Software Alternatives, Accelerators & Startups

BLOCK THIS! VS ForthWrite

Compare BLOCK THIS! VS ForthWrite and see what are their differences

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BLOCK THIS! logo BLOCK THIS!

Block This 3.0 is a FREE and Open Source ad blocker for Android that works in all apps and browsers!

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
  • BLOCK THIS! Landing page
    Landing page //
    2023-08-26
  • 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.

BLOCK THIS!

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

BLOCK THIS! features and specs

  • Ad Blocking
    BLOCK THIS! effectively blocks ads, providing a smoother and less cluttered browsing experience.
  • Privacy Protection
    The app helps protect user privacy by blocking trackers and other intrusive scripts, which can help keep your personal information secure.
  • Bandwidth Saving
    By blocking ads and trackers, BLOCK THIS! reduces the amount of data loaded on webpages, saving bandwidth and potentially speeding up browsing.
  • Battery Efficiency
    Blocking ads can lead to less resource consumption, potentially extending the battery life of mobile devices.
  • Free to Use
    The app is available for free, making it accessible to a wide range of users without the need for a subscription or purchase.

Possible disadvantages of BLOCK THIS!

  • Compatibility Issues
    BLOCK THIS! may not work smoothly on all devices or with all browsers, which might limit its usability for some users.
  • Potential Content Blocking
    Occasionally, the app may block legitimate content along with ads and trackers, which can disrupt the user experience on some websites.
  • Updates and Support
    The frequency and reliability of updates and ongoing support can be variable, potentially leading to performance issues or lack of new features over time.
  • Root Requirement for Android
    On some Android devices, full functionality may require root access, which is not recommended for all users due to security and warranty concerns.
  • Potential Ethical Concerns
    Blocking ads raises ethical questions regarding the support of content creators who rely on advertising revenue to provide free content.

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 BLOCK THIS!

Overall verdict

  • BLOCK THIS! is considered a good option for users seeking a lightweight and effective method to block ads and enhance privacy protection. Its DNS-based blocking can be less intrusive compared to other ad-blockers.

Why this product is good

  • BLOCK THIS! is a tool designed to block unwanted ads and protect user privacy while browsing the internet. It uses DNS blocking to stop ads before they even reach the browser, which can improve page load times and reduce data usage. Additionally, it may provide some protection against malicious sites.

Recommended for

  • Users looking to speed up web browsing by reducing ads and other unwanted content.
  • Privacy-conscious users who want to avoid tracking by advertisers.
  • Individuals seeking a DNS-based ad blocking solution that works on multiple devices.

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

Category Popularity

0-100% (relative to BLOCK THIS! and ForthWrite)
Security & Privacy
100 100%
0% 0
Email
0 0%
100% 100
Monitoring Tools
100 100%
0% 0
Email Productivity
0 0%
100% 100

Questions & Answers

As answered by people managing BLOCK THIS! 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 BLOCK THIS! and ForthWrite

BLOCK THIS! Reviews

We have no reviews of BLOCK THIS! 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, BLOCK THIS! seems to be more popular. It has been mentiond 22 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.

BLOCK THIS! mentions (22)

  • Blockada 5 alternative?
    Block This 3.1 VPN ad-blocker works just as well as adguard dns for older Android 8.0- OS. Very easy to use. Source: over 2 years ago
  • Nightmare on my kindle fire 8
    Try installing block-this on it and see if it helps. Https://block-this.com. Source: about 3 years ago
  • Are the โ€œJesusโ€ ads on this site getting more aggressive?
    For android devices block this is an app that can block nearly all mobile ads, both in apps and in browsers. Source: over 3 years ago
  • Appliance makers sad that 50% of customers wonโ€™t connect smart appliances
    I think https://block-this.com/ does what you propose. Source: over 3 years ago
  • Is possible to make a universal patch for no ads that work on every apk?
    Maybe check out the canonical page instead: https://block-this.com. Source: over 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.

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