# Calendar app *DeepBlack vs Vaultzi

The clearest difference is in-app purchases: Calendar app *DeepBlack at none against Vaultzi's 3. Calendar app *DeepBlack also leads on iOS requirement (11.0 vs 15.1). Vaultzi's advantage is update cadence (every 2 days vs every 5 months). On price, ads and device support there is nothing between them.

Both are free to download. Vaultzi sells 3 in-app purchases, starting at $6.99 per month. Calendar app *DeepBlack asks for nothing beyond the download.

Calendar app *DeepBlack ships an update every 5 months, Vaultzi every 2 days. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Calendar app *DeepBlack | Vaultzi |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/calendar-app-deepblack/id1115009429/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 days** |
| Monetization | Free | — |
| Size | 10 MB | 57 MB |
| Requires iOS | **11.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Bakerstreet Co., Ltd.](https://appshunter.io/developer/1090599145) | [Sortzi Ltd](https://appshunter.io/developer/1895008545) |

## What reviewers say

### Calendar app *DeepBlack

[App page](https://appshunter.io/ios/app/calendar-app-deepblack/id1115009429)

Organize your schedule with a simple calendar, time, and to-do list. Add tasks and appointments with a touch, and visually distinguish events using customizable color-coding. This app offers a private way to manage your plans without needing to register.

**Highlights:** Daily task and appointment list, Color-coded event decoration, Customizable schedule creation, Private, device-saved plans, Simple touch interface

**Features:** macOS Compatibility

**In-app purchases:** none


### Vaultzi

[App page](https://appshunter.io/ios/app/vaultzi/id6762781868)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Vaultzi Plus Monthly | $6.99 | per month |
| Vaultzi Plus Annual | $29.99 | per year |
| Vaultzi Plus Lifetime | $79.00 | one-time |


## Frequently asked questions

### Is Calendar app *DeepBlack free?

Calendar app *DeepBlack is free to download, with no in-app purchases.

### Is Vaultzi free?

Vaultzi is free to download, with in-app purchases available.

### Do Calendar app *DeepBlack or Vaultzi have ads?

Neither Calendar app *DeepBlack nor Vaultzi shows ads.

### Which is updated more often, Calendar app *DeepBlack or Vaultzi?

Calendar app *DeepBlack ships an update every 5 months, and Vaultzi every 2 days. Most recently, Calendar app *DeepBlack was updated on November 2, 2026 and Vaultzi on October 31, 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.*