# VJ Alarm System vs HDCCORE

VJ Alarm System and HDCCORE are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

## The numbers

| Metric | VJ Alarm System | HDCCORE |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/hdccore/id6794347153/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | — |
| Monetization | — | Free |
| Size | 25 MB | 4 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CHANG SHIN VIETNAM COMPANY LTD](https://appshunter.io/developer/1603354571) | [Alvin Maurice](https://appshunter.io/developer/6794347155) |

## What reviewers say

### VJ Alarm System

[App page](https://appshunter.io/ios/app/vj-alarm-system/id1606828145)

**In-app purchases:** none


### HDCCORE

[App page](https://appshunter.io/ios/app/hdccore/id6794347153)

This app visualizes the connection between crude oil prices and energy stock performance. It allows users to track daily market data, measure correlations, and analyze historical trends to understand market relationships.

**Highlights:** Track daily oil and stock prices, Measure correlation (Pearson, R², beta), View stock sensitivity rankings, Compare historical trends with overlay charts, Run price-change scenarios, Record market data and attach screenshots

**In-app purchases:** none


## Frequently asked questions

### Is VJ Alarm System free?

VJ Alarm System is free to download, with no in-app purchases.

### Is HDCCORE free?

HDCCORE is free to download, with no in-app purchases.

### Do VJ Alarm System or HDCCORE have ads?

Neither VJ Alarm System nor HDCCORE shows ads.

---

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