Comparison

gMath vs i

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

Head to head
About

gMath

Explore interactive math applets created by educators to deepen understanding of mathematical concepts. This collection offers bilingual content and is freely available for students and teachers. Additional resources and updates are provided online.

Highlights
  • Interactive math applets
  • Bilingual content (English/Traditional Chinese)
  • Designed by teachers
  • Free for students and teachers
  • Online resources and updates
Features
Read full description

This app is a collection of GeoGebra applets designed by teachers of The Church of Christ In China Tam Lee Lai Fun Memorial Secondary School (δΈ­θ―εŸΊη£ζ•™ζœƒθ­šζŽιΊ—θŠ¬η΄€εΏ΅δΈ­ε­Έ) located in Hong Kong. It aims to help students to learn Mathematics in an interactive way and develop a deeper understanding of the subject. These applets are deliverable results of an ongoing project funded by the Quality Education Fund of Hong Kong SAR Government. This app can be freely used by teachers and students. Relevant worksheets and teaching ideas are available on the project website www.gmath.hk. Unauthorised commercial use is prohibited. All applets in this app are available bilingually (English and Traditional Chinese). Internet connection is needed to load the applets, which will be continually updated, added and rearranged. Please visit our Facebook page (www.facebook.com/hkgeogebra) for updates. GeoGebra is open source software developed by the GeoGebra Group, which consists of the non-profit organization International GeoGebra Institute and GeoGebra GmbH having their offices in Linz, Austria. The installers, web applications and services, and associated documentation are available at www.geogebra.org. This app complies with the β€œGeoGebra Non-Commercial License Agreement” stated in www.geogebra.org/licences. For commercial use of GeoGebra, please email to office@geogebra.org.

About

i

Features
Read full description

β€˜i-Invigilation (HKDSE)β€˜ is one of the mobile applications under the PESS2 designated for facilitating HKDSE invigilators to perform invigilation duties and enhance the efficiency of examination procedures, such as candidates' attendance recording and script collection, in the examination centres.

Screenshots

gMath4 screens
i4 screens

Verdict

The call

The clearest difference is update cadence: gMath at every 2 weeks against i's every 12 months. gMath also leads on iOS requirement (9.0 vs 12.1). On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

gMath ships an update every 2 weeks, i every 12 months. Both last shipped on November 12, 2026.

Scorecard2 real differences Β· 6 level
gMath versus i: the parameters behind the verdict, then further details
ParametergMathi
PriceFreeFree
Positive reviews66.7% of reviewsβ€”
Update frequencyEvery 2 weeks β€” betterEvery 12 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeβ€”
DevicesiPhone, iPad, iPod β€” betteriPhone, iPod
Requires iOS9.0 β€” better12.1
Further details β€” not scored
Size18 MB64 MB
Age rating4+17+
DeveloperBULL.B TECHNOLOGY LIMITEDHong Kong Examinations And Assessment Authority

In-app purchases

None

gMath

No in-app purchases

None

i

No in-app purchases

Questions

Is gMath free?
gMath is free to download, with no in-app purchases.
Is i free?
i is free to download, with no in-app purchases.
Do gMath or i have ads?
Neither gMath nor i shows ads.
Which is updated more often, gMath or i?
gMath ships an update every 2 weeks, and i every 12 months. Most recently, gMath was updated on November 12, 2026 and i on November 12, 2026.

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