Comparison

ただの電卓 vs Focus Mirror

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

Head to head
About

ただの電卓

Features
Read full description

iPhoneやiPadで使える。多目的な計算機です。 ※機能 機能は計算と多少の公式計算が出来ます。 銀行の金利の計算 消費税の計算 将来の貯金額の計算 株式配当率計算 比例式の計算 などの計算が数値を入力するだけで計算する事ができます。 計算画面広告なし 古い端末でも起動できます。

About

Focus Mirror

Features
Read full description

See yourself on camera, and stay focused on your own. People often act differently when they feel watched — a phenomenon known as social facilitation. Focus Mirror uses your front camera to recreate that feeling while you study or work, and gently alerts you with a glowing screen edge or a vibration when you leave your seat or look away for too long. ■ Two detection modes for different kinds of work • Gaze: For screen work like a computer. Your usual posture is recorded during a 3-second countdown, and you're alerted when you keep looking down, up, or away. • Face: For reading, writing, or studying at your desk. Looking slightly away or down is fine — you're alerted only when you leave or turn fully sideways. ■ A timer in the Dynamic Island • Time remaining blends right into the Dynamic Island • A ring around the screen edge shows your progress at a glance • The island and ring change color when you need a nudge • Keep an eye on the timer with Live Activities, even outside the app ■ Blur or hide yourself • Blur your image (low, medium, high) or hide it completely • Detection keeps running while hidden, so you can work without distraction ■ Track and review your focus • Records focus time, time away, warnings, and your focus rate • Compare with your last session and browse your history • Battery history shows charge levels over time, with charging periods highlighted ■ Place it any way you like • Portrait, landscape, and upside down — prop it up however your charging cable allows • Choose a fixed orientation that stays even when rotation is locked • Works on iPhone and iPad ■ Built for long sessions • Three power-saving levels for camera and detection • Automatically lowers the load in Low Power Mode or when the device gets warm ■ Privacy • Face detection runs only on your device using Apple's Vision framework • Camera video and photos are never saved or sent anywhere • No account needed. Your records stay on your device ■ Pricing This app is free to use. Premium is available as monthly and yearly auto-renewing subscriptions, as well as a one-time purchase. Prices are displayed in the App Store. Premium removes all ads and lets you register up to three viewing positions. Eligible users can try the yearly plan free for 7 days. ■ Great for • Studying at home or preparing for exams • Staying off your phone while working remotely • Creating a study-hall atmosphere on your own • Building a habit by tracking your study time Focus Mirror is designed to help you get into focus. It does not measure or evaluate your ability to concentrate. Detection can be affected by lighting and camera angle. Terms of Use: https://taka3267-collab.github.io/tkApps/focus-camera/terms.html Privacy Policy: https://taka3267-collab.github.io/tkApps/focus-camera/privacy-policy.html

Screenshots

ただの電卓3 screens
Focus Mirror4 screens

Verdict

The call

The clearest difference is in-app purchases: ただの電卓 at none against Focus Mirror's 3. ただの電卓 also leads on ads (none vs shown) and iOS requirement (12.0 vs 17.0). Focus Mirror's advantage is update cadence (every 5 days vs fortnightly). On price 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Focus Mirror sells 3 in-app purchases, starting at $0.99 per month. ただの電卓 asks for nothing beyond the download.

UpkeepUpdate frequency

ただの電卓 ships an update fortnightly, Focus Mirror every 5 days. The most recent releases landed on September 30, 2026 and October 9, 2026 respectively.

Scorecard4 real differences · 5 level
ただの電卓 versus Focus Mirror: the parameters behind the verdict, then further details
Parameterただの電卓Focus Mirror
PriceFreeFree
Rating4.3 (3 ratings) — better—
Positive reviews70.0% of reviews—
Number of ratings3 — better—
Update frequencyFortnightlyEvery 5 days — better
AdsNo — betterYes
In-app purchasesNo — betterYes
DevicesiPhone, iPad, iPodiPhone, iPad, Apple Watch
Requires iOS12.0 — better17.0
Further details — not scored
Size14 MB8 MB
Age rating4+4+
DeveloperHIROKI HORIGUCHITakahiro Kimura

In-app purchases

None

ただの電卓

No in-app purchases

3 purchases

Focus Mirror

Subscriptions2
  • Remove Ads Monthly Plan$0.991 Month
  • Remove Ads Yearly Plan7 Days trial$9.991 Year
One-time1
  • Remove Ads Lifetime$39.99

Questions

Is ただの電卓 free?
ただの電卓 is free to download, with no in-app purchases.
Is Focus Mirror free?
Focus Mirror is free to download, with in-app purchases available.
Do ただの電卓 or Focus Mirror have ads?
Focus Mirror shows ads; ただの電卓 does not.
Which is updated more often, ただの電卓 or Focus Mirror?
ただの電卓 ships an update fortnightly, and Focus Mirror every 5 days. Most recently, ただの電卓 was updated on September 30, 2026 and Focus Mirror on October 9, 2026.

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