Stop Shipping Broken
Calendar Invites,
Forever.
Synara guarantees every attendee sees the correct version of an event.
Across Google, Outlook, Apple. No divergence, ever.
ICS Generation & Delivery Engine
Any Calendar
Google, Outlook, Apple, etc
Instant Sync for
Updated Events
Automatic Update Handling
Update Queue
Event State Stored
& Tracked
Webhook
Executing...
47%
Drift Prevention
+78%
Why Use Synara?
Modern Apps Need More Than ICS
Legacy ICS files were never designed for modern apps.
Synara replaces unpredictable behaviour with a clean, consistent event system developers can actually rely on.
ICS Inconsistency
Different Providers, Different Interpretations
25-year-old formats get parsed differently by Google, Microsoft and Apple.
Updates ignored or misinterpreted
Attendees seeing different versions of the same event
RSVP behaviour that changes depending on the client
Recurring rules handled inconsistently
Timezone drift and date shifting
Updates
Changes Don’t Actually Sync Reliably
Most apps assume “send another ICS with METHOD:UPDATE” is enough. When, in reality:
Google may create a duplicate event
Outlook may drop the update entirely
Attendees can’t tell what changed
Clients apply partial updates or ignore them
The Solution
One Format, One API, Consistent Results
Synara uses a new JSON format called ACE (Active Calendar Events) to normalise event data, delivering reliable invites and updates everywhere, without custom logic for each calendar provider.
Events behave predictably across Google and Microsoft
Updates sync cleanly without provider-specific handling
Legacy clients stay compatible through automatic ICS fallback
Synara is the single source of truth that keeps events consistent across providers.
Quotes
What developers are saying about Synara
Real feedback from early adopters across Product Hunt, Reddit, and the dev community.
“Calendars and ICS files do suck. It’s a worthy problem to solve, especially when different providers don’t play well together.”
- Reddit Developer
“I see the problem it solves now. I can imagine it being useful in ops, logistics, sales and events — anywhere with diverse client devices. ICS must be hell in those situations.”
- Reddit Developer
“ICS inconsistencies have burned me too many times. A clean API that handles Google, Outlook and Apple differences automatically is a huge relief.”
- Mike Payne, Developer
Highlights
Calendar-Safe Event Invites
Synara handles the ugly calendar edge cases so you don’t have to: invites, updates, cancellations, and RSVPs that stay in sync across Google, Outlook, and Apple.
Reliable Event Delivery
A single API call that produces correct, cross-calendar-safe invites — no rendering bugs, no duplicates, no ghost events.
Update Handling Done Right
Synara issues the correct update/cancellation so every attendee’s calendar stays aligned.
Full Visibility for Developers
Track delivery, RSVPs, and sync state in real time with logs and webhooks.
The Process
How Synara Sits Between Your App and Calendars
Your product stays the source of truth. Synara turns your events into calendar-safe invites, updates, and cancellations, and streams the results back to you.
Your App Triggers Synara
Any time you create or change an event, Synara takes over the calendar work.
/events
Synara Normalises & Decides
We validate your event, apply calendar rules, and choose whether to send an invite, update, or cancel.
Calendars Stay in Sync
Attendees see one correct version of the event in every calendar.
You Stay in Control
Use Synara’s tools to intervene, debug, or replay behaviour when you need to.
Why Teams Use Synara
The Benefits of Calendar Stability
Synara removes the hidden risks that break events across Google, Outlook, Apple, and anything else your attendees use, so your product behaves predictably in the real world.
Stop Wasting Time on Bugs
No more reverse-engineering ICS behaviour or reproducing Outlook quirks. Synara handles the messy bits for you.
Fewer Errors Reaching Attendees
Synara guarantees consistency between the data you send and the calendar entries attendees receive.
Understand What Really Happened
Every invite, update, RSVP, and cancellation is logged with a full audit trail.
Drop-In Integration
Add Synara without rebuilding your event model — just send your event data and Synara does the rest.
Developer Integration
Built for Your Existing Stack
Synara integrates at the developer level — via API, SDKs, email parsing, and webhooks — so you can add reliable event delivery without rebuilding your product.
REST API
Create, update, cancel, and monitor events using a clean, predictable REST interface. No calendar-specific quirks to manage on your end.
SDK
PHP
A typed, framework-agnostic SDK designed for Laravel, Symfony, and custom PHP apps. Handles signing, validation, and event formatting automatically.
JavaScript
Drop Synara into Node, Next.js, Remix, or any JS backend with minimal config. Perfect for SaaS dashboards, internal tools, and event-driven apps.
Who It's For
Made for Developers Who Own the Event Experience
Synara is for products that send real calendar invites to real attendees – and can’t afford broken .ics files, duplicate events, or missed updates.
Product & Engineering Teams
Sending calendar invites from your SaaS? Synara handles delivery that works in Google, Outlook, and Apple.
Event Platforms
Webinars, cohorts, conferences — every attendee sees the same event — even when details change.
Internal Scheduling Tools
Already shipping .ics and drowning in “my calendar looks wrong”? Synara fixes the edge cases so you can focus on your product.
Teams Replacing DIY ICS
You already ship .ics files today, but support is drowning in “my calendar looks wrong” tickets. You want to stop debugging edge cases across Google, Outlook, and Apple.
Join the First Wave of Synara Builders
We’re working closely with a small set of teams who depend on accurate calendar invites.
Direct help with integration
Influence over upcoming features
Locked-in early pricing
Safe test environment
Pricing Plans
Flexible Pricing for Every Need
Start for free, upgrade anytime. Save 20% with yearly billing!
Free
$ 0 / Month
For testing, prototypes, and early product validation.
Features
Basic
$ 19 / Month
Individuals & small projects
Features
Pro
$ 49 / Month
Freelancers & small businesses
Features
Stay in the loop
Get early access to Synara
Building a product that sends calendar invites?
Share your email we’ll reach out when Synara is ready for you.
Synara is calendar delivery infrastructure for products that can’t afford broken invites. One API to keep every attendee in sync across Google, Outlook, Apple and more.
