GCD and LCM vs RedEXOS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
GCD and LCM
This app calculates the Greatest Common Divisor (GCD) and Least Common Multiple (LCM) for up to four numbers. It also provides prime factorization and keeps a history of calculations, which can be emailed.
- Calculates GCD/GCF for 2-4 numbers
- Calculates LCM for 2-4 numbers
- Finds prime factorization
- Stores calculation history
- Sends results and history via email
- Supports portrait and landscape modes
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GCD and LCM calculator - calculate the Greatest Common Factor/Greatest Common Divisor and the Least Common Multiple. The app finds the greatest common divisor (GCD)/greatest common factor (GCF) and Least Common Multiple (LCM) of two, three numbers and four numbers. Finds the prime factorization of numbers and shows it in the standard and exponential forms. Just enter two, three or four integers and tap "Calculate". The app lists all factors and identifies the common ones. Keeps calculation history. Sends results and history via email. Supports both portrait and landscape orientation.
RedEXOS
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La Red de detección temprana de Especies Exóticas (REDEXOS) es una herramienta del Gobierno de Canarias para el seguimiento y vigilancia de especies exóticas en el archipiélago. Es un sistema de información que registra los continuos cambios que se están produciendo en nuestro ecosistema, utilizando el concepto de "Ciencia ciudadana".
Screenshots
Verdict
The clearest difference is price: RedEXOS at Free against GCD and LCM's $3.99. RedEXOS also leads on update cadence (every 2 months vs every 19 months). GCD and LCM's advantage is iOS requirement (12.0 vs 15.0). On ads, in-app purchases 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
RedEXOS is free to download; GCD and LCM costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.
GCD and LCM ships an update every 19 months, RedEXOS every 2 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.
| Parameter | GCD and LCM | RedEXOS |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 2.0 (2 ratings) — better | — |
| Positive reviews | 69.2% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 19 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 14 MB | 129 MB |
| Age rating | 4+ | 4+ |
| Developer | Intemodino Group s.r.o. | Gobierno de Canarias |
In-app purchases
GCD and LCM
No in-app purchases
RedEXOS
No in-app purchases
Questions
Is GCD and LCM free?
Is RedEXOS free?
Do GCD and LCM or RedEXOS have ads?
Which is updated more often, GCD and LCM or RedEXOS?
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