Software Alternatives, Accelerators & Startups

Leaflet VS ForthWrite

Compare Leaflet VS ForthWrite and see what are their differences

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Leaflet logo Leaflet

Leaflet is a modern, lightweight open-source JavaScript library for mobile-friendly interactive maps.

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
  • Leaflet Landing page
    Landing page //
    2023-06-13
  • 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.

Leaflet

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

Leaflet features and specs

  • Lightweight
    Leaflet is designed to be easy on resources, making it fast to load and suitable for performance-critical applications.
  • Ease of Use
    The API is straightforward and well-documented, which makes it accessible for developers of all experience levels.
  • Open Source
    Being open-source means it is free to use and has a collaborative community contributing to its improvement.
  • Extensible
    Leaflet supports a wide range of plugins for additional functionality, allowing for customization and extension based on specific requirements.
  • Support for Mobile
    Leaflet is optimized for mobile browsers and touch devices, including multi-touch support.
  • Customizable
    It allows for extensive customization with a variety of map projections, tile layers, and interactive overlays.

Possible disadvantages of Leaflet

  • Limited Built-in Features
    Compared to some other mapping libraries, Leaflet has fewer built-in features out of the box.
  • Performance with Large Data Sets
    Rendering large data sets (such as many markers or complex geometries) can impact performance.
  • Steeper Learning Curve for Advanced Customization
    While basic use is straightforward, more advanced customizations can be challenging and may require deeper knowledge of JavaScript and Leaflet's architecture.
  • Limited 3D Support
    Leaflet is primarily designed for 2D maps, and doesn't natively support 3D visualizations, which may be a limitation for some applications.
  • Dependence on Third-party Services
    For certain functionalities like tile layers, geocoding, and routing, you may need to rely on third-party services, which can involve additional costs and dependencies.

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 Leaflet

Overall verdict

  • Yes, Leaflet is a solid choice for creating interactive maps on the web, especially when performance and simplicity are priorities.

Why this product is good

  • Leaflet is considered a good JavaScript library for interactive maps due to its simplicity, performance, and ease of use. It provides an intuitive API, is lightweight, and works across various devices and browsers. Developers appreciate its extensibility through plugins and its active community that continuously supports and improves the library.

Recommended for

  • Web developers looking for an easy-to-use mapping solution.
  • Projects requiring lightweight and fast interactive maps.
  • Applications where mobile responsiveness is important.
  • Developers who want to extend functionality using a wide range of plugins.

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

Leaflet videos

leaflet review

More videos:

  • Review - Labour Party Leaflet Review
  • Demo - Liberal Democrats Party Leaflet Review

ForthWrite videos

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

Add video

Category Popularity

0-100% (relative to Leaflet and ForthWrite)
Maps
100 100%
0% 0
Email
0 0%
100% 100
Javascript UI Libraries
100 100%
0% 0
Email Productivity
0 0%
100% 100

Questions & Answers

As answered by people managing Leaflet 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 Leaflet 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 Leaflet and ForthWrite

Leaflet Reviews

Top 15 Price Monitoring Tools For E-Commerce In 2022
Leaflet.js is the most popular open-source JavaScript library for providing mobile-friendly interactive maps. With a simple, easy-to-use interface, it is the perfect solution for all of your data management needs. It operates well right out of the box on all major platforms and devices. The platform offers the following services:
Source: adscale.com
Top 5 Open-Source Google Maps Alternatives in 2022
The Leaflet is another open source interactive maps software that comes with self-hosting capabilities. This map application is lightweight and easy to use. Above all, it is available for all desktop and mobile platforms such as Android, IOS, and web. Further, this offline maps app is highly extensible and offers a well-documented API for third-party integrations. This open...
The Best Data Visualization Tools - Top 30 BI Software
Leaflet leverages OpenStreetMap data and adds HTML5/CSS3 visualizations and interactivity on top to ensure everything is responsive and mobile ready. Its extensive plugin repository lets you add heatmaps , masks and animated markers. Leaflet is open source JavaScript library designed for creating interactive mobile-friendly maps and ships at only 33kb. This Javascript...
Source: improvado.io
Farewell, Google Maps
On a positive note we were impressed by the quality of open source code for operating maps (Leaflet). Some advanced functions which we had implement ourselves on Google side were readily available in Leaflet.
Survey of the Best Online Mapping Tools for Web Developers: The Roadmap to Roadmaps
It is safe to say that Leaflet was born as a reaction to OpenLayersรขย€ย™ bloat, clutter and complexity. Vladimir Agafonkin was asked to build a wrapper around OpenLayers, but he instead created a simple and lightweight OpenLayers alternative, and in May 2011 Leaflet was born. Vladimir focused on simplicity, performance and usability for this online map tool. The core library...
Source: www.toptal.com

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, Leaflet seems to be more popular. It has been mentiond 147 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.

Leaflet mentions (147)

  • Build a Live Flight Radar in a Single HTML File
    We'll use Leaflet.js for the map and a free aviation API for real-time ADS-B positions. The whole thing is under 100 lines of code, and the planes update every 30 seconds. - Source: dev.to / 2 months ago
  • Show HN: An interactive map of Tolkien's Middle-earth
    I added a comment above about the use of https://leafletjs.com/ if you are interested. - Source: Hacker News / 4 months ago
  • Show HN: An interactive map of Tolkien's Middle-earth
    PS: There have been a few questions about the tiling system used. It's based on https://leafletjs.com/ and you will find it all in the Github repo. Its one of the more interesting parts of the project: https://github.com/frasermarlow/middle-earth-map The tiles were pre-generated from the source image using generate_tiles.py โ€” a Python script that slices the big map into 256x256 JPEG tiles at three zoom levels .... - Source: Hacker News / 4 months ago
  • Metal Birds Watch: Copilot CLI Helped Me Watch Planes Without Looking Up
    Leaflet - For delivering lightweight and powerful interactive maps. - Source: dev.to / 6 months ago
  • Building an interactive map with Replit Agent: A software engineer tests vibe-coding efficiency
    The agent installed the packages and generated core components, including Leaflet, an open-source JavaScript library for interactive maps. Iโ€™m unfamiliar with the package so it wouldโ€™ve taken me a while to read the documentation and render it properly. - Source: dev.to / 8 months 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 Leaflet and ForthWrite, you can also consider the following products

jQuery - The Write Less, Do More, JavaScript Library.

ReclaimAI - Helps users prioritize their work and personal calendars

React Native - A framework for building native apps with React

Superhuman - Superhuman is an email management tool.

Babel - Babel is a compiler for writing next generation JavaScript.

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