Comparison

GCD and LCM vs Study Focus Timer

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

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

Study Focus Timer

This app helps you stay focused during study sessions using customizable timers. It supports the Pomodoro technique and allows for easy arrangement and visual tracking of your work and break intervals. Optimize your learning with flexible timer combinations.

Highlights
  • Pomodoro study timer
  • Successive timer settings
  • Interval timer customization
  • Easy timer rearrangement
  • Visual elapsed time gauge
  • List of current study sets
Features
Read full description

●Pomodoro study timer ・You can set successive timers. ・You can set interval timers. ●Example of timers Pomodoro technique for studying: 25 min studying - 5 min rest - 25 min studying - 5 min rest - 25 min studying - 5 min rest - 25 min studying - 5 min rest - 30 min rest = Various timer combinations are possible!! So, you can use Studying timer for a variety of continuous tasks including for pomodoro technique!! ●Easy to rearrange the pomodoro timers ・You can make interval at once for pomodoro technique. ・You can sort study timers by dragging ・You can delete study timers by slide sideways ●Easy to understand visually ・You can find elapsed time on the gauge. ・You can find the current study set on the list. ●Pomodoro technique Pomodoro technique is a method of repeatedly dividing one task into smaller pieces, finishing each divided task in a short time, and then taking a break. Pomodoro Technique is said to be useful for studying. Studying timer is one of the best Pomodoro timers for studying. If you are looking for a recommended Pomodoro timer, please try this timer app!!! -- ・Terms of service https://japy.jp/2022/03/service-term-en.html ・Privacy policy https://japy.jp/2022/03/Privacy-Policy-en.html

Screenshots

GCD and LCM3 screens
Study Focus Timer2 screens

Verdict

The call

The clearest difference is price: Study Focus Timer at Free against GCD and LCM's $3.99. Study Focus Timer also leads on review sentiment (100% vs 69%) and update cadence (fortnightly vs every 19 months). GCD and LCM's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support and iOS requirement 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

Study Focus Timer is free to download; GCD and LCM costs $3.99 up front. Study Focus Timer sells 1 in-app purchase, starting at $0.99 per month. GCD and LCM asks for nothing beyond the download.

UpkeepUpdate frequency

GCD and LCM ships an update every 19 months, Study Focus Timer fortnightly. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

Scorecard6 real differences · 4 level
GCD and LCM versus Study Focus Timer: the parameters behind the verdict, then further details
ParameterGCD and LCMStudy Focus Timer
Price$3.99Free — better
Rating2.0 (2 ratings) — better—
Positive reviews69.2% of reviews100.0% of reviews — better
Number of ratings2 — better—
Update frequencyEvery 19 monthsFortnightly — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad, iPod
Requires iOS12.011.0 — better
Further details — not scored
Size14 MB44 MB
Age rating4+4+
DeveloperIntemodino Group s.r.o.Foodmenu.world Inc.

Customer experience

GCD and LCM

All ratings2 ratings
Positive0.0%
Neutral50.0%
Negative50.0%
Written reviews13 reviews
Positive69.2%
Neutral7.7%
Negative23.1%

Study Focus Timer

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

GCD and LCM

No in-app purchases

1 purchases

Study Focus Timer

Subscriptions1
  • Premium$0.991 Month

Questions

Is GCD and LCM free?
GCD and LCM costs $3.99, with no in-app purchases.
Is Study Focus Timer free?
Study Focus Timer is free to download, with in-app purchases available.
Do GCD and LCM or Study Focus Timer have ads?
Study Focus Timer shows ads; GCD and LCM does not.
Which is updated more often, GCD and LCM or Study Focus Timer?
GCD and LCM ships an update every 19 months, and Study Focus Timer fortnightly. Most recently, GCD and LCM was updated on November 1, 2026 and Study Focus Timer on November 3, 2026.

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