Software Alternatives, Accelerators & Startups

ONLYOFFICE VS ForthWrite

Compare ONLYOFFICE VS ForthWrite and see what are their differences

ONLYOFFICE logo ONLYOFFICE

ONLYOFFICE is a complete office and productivity suite.

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
  • ONLYOFFICE Landing page
    Landing page //
    2023-10-20
  • 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.

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

ONLYOFFICE features and specs

  • Compatibility
    ONLYOFFICE is highly compatible with Microsoft Office formats (DOCX, XLSX, PPTX) and also supports other common document formats like PDF, ODF, and more.
  • Collaboration
    It provides real-time collaborative editing features, allowing multiple users to work on a document simultaneously with various co-editing and commenting functionalities.
  • Cross-Platform
    ONLYOFFICE is available on multiple platforms including Windows, macOS, and Linux, enabling users to work seamlessly across different operating systems.
  • Integrations
    It integrates well with third-party services and platforms such as Google Drive, Dropbox, and Nextcloud for enhanced functionality and ease of access to files.
  • Open Source
    ONLYOFFICE offers an open-source version, giving users the ability to review, modify, and improve the source code according to their needs.
  • Interface
    The user interface is clean and modern, designed to be intuitive for users coming from other popular office suites like Microsoft Office.

Possible disadvantages of ONLYOFFICE

  • Resource Usage
    ONLYOFFICE can be resource-intensive, particularly when handling large or complex documents, which might slow down older or less powerful computers.
  • Features
    While feature-rich, it may lack some advanced functionalities available in other established office suites, particularly those tailored for very specific or advanced use cases.
  • Learning Curve
    New users, especially those accustomed to other office suites, might face a slight learning curve initially due to differences in the user interface and feature set.
  • Dependence on Internet
    Some collaboration features are dependent on internet connectivity, which can be a limitation in environments with unreliable internet access.
  • Support and Documentation
    While there is a community and some official documentation, the level of support and abundance of tutorials might not be as comprehensive as those available for more mainstream office suites.
  • Security Concerns
    As with any software that handles sensitive data, there can be concerns over data security and privacy, particularly with the cloud components of ONLYOFFICE.

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 ONLYOFFICE

Overall verdict

  • ONLYOFFICE is a solid choice for users looking for an affordable, versatile office suite that offers strong collaboration capabilities and extensive format support. Whether you need basic document handling or advanced office productivity, it can serve as a reliable alternative to pricier office solutions.

Why this product is good

  • ONLYOFFICE offers a comprehensive suite of office applications that are compatible with Microsoft Office, making it easy to use for individuals and businesses familiar with traditional office software.
  • It provides a collaborative platform which is beneficial for teams, allowing real-time co-editing and file sharing within the cloud.
  • The software supports multiple formats and offers robust functionality including document, spreadsheet, and presentation tools.
  • It has both cloud-based and on-premises deployment options, which offer flexibility depending on user needs and privacy concerns.
  • ONLYOFFICE has a clean, intuitive user interface, making it easy to navigate even for those less tech-savvy.

Recommended for

  • Small to medium-sized businesses seeking a cost-effective, collaborative office suite.
  • Educational institutions that need versatile, easy-to-use software for staff and students.
  • Individuals and teams that require compatibility with Microsoft Office formats but prefer lower cost alternatives.
  • Organizations that prioritize data privacy and flexibility in deployment, allowing optional on-premises hosting.

ONLYOFFICE videos

OnlyOffice - Key Feature Goodness

More videos:

  • Review - OnlyOffice - This may be the Office you're looking for
  • Review - OnlyOffice, a free, self hosted,, open source office suite that can replace Microsoft Office easily!

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 ONLYOFFICE and ForthWrite)
Project Management
100 100%
0% 0
Writing Tools
0 0%
100% 100
Office Suites
100 100%
0% 0
Email
0 0%
100% 100

Questions & Answers

As answered by people managing ONLYOFFICE 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 ONLYOFFICE and ForthWrite

ONLYOFFICE Reviews

25 Best Asana Alternatives & Competitors for Project Management in 2024
The next Asana alternative is ONLYOFFICE, a feature-rich project tool complete with collaborative online document editors for all types of teams and industries. In addition, ONLYOFFICEโ€™s project hierarchy is easy to customize using milestones, tasks, and subtasks for optimal organization.
Source: clickup.com
Top Alternatives to Microsoft Office Suite
ONLYOFFICE combines document editing, project management, and CRM capabilities in a single platform. Its versatility and integration options make it suitable for businesses looking to centralize their operations.
Source: saaszeal.com
The Best 21 Sharepoint Alternatives in 2019
ONLYOFFICE will let you doubt the necessity of a physical office by offering hosting services with many additional features. Hosting companies are experts at securing online information. Because theyโ€™re knowledgeable about hosting, they can help you keep your companyโ€™s documents safe. They have expert encryption procedures and portal access features. This means you can store...
7 SharePoint Alternatives that Actually Get the Job Done
ONLYOFFICE is a cloud office solution to help teams share documents. Its primary selling point is that itรขย€ย™s compatible with Microsoft Suite. While itรขย€ย™s not that sophisticated, ONLYOFFICE is certainly cheaper than some other SharePoint alternative options.
Source: www.process.st

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 ONLYOFFICE and ForthWrite, you can also consider the following products

LibreOffice - Free office suite, open source, and compatible with .doc, .docx, .xls, .xlsx, .ppt, .pptx files. Updated regularly โ€“ download for free. Originally based on OpenOffice.org.

Superhuman - Superhuman is an email management tool.

Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.

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.

Redmine - Flexible project management web application

Lavender - Realtime coaching for sales emails.