Software Alternatives, Accelerators & Startups

Cerbos VS ForthWrite

Compare Cerbos VS ForthWrite and see what are their differences

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Cerbos logo Cerbos

Cerbos helps teams separate their authorization process from their core application code, making their authorization system more scalable, more secure and easier to change as the application evolves.

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.
  • Cerbos Landing page
    Landing page //
    2023-08-21

Cerbos is a self-hosted, open source authorization layer that separates your authZ logic from your core application code.

Cerbos allows for swift and secure set up and modification of complex roles and permissions. Unlike traditional methods that require intricate code manipulation, Cerbos simplifies the process by making changes through configuration. This reduces risks associated with authZ changes, such as downtime or security incidents.

Cerbos' structure, independent from the app code, allows both business stakeholders and non-expert engineers to understand the permissions structure. A broader range of stakeholders can make changes to the authZ logic without needing extensive coding knowledge or risking the stability of the core application.

In an era where authZ logic is business logic, the ability to quickly adapt and scale this element is vital. Cerbos makes this possible, facilitating an agile response to new markets and customer needs while maintaining a mature product.

  • 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 / 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

Cerbos features and specs

  • Flexibility
    Cerbos is designed to be highly flexible, allowing for complex policy definitions and use cases that can accommodate a wide range of authorization needs.
  • Scalability
    Cerbos can handle large volumes of authorization requests efficiently, making it suitable for applications that need to scale.
  • Compatibility
    It can be easily integrated with various existing systems and technologies, thanks to its support for standard protocols and formats.
  • Open Source
    As an open-source project, Cerbos offers transparency, extensibility, and community support, allowing users to contribute and customize their own solutions.

Possible disadvantages of Cerbos

  • Complexity
    The flexibility and features of Cerbos might introduce a steeper learning curve for new users who are not familiar with authorization systems.
  • Resource Intensive
    Depending on the deployment and configurations, running a Cerbos instance might require significant resources, which could be a consideration for smaller projects.
  • Limited Documentation
    Users might find that certain advanced features or integrations are not as well-documented, potentially leading to difficulties in implementation.

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 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

Cerbos videos

Cerbos - How It Works - Intro

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 Cerbos and ForthWrite)
Developer Tools
100 100%
0% 0
Email
0 0%
100% 100
Security
100 100%
0% 0
Email Productivity
0 0%
100% 100

Questions & Answers

As answered by people managing Cerbos and ForthWrite.

Which are the primary technologies used for building your product?

Cerbos's answer

  • Go
  • Protobuf
  • gRPC
  • CEL

ForthWrite's answer:

Next.js, React, Supabase, Anthropic Claude, OpenAI, Stripe, Vercel, Chrome Extensions API

What makes your product unique?

Cerbos's answer

Cerbos stands out in the crowded authorization landscape due to its innovative approach to managing roles and permissions. Unlike traditional systems that embed authorization logic within an application's core code, Cerbos introduces a standalone, self-hosted, stateless service, transforming intricate coding tasks into simpler configurations. This separation not only streamlines the authorization process but also reduces potential security risks and system bottlenecks.

Being open-source, Cerbos fosters a strong community backing, ensuring its evolution aligns with real-world developer needs. Its adaptability is evident in its support for multiple SDKs, YAML configuration, and dynamic context handling, which cater to a wide range of environments and use-cases. This flexibility is further enhanced by Cerbos Cloud, a premium solution offering advanced policy management tools.

Furthermore, Cerbos emphasizes transparency, allowing both technical and non-technical stakeholders to understand and modify the permissions structure. This democratization of authorization logic management reduces reliance on specialized coding expertise. Additionally, its commitment to robust security features, including audit logging and risk mitigation, ensures that businesses can trust Cerbos to safeguard their authorization processes.

In essence, Cerbos' unique blend of innovation, adaptability, community support, and security focus reshapes the way businesses approach and manage authorization, making it a game-changer in the field.

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.

How would you describe the primary audience of your product?

Cerbos's answer

Cerbos' primary audience is best described as forward-thinking engineering leaders at the helm of emerging startups, particularly within the FinTech and Software Development sectors. These leaders typically oversee small to medium-sized teams, with 5-20 engineers, in companies that have a workforce ranging from 0 to 100 employees. Their technological stack prominently features Kubernetes (k8s), indicating a modern and scalable infrastructure.

Financially, these companies are in their early growth stages, having secured funding between 0 to 10 million dollars, primarily in the Seed to Series A range. This suggests that they are in a phase of rapid expansion and are actively seeking solutions that can seamlessly scale with their growth.

The primary objectives of Cerbosโ€™ users revolve around finding a reliable solution to their authorization challenges, ensuring that the chosen solution can be implemented without disruptions, and that it scales effortlessly as the company grows. In essence, the Cerbos champion is a visionary engineering leader, keen on adopting innovative solutions that align with their company's rapid growth trajectory.

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?

Cerbos's answer

Cerbos, co-founded by Emre and Charith, emerged from a vision to revolutionize the way authorization is approached in modern, cloud-native applications. The duo recognized a persistent challenge in software development: the immense time and effort developers invest in crafting and continually updating custom permissions. This repetitive cycle not only consumes valuable time but also diverts attention from the core essence of product development.

Driven by this realization, Emre and Charith embarked on a mission with Cerbos: to make the implementation of access-control as seamless and painless as possible. Their goal was to eliminate the need for repeatedly writing and rewriting custom permissions implementations. Instead, they envisioned a world where developers could channel their energies and creativity into building outstanding products that resonate with and delight their customers.

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.

Who are some of the biggest customers of your product?

Cerbos's answer

Why should a person choose your product over its competitors?

Cerbos's answer

A person should choose Cerbos over its competitors for several compelling reasons:

Innovative Design: Unlike many competitors, Cerbos separates the traditionally embedded authorization logic from the application's core code. This standalone, stateless service simplifies authorization changes, converting intricate coding tasks into straightforward configurations.

Open-Source Flexibility: Cerbos' open-source nature ensures continuous evolution based on real-world feedback. This community-driven approach ensures that the product remains relevant and adaptable to changing needs.

Transparency and Inclusivity: Cerbos' structure allows a broader range of stakeholders, both technical and non-technical, to understand and modify the permissions structure. This democratizes the authorization process, reducing the dependency on specialized coding expertise.

Robust Security: Cerbos places a strong emphasis on security, offering features like audit logging and risk mitigation. This commitment ensures businesses can trust Cerbos to maintain the integrity of their authorization processes.

Flexibility and Control: Cerbos provides complete control over its deployment, scaling, and monitoring. Unlike solutions that are solely cloud-based or hardcoded, Cerbos strikes a balance between flexibility, control, and security.

Clear Value Proposition: Cerbos offers straightforward pricing and a user-friendly approach, contrasting with competitors that may have complex pricing structures or less intuitive systems.

Community and Support: As an open-source project, Cerbos boasts a strong community backing, ensuring users have access to a wealth of knowledge and support.

In summary, Cerbos' unique blend of innovation, flexibility, transparency, and security makes it a superior choice in the authorization landscape.

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.

User comments

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Reviews

These are some of the external sources and on-site user reviews we've used to compare Cerbos and ForthWrite

Cerbos Reviews

We have no reviews of Cerbos yet.
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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, Cerbos seems to be more popular. It has been mentiond 6 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.

Cerbos mentions (6)

  • Show HN: Authorization game โ€“ matching requests to permission policies
    I wanted to get back to coding and play around with a simple way to explain how our product works(permission management platform, https://cerbos.dev). So I built the Cerbos Game, where players match incoming requests to permission policies and decide to ALLOW or DENY them; just like our product does for software apps. This game disrupted our engineering teamโ€™s daily work as they competed to beat the high score.... - Source: Hacker News / over 1 year ago
  • Nuxt authorization: How to implement fine-grained access control
    In this tutorial you will learn how to use Cerbos to add fine-grained access control to any Nuxt web application, simplifying authorization as a result. - Source: dev.to / over 2 years ago
  • ๐Ÿ–Œ๏ธโš™๏ธ Innovate Like Da Vinci: Blending Art and Science in Software Development
    In my work with Cerbos, I apply the lessons learned from Da Vinci to tackle authorization challenges. Our approach is to create solutions where functionality seamlessly integrates with developer experience. Constantly iterating and viewing the tools through the users' lens, helps ensure that our access control solutions are robust and dev-friendly. - Source: dev.to / over 2 years ago
  • Feedback needed: Cerbos Hub is now in public beta!
    Hello fellow devs! I'm with Cerbos (https://cerbos.dev/), a tool designed to manage who can do what in your software applications. - Source: dev.to / almost 3 years ago
  • Show HN: Cerbos Hub โ€“ Implement roles and permissions in your app in minutes
    Hello HN! I'm on the DevRel team at Cerbos (https://cerbos.dev/), a tool designed to manage who can do what in your software applications. For a couple of years now, Open Worldwide Application Security Project (OWASP) is naming authorization a top 10 API security risk: https://owasp.org/API-Security/editions/2023/en/0x11-t10/ We are thrilled to announce that Cerbos Hub is now in public beta! - Source: Hacker News / almost 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 Cerbos and ForthWrite, you can also consider the following products

Aserto - Fine-grained, scalable authorization in minutes

ReclaimAI - Helps users prioritize their work and personal calendars

authzed - The platform to store, compute, and validate app permissions

Superhuman - Superhuman is an email management tool.

Oso - A batteries-included system for authorization.

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