# Grid Calendar+ vs Core 3D Viewer

The clearest difference is device support: Grid Calendar+ at 3 against Core 3D Viewer's 1. Grid Calendar+ also leads on iOS requirement (15.6 vs 17.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Grid Calendar+ sells 1 in-app purchase, starting at $1.99 per month and Core 3D Viewer sells 3 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

Grid Calendar+ ships an update every 8 days, Core 3D Viewer every 6 days. The most recent releases landed on October 17, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Grid Calendar+ | Core 3D Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 37.9% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 8 days | **Every 6 days** |
| Monetization | Free with in-app purchases | — |
| Size | 1 MB | 41 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [y-design](https://appshunter.io/developer/398188218) | [Oleksandr Neskoromiuk](https://appshunter.io/developer/6804250160) |

## What reviewers say

### Grid Calendar+

[App page](https://appshunter.io/ios/app/grid-calendar-plus/id6751937640)

This app offers a visual way to manage multiple overlapping schedules, perfect for balancing work, school, and personal life. Easily add events with icons and emojis, and sync your data across devices. Integrate with existing calendars for seamless organization.

**Highlights:** Multiple schedule visualization, Event management with icons/emojis, Automatic iCloud sync, iOS Calendar integration, Google Calendar integration, Group schedule sharing

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month Unlimited | $1.99 | per month |


### Core 3D Viewer

[App page](https://appshunter.io/ios/app/core-3d-viewer/id6804250158)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $5.99 | per month |
| Pro Yearly | $39.99 | per year |
| Pro Lifetime | $99.99 | one-time |


## Frequently asked questions

### Is Grid Calendar+ free?

Grid Calendar+ is free to download, with in-app purchases available.

### Is Core 3D Viewer free?

Core 3D Viewer is free to download, with in-app purchases available.

### Do Grid Calendar+ or Core 3D Viewer have ads?

Neither Grid Calendar+ nor Core 3D Viewer shows ads.

### Which is updated more often, Grid Calendar+ or Core 3D Viewer?

Grid Calendar+ ships an update every 8 days, and Core 3D Viewer every 6 days. Most recently, Grid Calendar+ was updated on October 17, 2026 and Core 3D Viewer on October 16, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*