Software Alternatives, Accelerators & Startups

checkra1n VS ForthWrite

Compare checkra1n VS ForthWrite and see what are their differences

checkra1n logo checkra1n

Jailbreak for iPhone 5s through iPhone X, iOS 12.0 and up

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
  • checkra1n Landing page
    Landing page //
    2022-02-02
  • 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.

checkra1n

Website
checkra.in
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

checkra1n features and specs

  • Compatibility
    Checkra1n is based on the checkm8 bootrom exploit, which is compatible with a wide range of older iOS devices, making it possible to jailbreak multiple versions regardless of the software updates by Apple.
  • Permanency
    Since checkra1n is based on a hardware exploit, it can jailbreak devices on any firmware version, providing a more permanent solution that isn't easily patched by software updates from Apple.
  • Community Support
    Checkra1n has a strong community of developers and users who contribute to its development and provide support for troubleshooting and enhancements.
  • Customizability
    Once jailbroken with checkra1n, users can customize their iOS experience extensively through access to apps and features not available on the official App Store.

Possible disadvantages of checkra1n

  • Limited Device Support
    Checkra1n currently supports only A7-A11 chip-equipped devices, meaning newer devices with later chips are not supported by this tool.
  • Tethered Jailbreak
    Checkra1n requires a computer to jailbreak the device, and every time the device is rebooted, it must be connected to a computer to boot into the jailbroken state.
  • Security Risks
    Jailbreaking a device exposes it to potential security vulnerabilities, as it allows for the installation of non-vetted apps and modifications that might compromise the deviceโ€™s security.
  • Possible Stability Issues
    Jailbreaking with checkra1n can lead to stability issues such as device crashes or apps not functioning correctly due to incompatibility or software conflicts.

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

checkra1n videos

What JAILBREAK Should You Use? Unc0ver, Odyssey or CheckRa1n? How to Keep It Working FAST!

More videos:

  • Tutorial - How To Jailbreak iOS 14 With checkra1n iPhone X/8/7/6/SE Mac Guide
  • Review - My experience with using Checkra1n + iCloud Bypass

ForthWrite videos

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

Add video

Category Popularity

0-100% (relative to checkra1n and ForthWrite)
Design Tools
100 100%
0% 0
Writing Tools
0 0%
100% 100
iOS Tools
100 100%
0% 0
Email
0 0%
100% 100

Questions & Answers

As answered by people managing checkra1n 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 checkra1n 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 checkra1n and ForthWrite

checkra1n Reviews

We have no reviews of checkra1n yet.
Be the first one to post

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, checkra1n seems to be more popular. It has been mentiond 67 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.

checkra1n mentions (67)

  • Have You Restarted Your Computer This Week?
    The same reason I barely restarted my iPhone for a few years. The `checkra1n` jailbreak had to be reinstalled each time (though it was easy): https://checkra.in/. - Source: Hacker News / 2 days ago
  • Kodi stopped working on AppleTV, All addons get error-check log for some reason
    No idea, as mentioned I just got lucky and came across this and it worked easy. https://checkra.in/. Source: over 2 years ago
  • Recommendations for what to use an old first Gen iPad Air (2013)
    If you do jailbreak it use checkra1n. Source: almost 3 years ago
  • [Help] iPhone 7 plus
    Oh alright, iโ€™ve been doing it on mac and the GUI from https://checkra.in/ almost made the process automatic. So if youโ€™re using Windows iโ€™m no help here. Source: about 3 years ago
  • [Question] Odysseyrain Vs. Checkrain
    So I recently learned about Odysseyra1n, before that I was using Checkra1n, and switched over to it, and based from everything l've researched and now from my own personal experience it's a lot better. So my question is, 1. Why is it so unknown like I had never heard of it before this one random Reddit comment on this sub and I'm pretty in the know about most things iPhone jailbreak... 2. For those that do know... Source: about 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.

What are some alternatives?

When comparing checkra1n and ForthWrite, you can also consider the following products

unc0ver - The most advanced jailbreak tool.

Superhuman - Superhuman is an email management tool.

WinRa1n.net - WinRa1n: The Ultimate One Click iOS Jailbreak Tool for Windows Users

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.

3uTools - 3uTools is a most efficient iOS file and data management tool for Apple users.

Lavender - Realtime coaching for sales emails.