Software Alternatives, Accelerators & Startups

Sanity.io VS ForthWrite

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

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Sanity.io logo Sanity.io

Sanity.io a platform for structured content that comes with an open-source editor that you can customize with React.js.

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
  • Sanity.io Landing page
    Landing page //
    2023-08-23

Sanity treats your content as structured data and makes it available through a simple and powerful API. Content can be created and edited in our collaborative editor, called the Sanity Studio, which is a fully customizable, client-side web application. You can run the studio on your laptop, host it with us on Sanity.io, or deploy it on your own web server.

  • 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.

Sanity.io

Website
sanity.io
$ Details
freemium
Platforms
JavaScript Cross Platform PHP REST API GraphQL API GROQ Generic HTTP API Go
Release Date
2017 November
Startup details
Country
United States
State
California
Founder(s)
Even Westvang
Employees
10 - 19

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

Sanity.io features and specs

  • Real-time Collaboration
    Sanity.io supports real-time collaboration, allowing multiple users to work on the same content simultaneously without conflict, which is ideal for teams.
  • Customizable Content Models
    It offers high flexibility with its schema definitions, enabling users to create complex content structures tailored to specific needs.
  • Headless CMS
    As a headless CMS, Sanity.io decouples the backend from the frontend, allowing developers to use any framework or technology stack to present content.
  • Live Preview
    Sanity.io provides a live preview feature, enabling content editors to see changes in real-time before publishing them.
  • Scalable Infrastructure
    Powered by a scalable and performant backend, it can handle high traffic and large amounts of content, suitable for enterprises.
  • Extensible with Plugins
    The platform supports plugins, which means you can extend its capabilities with community or custom-built plugins.

Possible disadvantages of Sanity.io

  • Learning Curve
    Due to its flexible and powerful schema configuration, new users may find it challenging to get started without proper documentation or guidance.
  • Cost
    While it offers a free tier, the costs can escalate for larger projects or enterprises requiring more sophisticated features and higher limits.
  • Complex Setup
    The initial setup can be complex, especially for non-technical users, as it involves configuring schemas, setting up the development environment, and understanding APIs.
  • Limited Out-of-the-box Features
    Compared to some traditional CMS platforms, Sanity.io offers fewer out-of-the-box features which may require additional customization or development effort.
  • Dependency on Internet Connection
    Being an entirely cloud-based solution, it requires a stable internet connection for content management, which could be a limitation in areas with poor connectivity.

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 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

Sanity.io videos

Build a Portfolio Site with Sanity.io and Gatsby โ€” Learn With Jason

More videos:

  • Tutorial - How to deploy a transcription microservice for Sanity.io on Zeitโ€™s now

ForthWrite videos

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

Add video

Category Popularity

0-100% (relative to Sanity.io and ForthWrite)
CMS
100 100%
0% 0
Email
0 0%
100% 100
Blogging
100 100%
0% 0
Email Productivity
0 0%
100% 100

Questions & Answers

As answered by people managing Sanity.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

Share your experience with using Sanity.io 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 Sanity.io and ForthWrite

Sanity.io Reviews

21 Headless CMS Platforms That You Should Check Out
We have listed 21 headless CMS platforms with their pros and cons. However, it can be said that Strapi, Ghost, Sanity, Graph CMS are among the best headless CMS platforms that you can consider using. These platforms have higher G2 ratings and are easy to use.
Source: popupsmart.com
Best Headless CMS in 2022
Sanity is one of the best headless CMS on the market, which proves by using it such companies as Nike, Figma, National Geographic, and others. Sanity is very flexible in terms of development.
Source: flatlogic.com
Best Node.js CMS platforms for 2022
Sanity can be used for much more than conventional web experiences. Sanity finds its applications in everything from portfolio and company websites to ecommerce applications.
34 Headless CMS That Should Be On Your Radar
Launched in 2015, Sanity is an open source headless CMS that was developed in Oslo, Norway. Built on JavaScript and React.js, Sanity features a WYSIWYG rich text editor which allows you to embed editable data in running text and defer markup to render time. It also comes with a Sweet Query API that enables you to cache multiple queries on a single request.
Source: www.cmswire.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, Sanity.io seems to be more popular. It has been mentiond 56 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.

Sanity.io mentions (56)

  • Build a Modern Blog with Next.js 14 & Sanity: A Step-by-Step Guide
    A blog without a CMS can lead to endless frustration and wasted time. Sanity.io simplifies the entire process, allowing you to focus on your content. - Source: dev.to / almost 2 years ago
  • A Deep Dive into Sanity's Visual Editing and Presentation Tool: The developer view
    Hey there! Our colleagues over at Sanity.io, who are always at the forefront of structured content, have just rolled out two super cool features: Visual Editing and the Presentation tool. They unveiled these at their online shindig on November 17th, 2023, and let me tell you, it's got developers all over the world talking! - Source: dev.to / over 2 years ago
  • Odd server-client side issue (fetch and data transfer to client)
    I am fetching data from sanity.io (an array), the load function in my +page.ts file looks like this:. Source: over 2 years ago
  • Lets code together - Looking for coding buddies
    Tools Im comfortable with: next, tailwinds, zustand/zod/redux, shadcn, sanity.io, framer motion, typescript & more. Source: almost 3 years ago
  • How to add user auth with Clerk to Nextjs (App Directory) and store it in Embedded Sanity CMS
    Go to sanity.io sign up for an account. Sanity gives instructions on how to create the studio however since we are embedding the studio on a Nextjs project we can just ignore them and navigate to https://www.[sanity.io/manage](http://sanity.io/manage). If Sanity created a project for you click on it and copy the project ID, if they didnโ€™t you can click on Create a new project on the top and then copy the project... - Source: dev.to / almost 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 Sanity.io and ForthWrite, you can also consider the following products

Strapi - Manage any content. Anywhere. The leading open-source headless CMS. 100% JavaScript / TypeScript and fully customizable.

ReclaimAI - Helps users prioritize their work and personal calendars

Contentful - You don't need another CMS. You need a better way to manage content โ€” unified, structured, and ready to deploy to any digital channel.

Superhuman - Superhuman is an email management tool.

WordPress - WordPress is web software you can use to create a beautiful website or blog. We like to say that WordPress is both free and priceless at the same time.

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