Software Alternatives, Accelerators & Startups

Sonix.ai VS ForthWrite

Compare Sonix.ai VS ForthWrite and see what are their differences

Sonix.ai logo Sonix.ai

Automatically convert audio & video to text in minutes

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
  • Sonix.ai Landing page
    Landing page //
    2023-01-31
  • 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.

Sonix.ai

Website
sonix.ai
$ 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

Sonix.ai features and specs

  • Accuracy
    Sonix offers highly accurate transcription services, using advanced AI to deliver reliable transcriptions with minimal errors.
  • Speed
    The service provides fast transcription turnaround times, often delivering results in minutes depending on the length of the audio.
  • Multi-language Support
    Sonix supports multiple languages, making it useful for international users and businesses operating in multiple countries.
  • User-Friendly Interface
    The platform has an intuitive and easy-to-use interface, which simplifies the process of uploading, transcribing, and editing audio files.
  • Integration Options
    Sonix integrates with several popular tools like Zoom, YouTube, and Dropbox, enhancing its utility and convenience for users.
  • Searchable Transcripts
    Transcripts generated by Sonix are searchable, allowing users to quickly find specific parts of the text.

Possible disadvantages of Sonix.ai

  • Cost
    Sonix can be relatively expensive compared to some other transcription services, which may be a significant drawback for budget-conscious users.
  • Subscription Model
    The service primarily operates on a subscription basis, which may not be ideal for users who need transcription services infrequently.
  • Limitations on Free Trial
    The free trial offered by Sonix has limitations, which may not be sufficient for users to fully evaluate the platform's capabilities.
  • Accuracy in Noisy Environments
    While Sonix is generally accurate, it may struggle with transcriptions where the audio quality is poor or there is significant background noise.
  • Editing Requirement
    Despite high accuracy, users often need to make manual edits to the transcripts to ensure complete accuracy, which can be time-consuming.

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 Sonix.ai

Overall verdict

  • Sonix.ai is a reliable and efficient transcription service known for its accuracy and user-friendly interface.

Why this product is good

  • Sonix.ai provides automated transcription services that are appreciated for their speed and reasonably accurate results. It supports multiple languages and has advanced features such as speaker identification, search capabilities, and text editors for correcting transcripts. It is cloud-based, easy to use, and integrates well with other tools.

Recommended for

  • Podcasters seeking efficient transcription and editing tools
  • Researchers needing quick transcription of interviews or focus groups
  • Video producers who require text scripts for subtitles or closed captions
  • Journalists needing accurate transcriptions of interviews in multiple languages
  • Businesses looking for reliable transcription for meeting recordings

Sonix.ai videos

Review of Sonix.ai audio transcription service

More videos:

  • Review - iPhone X Ringke Mirror Case vs Sonix | Review After 1 Year
  • Review - SONIX iPhone 6/6s Case | Unboxing & Review

ForthWrite videos

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

Add video

Category Popularity

0-100% (relative to Sonix.ai and ForthWrite)
Transcription
100 100%
0% 0
Writing Tools
0 0%
100% 100
AI
97 97%
3% 3
Email
0 0%
100% 100

Questions & Answers

As answered by people managing Sonix.ai 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 Sonix.ai 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 Sonix.ai and ForthWrite

Sonix.ai Reviews

Top Otter AI Alternatives in 2024
Sonix is an audio and video transcription service that leverages industry-leading speech-to-text algorithms to convert audio and video files into text in over 38 different languages. Sonixโ€™s in-browser editor allows users to search, play, edit, organize, and share transcripts from anywhere on any device, making sharing transcriptions during meetings, lectures, or interviews...
Top 10 Podcasting Audio to Text Transcription Software
The Sonix media player is designed to help podcasters widen their audience by improving the SEO optimization for search engines like Google or Bing. Moreover, this media player assists the search engines in crawling through and indexing the content you transcribe, which makes your podcasts easier to discover. Sonix also reduces the amount of time youโ€™ll have to spend with...
The 12 Best Notta.ai Alternatives for Better Transcription in 2024
Sonix pairs its advanced transcription services with cutting-edge security measures, offering bank-level protection for your files. With SOC 2 Type 2 compliance, data encryption during transfer and storage, network security, two-factor authentication, and continuous security monitoring, Sonix ensures your data remains safe and secure.
Source: sonix.ai
15 Best AI Transcription Software & Services
Sonix.ai stands as an online platform that employs advanced artificial intelligence to provide automatic transcription services.
Source: escribr.com
Top 14 Sonix.ai Alternatives in 2025
So, if you've been using Sonix.ai, it might be worth seeing if something else suits you better. I've done extensive testing on top AI tools for basically every device and also conducted some head-to-head comparisons of Sonix.ai with a handful of other apps to create this list of 14 Sonix alternatives.
Source: www.notta.ai

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, Sonix.ai seems to be more popular. It has been mentiond 12 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.

Sonix.ai mentions (12)

  • Ask HN: Who is hiring? (August 2025)
    Sonix | Senior Full-Stack Engineer | Remote (US only) | Full-time | Ruby on Rails + React Sonix (https://sonix.ai) is an AI-powered transcription and translation platform used by thousands of businesses, researchers, media teams, and legal professionals around the world. Weโ€™re profitable, bootstrapped, and growing fast. Weโ€™re looking for a senior full-stack engineer to join our small team. Youโ€™ll work directly... - Source: Hacker News / 11 months ago
  • Help with the translation of a horror story on youtube
    There's dozens of tools out there for this these days. I'd recommend sonix.ai they give you 30 minutes free. Source: about 3 years ago
  • What is the quickest/most practical way to make podcast clips? Selecting clips, trimming, exporting etc etc.
    Do you have a budget? If so, there's this tool I've worked with called Sonix that generates transcripts of what you feed into it. It's not super accurate, but it's good enough. One of the features is that you can "highlight" chunks of text, and have it spit out an XML that will have a sequence containing only the highlighted text. Source: over 3 years ago
  • Interview with Kim Golden - Victim of 03/01/2023 Pit Bull Attack - Links in comments
    Sonix was the one I used because it had 30 free minutes and the video was only 10-11 minutes long. It seems to have done a really decent job, but not sure if that's because the source audio is pretty clear. Source: over 3 years ago
  • What do you use to transcribe your data?
    Sonix.ai does many languages and is quite good. Source: over 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 Sonix.ai and ForthWrite, you can also consider the following products

Otter.ai - Your AI meeting assistant that takes live notes and generates summaries and other insights using Meeting GenAI.

Superhuman - Superhuman is an email management tool.

Descript - Text-based audio editor and automated transcription

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.

HappyScribe - Happy Scribe automatically transcribes your interviews

Lavender - Realtime coaching for sales emails.