Software Alternatives, Accelerators & Startups

SpamAssassin VS ForthWrite

Compare SpamAssassin VS ForthWrite and see what are their differences

SpamAssassin logo SpamAssassin

Use this program to "Unspam" your mailbox(es).

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
  • SpamAssassin Landing page
    Landing page //
    2018-11-24
  • 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.

SpamAssassin

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

SpamAssassin features and specs

  • Open Source
    SpamAssassin is a free and open-source project under the Apache License, allowing users to modify and distribute the software freely.
  • Highly Customizable
    Users can tailor the filtering rules according to their specific needs, allowing for enhanced flexibility and effectiveness in spam detection.
  • Robust Community Support
    Being an open-source project with an active community, SpamAssassin benefits from continuous updates and a wealth of shared knowledge.
  • Effective Spam Detection
    SpamAssassin uses a wide range of heuristic and statistical analysis techniques to identify spam with high accuracy.
  • Support for Plugins
    The software supports various plugins, allowing users to extend its functionality and improve spam filtering capabilities.
  • Integration Capabilities
    SpamAssassin can be integrated with various mail servers and email clients, making it a versatile tool for different environments.

Possible disadvantages of SpamAssassin

  • Resource Intensive
    SpamAssassin can be resource-intensive, particularly for large-scale email servers, potentially impacting server performance.
  • Complex Configuration
    Setting up and configuring SpamAssassin requires a good understanding of the system and its rules, which can be daunting for inexperienced users.
  • False Positives
    Despite its effectiveness, SpamAssassin can sometimes misclassify legitimate emails as spam, leading to potential communication issues.
  • Manual Updates Needed
    Users need to manually update filtering rules and software, which can be cumbersome and requires regular attention.
  • Limited Immediate Support
    While there is a strong community, official support resources are limited, which can be a drawback for businesses needing immediate help.
  • Dependency on External Tools
    SpamAssassin may require integration with other software components or libraries, which adds to the complexity of deployment and maintenance.

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 SpamAssassin

Overall verdict

  • Yes, SpamAssassin is considered a good tool for filtering out spam. It is well-supported, consistently updated by an active community, and offers reliable performance with a high detection rate of unwanted emails.

Why this product is good

  • SpamAssassin is highly regarded for its robust, open-source spam-filtering capabilities, which rely on a wide array of techniques such as header and text analysis, Bayesian filtering, DNS blocklists, and collaborative filtering databases. Its flexibility allows users to customize rules and settings to meet their specific needs, making it a popular choice among individuals and businesses seeking effective spam protection.

Recommended for

  • System administrators seeking a flexible and customizable spam filtering solution for their servers.
  • Businesses looking for an open-source product to integrate with their current email systems.
  • Individuals who are highly technical and prefer an easily configurable and powerful spam filter.

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

SpamAssassin videos

spamassassin antispam - redhat

More videos:

  • Tutorial - How to enable and setup SpamAssassin in cPanel

ForthWrite videos

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

Add video

Category Popularity

0-100% (relative to SpamAssassin and ForthWrite)
Email Security
100 100%
0% 0
Email
79 79%
21% 21
Email Productivity
0 0%
100% 100
Cyber Security
100 100%
0% 0

Questions & Answers

As answered by people managing SpamAssassin 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 SpamAssassin and ForthWrite

SpamAssassin Reviews

We have no reviews of SpamAssassin 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, SpamAssassin seems to be more popular. It has been mentiond 7 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.

SpamAssassin mentions (7)

  • Swordphish: Visualizing Email Phishing Attacks with Postmark
    Apache SpamAssassin returns a spam score and performs tests to check if the email is likely spam. - Source: dev.to / about 1 year ago
  • Will Your Marketing Email End Up in Spam? We Built a Tool to Find Out
    Apache SpamAssassin is an open-source spam detection platform maintained by the Apache Software Foundation, which is a widely used tool for many email clients and email filtering tools to classify messages as spam. - Source: dev.to / over 1 year ago
  • Build an API to Keep Your Marketing Emails Out of Spam
    Apache SpamAssassin is a widely used tool for many email clients and email filtering tools to classify messages as spam. In this post, weโ€™ll explore how to leverage SpamAssassin to validate if your email will be marked as spam and why it's marked so. The logic will be packaged as an API and deployed online, so that it can be integrated into your workflow. - Source: dev.to / over 1 year ago
  • Ok, I've migrated email to selfhosted
    Spamassassin or rspamd or ASSP. All very good. Spamassassin just works, but you need to feed it a good cohort of spam and ham (about 1000 messages each). Most people only send it the spam which will then bias it quite a bit and not have it classify spam as spam unless it's the worst of the bunch. Spamassassin is a filter for your mail server. Rspamd is the same idea. ASSP is highly configurable and a proxy. Source: about 3 years ago
  • Using Flask for a personal website - add dynamic component?
    I'm currently looking into using a Bayesian spam filter like Bogofilter or Apache Spamassassin to help out. I'd run the contents of my Contact Us form through the filter after the initial validation, and if the contents are below my spam threshold, I would actually send out the contact us request. Source: almost 5 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?

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Broadcom Email Security - Anti-spam gateway blocks more than 99% of spam with less than one in 1 million false positives and...

Superhuman - Superhuman is an email management tool.

Oikik Antispam - Oikik is a cloud-based email filtering service that works with your existing email service.

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