Comparison

Ciudadanos Científicos vs Combinatorics Calculator

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

Head to head
About

Ciudadanos Científicos

Features
Read full description

Ciudadanos Científicos es un proyecto local de ciencia, educación y tecnología, desarrollado por el Sistema de Alerta Temprana de Medellín y el Valle de Aburrá SIATA y financiado por el Área Metropolitana del Valle de Aburrá. El proyecto se encuentra en vigencia desde el año 2015, cuando algunos ciudadanos del Área Metropolitana decidieron, de manera voluntaria, tener en sus hogares o lugares de trabajo una "nube", es decir, un sensor de medición del aire de bajo costo que permite obtener mediciones puntuales, minuto a minuto, de la temperatura, humedad y PM 2.5. Contar con una red de esta naturaleza ha permitido enriquecer investigaciones que soportan decisiones, por ejemplo las tomadas durante las alertas naranja y roja por episodios críticos de calidad del aire, la construcción de políticas, y además, ha despertado la conciencia de los ciudadanos en su papel y responsabilidad para contribuir al cuidado y mejoramiento de la calidad del aire en la región.

About

Combinatorics Calculator

Features
Read full description

Finish your homework instantly. Prepare for exams without stress. Free, complete step-by-step solutions. Enter your values and calculate permutations, combinations, and variations – with and without repetition. HOW IT WORKS Enter your values in the correct fields and get started. You’ll receive the solution instantly and can share it with friends or classmates. YOUR PERSONAL DATA We don’t need it. Only anonymized data is collected, for example: - which features are used - how many solutions are generated This helps us improve. We cannot identify you. COSTS Everything is free to use. 24/7 access to your solutions. All solution steps are always complete. If you need many solutions in a short time, additional purchase options are available. EXTRAS - curated learning videos - feedback on incorrect inputs - manage your own solutions - app introduction CONTACT Questions or feedback via Discord or directly in the app review.

Screenshots

Ciudadanos Científicos4 screens
Combinatorics Calculator4 screens

Verdict

The call

The clearest difference is in-app purchases: Ciudadanos Científicos at none against Combinatorics Calculator's 8. Ciudadanos Científicos also leads on iOS requirement (9.3 vs 15.0). Combinatorics Calculator's advantage is update cadence (every 3 weeks vs every 3 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. Combinatorics Calculator sells 8 one-off in-app purchases. Ciudadanos Científicos asks for nothing beyond the download.

UpkeepUpdate frequency

Ciudadanos Científicos ships an update every 3 months, Combinatorics Calculator every 3 weeks. The most recent releases landed on October 5, 2026 and October 24, 2026 respectively.

Scorecard3 real differences · 3 level
Ciudadanos Científicos versus Combinatorics Calculator: the parameters behind the verdict, then further details
ParameterCiudadanos CientíficosCombinatorics Calculator
PriceFreeFree
Update frequencyEvery 3 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS9.3 — better15.0
Further details — not scored
Size44 MB180 MB
Age rating4+4+
DeveloperArea Metropolitana del Valle de AburraGlindemann, Sennoun, Langer GbR

In-app purchases

None

Ciudadanos Científicos

No in-app purchases

8 purchases

Combinatorics Calculator

One-time8
  • +30 User Tokens$0.29
  • +1 Convenience Token / 6h, max. +2$0.59
  • +2 Convenience Tokens / 6h, max. +4$0.99
Show 5 more
  • +150 User Tokens$0.99
  • +300 User Tokens$1.49
  • +4 Convenience Tokens / 6h, max. +8$1.59
  • Lifetime Access$1.99
  • Remove Ads$1.99

Questions

Is Ciudadanos Científicos free?
Ciudadanos Científicos is free to download, with no in-app purchases.
Is Combinatorics Calculator free?
Combinatorics Calculator is free to download, with in-app purchases available.
Do Ciudadanos Científicos or Combinatorics Calculator have ads?
Neither Ciudadanos Científicos nor Combinatorics Calculator shows ads.
Which is updated more often, Ciudadanos Científicos or Combinatorics Calculator?
Ciudadanos Científicos ships an update every 3 months, and Combinatorics Calculator every 3 weeks. Most recently, Ciudadanos Científicos was updated on October 5, 2026 and Combinatorics Calculator on October 24, 2026.

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