPT4All 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, GPT4All seems to be more popular. It has been mentiond 59 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.

GPT4All mentions (59)

  • AI: Introduction to Ollama for local LLM launch
    GPT4All: also a solution with UI, simple, has fewer features than ollama/llama.cpp. - Source: dev.to / about 1 year ago
  • Running Ollama on Docker: A Quick Guide
    Hi it's me again! Over the past few days, I've been testing multiples ways to work with LLMs locally, and so far, Ollama was the best tool (ignoring UI and other QoL aspects) for setting up a fast environment to test code and features. I've tried GPT4ALL and other tools before, but they seem overly bloated when the goal is simply to set up a running model to connect with a LangChain API (on Windows with WSL). - Source: dev.to / over 1 year ago
  • Top 8 OpenSource Tools for AI Startups
    Generative AI is hot, and ChatGPT4all is an exciting open-source option. It allows you to run your own language model without needing proprietary APIs, enabling a private and customizable experience. - Source: dev.to / over 1 year ago
  • The 6 Best LLM Tools To Run Models Locally
    GPT4ALL is built upon privacy, security, and no internet-required principles. Users can install it on Mac, Windows, and Ubuntu. Compared to Jan or LM Studio, GPT4ALL has more monthly downloads, GitHub Stars, and active users. - Source: dev.to / almost 2 years ago
  • Show HN: Site2pdf
    Thanks for taking the time to respond. I was thinking of something local, especially in light of: Google's Gemini AI caught scanning Google Drive PDF files without permission https://news.ycombinator.com/item?id=40965892 [2] https://github.com/Mintplex-Labs/anything-llm [4] https://recurse.chat/blog/posts/local-docs [5] - Source: Hacker News / almost 2 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 GPT4All and ForthWrite, you can also consider the following products

ChatGPT - ChatGPT is a powerful, open-source language model.

Superhuman - Superhuman is an email management tool.

HuggingChat - Open source alternative to ChatGPT. Making the best open source AI chat models available to everyone.

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.

Jan.ai - Run LLMs like Mistral or Llama2 locally and offline on your computer, or connect to remote AI APIs like OpenAIโ€™s GPT-4 or Groq.

Lavender - Realtime coaching for sales emails.