Software Alternatives, Accelerators & Startups

calculator.net VS ForthWrite

Compare calculator.net VS ForthWrite and see what are their differences

Note: These products don't have any matching categories. If you think this is a mistake, please edit the details of one of the products and suggest appropriate categories.

calculator.net logo calculator.net

Online calculator for quick calculations, along with a large collection of calculators on math, finance, fitness, and more, each with related in-depth information.

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
  • calculator.net Landing page
    Landing page //
    2020-01-01
  • 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.

calculator.net

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

calculator.net features and specs

  • Comprehensive Range of Calculators
    Calculator.net offers a wide variety of calculators that cover different categories such as financial, health, math, and fitness, catering to diverse user needs.
  • User-Friendly Interface
    The website design is straightforward and easy to navigate, making it accessible even for users who are not tech-savvy.
  • Free Access
    Most of the calculators are freely accessible, allowing users to utilize the tools without any subscription or payment.
  • Detailed Explanations
    Some calculators provide detailed explanations and examples of the calculations, which can help users understand the process.

Possible disadvantages of calculator.net

  • Ad-Supported
    The website contains advertisements, which may be distracting or intrusive for some users.
  • Limited Advanced Features
    For advanced technical or scientific calculations, the site may not be as comprehensive compared to specialized tools or software.
  • Inconsistent Update Frequency
    The frequency of updates or new calculator additions is not consistent, which may lead to outdated features or data.

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

calculator.net videos

Calculator.net

More videos:

  • Tutorial - How to analyze rental properties quickly and for free using Calculator.net

ForthWrite videos

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

Add video

Category Popularity

0-100% (relative to calculator.net and ForthWrite)
Online Calculators
100 100%
0% 0
Writing Tools
0 0%
100% 100
Calculators
100 100%
0% 0
Email
0 0%
100% 100

Questions & Answers

As answered by people managing calculator.net 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 calculator.net 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 calculator.net and ForthWrite

calculator.net Reviews

We have no reviews of calculator.net 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, calculator.net seems to be more popular. It has been mentiond 72 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.

calculator.net mentions (72)

  • Buying a house...those 'how not to be house poor' calculators...
    Back to the 'how much house can I afford', I saw one on NerdWallet, its numbers were all over the place, another simple one calculator.net here, claims the house we can afford is $471,778 (and $31,000 down). We found a new build with incentives and rate buy down that essentially will be 463,000 some odd, after the pmi up front for the FHA loan, our rate is 6%. So financing like $437,000. Source: over 2 years ago
  • Should I try to pay off my student loans as soon as possible or take it slow?
    You could tackle it head on and do $1,000/mo. Per calculator.net, you would end up paying it all off in 15 months, costing you ~$14,450 including interest. Splendid, you're done. Source: almost 3 years ago
  • I can't quite figure out my recommended calorie intake
    So I'm making myself a cutting diet to lose weight and after using 2 different website to find my recommended calorie intake, and having the exacte same settings on both, calculator.net gives me a 1lb lost/week of 2900 cal/day, fatsecret.com says I need to eat 4000 cal/day. Source: almost 3 years ago
  • Using Flat Payment instead of Minimum Balance to pay debt off
    Yes and no, I think I should of been a little more descriptive with what I was explaining so ill use some generic numbers. I used calculator.net for this pay off time frame. Source: about 3 years ago
  • Bugbear gt overreaction
    Start of the game I generate my fate pool: 3,4,5,4,5,4,1,4,4,2,4,1,1,6,2 (i used calculator.net to roll for me) and hide my doom machine behind a building. 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 calculator.net and ForthWrite, you can also consider the following products

Omni Calculator - Helping you make rational decisions, one calculation at a time.

Superhuman - Superhuman is an email management tool.

CALCULATOR.IO - Your go-to solution for fast, accurate computations

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.

Calculator-online.net - The 100% free and reliable online calculators that help you to solve any calculation-related problems and provides you with the precise measurements.

Lavender - Realtime coaching for sales emails.