# Countdown Days vs Chromaticity Assistant

The clearest difference is in-app purchases: Chromaticity Assistant at none against Countdown Days's 1. Chromaticity Assistant also leads on ads (none vs shown). Countdown Days's advantage is update cadence (every 8 days vs every 5 months) and ratings volume (26 vs 1). On price and rating there is nothing between them.

Both are free to download. Countdown Days sells 1 one-off in-app purchase. Chromaticity Assistant asks for nothing beyond the download.

Chromaticity Assistant holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Countdown Days has 26 ratings behind it against 1, so its average is the more settled of the two.

Countdown Days ships an update every 8 days, Chromaticity Assistant every 5 months. The most recent releases landed on September 22, 2026 and August 23, 2026 respectively.

## The numbers

| Metric | Countdown Days | Chromaticity Assistant |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (26 ratings)](https://appshunter.io/ios/app/countdown-daysday-counter-app/id1525084657/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/chromaticity-assistant/id6504816355/reviews)** |
| Number of ratings | **26** | 1 |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 8 days** | Every 5 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 23 MB | 3 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Banghua Zhao](https://appshunter.io/developer/1288052561) | [克俊 张](https://appshunter.io/developer/1168250350) |

## What reviewers say

### Countdown Days

[App page](https://appshunter.io/ios/app/countdown-daysday-counter-app/id1525084657)

Easily track important dates like birthdays and anniversaries. Get timely reminders and count down the time remaining until your events. Organize events with notes and custom categories.

**Highlights:** Countdown time in years, months, weeks, and days, Event notification scheduling, Track time since past events, Add notes to events, Categorize events, Customize themes

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads forever | $0.99 | one-time |


### Chromaticity Assistant

[App page](https://appshunter.io/ios/app/chromaticity-assistant/id6504816355)

This app provides color management and analysis tools. It supports color space conversion, spectral analysis of visible light, and color gamut analysis for various standards.

**Highlights:** Color space conversion (RGB, CMYK, HSV, LAB, HEX), Spectral analysis (CIE-1931, CIE-1976), Color gamut analysis (DCI-P3, NTSC, sRGB, Adobe RGB), Import optical spectrum data (CSV), Import primary color coordinates (CSV)

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

**In-app purchases:** none


## Frequently asked questions

### Is Countdown Days free?

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

### Is Chromaticity Assistant free?

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

### Which has better reviews, Countdown Days or Chromaticity Assistant?

Chromaticity Assistant is rated higher. Countdown Days averages 4.8 out of 5 from 26 ratings, while Chromaticity Assistant averages 5.0 from 1 ratings.

### Do Countdown Days or Chromaticity Assistant have ads?

Countdown Days shows ads; Chromaticity Assistant does not.

### Which is updated more often, Countdown Days or Chromaticity Assistant?

Countdown Days ships an update every 8 days, and Chromaticity Assistant every 5 months. Most recently, Countdown Days was updated on September 22, 2026 and Chromaticity Assistant on August 23, 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.*