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Soulver VS ForthWrite

Compare Soulver VS ForthWrite and see what are their differences

Calcumber
Calculate in a notebook and share โ€” from everyday math to engineering. featured
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Contents:
  1. ยป Base Details
  2. ยป Videos
  3. ยป Reviews
  4. ยป Alternatives

Soulver logo Soulver

Soulver is a software application that functions as a calculator that allows you type a continuous stream of information rather than having to input data into multiple cells.

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
  • Soulver Landing page
    Landing page //
    2023-06-22
  • 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.

Soulver

Website
acqualia.com
Pricing URL
-
$ Details
-
Platforms
-
Release Date
-
Edit details

ForthWrite

Website
forthwrite.ai
Pricing URL
Official ForthWrite Pricing
$ 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
Edit details

Soulver features and specs

  • Intuitive Interface
    Soulver offers a user-friendly interface that combines the simplicity of a notepad with the power of a calculator, making it easy to use even for non-technical users.
  • Live Calculations
    The app performs calculations as you type, providing real-time results without needing to press a special 'calculate' button.
  • Natural Language Processing
    Soulver understands natural language inputs, allowing you to write out calculations in plain English, which can be more intuitive than traditional formula-based approaches.
  • Versatile Units and Conversions
    The app can handle multiple types of units and perform conversions seamlessly, making it useful for various fields like engineering, finance, and everyday calculations.
  • Save and Organize Work
    Soulver allows users to save their work and organize it into files and folders, making it convenient to manage multiple projects or long-term records.
  • Cross-Platform Syncing
    With support for iCloud syncing, users can access their calculations across multiple Apple devices, maintaining continuity and ease of access.

Possible disadvantages of Soulver

  • Mac and iOS Only
    Soulver is currently available only on Mac and iOS, limiting its accessibility for users on other platforms like Windows or Android.
  • Price
    Soulver is a paid application, and while it offers a lot of features, it might be considered expensive compared to free alternatives.
  • Learning Curve
    Despite its intuitive design, new users might take some time to fully understand all the features and capabilities of the software.
  • Limited Programming Capability
    While it's great for quick calculations and conversions, Soulver is not designed to handle more complex programming tasks or advanced statistical analysis, which might be a downside for power users.
  • No Android/Windows Sync
    Even if users have multiple devices, they can only sync their work across Apple devices, not with devices running on Android or Windows.
  • Dependency on Ecosystem
    Since it relies heavily on iCloud for syncing and other features, users are somewhat locked into the Apple ecosystem to get the most out of Soulver.

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 Soulver

Overall verdict

  • Soulver is a good choice for users who need a more flexible tool for calculations than a traditional calculator or spreadsheet offers. Its blend of features makes it stand out as a versatile computational tool.

Why this product is good

  • Soulver is regarded as a unique hybrid between a calculator and a text editor, allowing users to perform calculations using natural language. It is particularly useful for those who work with numbers in a more narrative or exploratory context rather than in strict spreadsheet formats. Soulver is praised for its intuitive interface, ease of use, and ability to handle quick, ad-hoc calculations with ease.

Recommended for

  • People who need to perform quick calculations in a narrative or exploratory manner.
  • Users who appreciate an intuitive interface for number crunching without the rigidity of spreadsheets.
  • Professionals who require a seamless way to mix calculations with text for clear documentation and communication.

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

Soulver videos

+ Add

Soulver for iOS Review: Notepad Calculator for iPhone & iPad

More videos:

ForthWrite videos

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

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Category Popularity

0-100% (relative to Soulver and ForthWrite)

Soulver

ForthWrite

Calculators
100 100%
Calculators
0% 0
Email
0 0%
Email
100% 100
Advanced Calculator
100 100%
Advanced Calculator
0% 0
Email Productivity
0 0%
Email Productivity
100% 100

Questions & Answers

As answered by people managing Soulver 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 Soulver 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 Soulver and ForthWrite

Soulver Reviews

The 15 Best AI Tools to Solve Math Problems
Soulver: Soulver is a unique math app that combines a notepad with a calculator, allowing users to perform calculations and solve math problems in a natural, intuitive way. Its AI-powered algorithms provide instant results and support complex mathematical expressions.
Source: www.mathsolver.top

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)

What are some alternatives?

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

Numi App - Numi is a beautiful text calculator for Mac.

ReclaimAI - Helps users prioritize their work and personal calendars

SpeedCrunch - SpeedCrunch. SpeedCrunch is a high-precision scientific calculator featuring a fast, keyboard-driven user interface. It is free and open-source software, licensed under the GPL. Download Documentation Donateย .

Superhuman - Superhuman is an email management tool.

Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.

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

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