Software Alternatives, Accelerators & Startups

Paper.js VS ForthWrite

Compare Paper.js VS ForthWrite and see what are their differences

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Paper.js logo Paper.js

Open source vector graphics scripting framework that runs on top of the HTML5 Canvas.

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
Not present
  • 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.

Paper.js

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

Paper.js features and specs

  • Vector Graphics Support
    Paper.js excels in handling vector graphics, making it an excellent choice for creating and manipulating graphics with precision.
  • Scene Graph
    The library uses a scene graph, which facilitates hierarchical organization and management of graphical objects.
  • Rich API
    Paper.js offers a highly intuitive and rich API that simplifies tasks like working with paths, segments, and more.
  • Ease of Use
    With its clear documentation and straightforward syntax, Paper.js is beginner-friendly while remaining powerful for advanced users.
  • Cross-Platform
    Being JavaScript-based, Paper.js works across different platforms and browsers without requiring any additional plugins.
  • Interactive Graphics
    It allows for easy creation of interactive graphics, making it ideal for use in web applications needing dynamic graphic manipulation.
  • Built-In Animation Support
    Paper.js includes built-in support for animations, enabling smooth and complex animations with minimal effort.

Possible disadvantages of Paper.js

  • Performance
    Due to its high-level abstraction and ease of use, Paper.js may not perform as well as lower-level graphics libraries in performance-critical applications.
  • File Size
    Paper.js can be relatively large in terms of file size compared to some lightweight alternatives, which might affect load times.
  • Limited to Canvas
    Paper.js is limited to the HTML5 Canvas element, so it doesn't natively support other rendering contexts like SVG.
  • Animation Flexibility
    While it offers built-in animation support, the flexibility and feature set might not be as extensive as dedicated animation libraries.
  • Learning Curve for Complex Features
    Although it's beginner-friendly for simple tasks, mastering more complex aspects of Paper.js can have a steeper learning curve.
  • Community and Support
    Paper.js might not have as large a community or as extensive support as some other more widely-used JavaScript libraries such as D3.js or Three.js.

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 Paper.js

Overall verdict

  • Paper.js is a great choice for those looking to create vector graphics and animations on the web. Its ease of use, powerful features, and active community support make it a strong contender in the realm of graphics frameworks.

Why this product is good

  • Paper.js is a powerful open-source vector graphics scripting framework that runs on top of the HTML5 Canvas. It's widely appreciated for its simplicity and flexibility, making it easier for developers to create complex graphics and animations with its concise syntax and intelligent object model. Its extensive and well-documented API, along with a thriving community, also contributes to its appeal.

Recommended for

  • Developers who need to create intricate vector graphics and animations.
  • Artists and designers looking for a tool to bring their designs to the web.
  • Educators and students interested in learning about graphics programming.
  • Projects that require dynamic and interactive graphics.

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

Paper.js videos

Revision clouds in AutoCAD using Paper.js

ForthWrite videos

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

Add video

Category Popularity

0-100% (relative to Paper.js and ForthWrite)
Javascript UI Libraries
100 100%
0% 0
Writing Tools
0 0%
100% 100
Development
100 100%
0% 0
Email
0 0%
100% 100

Questions & Answers

As answered by people managing Paper.js 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 Paper.js and ForthWrite

Paper.js Reviews

20+ JavaScript libraries to draw your own diagrams (2022 edition)
Paper.js is an open source vector graphics scripting framework that runs on top of the HTML5 Canvas. It offers a clean Scene Graph / Document Object Model and a lot of powerful functionality to create and work with vector graphics and bezier curves, all neatly wrapped up in a well designed, consistent and clean programming interface. Itโ€™s based on (and largely compatible)...
8 Best Free and Open-Source Drawing Libraries in JavaScript
The Paper.js library is another free and open-source solution for people who want to draw using JavaScript. The library uses canvas to handle its drawing animations. However, its primary focus is vector-based drawings instead of raster images.

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, Paper.js seems to be more popular. It has been mentiond 11 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.

Paper.js mentions (11)

  • How Framer/Figma is built?
    I started with angular and paper.js: http://paperjs.org/. Source: about 3 years ago
  • Polygon JS libraries
    In a thread in the Processing forum, Boolean operations in polygons , user ErraticGenerator suggests using g.js or Paper.js. Source: about 3 years ago
  • Looking for a javascript library with good wrapping support
    It is likely that paper.js provides the functionality needed. I will probably investigate it at some point since it appears to be the more popular library Compare paper.js & bezier.js. Source: over 3 years ago
  • Animating an svg
    Just remember you can do some SVG displacement with Paper.JS. Source: almost 4 years ago
  • Diagnosing RangeError: Maximum call stack size exceeded in React KeyEscapeUtils
    Our webapp is written with React and Redux using the official react-redux bindings. Another primary library used in this web app is PaperJS. We recently transitioned this to being a Redux app, though it has used React for a while. Source: about 4 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 Paper.js and ForthWrite, you can also consider the following products

p5.js - JS library for creating graphic and interactive experiences

Superhuman - Superhuman is an email management tool.

Three.js - A JavaScript 3D library which makes WebGL simpler.

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.

Konva - Konva is 2d Canvas JavaScript framework for drawings shapes, animations, node nesting, layering, filtering, event handling, drag and drop and much more.

Lavender - Realtime coaching for sales emails.