Software Alternatives, Accelerators & Startups

Slither.io VS ForthWrite

Compare Slither.io VS ForthWrite and see what are their differences

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Slither.io logo Slither.io

Slither.io is a multiplayer online video game. Players control an avatar resembling a worm, which consumes multicolored pellets, both from other players and ones that naturally spawn on the map in the game, to grow in size.

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.
  • Slither.io Landing page
    Landing page //
    2018-09-29
  • 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.

Slither.io

Website
slither.io
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

Slither.io features and specs

  • Simple and Engaging Gameplay
    Slither.io combines the simple mechanics of classic snake games with a multiplayer twist, making it easy for new players to pick up and play while being challenging enough for experienced players.
  • Multiplayer Experience
    Playing with and against real players from around the world adds an element of unpredictability and competitiveness that enhances the overall experience.
  • No Download Required
    The game can be played directly in the web browser without the need for downloading and installing additional software or apps.
  • Aesthetic Appeal
    The colorful graphics and smooth animations make the game visually appealing and engaging.

Possible disadvantages of Slither.io

  • Lag and Performance Issues
    Players may occasionally experience lag, which can lead to frustrating moments, particularly in a competitive multiplayer environment.
  • Limited Game Mechanics
    The gameโ€™s mechanics are relatively simple and may become repetitive over time, lacking the depth and variety found in other games.
  • Advertisements
    The free-to-play model relies on advertisements, which can interrupt gameplay and detract from the gaming experience.
  • Connectivity Requirements
    A stable internet connection is required to play, which can be a limitation for players with poor or unstable internet access.

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 Slither.io

Overall verdict

  • Overall, Slither.io is a fun and engaging game that is well-suited for quick gaming sessions. Its simplicity and competitive nature make it appealing, although some players might find the gameplay repetitive over time. Lag issues can occasionally affect the experience, but updates have improved this aspect.

Why this product is good

  • Slither.io is popular due to its simple yet addictive gameplay. It combines elements of classic snake games with a competitive edge, allowing players to compete against others from around the world in real-time. The goal of growing and outmaneuvering opponents creates a dynamic and engaging experience. Additionally, its easy accessibility via web browsers and mobile devices contributes to its appeal.

Recommended for

    Slither.io is recommended for players who enjoy casual, competitive online games with straightforward mechanics. It's ideal for individuals looking for a quick gaming fix or those who have fond memories of classic snake games and wish to experience an updated version. It's also suitable for all ages, appealing to both younger audiences and adults due to its simplistic design and easy-to-learn controls.

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

Slither.io videos

SLITHER.IO | AppSpy Review

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 Slither.io and ForthWrite)
Games
100 100%
0% 0
Email
0 0%
100% 100
Online Games
100 100%
0% 0
Email Productivity
0 0%
100% 100

Questions & Answers

As answered by people managing Slither.io 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 Slither.io and ForthWrite

Slither.io 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, Slither.io seems to be more popular. It has been mentiond 311 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.

Slither.io mentions (311)

  • What is your favourite game to play while you're getting CC'd for 5 minutes straight?
    I was thinking slither.io, but it's not working well for me right now. Any suggestion? Source: about 3 years ago
  • There's really nothing like being up at 3 AM when everyones asleep playing stupid browser games while listening to music on your Chromebook.
    Games had to resort to to tolerate it . richup.io and slither.io last night. Source: about 3 years ago
  • Accidentally said something racist
    I was in a call with my friends one time and was playing slither.io. A user called Knee_grow killed my worm and I accidentally blurted out that I hated them. I felt so bad after. Am I racist? Source: about 3 years ago
  • Move your mouse pointer with hand gestures
    There is a game called slither.io (Link) I enjoy playing. Itโ€™s kinda hard playing from my phone (curse my small hands and the huge phone) and playing it using the built-in touchpad of my laptop is not something comfortable either. This is how the idea of a virtual mouse came to my mind. - Source: dev.to / about 3 years ago
  • I've made a 2D multiplayer bullet heaven/hell inspired by Snake and Magicka. This is my first trailer, please destroy the trailer and the game!
    I'd say if anything the trailer doesn't really get across that you have Magicka elements in it- if I had to make a guess pretending I'm fresh off the street- I'd say your game is like slither.io with shooting. Source: about 3 years ago
View more

ForthWrite mentions (0)

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

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