Countdown Days vs Chromaticity Assistant
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Countdown Days
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.
- Countdown time in years, months, weeks, and days
- Event notification scheduling
- Track time since past events
- Add notes to events
- Categorize events
- Customize themes
Read full descriptionHide full description
Countdown Days is an App that can help you remember events, anniversaries, and big days and send alerts or reminders according to your time setting. You can effortlessly track your time and this App can count down the years, months, weeks, and days for you. Current features: Countdown time (including years, months, weeks, and days) until your events. Schedule notification to remind you days before your events. Track years, months, weeks, and days since the events you created, Write notes on your events. Categorize your events based on your needs. Customize your themes.
Chromaticity Assistant
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.
- 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)
Read full descriptionHide full description
您的掌上色彩管理与辅助分析助手！本软件支持色彩转换器，实现RGB表色系到CMYK、HSV、LAB、HEX表色系的转换；光谱分析，通过380～780可见光波段CSV格式光学图谱，分析计算CIE-1931、CIE-1976 color point x、y、u、v数据；以及色域分析，通过导入Red、Green、Blue Pattern三原色（x、y）坐标csv档案，计算分析DCI-P3、NTSC、sRGB、Adobe RGB色域覆盖率。
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Countdown Days | Chromaticity Assistant |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (26 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 25.0% of reviews | — |
| Number of ratings | 26 — better | 1 |
| Update frequency | Every 8 days — better | Every 5 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone |
| Requires iOS | 12.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 23 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Banghua Zhao | 克俊 张 |
Customer experience
Countdown Days
Chromaticity Assistant
In-app purchases
Countdown Days
- Remove Ads forever$0.99
Chromaticity Assistant
No in-app purchases
Questions
Is Countdown Days free?
Is Chromaticity Assistant free?
Which has better reviews, Countdown Days or Chromaticity Assistant?
Do Countdown Days or Chromaticity Assistant have ads?
Which is updated more often, Countdown Days or Chromaticity Assistant?
Other comparisons
