Software Alternatives, Accelerators & Startups

Intruder VS ForthWrite

Compare Intruder VS ForthWrite and see what are their differences

Note: These products don't have any matching categories. If you think this is a mistake, please edit the details of one of the products and suggest appropriate categories.

Intruder logo Intruder

Intruder is a security monitoring platform for internet-facing systems.

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
  • Intruder Landing page
    Landing page //
    2022-05-04
  • 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

Intruder features and specs

  • Automated Vulnerability Scanning
    Intruder offers comprehensive automated vulnerability scanning, helping organizations detect security issues across their infrastructure without requiring manual intervention.
  • Continuous Monitoring
    The platform provides continuous monitoring to ensure that new vulnerabilities are identified and addressed in real-time, enhancing the overall security posture of the organization.
  • User-Friendly Interface
    Intruder is known for its intuitive and easy-to-use interface, making it accessible for users with varying levels of technical expertise.
  • Integration Capabilities
    Intruder integrates well with popular tools and platforms such as Slack, Jira, and AWS, allowing for seamless workflow management and enhanced operational efficiency.
  • Comprehensive Reporting
    Intruder provides detailed and actionable reports that help security teams prioritize and address vulnerabilities effectively.
  • Regular Updates
    The platform is regularly updated with the latest threat intelligence, ensuring that it is capable of detecting the most recent vulnerabilities.

Possible disadvantages of Intruder

  • Cost
    While Intruder offers robust features, it can be expensive for small businesses or startups with limited budgets.
  • Dependence on Automation
    Relying heavily on automated tools may lead to missed context-specific vulnerabilities that could be identified through manual testing.
  • False Positives
    Like many security scanning tools, Intruder can sometimes generate false positives, which can be time-consuming to investigate and resolve.
  • Learning Curve
    Despite its user-friendly interface, there is still a learning curve for new users to fully leverage all features and capabilities of the platform.
  • Limited Manual Scan Options
    Intruder focuses primarily on automated scanning, which may limit the ability to perform detailed manual scans that are sometimes necessary for specific use cases.
  • Scalability Challenges
    For very large enterprises with extensive and highly complex infrastructures, the platform might face scalability challenges in covering every aspect comprehensively.

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 Intruder

Overall verdict

  • Intruder is generally regarded as a good solution for vulnerability management, especially for small to medium-sized businesses. It provides ease of use, reliability, and effectiveness in identifying potential security risks.

Why this product is good

  • Intruder (intruder.io) is considered a strong security tool because it offers a comprehensive vulnerability scanning platform designed to identify and help remediate network security weaknesses. Its automated scanning features, compatibility with cloud services, and detailed reporting make it a convenient choice for businesses looking to improve their security posture. Additionally, its ability to integrate with various development and deployment tools helps streamline processes for security teams.

Recommended for

    Intruder is recommended for businesses and organizations seeking an automated, efficient vulnerability scanning solution. It is particularly beneficial for those with limited internal cybersecurity resources or companies managing a variety of digital assets across multiple platforms, including on-premises and cloud environments.

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 Intruder and ForthWrite)
Cyber Security
100 100%
0% 0
Email
0 0%
100% 100
Security
100 100%
0% 0
Email Productivity
0 0%
100% 100

Questions & Answers

As answered by people managing Intruder 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 Intruder 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 Intruder and ForthWrite

Intruder Reviews

10 Best Burp Suite Alternatives For Windows In 2023
Intruder is an online web application scanner that scans your private and publicly accessible servers, endpoints, cloud servers, and websites to ferret out vulnerabilities. It can easily find weaknesses like misconfiguration, weak passwords, SQL injections, and XSS among many others.
Best Burp Suite Alternatives (Free and Paid) for 2023
Offering industry-leading security checks, continuous monitoring and an easy-to-use platform, this tool keeps businesses of all sizes safe from malware and hackers. By integrating Intruder with your cloud platforms, you can maintain perfect visibility of your system and synchronize target scans.
10 Best Tenable Nessus Alternatives For 2021 [Updated List]
Verdict: Intruder allows you to continuously monitor your entire IT network infrastructure in a bid to reduce your attack surface. It generates comprehensive technical reports and analysis with the help of a reliable threat intelligence database to instantly detect and suggest remedial actions to patch the vulnerability. It is excellent when it comes to compliance report...

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, Intruder seems to be more popular. It has been mentiond 5 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.

Intruder mentions (5)

  • You do not know, what you do not know.
    We utilize a tool called intruder.io. This is an automated pentest tool. This tool automatically integrates with your cloud environment and allows you to specify targets to check. You can set up checks to be weekly, monthly, or quarterly. It also allows for scans on emerging threats https://help.intruder.io/en/articles/2068984-emerging-threat-scans-explained. We have this running against our environment alongside... - Source: dev.to / almost 2 years ago
  • Ask HN: Who is hiring? (October 2022)
    Intruder (https://intruder.io) | Various Engineering roles | Full-Time | London | REMOTE optional (UK or nearby timezone required) Intruder is a SaaS platform that helps companies easily identify their cyber security weaknesses, and fix them, before they get hacked. We're a fast growing startup, over 2200 customers from around the world love our product. Tech stack: Ruby on Rails and Python/Django back-end apps.... - Source: Hacker News / almost 4 years ago
  • Someone is trying to break into my NAS at my office
    Use something like intruder.io to scan your external IP address and see if its available from the outside, and take action as necessary. Source: over 4 years ago
  • Boss wants vulnerability scans completed on Linux servers and WordPress websites.
    Well the good-(ish) news is that like I said, regardless of the platform, intruder.io if the website (wordpress) is available from the internet intruder will scan it and produce a good report of any vulnerabilities and recommendations to fix. If you need a better report of vulnerabilities (which includes missing patches and what not) you can install the Nessus agent on the hosts and it too will report back to... Source: about 5 years ago
  • Ask HN: Who is hiring? (April 2021)
    Intruder (https://intruder.io) | Mid + Senior Software Engineer | Full-Time | London | REMOTE optional (UK or nearby timezone required) Intruder is a SaaS platform that helps companies easily identify their cyber security weaknesses, and fix them, before they get hacked. We're a fast growing startup, over 1000 customers from around the world love our product. Tech stack: Ruby on Rails and Python/Django back-end... - Source: Hacker News / over 5 years ago

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 Intruder and ForthWrite, you can also consider the following products

Acunetix - Audit your website security and web applications for SQL injection, Cross site scripting and other...

ReclaimAI - Helps users prioritize their work and personal calendars

Nessus - Nessus Professional is a security platform designed for businesses who want to protect the security of themselves, their clients, and their customers.

Superhuman - Superhuman is an email management tool.

HackerOne - HackerOne provides a platform designed to streamline vulnerability coordination and bug bounty program by enlisting hackers.

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