Oso VS ForthWrite
Compare Oso VS ForthWrite and see what are their differences
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Oso
Cerbos
authzed
Aserto
Warrant
Ory
Permit.io
Topaz.sh
ForthWrite
ReclaimAI
Superhuman
Shortwave
Serif AI
Gemini
Gmail
LIAM
Drop Oso Cloud into your apps to quickly add roles, sharing, fine-grained access, or any other access model you can think of.
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
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.
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ForthWrite's answer:
Next.js, React, Supabase, Anthropic Claude, OpenAI, Stripe, Vercel, Chrome Extensions API
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.
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.
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.
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.
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.
Based on our record, Oso seems to be more popular. It has been mentiond 7 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.
When the third case starts popping up, that's when an authorization provider like Oso or Permit.io starts to sound appealing. Centralized, easily readable authorization logic combined with easy queries for "what users are allowed to perform this action?" sounds great when your authorization logic starts to get a bit too complex. And we're finding a few cases where our authorization logic is getting too hard to... - Source: dev.to / about 2 years ago
I know of warrant.dev, osohq.com, and Ory Keto but I don't see that these evaluate based on attributes. Source: over 3 years ago
Oso supports applying authorization logic at the ORM layer so that you can efficiently authorize entire data sets. For example, suppose you have millions of posts in a social media application created by thousands of users, and regular users are only authorized to view posts from their friends. It would be inefficient to fetch all of the posts and authorize them one by one. It would be much more efficient to... Source: about 5 years ago
Oso's Node library now provides a configuration-based approach to adding role-based access control (RBAC) to your application. This new library speeds up the time it takes to build fine-grained permissions using roles and related patterns. Here are the docs + quickstart. Source: about 5 years ago
> It's crazy this still is part of the stack where there are no great solutions. Seems like a few others have come to the same conclusion :) We're working on this at Oso (https://osohq.com) - I'm the CTO. Oso is an open source framework for authorization. Policies can reference application directly, so any authorization decisions can be made dynamically based on the data. And your data doesn't need to leave your... - Source: Hacker News / about 5 years ago
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.
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.
Aserto - Fine-grained, scalable authorization in minutes
Shortwave - Email smarter & faster with a reinvented experience for your Gmail