Software Alternatives, Accelerators & Startups

Filestack VS ForthWrite

Compare Filestack VS ForthWrite and see what are their differences

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Filestack logo Filestack

Simple file uploader and robust APIs for uploading, transforming, and delivering any file into your app. Filestack is a collection of tools and powerful APIs that make it simple to upload, transform, and deliver content.

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.
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  • Filestack
    Image date //
    2024-09-19

Filestack is a cloud-based file management platform that provides tools for uploading, transforming, and delivering files in web, mobile, and desktop applications.

Its features include a picker UI, which allows users to upload files from their local computers and various external sources, and the Transformation UI, which provides a range of options for modifying and processing uploaded files.

When integrating these features into their applications, Filestack's APIs give developers flexibility and control.

Filestack can help add file management functionality to an application. Still, it's essential to carefully consider the specific needs of your application and evaluate whether Filestack or other similar tools would be the best fit.

They are simple to implement and offer a lot of flexibility. We can also provide insights into how your users use the system and how that affects your business objectives for your business teams. Users can upload files from a variety of sources, including their local computers, using the uploads feature. Picker offers a user-friendly interface for selecting and uploading files, and it can be customized and configured to meet the needs of a specific application.

Tools for modifying and processing uploaded files are provided by our Transormations API. This can include operations like resizing, cropping, and rotating images. Furthermore, the delivery component includes tools for optimizing file delivery performance and responsiveness.

  • 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.

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

Filestack features and specs

  • CDN
  • File Converter
  • Machine Learning
  • Workflows
  • API-friendly
  • Video and Audio Processing
  • Supported SDKs
    6

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 Filestack

Overall verdict

  • Filestack is generally considered a good choice for businesses and developers in need of comprehensive file management solutions. Its ease of use, scalability, and rich feature set make it a strong contender in the file handling space.

Why this product is good

  • Filestack is known for its robust API and user-friendly interface, which simplify file uploading, processing, and delivery. It offers extensive integrations with various platforms and supports numerous file types and transformations, making it a versatile choice for developers and businesses. The platform's security features and reliable infrastructure are also highly praised, ensuring secure and efficient file management.

Recommended for

  • Developers who need a reliable file upload and processing service.
  • Businesses looking to integrate file handling capabilities without building from scratch.
  • Organizations that require secure and efficient file management tools.
  • Teams that need to support a wide variety of file types and transformations.

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

Filestack videos

Filestack Tutorial Series: Basic Filestack Setup

More videos:

  • Tutorial - Filestack Tutorial Series: Filestack Info
  • Tutorial - Filestack Tutorial Series: Dropbox Integration
  • Review - Filestack Review: My Honest Experience with This Cloud File Handling Tool
  • Review - Filestack Guest Series: How Filestack Transformed My Development Process: A Review by CodeWithMasood
  • Review - Filestack File Storage Honest Review - Watch Before Using

ForthWrite videos

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

Add video

Category Popularity

0-100% (relative to Filestack and ForthWrite)
Digital Asset Management
100 100%
0% 0
Email
0 0%
100% 100
File Sharing
100 100%
0% 0
Email Productivity
0 0%
100% 100

Questions & Answers

As answered by people managing Filestack 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 Filestack 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 Filestack and ForthWrite

Filestack Reviews

We have no reviews of Filestack 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, Filestack seems to be more popular. It has been mentiond 6 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.

Filestack mentions (6)

  • Generate Alt Text and Searchable Metadata from User Uploads with Filestackโ€™s Caption API
    This guide walks through how to implement image captioning using Filestackโ€™s file picker. You can try it yourself in the interactive demo below, then copy the code into your own project. - Source: dev.to / 8 months ago
  • Connect Any File Source to Your Upload Flow with Custom Source
    Youโ€™ve probably run into this situation before: your File Picker works fine with local uploads, Google Drive, and Dropbox, but your users need to pull files from somewhere else. Maybe itโ€™s your companyโ€™s internal DAM, a headless CMS, or a custom media library. - Source: dev.to / 8 months ago
  • The Art of Cleaning Files Before They Reach Your Server
    Building an application that accepts user content is a standard requirement today. Whether you are running a classroom management tool or a print-on-demand shop, you need to accept files. However, accepting a file in your file uploader is only half the battle. The real challenge lies in making sure that file is actually usable and safe before it enters your system. This is where we move beyond simple uploads and... - Source: dev.to / 8 months ago
  • Why You Should Offload Your Image Processing (And How) with Profile Pictures
    It always starts with a script. A quick Sharp resize here, a bucket upload there. Six months later, youโ€™re juggling corrupted HEIC files from iPhones, angry support tickets about cropped foreheads, and a stack of technical debt that makes your โ€œsimpleโ€ profile image file uploader feel like a mini-project of its own. Sound familiar? - Source: dev.to / 10 months ago
  • Make Your Filestack Uploader Look Good with Tailwind
    Your file uploader no longer has to be the one generic component that breaks your user experience. It can be as polished as the rest of your app. We handled the hard parts so you can get back to work. - Source: dev.to / 12 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 Filestack and ForthWrite, you can also consider the following products

Uploadcare - File uploading, media processing & content delivery for modern web apps

ReclaimAI - Helps users prioritize their work and personal calendars

Uppy - The next open source file uploader for web browsers

Superhuman - Superhuman is an email management tool.

Uploader Window - Easy File Uploader for your websites and apps

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