Comparison

Overlap vs World Population Simulator

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

Head to head
About

Overlap

Easily find optimal meeting times across different time zones with a visual graph. Set custom availability for each location and sync with your calendar to avoid scheduling conflicts. Share convenient times directly from the app.

Highlights
  • Visual Overlap Graph for meeting times
  • Customizable availability hours per time zone
  • Calendar event integration
  • Multiple time zone display
  • Time zone renaming
  • Lock Screen Standby Mode widget
Features
Read full description

Find the perfect time to catchup across multiple time zones without the mind-bending math. Overlap is a smart world clock that helps you connect with people in different time zones. It makes it simple to see the time in multiple places at once, and its fun Overlap Graph is a unique visual way to quickly find convenient meeting times across the world. You can choose ‘available’ hours for each time zone. For example Dan in London might be available from 2pm to 5pm and Rashida in Sydney might be available from 7am to midday. Bring up the Overlap Graph and it will magically show you the most compatible times to schedule your catchup. Overlap also displays your calendar events, so you can always find a time that suits your schedule. Available on iPhone, iPad and Mac. • You can see multiple time zones in one beautiful UI • You can swipe left and right to quickly move through time. • You can customize 'availability' for each timezone - this could mean office hours for a meeting or simply when you're available for a group chat with your far-flung family -no more 'Sorry that's 3am for me!' • You can rename each time zone; for example, you might simply rename a time zone to say 'Grandma' or the name of a client you work with. Or perhaps your Grandma is your client, no judgement here. • You can hide time zones that you don’t need right now so it’s always easy to focus on what you need to know. • You can show your calendar events so you can always choose a time that fits your schedule. • Once you’ve chosen a great time its easy to share it via your favorite messaging app or create a calendar event. • Standby Mode is a Lock Screen feature that activates automatically when your iPhone is charging in landscape mode. The Overlap widget fully supports this mode!

About

World Population Simulator

Explore global population dynamics and country-specific data. This application simulates population growth worldwide and provides comprehensive statistics for over 200 countries, including economic, social, and demographic indicators.

Highlights
  • Population growth simulation
  • Country statistics
  • Economic indicators
  • Social indicators
  • Demographic data
  • Learn about countries
Features
Read full description

This app uses the data from World Bank to simulate the population growth all over the world. When tap on the screen, you can get all kinds of statistics. Moreover, this app introduces every country (data from The World Factbook), and it is a good tool to learn everything of the associated country. ----------------------------------------- Statistics include 215 countries: GDP, GDP per capita, Life expectancy, GDP growth, Population growth, Surface area, Population density; Financial Indicators: Deposit interest rate, Lending interest rate, Tax revenue, Gross domestic savings, Gross national expenditure, Broad money, Education expenditure, Military expenditure, Stocks traded, Listed domestic companies; Social Indicators: GINI index, Unemployment, Literacy rate, Access to electricity, Poverty ratio at national lines, Prevalence of HIV, Rail lines, Hospital beds; Average Indicators: GNI per capita, GDP per capita, Electric consumption per capita, Energy use per capita, CO2 emissions per capita; Population Change: Birth rate, Death rate, Fertility rate, Net migration; Population Composition: Population ≤ 14, Population 15-64, Population ≥ 65, Urban population, Rural population; Land Composition: Forest area, Arable land; Electricity Composition: Nuclear sources, Hydroelectric sources, Oil, gas and coal sources, Renewable sources, excluding hydro; Trade: Trade, Goods and services imports, Goods and services exports; Goods Trade Composition: Food, Fuel, Manufactures, Agricultural raw materials, Ores and metals; Services Trade Composition: Travel services, Transport services, Insurance and financial, Computer and communications.

Screenshots

Overlap4 screens
World Population Simulator3 screens

Verdict

The call

Overlap and World Population Simulator both sit at 4.8 stars, but that hides the real split: 100% of World Population Simulator's written reviews are positive against 67% of Overlap's. Overlap's advantage is ratings volume (873 vs 229). On price, rating, update cadence and ads 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. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Overlap holds the better App Store score, 4.8 against 4.6. Both are backed by a comparable volume of ratings — 873 and 229 respectively. Written reviews complicate that: 67% of Overlap's written reviews are positive against 100% of World Population Simulator's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Overlap ships an update every 3 months, World Population Simulator every 5 months. The most recent releases landed on October 25, 2026 and October 22, 2026 respectively.

Scorecard2 real differences · 8 level
Overlap versus World Population Simulator: the parameters behind the verdict, then further details
ParameterOverlapWorld Population Simulator
PriceFreeFree
Rating4.8 (873 ratings) — better4.6 (229 ratings)
Positive reviews67.3% of reviews100.0% of reviews — better
Number of ratings873 — better229
Update frequencyEvery 3 months — betterEvery 5 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size71 MB27 MB
Age rating4+4+
DeveloperBonobo仕清 刘

Customer experience

Overlap

All ratings849 ratings
Positive95.5%
Neutral2.4%
Negative2.1%
Written reviews248 reviews
Positive67.3%
Neutral11.3%
Negative21.4%

World Population Simulator

All ratings204 ratings
Positive93.1%
Neutral2.5%
Negative4.4%
Written reviews7 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Overlap

Reported bugs

4 issues
  • Timezone data not updating correctly
  • Inability to delete unwanted timezones
  • Inconsistent behavior across platforms
  • Typing issues on Mac version

Requested features

5 requests
  • Add option to reorder timezones
  • Implement 24-hour clock display
  • Allow customization of colors and backgrounds
  • Integrate with calendar for scheduling
  • Add weather information for each timezone

World Population Simulator

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Overlap

No in-app purchases

None

World Population Simulator

No in-app purchases

Questions

Is Overlap free?
Overlap is free to download, with no in-app purchases.
Is World Population Simulator free?
World Population Simulator is free to download, with no in-app purchases.
Which has better reviews, Overlap or World Population Simulator?
Overlap is rated higher. Overlap averages 4.8 out of 5 from 873 ratings, while World Population Simulator averages 4.6 from 229 ratings.
Do Overlap or World Population Simulator have ads?
Neither Overlap nor World Population Simulator shows ads.
Which is updated more often, Overlap or World Population Simulator?
Overlap ships an update every 3 months, and World Population Simulator every 5 months. Most recently, Overlap was updated on October 25, 2026 and World Population Simulator on October 22, 2026.

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