Software Alternatives, Accelerators & Startups

Orbiter VS ForthWrite

Compare Orbiter VS ForthWrite and see what are their differences

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Orbiter logo Orbiter

Orbiter is a realistic 3D real-time space flight simulator program. Official site with free download. DownloadDownload mirror 1 Europeย - Texturesย - Galleryย - Linksย - .

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
  • Orbiter Landing page
    Landing page //
    2018-11-21
  • 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.

Orbiter

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

Orbiter features and specs

  • Comprehensive Data Access
    Orbiter provides users with extensive access to a range of medical physics databases and resources, facilitating in-depth research and learning.
  • User-Friendly Interface
    The platform offers a straightforward and intuitive interface, making it easy for users to navigate and find the resources they need.
  • Collaborative Features
    Orbiter supports collaboration among users, allowing for shared projects and discussions, which enhances the research experience.
  • Regular Updates
    The platform is regularly updated with the latest resources and data, ensuring that users have access to current and relevant information.
  • Educational Support
    Orbiter includes educational tools and resources that aid in the learning and teaching of medical physics concepts.

Possible disadvantages of Orbiter

  • Limited Accessibility
    Access to Orbiter may be restricted to certain institutions or individuals, limiting its availability to a broader audience.
  • Dependence on Internet Connection
    As an online platform, Orbiter requires a stable internet connection, which can be a limitation in areas with poor connectivity.
  • Potential for Information Overload
    Given the wide array of resources available, users might experience difficulty in managing and prioritizing the vast amount of information.
  • Learning Curve
    New users might face a learning curve in understanding how to utilize all the features and resources effectively.
  • Technical Issues
    Users might occasionally encounter technical difficulties or glitches while navigating or using the platform.

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

Orbiter videos

Orbiter 9 Netflix Review

More videos:

  • Review - ARRI Orbiter LED Light | Hands-on Review
  • Review - Orbiter - Super light weight direct drive extruder on Seckit SK-GO

ForthWrite videos

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

Add video

Category Popularity

0-100% (relative to Orbiter and ForthWrite)
Space Simulator
100 100%
0% 0
Email
0 0%
100% 100
Simulation
100 100%
0% 0
Email Productivity
0 0%
100% 100

Questions & Answers

As answered by people managing Orbiter 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 Orbiter 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 Orbiter and ForthWrite

Orbiter Reviews

We have no reviews of Orbiter 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, Orbiter seems to be more popular. It has been mentiond 38 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.

Orbiter mentions (38)

  • Honda Conducts Successful Launch and Landing of Experimental Reusable Rocket
    You can use realistic simulators like: http://orbit.medphys.ucl.ac.uk/ (it's free and open-source: https://github.com/orbitersim/orbiter ) so it means that now the main problem is building the hardware, but the software part is mostly solved. Before there were no simulators, and barely usable computers. - Source: Hacker News / about 1 year ago
  • Physics video games
    Orbiter is more of a hardcore spacesim than a "game" in traditional sense, but also qualify. Source: over 2 years ago
  • What about adding more planets?
    Orbiter does it, but I doubt the solution they use (whatever it is) would work with the game engine Nova uses. Reentry does it too. I guess it depends on how the game has been coded. Probably difficult to implement if it wasn't designed with time compression in mind to start with. Source: almost 3 years ago
  • So uhmโ€ฆ I wanna fly a space shuttle.
    Kerbal (KSP) is one way, but I would highly encourage you to seek out Orbiter Space Flight Simulator 2016 here http://orbit.medphys.ucl.ac.uk/ (all free) and its forum here https://www.orbiter-forum.com/. Tens of thousands of hours of work here for your enjoyment, when you look at the base simulator (Dr. Martin Schweiger's work), the rendering engines, the vessels, the mods and the expertise from the community ...... Source: about 3 years ago
  • We really need a Microsoft Space SimulatorX
    Iโ€™ve searched a bit and found this: http://orbit.medphys.ucl.ac.uk/ Has anyone played orbiter ? 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 Orbiter and ForthWrite, you can also consider the following products

FlightGear - The FlightGear flight simulator project is an open-source, multi-platform, cooperative flight simulator development project. It also simulates space flight in Earth's orbit. It's flight dynamics engine (JSBSim) is used in a 2015 NASA benchmark.

ReclaimAI - Helps users prioritize their work and personal calendars

X-Plane - The world's most advanced flight simulator just got an upgrade. Download the free demo today for Windows, macOS, & Linux.

Superhuman - Superhuman is an email management tool.

Birds of Steel - Birds of Steel is developed by Gaijin Entertainment for PlayStation and Xbox.

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