Comparison

Not Another Twin Calculator vs Focus Protocol

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

Head to head
About

Not Another Twin Calculator

Features
Read full description

This is a straightforward dual calculator designed for real work. You get two clean calculators side-by-side, so you can compare numbers, transfer results between panels, and keep moving. What it does: Two calculators in one screen for fast side-by-side work Move results between calculators with a tap Separate history for each calculator Basic calculations only — no clutter, no gimmicks Works smoothly on iPhone and iPad Why it exists: Most calculators keep adding “features” that slow you down. This one stays focused: quick, readable, and practical. If you want a calculator that feels like the classic tools—simple, reliable, and efficient—this is it. ——— Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://andyarevalo.com/privacy.html Terms of Service: https://andyarevalo.com/terms.html Support: https://andyarevalo.com/support.html

About

Focus Protocol

Features
Read full description

Silence the noise. Enter the protocol. FocusProtocol is not just a timer. It is a system designed to induce and sustain the flow state. By combining military-grade app blocking with psycho-acoustic audio engineering, FocusProtocol removes willpower from the equation. Zero distractions Engage the Shield to lock down distracting apps and websites instantly. Built on Apple’s native Screen Time API to create a breach-proof environment. Leaving the protocol requires a conscious decision to fail. Neural audio Enter deep work with our proprietary pink noise engine. Unlike white noise, pink noise reduces brain-wave complexity, promoting stable attention while masking interruptions without fatigue. Global pulse You are not alone. View the live active protocols counter and work alongside thousands in real time. Synchronize your energy with a global rhythm of productivity. Rituals and rewards Dopamine is a tool. Use it deliberately. Completion rituals reinforce your success loop and lock in momentum. OLED-optimized Designed for night owls and early risers. A true-black interface reduces eye strain and preserves battery during long sessions. FocusProtocol Control the environment. Enter flow. Execute.

Screenshots

Not Another Twin Calculator3 screens
Focus Protocol3 screens

Verdict

The call

The clearest difference is price: Not Another Twin Calculator at Free against Focus Protocol's $0.99. Not Another Twin Calculator also leads on iOS requirement (16.0 vs 26.0). On update cadence, ads, in-app purchases 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

Not Another Twin Calculator is free to download; Focus Protocol costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Not Another Twin Calculator ships an update every 2 months, Focus Protocol every 6 weeks. The most recent releases landed on October 25, 2026 and October 15, 2026 respectively.

Scorecard2 real differences · 4 level
Not Another Twin Calculator versus Focus Protocol: the parameters behind the verdict, then further details
ParameterNot Another Twin CalculatorFocus Protocol
PriceFree — better$0.99
Update frequencyEvery 2 monthsEvery 6 weeks — better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.0 — better26.0
Further details — not scored
Size10 MB2 MB
Age rating4+4+
DeveloperAndy ArevaloAlice-Georgiana TURCANU

In-app purchases

None

Not Another Twin Calculator

No in-app purchases

None

Focus Protocol

No in-app purchases

Questions

Is Not Another Twin Calculator free?
Not Another Twin Calculator is free to download, with no in-app purchases.
Is Focus Protocol free?
Focus Protocol costs $0.99, with no in-app purchases.
Do Not Another Twin Calculator or Focus Protocol have ads?
Neither Not Another Twin Calculator nor Focus Protocol shows ads.
Which is updated more often, Not Another Twin Calculator or Focus Protocol?
Not Another Twin Calculator ships an update every 2 months, and Focus Protocol every 6 weeks. Most recently, Not Another Twin Calculator was updated on October 25, 2026 and Focus Protocol on October 15, 2026.

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