Simply Schedule Appointments (SSA) and CalNative Booking are both WordPress booking plugins that connect to Google Calendar. If you are comparing the two, you are likely a solo practitioner or small business owner who wants booking embedded on their WordPress site without redirecting clients to a third-party platform.
Both plugins solve that problem. They differ in how the Google Calendar connection works, what the free and paid tiers include, and which type of business each one is best suited to. This article covers those differences honestly.
How Simply Schedule Appointments connects to Google Calendar
Simply Schedule Appointments uses OAuth to connect to Google Calendar. You authorise SSA to access your Google account through the standard Google permission flow, and SSA uses that authorisation to read your calendar’s busy times and write new events when bookings are confirmed.
SSA maintains its own availability database — it tracks appointment types, working hours, and booked slots internally. Google Calendar is used to check for additional conflicts and to create events when bookings are made, but SSA’s own data is the primary source of what is available.
The OAuth connection has a limited lifespan. Google access tokens expire, and if the connection is not refreshed, SSA can lose access to the calendar. In practice this is usually handled automatically, but it is a maintenance surface that does not exist with a service account approach.
How CalNative Booking connects to Google Calendar
CalNative Booking uses a Google service account — a server-to-server credential that you create once in Google Cloud Console and upload to the plugin as a JSON key file. There is no OAuth flow, no login button, and no token that expires. The credential is permanent until you deliberately revoke it.
CalNative does not maintain its own availability database. Every time a visitor opens the booking page, the plugin queries your Google Calendar’s free/busy data directly from the API. The calendar is the single source of truth. If you blocked time in Google Calendar five minutes ago, that time is unavailable in the booking widget now — not after the next sync.
Free plan comparison
Simply Schedule Appointments has a genuinely useful free plan. It supports one appointment type, Google Calendar sync, basic email notifications, and unlimited bookings. For a business with a single appointment type and no need for advanced features, the free plan is a workable long-term option.
CalNative Booking does not have a free plan. It is $39/year from the start. The trade-off is that the $39 plan includes everything — real-time Google Calendar reads via service account, full email customisation with tokens, ICS attachments, cancellation links, appearance controls, and the booking admin panel. There are no tiers that lock features behind a higher price.
Paid plan comparison
Simply Schedule Appointments’ paid plans start at $99/year for the Plus plan, which adds payment collection, custom fields, group appointments, and Zoom integration. The Professional plan at $199/year adds team scheduling, round-robin booking, and priority support.
For a solo practitioner who does not need payments at booking, team scheduling, or Zoom integration, the SSA Plus plan adds features that will not be used. The price gap between SSA Plus ($99) and CalNative ($39) reflects that scope difference.
Feature comparison
| Feature | Simply Schedule Appointments | CalNative Booking |
|---|---|---|
| Google Calendar connection | OAuth sync | Service account API |
| Availability source | SSA database + GCal sync | Google Calendar only — real time |
| Connection expires | Yes — OAuth tokens | Never — service account |
| Free plan | ✓ — 1 appointment type | ✗ |
| Multiple appointment types | ✓ (paid) | ✓ (included) |
| Payment at booking | ✓ (paid) | ✗ |
| Team / multi-staff | ✓ (paid) | ✗ |
| Custom intake fields | ✓ (paid) | Notes field |
| Zoom integration | ✓ (paid) | ✗ |
| ICS attachment in emails | ✓ | ✓ |
| Self-cancellation link | ✓ | ✓ |
| Custom styling / CSS | Limited | ✓ — colour, radius, CSS |
| Booking stays on your domain | ✓ | ✓ |
| Starting price | Free / $99/yr | $39/yr |
Where Simply Schedule Appointments is the stronger choice
SSA is the better option in several situations:
- You want to start for free. If you are not yet sure whether online booking will work for your business, SSA’s free plan lets you test it without any upfront cost.
- You need payment at booking. SSA Plus supports Stripe and PayPal. CalNative does not take payments.
- You need team scheduling. SSA Professional supports multiple team members each with their own availability. CalNative is a single-host plugin.
- You need Zoom links generated automatically. SSA’s Zoom integration creates a meeting link for each booking and includes it in the confirmation email. CalNative does not have this feature.
- You need custom intake fields. If you want to ask specific questions at booking beyond a single notes field, SSA’s custom fields are more flexible.
Where CalNative Booking is the stronger choice
CalNative is the better option when the Google Calendar connection and simplicity are the priorities:
- You want real-time availability from Google Calendar. CalNative reads free/busy data on demand. SSA reads from its own database with Google Calendar as a sync layer. If your calendar changes frequently and accuracy matters, the difference is meaningful.
- You do not want an OAuth connection to maintain. Service account credentials do not expire. There is no reconnection work, no token refresh to monitor, no risk of the calendar check silently breaking.
- You want full styling control without CSS overrides. CalNative’s appearance settings cover colour, border radius, max width, and custom CSS as standard. SSA’s styling options are more limited without additional overrides.
- All features at the lowest price point. At $39/year, CalNative costs less than SSA’s Plus plan and includes everything it offers for a solo practitioner — with no features held back for higher tiers.
Which one should you choose?
Choose Simply Schedule Appointments if you want to start for free and test online booking before committing, need payment collection or Zoom integration, have multiple staff members to schedule, or require custom intake forms with specific field types.
Choose CalNative Booking if you are a solo practitioner who uses Google Calendar as your primary diary, want the booking widget to read availability directly from the API in real time, prefer a maintenance-free connection that never expires, and want full styling control at the lowest annual price.
The core difference between the two is architectural: SSA manages its own availability data and syncs with Google Calendar; CalNative treats Google Calendar as the only source of truth. For businesses where calendar accuracy matters and simplicity is valued over feature breadth, that distinction is the deciding factor.
