Comparison

Trigonometric Time Attack vs ClassLens

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

Head to head
About

Trigonometric Time Attack

Features
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From those who want to practice trigonometric functions to teachers who want to introduce them in class and have their students compete. Train with the angles you use most often. Trigonometric functions are displayed. Press the corresponding button. You will be presented with random questions covering the most frequently used angles. You can choose from two types: 0ยฐ to 180ยฐ and 0ยฐ to 360ยฐ. You can choose between the degree method and the arc degree method. The achievement status is recorded. It will be recorded according to the number of mistakes and the time taken. The last trophy does not allow even a single mistake. It is very difficult!

About

ClassLens

Features
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ๆ–ฐใ—ใ„ๆ™‚้–“ๅ‰ฒใ‚ขใƒ—ใƒช็™ปๅ ด๏ผ ใ‚‚ใ†ๆ™‚้–“ๅ‰ฒใฎ็ฎก็†ใ ใ‘ใงใฏ็‰ฉ่ถณใ‚Šใชใ„๏ผ็งใŸใกใฎๆ–ฐใ—ใ„ใ‚ขใƒ—ใƒชใฏใ€ๆŽˆๆฅญใฎๆ™‚้–“ๅ‰ฒใ‚’ๅ…ฅๅŠ›ใ™ใ‚‹ใ ใ‘ใงใชใใ€ๆŽˆๆฅญใ”ใจใซๅ†™็œŸใ‚’่‡ชๅ‹•ใงๆ•ด็†ใ—ใฆใใ‚Œใพใ™ใ€‚ๆŽˆๆฅญๆ™‚้–“ใ‚’่จญๅฎšใ™ใ‚‹ใ ใ‘ใงใ€ๆŽˆๆฅญไธญใซๆ’ฎใฃใŸๅ†™็œŸใŒ่‡ชๅ‹•ใงๅ„ๆŽˆๆฅญใƒ•ใ‚ฉใƒซใƒ€ใซๅˆ†้กžใ•ใ‚Œใ‚‹ใฎใงใ€ๆŽขใ™ๆ‰‹้–“ใŒใชใใ€ๅ‹‰ๅผทใฎๅŠน็އใ‚ขใƒƒใƒ—้–“้•ใ„ใชใ—๏ผ ใƒ‡ใƒ•ใ‚ฉใƒซใƒˆใฎใ‚ซใƒกใƒฉใงๆ’ฎใฃใŸๆŽˆๆฅญใฎๅ†™็œŸใฏใฉใฎๆŽˆๆฅญใฎๅ†™็œŸใ‹ใ„ใคใฎๅ†™็œŸใ‹ใ‚ใ‹ใ‚‰ใชใใชใ‚Šใพใ›ใ‚“ใ‹๏ผŸ ใ“ใฎใ‚ขใƒ—ใƒชใ‚’ไฝฟใˆใฐใฉใฎๆŽˆๆฅญใฎๅ†™็œŸใ‹ไธ€็›ฎ็žญ็„ถใ€‚ใ„ใคๆ’ฎใฃใŸๅ†™็œŸใ‹ใ‚‚ใ‚ใ‹ใ‚Šใ‚„ใ™ใ่กจ็คบใ•ใ‚Œใพใ™ใ€‚

Screenshots

Trigonometric Time Attack3 screens
ClassLens3 screens

Verdict

The call

The clearest difference is update cadence: ClassLens at every 3 weeks against Trigonometric Time Attack's every 2 months. On price, ads, in-app purchases and device support there is nothing between them.

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

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

UpkeepUpdate frequency

Trigonometric Time Attack ships an update every 2 months, ClassLens every 3 weeks. The most recent releases landed on September 9, 2026 and May 16, 2026 respectively.

Scorecard1 real difference ยท 5 level
Trigonometric Time Attack versus ClassLens: the parameters behind the verdict, then further details
ParameterTrigonometric Time AttackClassLens
PriceFreeFree
Update frequencyEvery 2 monthsEvery 3 weeks โ€” better
AdsYesYes
In-app purchasesNoNo
DevicesiPhone, iPod โ€” betteriPhone
Requires iOS15.0 โ€” better16.4
Further details โ€” not scored
Size25 MB3 MB
Age rating4+4+
Developertakamitsu furuyaAtsuhiro Hasebe

In-app purchases

None

Trigonometric Time Attack

No in-app purchases

None

ClassLens

No in-app purchases

Questions

Is Trigonometric Time Attack free?
Trigonometric Time Attack is free to download, with no in-app purchases.
Is ClassLens free?
ClassLens is free to download, with no in-app purchases.
Do Trigonometric Time Attack or ClassLens have ads?
Both Trigonometric Time Attack and ClassLens show ads.
Which is updated more often, Trigonometric Time Attack or ClassLens?
Trigonometric Time Attack ships an update every 2 months, and ClassLens every 3 weeks. Most recently, Trigonometric Time Attack was updated on September 9, 2026 and ClassLens on May 16, 2026.

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