Nylas vs Cronofy vs Google Calendar API 2026
Nylas vs Cronofy vs Google Calendar API 2026
TL;DR
Nylas is the most complete solution when you need both calendar and email sync in a unified API — it reads and writes to Google Calendar, Outlook, Exchange, and iCloud through one interface. Cronofy specializes in scheduling intelligence: real-time availability queries across calendar providers with enterprise-grade privacy controls, making it the best choice for scheduling products, ATS platforms, and B2B SaaS with calendar-as-feature needs. Google Calendar API is free and sufficient if your users are exclusively on Google Workspace, but becomes a liability when you need Microsoft 365 or Exchange support. For B2B products serving enterprise customers with mixed calendar environments, Nylas or Cronofy is worth the cost.
Key Takeaways
- Nylas: Unified API for Gmail, Outlook, Exchange, iCloud, Yahoo; email + calendar + contacts in one SDK; $0 for 5 connected accounts
- Cronofy: Real-time calendar availability across Google, Microsoft, Apple; GDPR-compliant by design; used by major ATS and scheduling vendors
- Google Calendar API: Free; full feature access; Google accounts only; requires per-provider implementation for Outlook/Exchange
- Enterprise calendar reality: 85%+ of Fortune 1000 companies still use Microsoft Exchange or Outlook — Google-only calendar integrations break for these users
- OAuth complexity: All three require provider-specific OAuth flows; Nylas and Cronofy abstract this into a single auth flow
Platform Comparison Matrix
| Nylas | Cronofy | Google Calendar API | |
|---|---|---|---|
| Google Calendar | ✅ | ✅ | ✅ |
| Microsoft Outlook | ✅ | ✅ | ❌ |
| Exchange/EWS | ✅ | ✅ | ❌ |
| Apple iCloud | ✅ | ✅ | ❌ |
| Yahoo Calendar | ✅ | ❌ | ❌ |
| Email sync | ✅ (Gmail + Outlook) | ❌ | Gmail only |
| Free tier | 5 accounts | Limited | Unlimited (Google only) |
| Real-time availability | Basic | ✅ Excellent | Manual |
| Scheduling UI | ✅ Scheduler product | ✅ Scheduler product | ❌ |
| GDPR/SOC 2 | SOC 2 Type II | SOC 2 + GDPR+ | Google ToS |
Nylas: Unified Email + Calendar API
Nylas's core value proposition is a single API that reads and writes to every major email and calendar provider. Instead of building five separate OAuth flows and API integrations (Gmail, Outlook, Exchange, iCloud, Yahoo), you integrate Nylas once and get normalized data across all providers.
What Nylas abstracts
The complexity of calendar and email provider APIs is significant:
- Gmail uses IMAP/SMTP or the Gmail API (Google-specific)
- Outlook.com uses Microsoft Graph API
- Exchange on-premise uses Exchange Web Services (EWS) — a SOAP-based API from 2007
- iCloud uses CalDAV with Apple-specific auth
Nylas handles all of this and returns consistent JSON objects regardless of provider:
import Nylas from 'nylas';
const nylas = new Nylas({ apiKey: 'YOUR_KEY' });
// Same code works for Gmail, Outlook, Exchange, iCloud
const events = await nylas.events.list({
identifier: grantId,
queryParams: {
calendarId: 'primary',
start: Math.floor(Date.now() / 1000),
end: Math.floor(Date.now() / 1000) + (7 * 24 * 60 * 60)
}
});
Nylas Scheduler
Nylas Scheduler is a hosted scheduling page product (similar to Calendly) that you can embed in your app with one line of code. It handles provider auth, availability lookup, conflict detection, and booking confirmation — removing the need to build scheduling UI from scratch.
Nylas Pricing (2026)
| Plan | Connected accounts | Price/month |
|---|---|---|
| Free | 5 | $0 |
| Starter | 25 | $25 |
| Growth | Custom | Custom |
| Enterprise | Custom | Custom |
Beyond the free tier, pricing scales per connected account — important to model before committing if your user base has many calendar connections.
Nylas Limits
- Per-account pricing scales cost quickly for products with thousands of connected users
- Email sync introduces privacy complexity — users are granting broad inbox access
- Exchange on-premise support requires more setup than cloud providers
Cronofy: Real-Time Availability and Scheduling Intelligence
Cronofy's architecture is fundamentally different from Nylas. Rather than syncing all calendar data to their servers, Cronofy queries provider APIs in real-time for availability — preserving event content privacy while answering the core scheduling question: "when is this user free?"
Why availability-first matters
For scheduling products, the key query isn't "show me all calendar events" — it's "find a time when User A and User B are both free for 30 minutes next week." Cronofy's Availability API is purpose-built for this:
const availability = await cronofy.availability({
participants: [
{
members: [
{ sub: 'acc_user1_id', managed_availability: true },
{ sub: 'acc_user2_id', managed_availability: true }
],
required: 'all'
}
],
required_duration: { minutes: 30 },
available_periods: [
{
start: '2026-04-15T09:00:00Z',
end: '2026-04-15T17:00:00Z'
}
]
});
This query fans out to each participant's calendar provider in real-time and returns only the intersection of free slots — event details never leave the provider.
Enterprise scheduling use cases
Cronofy is used heavily in:
- ATS (Applicant Tracking Systems): Interview scheduling across large enterprise organizations with Outlook/Exchange calendars
- Healthcare: Appointment booking across provider schedules
- Professional services: Client meeting scheduling at law firms, consulting firms, financial advisors
These use cases require Cronofy's compliance posture — GDPR data processing agreements, no calendar content stored on Cronofy servers by default, and enterprise security reviews available.
Cronofy Pricing (2026)
Cronofy pricing is quote-based for production use. They offer:
- Free developer tier for testing (limited accounts and API calls)
- Startup plans starting around $99/month
- Enterprise contracts for high-volume scheduling products
Cronofy Limits
- No email sync — calendar only
- Pricing is opaque; requires a sales conversation for production volumes
- Less suitable for consumer apps (better for B2B SaaS and enterprise platforms)
Google Calendar API: Free but Google-Only
If your users exclusively use Google Workspace or personal Google accounts, the Google Calendar API is a legitimate choice — it's free, full-featured, and well-documented.
What you get
- Full CRUD on calendar events
- Free/busy queries for scheduling
- Calendar sharing and resource management
- Push notifications for calendar changes (via webhooks)
- No per-API-call charges
The enterprise problem
The hard limit is provider coverage. Google Calendar API only talks to Google Calendar. In enterprise B2B contexts:
- Microsoft Exchange/Outlook dominates corporate IT deployments
- Large companies rarely run exclusively on Google Workspace
- Users on Outlook need a separate Microsoft Graph API integration
Building multi-provider calendar support yourself means maintaining two OAuth flows, two event data models, two webhook implementations, and handling provider-specific quirks (Exchange's meeting request model, Outlook's recurring event exceptions, etc.). This is exactly the complexity Nylas and Cronofy exist to abstract.
When to use Google Calendar API directly
- Consumer apps targeting personal Gmail users
- Google Workspace-only B2B where you've confirmed customers are 100% Google
- Internal tools for companies running on Google Workspace
- Cost-sensitive projects where the additional provider coverage of Nylas/Cronofy can't be justified yet
Feature Comparison: Scheduling-Specific
| Feature | Nylas | Cronofy | Google Calendar API |
|---|---|---|---|
| Multi-provider availability | ✅ | ✅ (best-in-class) | ❌ |
| Real-time availability query | Basic | ✅ Excellent | Manual/polling |
| Hosted scheduling page | ✅ Scheduler | ✅ Elements | ❌ |
| Calendar event CRUD | ✅ | ✅ | ✅ |
| Email sync | ✅ Gmail + Outlook | ❌ | Gmail only |
| Push notifications/webhooks | ✅ | ✅ | ✅ (Google only) |
| Conference link creation | ✅ (Zoom, Meet) | ✅ | Google Meet only |
| Buffer times / working hours | Via Scheduler | ✅ Native | Manual |
| Event metadata/custom fields | ✅ | Limited | ✅ |
Use Case Decision Guide
| Use case | Best choice |
|---|---|
| B2B SaaS scheduling feature | Nylas or Cronofy |
| Consumer app, Google users only | Google Calendar API |
| ATS/interview scheduling | Cronofy |
| Email + calendar sync required | Nylas |
| Healthcare appointment booking | Cronofy |
| Internal Google Workspace tool | Google Calendar API |
| Multi-provider calendar CRUD | Nylas |
| Privacy-preserving availability | Cronofy |
| Embedded scheduling widget | Nylas Scheduler or Cronofy Elements |
Pricing at 1,000 Connected Users
| Platform | Estimated monthly cost |
|---|---|
| Nylas | ~$500–2,000 (per-account model) |
| Cronofy | Custom quote (~$300–800 estimated) |
| Google Calendar API | $0 (Google users only) |
For a B2B product with 1,000 connected user calendars, Nylas and Cronofy costs are material. Model this against your ARPU before choosing.
Which Calendar API Should You Use?
Choose Nylas if you need both email and calendar sync, your users span Google and Microsoft, and you want a single API surface covering all major providers. The Scheduler product is a bonus if you want to offer Calendly-like scheduling without building it yourself.
Choose Cronofy if your primary use case is scheduling and availability — especially in enterprise B2B, healthcare, or ATS contexts where calendar content privacy is a compliance concern. The real-time availability model is architecturally superior to Nylas for pure scheduling.
Choose Google Calendar API if your users are exclusively Google Workspace or you're building an internal tool. The zero-cost access is hard to beat for Google-only deployments.