| Metric | K: Event Calendar | Opencals: Appointment Booking |
|---|---|---|
| Rating | 5.0 ★ | 5.0 ★ |
| Total reviews | ★ 25 | 1 |
| Free plan | Yes | Yes |
| Pricing | Free | Free to install |
| Built for Shopify | — | — |
| Pricing tiers | — | 2 tiers |
| Listed features | 5 | 5 |
| Featured placements | 1 | — |
| Languages | 3 supported | 17 supported |
| Listed since | Mar 2026 | Jul 2024 |
K: Event Calendar and Opencals: Appointment Booking are evenly matched on rating (5.0★ vs 5.0★) — the differentiator comes down to pricing fit, feature breadth, and which app's interaction pattern suits your team's workflow.
Pricing entry tiers: K: Event Calendar at Free, Opencals: Appointment Booking at Free to install. Check each app's tier structure for the capacity limits you actually need before deciding — the headline number is the same shape, but the gating shape per tier (seats, usage volume, integrations) varies.
Recommended evaluation path: install both apps' free tiers (where available) and run them in parallel on a small cohort for 7-14 days before committing. The data tables below show the per-feature breakdown — for most merchants the deciding factor will be a single integration or workflow detail that's hard to compare from listing pages alone.
This verdict is generated from the live marketplace data on this page — rating, review count, pricing tier, and category position all refresh from the canonical Shopify App Store listing every 24 hours. AppRanks does not accept payment to influence comparison outcomes; the methodology is documented on the About page and applies identically to every pair on the site.
Read each app's audit: K: Event Calendar audit • Opencals: Appointment Booking audit
| Listed |
|---|
| Last updated | — | — |
|---|
| Keyword | K | Opencals |
|---|---|---|
| appointment | #24 | #24 |
| custom form | #35 | #180 |
| custom forms | #35 | #180 |
| event form | #5 | #237 |
Not featured in any section recently.
Both K: Event Calendar and Opencals: Appointment Booking offer paid plans only. K: Event Calendar starts at Free; Opencals: Appointment Booking starts at Free to install. Compare the per-tier features in the Pricing section above before committing.
K: Event Calendar (5.0★, 25 reviews) and Opencals: Appointment Booking (5.0★, 1 reviews) are essentially tied on rating. Look at review velocity and individual reviewer quotes — both visible on each app's detail page — to differentiate.
AppRanks cannot separate these two on rating — both sit at 5.0★. K: Event Calendar does carry the larger published review base (25 vs 1). Read both apps' detail pages for the feature breakdown and recent listing changes.
Both apps are one-click installs from the Shopify App Store. K: Event Calendar has the deeper published review base (25 vs 1), which often — though not always — accompanies better-tested setup docs. AppRanks doesn't measure setup time directly: read the recent reviews on each app's detail page for user-reported install experience.
K: Event Calendar typically suits early-stage and growth-mode teams based on its published review base (25 reviews). Opencals: Appointment Booking typically suits early-stage and growth-mode teams based on its published review base (1 reviews). A larger review base generally means the app has been exercised at scale — relevant if you are processing high volume or handling enterprise compliance requirements.
Migration support varies by app and category. K: Event Calendar and Opencals: Appointment Booking both publish their export options on their marketplace listing pages (or in their support docs); some apps offer one-click import from competitors, others require CSV. The fastest check: search "import from Opencals: Appointment Booking" in each app's help center. AppRanks does not track migration tooling directly — this is a category-specific capability worth verifying before commitment.