Software Alternatives, Accelerators & Startups

Runtastic VS ForthWrite

Compare Runtastic VS ForthWrite and see what are their differences

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Runtastic logo Runtastic

Runtastic offers a series of fitness apps that can be used to track your running, walking, hiking, and cycling, as well as many other fitness routines. Read more about Runtastic.

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
  • Runtastic Landing page
    Landing page //
    2023-09-26
  • 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.

Runtastic

Pricing URL
-
$ Details
-
Platforms
-
Release Date
-
Startup details
Country
Austria

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

Runtastic features and specs

  • User-friendly Interface
    The application has an intuitive and easy-to-navigate user interface, making it accessible for users of all experience levels.
  • Comprehensive Tracking
    Runtastic offers detailed tracking features for various activities such as running, cycling, and hiking, allowing users to monitor their progress accurately.
  • Integration with Wearables
    Supports integration with various wearable devices like Apple Watch and Garmin, enhancing the tracking experience.
  • Social Features
    Includes social features such as sharing achievements, competing with friends, and participating in community challenges to keep users motivated.
  • Training Plans
    Provides personalized training plans designed by professional coaches to help users achieve specific fitness goals.

Possible disadvantages of Runtastic

  • Subscription Costs
    Many advanced features, including training plans and certain tracking functionalities, are locked behind a paid subscription.
  • Battery Usage
    The app can be battery-intensive, especially during prolonged use, which could be inconvenient for users on long activities or with older devices.
  • Inconsistent GPS Accuracy
    Some users report issues with GPS accuracy, which can impact the precision of activity tracking.
  • Privacy Concerns
    Users need to be aware of data privacy, as the app tracks extensive personal information and uses it for targeted advertising.
  • Resource Intensity
    The app can be resource-intensive, requiring significant storage space and potentially slowing down older devices.

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 Runtastic

Overall verdict

  • Runtastic is a solid choice for individuals looking for a robust and versatile fitness app. With its focus on running and a wide range of additional features, it appeals to both beginners and more experienced athletes. While some features may require a premium subscription, the app offers ample free resources to get started.

Why this product is good

  • Runtastic, now rebranded as Adidas Running, is generally considered a good fitness app due to its comprehensive tracking features for a variety of activities, including running, biking, and walking. It offers GPS tracking, workout statistics, customizable training plans, and integration with other health and fitness apps. Users also appreciate its social features, which allow them to share progress with friends and join challenges, helping to boost motivation and commitment.

Recommended for

    Runtastic is recommended for runners and fitness enthusiasts who enjoy tracking their workouts and progress. It's also suitable for those who benefit from social interaction and challenges to maintain motivation. Whether you are training for a race or starting a fitness journey, Runtastic's comprehensive tools can support a variety of fitness goals.

Runtastic videos

Runtastic app - The App Review Show Episode 45/365

More videos:

  • Review - The BEST Running APPS in 2020 | Feat. Strava, Garmin Connect, Adidas Running by Runtastic and more!
  • Review - Runtastic Results 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 Runtastic and ForthWrite)
Health And Fitness
100 100%
0% 0
Writing Tools
0 0%
100% 100
Sport & Health
100 100%
0% 0
Email
0 0%
100% 100

Questions & Answers

As answered by people managing Runtastic 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 Runtastic 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 Runtastic and ForthWrite

Runtastic Reviews

10 Best MyFitnessPal Alternatives
Runtastic is a flexible fitness app that helps you track your workouts, even when you're running, cycling, or engaging in otheยญr outdoor activities. This MyFitnessPal Alternative offers specific training plans and a variety of workouts to cater to differeยญnt fitness levels.
The 20 Best Health and Fitness Apps of 2023
Social Sharing โ€“ Runtastic (Adidas Running) allows you to share your running achievements, routes, and progress with friends and the appโ€™s community.
10 Best Strava Alternatives Apps (2023) โ€“ Apps Like Strava
Adidas Running, offered by the worldโ€™s biggest sports brand Adidas, is another fitness and running tracker app which is a very similar app, Strava. Its GPS tracker and pedometer tracker are always in your direction on the fitness journey.
Source: techdator.net
14 Best Strava Alternatives and Similar Apps
As stated in its name, this Runtastic app is known for its running regime. Adidas Runtastic for running is free, but itโ€™s completely up to you to update it to premium. The free version tracks your calorie burnt, pace, and speed.

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, Runtastic seems to be more popular. It has been mentiond 1 time 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.

Runtastic mentions (1)

  • Can GW4 run multiple fitness apps at the same time?
    Workaround is to use SHealth only, export gpx file, then import it through runtastic.com (Profile (Arrow Next to profile picture) ->Settings->Activity Import). The imported workout count for the challenges. Source: almost 4 years ago

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 Runtastic and ForthWrite, you can also consider the following products

Strava - The #1 app for runners and cyclists

Superhuman - Superhuman is an email management tool.

RunKeeper - Join the community of over 45 million runners who make every run amazing with Runkeeper. Track your workouts and reach your fitness goals!

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.

MyFitnessPal - Track the number of calories that you consume each day with MyFitnessPal. The app also lets you create a diet and track the exercise that you complete each day whether it's walking, running or some other type of program.

Lavender - Realtime coaching for sales emails.