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Universal calendar overlay API
Build a software layer that connects Google, Microsoft, and other calendars to provide unified overlay and conflict detection for scheduling apps. The strongest demand is for accurate availability across all connected calendars with minimal setup friction.
Why this matters
You run scheduling across work and personal accounts, sometimes with a shared team calendar layered on top. When your scheduling tool only checks one source well, you end up double-booked or forced to maintain manual exceptions. If you are evaluating software for a team, this becomes a sales blocker because inaccurate availability creates real business loss. You do not just want another booking page; you want a reliable coordination layer that understands every connected calendar and applies conflict rules automatically, without requiring users to think about which provider owns which event.
- · Built for Scheduling SaaS vendors, productivity tool builders, and operations-heavy teams that need accurate availability across multiple calendar providers..
- · Most likely monetization: SaaS subscription.
The Pain · Narrative
You run scheduling across work and personal accounts, sometimes with a shared team calendar layered on top. When your scheduling tool only checks one source well, you end up double-booked or forced to maintain manual exceptions. If you are evaluating software for a team, this becomes a sales blocker because inaccurate availability creates real business loss. You do not just want another booking page; you want a reliable coordination layer that understands every connected calendar and applies conflict rules automatically, without requiring users to think about which provider owns which event.
Score Breakdown
Market Signal
Go-to-Market
Founders and product managers at small scheduling or CRM tools that need enterprise-grade calendar conflict checking without building integrations from scratch.
~10K-30K relevant software teams globally
cold outbound
$99/month
10 product demos booked and 3 pilot integrations started within 30 days
MVP Scope · 1–2 weeks
- Implement OAuth flows for Google and Microsoft calendars
- Create a normalized event schema for free-busy and title metadata
- Build an endpoint that merges busy times from two providers
- Add per-calendar toggle settings for conflict checking
- Set up audit logging for sync errors and token refresh failures
- Add webhook or polling sync to refresh near-real-time availability
- Implement a simple API key system and developer dashboard
- Create privacy controls for hidden versus visible event fields
- Ship a sample widget showing merged availability in a booking flow
- Onboard 2 pilot users and monitor conflict-detection accuracy
Differentiation
Why This Might Fail
Self-rebuttal — the most important trust signal
- 1Calendar overlay may be seen as a commodity feature, making it hard to command standalone pricing unless sold to other software vendors.
- 2Large calendar and scheduling platforms can replicate the core workflow quickly once demand is obvious.
- 3Integration edge cases across enterprise Microsoft environments may consume support resources and delay a polished launch.
Evidence Summary
How AI synthesized this insight — no verbatim quotes
Most of the discussion centers on the need to combine calendars from more than one provider and check conflicts automatically. At least one user explicitly tied the missing feature to not switching from an incumbent product, while another linked it to closing agency customers. That combination of retention and revenue impact suggests meaningful commercial demand.
Action Plan
Validate this opportunity before writing code
Recommended Next Step
Build
Strong demand signals detected. Real pain, real willingness to pay — start building an MVP.
Landing Page Copy Kit
Ready-to-paste copy based on real Reddit community language — no editing required
Headline
Universal calendar overlay API
Sub-headline
Build a software layer that connects Google, Microsoft, and other calendars to provide unified overlay and conflict detection for scheduling apps. The strongest demand is for accurate availability across all connected calendars with minimal setup friction.
Who It's For
For Scheduling SaaS vendors, productivity tool builders, and operations-heavy teams that need accurate availability across multiple calendar providers.
Feature List
✓ Unified OAuth connection flow for major calendar providers ✓ Cross-provider conflict detection and merged availability ✓ Default-on overlay rules with per-calendar toggles ✓ Developer API and webhook support
Where to Validate
Share your landing page in r/GitHub · calcom/cal.com — that's exactly where these pain points were discovered.
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