Calensync
OneCal.io
SyncThemCalendars
CalendarBridge
ChronoLink
Calendar Family
ReclaimAI
Calendar Sync +
ForthWrite
ReclaimAI
Superhuman
Shortwave
Serif AI
Gemini
Gmail
LIAM
The moment you start using multiple calendars, a ticking bomb is fused: when will the first event conflict happen? Calensync allows you to simply keep your calendars synchronized, while providing full control about how events are shared.
Calensync can easily be used to synchronize Google and Outlook accounts, and also allows iCalendars as a source.
Want to create a synchronization, but mark all the events as "Personal"? Yes, you can โ
Want to add a prefix or a suffix to event names, for example "Stand-up" -> "[Work] Stand-up"? Yes, you can โ
Want to filter events based on a keyword or some regex? Believe it or not, Yes, you can โ
As an added feature part of the offering, we also offer a simple way to create shareable scheduling links, giving you all the cards in your hand to increase your productivity!
With Calensync, you can effortlessly synchronize multiple Google Calendars, avoiding all possible future conflicts. Onboarding takes less than 2 minutes, and your calendar will immediately sync with each other!
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.
Calensync ForthWriteCalensync's answer
Open-source, infinite calendars, and cheaper pricing.
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.
Calensync's answer
Pricing not based on number of accounts / calendars, as well as simply cheaper.
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.
Calensync's answer
Freelancers, entrepreneurs that deal with multiple businesses and accounts, or anyone who has multiple google calendars.
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.
Calensync's answer
The story starts from frustration. I have multiple professional google calendars, as well as my personal one. On the professional ones, people can book events directly and, unfortunately, I had multiple conflicts. This lead me to first check for existing solutions and after being dissatisfied, deciding to create it myself.
No more conflicts between events since Calensync!
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.
Calensync's answer
Backend: - Python + FastAPI - API Gateway with Cloudfront - Postgres for DB Frontend: - React - Bootstrap
ForthWrite's answer:
Next.js, React, Supabase, Anthropic Claude, OpenAI, Stripe, Vercel, Chrome Extensions API
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, Calensync 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.
Recently, I received this suggestion from a user of one of my running projects that does calendar synchronization across Google, Outlooks, and iCalendar:. - Source: dev.to / over 1 year ago
OneCal.io - Sync Outlook and Google Calendars in real-time, share booking links, and view all your calendars in one view.
ReclaimAI - Helps users prioritize their work and personal calendars
SyncThemCalendars - Setup a synchronization between calendars
Superhuman - Superhuman is an email management tool.
CalendarBridge - AI email assistant that books meetings by checking your real-time availability across all connected calendars. Just CC it in any email thread.
Shortwave - Email smarter & faster with a reinvented experience for your Gmail