Tung Vu

Productivity is the main category at about 44.4% of apps, while the portfolio spans 5 categories. This is a relatively diversified portfolio strategy.

Productivity

4 apps · 44.4%

Utilities

2 apps · 22.2%

Games

1 apps · 11.1%

Music

1 apps · 11.1%

Health & Fitness

1 apps · 11.1%

• The primary category Productivity accounts for 44.4%. Long-tail categories can reduce single-category risk.
• The diversification score is about 0.72 (0=highly concentrated, 1=highly diversified), useful for comparing developers.

The full portfolio has about 1.8K public ratings, a small public review base. It includes 8 free apps and 1 paid apps.

Apps

9

Total ratings

1.8K

Free / paid

8 / 1

• By review volume, the leading apps include: "Just Write - App For Writer", "Jumping Guns", "Thiền Đương Đại".
• Free apps dominate, which often points to a utility entry point plus subscription or upgrade model.

Weighted by rating volume, the portfolio averages about 4.30 stars; the simple average is 4.42 stars. The gap shows whether high-volume apps lift or drag the overall reputation.

Weighted avg

4.30 ★

Simple avg

4.42 ★

• The weighted and simple averages are close, suggesting reputation is relatively balanced across apps.
• 2 apps have no public rating data, so long-tail performance is underrepresented.

The iTunes Search API does not provide review text. This card uses low star ratings with enough review volume as a proxy, and separately highlights apps with thin samples.

• No app triggered the low-rating plus sufficient-sample threshold.
• Thin rating samples (under 50 ratings): "Activity Jot", "Amazing Calculator", "Time Mark - Track and Insights". Star ratings can swing heavily until more feedback arrives.

The earliest listed app is "Time Mark - Track and Insights", while the newest or most recent listing signal is "Activity Jot". The span is a proxy for long-term iteration capacity.

Span

10 years+

• Earliest record in this dataset: 2014 (Time Mark - Track and Insights).
• Newer app signal: 2025 (Activity Jot).

These takeaways are based on public metadata and are useful for competitor research or portfolio planning. Deeper conclusions require downloads, revenue, and review text.

• Study the category mix: 5 categories show whether a main-category plus extension structure matches your resources.
• Compare reputation structure: weighted 4.30 stars vs. the leading app "Just Write - App For Writer" and its review volume.
• For similar tools, prioritize review mining on lower-rated apps to find functional gaps; this requires store reviews or third-party data.