# Calendar app *DeepBlack vs One Source X

The clearest difference is rating: One Source X at 5.0 against Calendar app *DeepBlack's 4.5. Calendar app *DeepBlack's advantage is iOS requirement (11.0 vs 16.6). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

One Source X holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 2 and 2 respectively.

Calendar app *DeepBlack ships an update every 5 months, One Source X every 3 months. The most recent releases landed on October 12, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Calendar app *DeepBlack | One Source X |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (2 ratings)](https://appshunter.io/ios/app/calendar-app-deepblack/id1115009429/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/one-source-x/id6467622640/reviews)** |
| Number of ratings | 2 | 2 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 10 MB | 312 MB |
| Requires iOS | **11.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Bakerstreet Co., Ltd.](https://appshunter.io/developer/1090599145) | [One Source Branding & Media LLC](https://appshunter.io/developer/1708869345) |

## 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


### One Source X

[App page](https://appshunter.io/ios/app/one-source-x/id6467622640)

This app offers an all-in-one platform for business communication and lead management. It streamlines operations from lead capture and nurturing to engagement and payment collection. Optimize your business potential with a unified toolset.

**Highlights:** Lead capture (landing pages, forms, inbound calling), AI Bot and pipeline management, Multi-channel messaging (voicemail, SMS, email, FB Messenger), Payment collection, Appointment setting, Performance analytics

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is Calendar app *DeepBlack free?

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

### Is One Source X free?

One Source X is free to download, with no in-app purchases.

### Which has better reviews, Calendar app *DeepBlack or One Source X?

One Source X is rated higher. Calendar app *DeepBlack averages 4.5 out of 5 from 2 ratings, while One Source X averages 5.0 from 2 ratings.

### Do Calendar app *DeepBlack or One Source X have ads?

Neither Calendar app *DeepBlack nor One Source X shows ads.

### Which is updated more often, Calendar app *DeepBlack or One Source X?

Calendar app *DeepBlack ships an update every 5 months, and One Source X every 3 months. Most recently, Calendar app *DeepBlack was updated on October 12, 2026 and One Source X on October 9, 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.*