Comparison

Baselproblem vs World Explorer Pro

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head

Baselproblem

mathematical analysis

Country Facts & Fun Quizzes

Free

📚 Education

No ratingsView app →

About

Baselproblem

Features

Read full description

The Basel problem is a problem in mathematical analysis with relevance to number theory, first posed by Pietro Mengoli in 1650 and solved by Leonhard Euler in 1734.

About

World Explorer Pro

Features

Read full description

Explore the world from your phone with World Explorer! Whether you're a student, traveler, teacher, or trivia lover, this interactive app is your gateway to learning about every country on Earth. Key Features: Daily Country Highlight – Discover a new featured country each day Smart Browsing – Search and filter by name, capital, region, or language Detailed Country Profiles – Flags, capitals, populations, currencies & more Favorites – Save countries for easy access and personalized learning Interactive Quizzes – Test your knowledge with fun and educational challenges Progress Stats – Track quiz results and explore global stats Beautiful Interface – SwiftUI-powered, clean, and accessible for all users Download World Explorer now and start your journey of global discovery — one country at a time!

Screenshots

Baselproblem1 screens

World Explorer Pro4 screens

Verdict

The call

The clearest difference is in-app purchases: Baselproblem at none against World Explorer Pro's 1. Baselproblem also leads on iOS requirement (15.0 vs 18.2). World Explorer Pro's advantage is update cadence (weekly vs every 11 months). On price, ads and device support 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. World Explorer Pro sells 1 one-off in-app purchase. Baselproblem asks for nothing beyond the download.

UpkeepUpdate frequency

Baselproblem ships an update every 11 months, World Explorer Pro weekly. The most recent releases landed on October 14, 2026 and October 20, 2026 respectively.

Scorecard3 real differences · 3 level

Baselproblem versus World Explorer Pro: the parameters behind the verdict, then further details
Parameter	Baselproblem	World Explorer Pro
Price	Free	Free
Update frequency	Every 11 months	Weekly — better
Ads	No	No
In-app purchases	No — better	Yes
Devices	iPhone, iPad, iPod — better	iPhone, iPad
Requires iOS	15.0 — better	18.2
Further details — not scored
Size	0 MB	9 MB
Age rating	4+	17+
Developer	Andreas Horvath	ChatStick Company Limited

In-app purchases

None

Baselproblem

No in-app purchases

1 purchases

World Explorer Pro

One-time1

Unlock All Feature$0.99

Questions

Is Baselproblem free?

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

Is World Explorer Pro free?

World Explorer Pro is free to download, with in-app purchases available.

Do Baselproblem or World Explorer Pro have ads?

Neither Baselproblem nor World Explorer Pro shows ads.

Which is updated more often, Baselproblem or World Explorer Pro?

Baselproblem ships an update every 11 months, and World Explorer Pro weekly. Most recently, Baselproblem was updated on October 14, 2026 and World Explorer Pro on October 20, 2026.