Software Alternatives, Accelerators & Startups

Hammerspoon VS ForthWrite

Compare Hammerspoon VS ForthWrite and see what are their differences

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Hammerspoon logo Hammerspoon

This is a tool for powerful automation of OS X.

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
  • Hammerspoon Landing page
    Landing page //
    2021-09-25
  • 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.

Hammerspoon

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

Hammerspoon features and specs

  • Highly Customizable
    Hammerspoon allows users to write Lua scripts to automate virtually any task on macOS, providing a high degree of customization to meet individual needs.
  • Extensive API
    With a rich set of APIs, Hammerspoon supports interaction with numerous macOS features and third-party applications, increasing its versatility.
  • Lightweight
    Hammerspoon is relatively lightweight compared to other automation tools, minimizing the impact on system resources.
  • Active Community
    The Hammerspoon community is active and provides a wealth of shared scripts and modules, as well as support for new users.
  • Open Source
    Being open-source, Hammerspoon allows users to inspect, modify, and contribute to its codebase, fostering a collaborative development environment.

Possible disadvantages of Hammerspoon

  • Steep Learning Curve
    The necessity to write Lua scripts can be a barrier for users who are not familiar with programming, making the tool less accessible to non-developers.
  • Limited Documentation
    While there is documentation available, some users find it insufficient for more complex tasks, which may require additional research and experimentation.
  • Minimal Graphical Interface
    Hammerspoon lacks a user-friendly graphical interface, which can make setup and configuration less intuitive for some users.
  • Potential Stability Issues
    Depending on the complexity and efficiency of the user-created scripts, Hammerspoon could potentially cause system instability or performance issues.
  • MacOS Only
    Hammerspoon is exclusive to macOS, which limits its usability to users within the Apple ecosystem.

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 Hammerspoon

Overall verdict

  • Overall, Hammerspoon is considered a good tool for those who are comfortable with scripting and want to leverage its capabilities for custom automation on macOS. It is well-regarded within the community for its robust features and active development.

Why this product is good

  • Hammerspoon is a powerful automation tool for macOS that allows users to script and control their environment with a combination of Lua scripting and Objective-C APIs. Its flexibility and extensibility make it a desirable option for power users who want to automate repetitive tasks, customize their workflow, or create complex scripts to enhance productivity. Users appreciate its ability to integrate with macOS and utilize system events, window management, and hardware control, which provides a high degree of customizability that is not easily achievable through other tools.

Recommended for

    Hammerspoon is recommended for tech-savvy users, developers, and anyone who is familiar with scripting and is looking to automate their macOS environment. It is particularly useful for individuals who enjoy tinkering with their setup and want to have fine-grained control over their system's behavior.

Hammerspoon videos

HammerSpoon Worflow Automation

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 Hammerspoon and ForthWrite)
Automation
100 100%
0% 0
Writing Tools
0 0%
100% 100
Tool
100 100%
0% 0
Email
0 0%
100% 100

Questions & Answers

As answered by people managing Hammerspoon 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 Hammerspoon and ForthWrite

Hammerspoon Reviews

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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, Hammerspoon seems to be more popular. It has been mentiond 4 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.

Hammerspoon mentions (4)

  • i3 Linux -> macOS
    Then, I can only suggest http://hammerspoon.org/ and then you can start implementing window movement using it https://www.hammerspoon.org/go/#winmoveintro. Source: about 3 years ago
  • 49 inch Ultra Wide Monitor going from PC to Mac mini
    MacOS doesn't do this natively, but you have options: - If you just want to move windows around with some degree of keyboard customization, go for Rectangle. - If you want more control, such as sizing a bunch of windows at the same time, use Slate. - If you can code and want really high degrees of customization, you won't go wrong with Hammerspoon. Source: almost 4 years ago
  • Handy utility applications for macOS
    Both of those can be replaced by the open-source Hammerspoon (actually a significant number of the things in this thread can, including BTT). Source: about 4 years ago
  • Keyboard Maestro alternatives?
    Depending on what you want from KM, Hammerspoon may be a good alternative. You can also look up on AlternativeTo for other options. 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.

What are some alternatives?

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

Puloverโ€™s Macro Creator - Puloverโ€™s Macro Creator is a Free Automation Tool and Script Generator.

Superhuman - Superhuman is an email management tool.

AutoKey - A Python 3 port of AutoKey, the desktop automation utility for Linux and X11.

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.

AutoHotkey - The ultimate automation scripting language for Windows.

Lavender - Realtime coaching for sales emails.