Software Alternatives, Accelerators & Startups

SoundSource VS ForthWrite

Compare SoundSource VS ForthWrite and see what are their differences

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SoundSource logo SoundSource

The sound control that should be built into MacOS

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.
  • SoundSource Landing page
    Landing page //
    2021-10-12
  • 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.

SoundSource

Pricing URL
-
$ Details
-
Platforms
-
Release Date
-

ForthWrite

$ Details
freemium $12 / 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

SoundSource features and specs

  • Comprehensive Audio Control
    SoundSource offers detailed control over audio inputs, outputs, and effects, allowing users to finely tune their sound settings for various applications.
  • User-Friendly Interface
    The software features an intuitive and easy-to-navigate interface, making it accessible even to those who are not tech-savvy.
  • Application-Specific Settings
    Users can apply unique audio settings and effects to individual applications, providing flexibility and customization.
  • Advanced Audio Effects
    Includes built-in audio effects such as EQ, volume boosting, and more, enriching the listening experience.
  • Menu Bar Access
    SoundSource exists as a menu bar app, providing quick and convenient access to audio settings without needing to open a full application.
  • High-Quality Audio
    SoundSource maintains audio quality, providing clear and distortion-free sound even after adjustments.

Possible disadvantages of SoundSource

  • Price
    SoundSource is a paid application, which can be a drawback for users looking for free solutions.
  • macOS Only
    The software is available exclusively for macOS, limiting its accessibility for Windows and Linux users.
  • Performance Overhead
    Some users may experience a slight performance overhead, especially on older machines, due to the processing power required for real-time audio adjustments.
  • Learning Curve
    Despite its user-friendly interface, there can be a learning curve for new users to take full advantage of all features and settings.
  • Limited Trial Period
    The application offers a limited trial period, which may not be sufficient for some users to thoroughly evaluate all features before purchasing.

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 SoundSource

Overall verdict

  • SoundSource is considered a good choice for Mac users who need advanced audio control and customization. Its features cater well to audiophiles, professionals, and anyone who requires precise audio management.

Why this product is good

  • SoundSource by Rogue Amoeba is often praised for its intuitive user interface and powerful audio management capabilities. It allows users to control per-application audio levels, apply audio effects, and improve sound quality on their Mac. Users appreciate the customization options and the ability to route audio between different output devices seamlessly.

Recommended for

  • Audiophiles looking for high-quality sound control.
  • Professionals requiring detailed audio management for various applications.
  • Users who frequently switch audio output devices and need a streamlined way of managing audio routing on their Mac.

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

SoundSource videos

Using Rogue Amoeba's SoundSource to Control Audio on Your Mac - SoundSource Review

More videos:

  • Review - SoundSource Review for OS X

ForthWrite videos

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

Add video

Category Popularity

0-100% (relative to SoundSource and ForthWrite)
Note Taking
100 100%
0% 0
Email
0 0%
100% 100
Audio
100 100%
0% 0
Email Productivity
0 0%
100% 100

Questions & Answers

As answered by people managing SoundSource 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 SoundSource and ForthWrite

SoundSource Reviews

We have no reviews of SoundSource 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, SoundSource seems to be more popular. It has been mentiond 127 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.

SoundSource mentions (127)

  • Our Commitment to Windows Quality
    Per-app mixing on the first-level menu. I like SoundSource on macOS for the same reason: https://rogueamoeba.com/soundsource/. - Source: Hacker News / 5 months ago
  • Show HN: A macOS app to prevent sound quality degradation on AirPods
    Do I need this if I already use something like SoundSource[1] to manually set the input source that's not the AirPods microphone? [1] https://rogueamoeba.com/soundsource/. - Source: Hacker News / almost 2 years ago
  • 5 years ago Valve released Proton forever changing Linux gaming
    This is hilariously biased. This is HN, you're not talking to people who don't know what Linux is. Hell, a huge portion of us are linux engineers of various sorts. You're also in a thread literally about a linux app. Anyway. I would never, ever use Linux as a desktop environment over OSX after the experiences I've had with it over the last 20+ years. OSX GUI applications absolutely blow everything that Linux has... - Source: Hacker News / about 3 years ago
  • Best EQ for Mac 2023
    Https://rogueamoeba.com/soundsource/ (this has parametric EQ but it's a bit buried IIRC. It also has built-in support for AutoEQ according to this page so you might have to do almost nothing if you like the Harman curve). Source: about 3 years ago
  • Detailed audio device control?
    I've looked at https://rogueamoeba.com/soundsource/ and the features it has seems okay such as per-app volume levels. But I'd like it so when I connect a certain pair of headphones, then a pre-defined output and input device is set. So for Headphone A, the output might be set to this pair but the mic will be the build-in mic in my Macbook. And for Headphone B, both the output and input should be set to this... 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 SoundSource and ForthWrite, you can also consider the following products

Sound Control - App-specific volume control

ReclaimAI - Helps users prioritize their work and personal calendars

Loopback by RogueAmoeba - Get all the power of a high-end studio mixing board, right inside your Mac!

Superhuman - Superhuman is an email management tool.

eqMac 2 - The open-source macOS audio optimizer ๐ŸŽ›๏ธ

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