Software Alternatives, Accelerators & Startups

Guerrilla Mail VS ForthWrite

Compare Guerrilla Mail VS ForthWrite and see what are their differences

Guerrilla Mail logo Guerrilla Mail

Guerrilla Mail is a web-based app that provides a disposable and anonymous email address. Users of the service are not required to set up an account in order to send or receive emails.

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
  • Guerrilla Mail Landing page
    Landing page //
    2021-09-15
  • 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.

Guerrilla Mail

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

Guerrilla Mail features and specs

  • Anonymity
    Guerrilla Mail allows users to send and receive emails without revealing their real identity. This is beneficial for privacy-focused individuals who do not want their personal information exposed.
  • Temporary Email
    The service provides temporary email addresses that automatically expire, which helps to reduce spam and prevent unwanted emails in your primary inbox.
  • No Registration Required
    Users do not need to sign up or provide any personal information to use the service, making it quick and easy to use.
  • Spam Filter
    Guerrilla Mail has a spam filter that helps in controlling unsolicited emails, enhancing the user's experience.
  • Attachment Support
    Users can send attachments with their emails, which adds versatility to the service for various needs.

Possible disadvantages of Guerrilla Mail

  • Limited Duration
    Emails and email addresses only last for a short period (60 minutes), which can be inconvenient for long-term needs.
  • Basic Interface
    The user interface is quite simple and might not offer the advanced features that other email services provide.
  • Not Secure
    As a temporary email service, it lacks robust security features, making it unsuitable for sending sensitive information.
  • Deliverability Issues
    Emails sent via Guerrilla Mail may sometimes be recognized as spam by recipients' email providers, which can lead to deliverability issues.
  • Public Access
    Someone who knows the email address you are using can access your received emails since the service is publicly accessible, which could pose a privacy risk.

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

Guerrilla Mail videos

Can guerrilla mail be traced?

More videos:

  • Review - Saca provecho de un correo temporal con Guerrilla Mail

ForthWrite videos

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

Add video

Category Popularity

0-100% (relative to Guerrilla Mail and ForthWrite)
Disposable Email
100 100%
0% 0
Writing Tools
0 0%
100% 100
Fake Email
100 100%
0% 0
Email
97 97%
3% 3

Questions & Answers

As answered by people managing Guerrilla Mail 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 Guerrilla Mail and ForthWrite. For example, how are they different and which one is better?
Log in or Post with

Reviews

These are some of the external sources and on-site user reviews we've used to compare Guerrilla Mail and ForthWrite

Guerrilla Mail Reviews

15 Alternatives to Mailinator
Guerrilla Mail is one of the best known disposable email providers around. It uses a session address that lasts as long as you keep that session open. Any emails received will automatically be deleted after an hour, though. To reduce the chances of blacklisting, there are currently eleven domains to choose from, including the awesome @sharklasers.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, Guerrilla Mail 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.

Guerrilla Mail mentions (5)

  • Recommended alternative to guerrillamail.com?
    I've occasionally used guerrillamail.com to create a free throwaway email account when registering for other sites. Source: about 4 years ago
  • Anyone here use guerrillamail.com at all?
    But just the last couple of days guerrillamail.com seems to be down. Does this happen more often? Any alternatives you'd suggest? Source: about 4 years ago
  • Should I be using a VPN when downloading files? Also what kind of โ€œiffyโ€ stuff should I be avoiding. New to the community, thanks
    Some services block the guerrillamail.com emails and the sharklaser ones. I use these to sign up for spotify and other platforms that dont need my info. Source: about 4 years ago
  • A typical elven caravan. This drawing is inspired by the amazing pixel art on the trading page of the wiki. I have been meaning to draw it for years. Full credit to whoever made the pixel art! I recorded the process drawing this, I'll link it in the comments below :)
    Go to guerrillamail.com and make 100 more accounts :P. Source: about 5 years ago
  • Tickets are available for free on Eventbrite... be a real shame if a bunch of lefties ordered all the tickets, so she winds up speaking in an empty auditorium.
    You do need to verify the emails, unfortunately. You can use guerrillamail.com or 10minutemail.org with a private tab or tor. Source: 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 Guerrilla Mail and ForthWrite, you can also consider the following products

Mailinator - Any Inbox. Any Time.

Superhuman - Superhuman is an email management tool.

MailDrop - maildrop is a Mail delivery agent used by the Courier Mail Server. The maildrop MDA also includes filtering functionality. maildrop receives mail via stdin and delivers in both Maildir and mbox formats.

Gemini - Gemini, formerly known as Bard, is a generative artificial intelligence chatbot developed by Google. Based on the large language model (LLM) of the same name, it was launched in 2023 in response to the rise of OpenAI's ChatGPT.

10 Minute Mail - Temporary disposable e-mail service to beat spam. Avoid spam with a free secure e-mail address.

Lavender - Realtime coaching for sales emails.