Apps by Katsuhiko Yao
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FractionAndProbability
Education
Free
IAP?
Released Feb 2025
· updated Mar 2025
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Cafe WiFi Helper
Lifestyle
Free
IAP?
Released May 2026
· updated Jun 2026
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Make100 - Make 100 Fast
Education
Free
Released Jun 2026
· updated Jul 2026
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ColumnSteps: Addition
Education
Free
IAP?
Released Aug 2026
· updated Aug 2026
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Symmetry Trainer
Education
Free
Released Feb 2026
· updated May 2026
-
GoshimeidesuInSchool
Education
Free
IAP?
Released Sep 2024
· updated Sep 2024
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QuickEra
Productivity
Free
IAP?
Released Feb 2021
· updated Jan 2025
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RemoveParentheses
Education
Free
IAP?
Released Jul 2024
· updated Jul 2024
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PercentTraining
Education
Free
IAP?
Released Apr 2025
· updated Apr 2025
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MultipleClimbing
Education
Free
IAP?
Released Aug 2025
· updated Aug 2025
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RemoveCoefficient
Education
Free
IAP?
Released Jun 2024
· updated Jul 2024
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BorC
Lifestyle
Free
IAP?
Released Aug 2023
· updated Aug 2023
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DivisorDescent
Education
Free
IAP?
Released Aug 2025
· updated Aug 2025
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CommonDivisor
Education
Free
IAP?
Released Jun 2025
· updated Jul 2026
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TranspositionOfItems
Education
Free
IAP?
Released Jun 2024
· updated Sep 2024
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SumXMinus – Negative Math
Education
Free
IAP?
Released Apr 2024
· updated Jun 2026
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GridCalculation
Education
Free
IAP?
Released May 2025
· updated Aug 2026
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AdditionTraining
Education
Free
IAP?
Released Feb 2024
· updated Oct 2024
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Random Quiz
Education
Free
IAP?
Released Apr 2025
· updated Feb 2026
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Coordinates Master
Education
Free
IAP?
Released Oct 2024
· updated May 2026
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QuickAgePlus
Lifestyle
Free
SUB
Released Oct 2023
· updated May 2026
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Neg Multiply – Brain Training
Education
Free
IAP?
Released Jul 2023
· updated Jun 2026
-
Make 10 - Mental Math
Education
Free
IAP?
Released Feb 2024
· updated Jun 2026
-
Multiply Pairs – Mental Math
Education
Free
IAP?
Released Jun 2023
· updated Jun 2026
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MultiplicationTraining
Education
Free
IAP?
Released Feb 2024
· updated Oct 2024
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Power of 2
Education
Free
IAP?
Released Jun 2023
· updated Jun 2023
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QuickCheck3
Lifestyle
Free
IAP?
Released May 2021
· updated Dec 2024
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QuickAge
Lifestyle
Free
IAP?
Released Dec 2020
· updated Oct 2023
-
TimeCalculation
Lifestyle
Free
IAP?
Released Aug 2023
· updated Dec 2024
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Exponent
Education
Free
IAP?
Released Jul 2024
· updated Mar 2026