Software Alternatives, Accelerators & Startups

Slack VS ForthWrite

Compare Slack VS ForthWrite and see what are their differences

Note: These products don't have any matching categories. If you think this is a mistake, please edit the details of one of the products and suggest appropriate categories.

Slack logo Slack

A messaging app for teams who see through the Earth!

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
  • Slack Landing page
    Landing page //
    2023-07-18
  • 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.

Slack

Website
slack.com
$ 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

Slack features and specs

  • Real-Time Communication
    Slack allows for instant messaging and real-time communication, which facilitates quick decision-making and immediate problem solving among team members.
  • Channel Organization
    Users can create channels for different teams, projects, or topics, keeping discussions organized and easy to follow.
  • Integration Capabilities
    Slack integrates with a variety of other tools and services, such as Google Drive, Trello, and GitHub, allowing seamless workflow management.
  • Search Functionality
    Slackโ€™s powerful search feature makes it easy to find specific messages, files, or information within your team's communication history.
  • Custom Notifications
    Users can tailor their notification settings to minimize distractions while ensuring they stay informed about important discussions.
  • Cross-Platform Availability
    Slack is available on multiple platforms, including desktop, web, and mobile, ensuring that team members can stay connected from anywhere.

Possible disadvantages of Slack

  • Information Overload
    With constant streams of messages and notifications, Slack can sometimes lead to information overload, making it difficult for users to keep up.
  • Cost
    While Slack offers a free tier, many advanced features are only available in the paid plans, which can be costly for larger organizations.
  • Dependency on Internet
    Slack requires a stable internet connection, which can be a limitation for users in areas with unreliable or slow internet service.
  • Potential for Distraction
    The real-time nature of Slack can sometimes be distracting, pulling team members away from deep, focused work.
  • Privacy Concerns
    As with any digital communication tool, there are potential privacy and security concerns that organizations need to manage.
  • Scalability Issues
    Large teams or companies may find it challenging to manage and scale their usage of Slack effectively as the number of channels and conversations grows.

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

Slack videos

Review: How & Why We Use Slack At Our Office

More videos:

  • Review - What is Slack?
  • Tutorial - Slack App Tutorial: How & Why We Use SLACK For Our Remote Team

ForthWrite videos

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

Add video

Category Popularity

0-100% (relative to Slack and ForthWrite)
Communication
100 100%
0% 0
Writing Tools
0 0%
100% 100
Project Management
100 100%
0% 0
Email
0 0%
100% 100

Questions & Answers

As answered by people managing Slack 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 Slack 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 Slack and ForthWrite

Slack Reviews

  1. MeganMills
    A good chat messenger for teams

    i use it at my job it has really helped me keep myself updated with team news and updates. i would prefer it over teams and discord

    ๐Ÿ Competitors: Microsoft Teams, Discord
    ๐Ÿ‘ Pros:    Super simple
    ๐Ÿ‘Ž Cons:    Channel swithcing
  2. San93
    ยท Director at Polar credit ยท
    Essential for Team Collaboration but Needs Better Notification Management

    Slack has transformed how we communicate at Polar Credit, making collaboration faster and more organized. The channel-based messaging, direct integrations with essential tools, and real-time notifications keep our teams connected, reducing reliance on long email threads. The search function is a major plus, helping retrieve past conversations and shared files effortlessly.

    ๐Ÿ Competitors: Discord
    ๐Ÿ‘ Pros:    Organized team communication through channels and threads|Seamless integrations with apps like google drive, trello, and zoom
    ๐Ÿ‘Ž Cons:    Initial setup and implementation take time|Limited message history on the free plan
  3. EllaSvensson
    ยท Marketing Manager at Freelancer ยท
    A Must-Have for Teamwork

    Slack has completely transformed how our team works together. The channels keep conversations organized, and we never lose track of important discussions.

    It integrates with tools like Google Drive and Zoom, making collaboration effortless. Sharing files is easy, and the search feature saves so much time when finding old messages.

    Slack is simple, customizable, and keeps everyone connectedโ€”whether weโ€™re in the office or remote. Itโ€™s the perfect tool for teamwork!

    ๐Ÿ Competitors: Discord, Microsoft Teams

Top 12 Online Collaboration Tools for Smart Working
Slack is a cloud-based app built to simplify communication and teamwork. As one of the essential team collaboration tools, it enhances communication and productivity within teams. Itโ€™s packed with features that help teams stay connected, collaborate, and stay on top of things. A standout feature is the ability to create channelsโ€”dedicated spaces for conversations around...
Source: niftypm.com
7 best Mattermost alternatives for secure business messaging
Slack has a mobile and desktop app that supports remote teams to communicate seamlessly. On Slack, you can send files, documents, images, and videos. with your teammates.
Source: www.rocket.chat
20 Telegram Alternatives to Chat With in 2024
Slack works more like a forum than Teams does โ€“ falling somewhere in between a forum and a chat software. It lets you organize discussions into different channels, as well as by thread. You can invite others into a thread by @mentioning them, and it lets you add lots of different types of content. Slack works really well for 1:1 audio meetings, โ€œhuddles,โ€ that give you the...
Why we switched to Mattermost
Now, obviously core messaging functionality is critical.ร‚ Mattermost is great there, but so is Slack.ร‚ In fact, Slack features like third-party integrations and threaded messaging were missed greatly (thank you, Mattermost, for recently adding threaded messaging).ร‚ So the relative parity between the solutions from a โ€˜speeds and feedsโ€™ perspective was table stakes, but we...
Source: netfoundry.io
Microsoft Teams Vs Clariti: Which one should you choose?
The main reason behind the sudden rise of Teams is it is being offered at no added cost to Office 365 users. This strategy paid for Teams as it was able to increase its market share and overtake its potential rival Slack in no time. Though Microsoft is not earning any revenue (they may actually be losing money in selling Teams), they are able to sustain due to their deep...
Source: clariti.app

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, Slack seems to be more popular. It has been mentiond 237 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.

Slack mentions (237)

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 Slack and ForthWrite, you can also consider the following products

Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.

Superhuman - Superhuman is an email management tool.

Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.

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.

Telegram - Telegram is a messaging app with a focus on speed and security. Itโ€™s superfast, simple and free.

Lavender - Realtime coaching for sales emails.