Software Alternatives, Accelerators & Startups

Agar.io VS ForthWrite

Compare Agar.io 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.

Agar.io logo Agar.io

The smash hit game! Control your cell and eat other players to grow larger! Play with millions of players around the world and try to become the biggest cell of all!

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.
  • Agar.io Landing page
    Landing page //
    2023-06-21
  • 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.

Agar.io

Website
agar.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

Agar.io features and specs

  • Simple and Addictive Gameplay
    Agar.io's gameplay is easy to understand, making it accessible to players of all ages. The goal of growing your cell by consuming smaller cells while avoiding larger ones is intuitively addictive.
  • Multiplayer Experience
    The game offers a real-time multiplayer experience where you can compete and interact with players from around the world, adding a social and competitive aspect.
  • Free to Play
    Agar.io is free to play, which makes it easy for anyone to try without any financial commitment. Optional in-game purchases for skins and boosts are available but not mandatory.
  • Cross-Platform Availability
    The game is available on multiple platforms including web browsers and mobile devices, allowing for a wide audience reach and versatile play options.
  • Regular Updates
    The developers frequently update the game with new modes, skins, and features, helping to keep the gameplay fresh and engaging.

Possible disadvantages of Agar.io

  • High Competition and Frustration
    The highly competitive nature of the game can be frustrating for new and casual players, especially when competing against more skilled or larger players.
  • In-App Purchases
    While the game is free to play, there are in-app purchases that can give paying players an advantage, potentially creating an uneven playing field.
  • Lag and Performance Issues
    Agar.io can experience lag and performance issues, particularly during peak times or on less powerful devices, which can negatively impact the gaming experience.
  • Repetitive Gameplay
    The core gameplay loop of Agar.io can become repetitive over time, as it revolves around the same basic mechanics of eating cells and avoiding being eaten.
  • Toxic Community
    As with many online multiplayer games, the community can sometimes be toxic, with instances of unsportsmanlike behavior and chat harassment.

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 Agar.io

Overall verdict

  • Overall, Agar.io is a fun and engaging browser-based game that appeals to a broad audience. Its minimalist design and competitive nature make it a popular choice for both casual and dedicated gamers seeking a quick gaming session.

Why this product is good

  • Agar.io is considered good by many players due to its simple yet addictive gameplay mechanics. It's easy to pick up and play, allowing players to navigate a cell to consume smaller entities while avoiding being consumed by larger ones. The game also offers a competitive environment with leaderboards and multiplayer interaction, which adds to the replayability.

Recommended for

    Agar.io is recommended for players who enjoy fast-paced multiplayer games, competitive challenges, and straightforward gameplay. It's particularly suitable for gamers looking for an easy-to-access game without the need for extensive tutorials or long commitments.

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

Agar.io videos

Why Is Everybody Playing... Agario?? :: Agar.io Review

More videos:

  • Review - Playing AGAR.IO IN 2019! (*WORLD RECORD*)
  • Review - NanoRoyale Review - Cryptocurrency Battle Royale Agar.io Game?

ForthWrite videos

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

Add video

Category Popularity

0-100% (relative to Agar.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 Agar.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 Agar.io and ForthWrite

Agar.io Reviews

We have no reviews of Agar.io 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, Agar.io seems to be more popular. It has been mentiond 289 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.

Agar.io mentions (289)

  • [Web] [mid to late 2010s] Game from the agar.io era
    Hey, the game I am looking for was from when agar.io was popular. It was a singleplayer game where your cursor was a little dot. Bigger dots would fly into the screen from every side and you had to avoid them, as if you touched them with your small dot you would die. However, there were also some smaller dots coming that you could touch to get bigger. So you basically had to eat the smaller dots and avoid the... Source: almost 3 years ago
  • Multiplayer Help -- Hosting Multiple Games/Rooms
    Question: Is it possible to use the "High-Level Multiplayer API" to implement different "game rooms" from the same server? For example, in the case of agar.io, you can create different game rooms that can be joined by you're friends with a code. From what I can tell, when a client connects to the server using MultiplayerPeer, the server acts as another peer in the game, so I can't tell if it's possible to let that... Source: almost 3 years ago
  • .io Game Server Infrastructure
    So, my question is: What kind of servers do IO games like agar.io, diep.io or slither.io typically use? (I'm not talking about the ones who are faking multiplayer of course. Source: almost 3 years ago
  • how could we get teamers and hackers to play fair again?
    Its annoying that you as a normal player don't has a chance anymore. What can we do so agar.io will be as fun as back in the day when it was 2016 and there was no teaming? Source: about 3 years ago
  • help finding an io game
    I remember it being an agar.io style game, but you were blocks and might have become littler blocks when you died. I think the name started with a k, or one of the skins had the letter k in it. I remember playing it 2-3 years ago. 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.

What are some alternatives?

When comparing Agar.io and ForthWrite, you can also consider the following products

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.

ReclaimAI - Helps users prioritize their work and personal calendars

Diep.io - Diep.io is a multiplayer action game available for web browsers, Android, and iOS, created by Brazilian developer Matheus Valadares. Players control tanks and earn points by destroying shapes and killing other players in a 2D arena.

Superhuman - Superhuman is an email management tool.

Osmos - The full game includes 47 levels (plus "infinite" bonus content) across 8 distinct level...

Shortwave - Email smarter & faster with a reinvented experience for your Gmail