Comparison

MindDoom vs CalcGate | App Lock with Math

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

Head to head
About

MindDoom

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MindDoom – Reclaim your time. Build your Dino Island. Do you spend more time scrolling than you want? MindDoom helps you reduce screen time, stay focused, and build better habits — while hatching cute dinosaurs on your own floating island. Your real-world habits shape your world in the app. Stay in Control • Set custom daily limits and block distracting apps • Use short, safe breaks without losing progress • Reduce screen time with simple, effective tools Gamify Your Focus • Earn “Seeds” for healthy screen time • Buy and hatch dinosaur eggs • Collect dinos and expand your island Your island changes based on how you use your phone: • Healthy habits → sunshine & growth • Too much scrolling → clouds, rain, and storms • Bad days → your island slips into winter Track Your Digital Habits • Daily screen time • Pickups • Weekly & monthly trends • Build sustainable habits that actually last Private by Design • 100% on-device — nothing leaves your phone • No ads, no tracking, no accounts • Uses Apple’s native ScreenTime APIs for maximum privacy Your time. Your island. Your rules. Take back control with MindDoom.

About

CalcGate | App Lock with Math

Features
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CalcGate is a screen time control app designed for people who want to break the habit of opening distracting apps without thinking. Have you ever opened social media “just for a minute,” only to lose track of time? Do you find yourself checking your phone when you should be studying, working, or focusing? Do app limits feel too easy to ignore or turn off? CalcGate adds a simple but effective moment of friction before you can reopen restricted apps. Choose the apps or app categories you want to limit, start a lock, and CalcGate will require you to solve math challenges before access can be restored early. Unlike blockers that can be dismissed instantly, CalcGate is designed to make you pause and ask yourself: “Do I really want to open this app right now?” To unlock early, every math problem must be answered correctly. If you make a mistake, your progress resets and the challenge starts again from the beginning. This small hurdle helps interrupt automatic habits like repeatedly opening social media, video apps, games, or other distractions without thinking. CalcGate is useful for study sessions, deep work, productivity, reading, reducing late-night scrolling, managing screen time, and building healthier digital routines. Key features: ・Restrict selected apps or app categories ・Start instant locks anytime ・Create recurring daily lock schedules ・Unlock early by solving math challenges ・Customize challenge difficulty and question count ・Reset progress after incorrect answers CalcGate is not about completely avoiding your phone. It is about using your phone more intentionally. Whether you want to improve focus, study without distractions, reduce social media overuse, build better habits, or create a healthier relationship with your device, CalcGate helps you pause before you tap. Start using CalcGate today and build the habit of thinking before unlocking.

Screenshots

MindDoom4 screens
CalcGate | App Lock with Math4 screens

Verdict

The call

The clearest difference is iOS requirement: MindDoom at 18.5 against CalcGate | App Lock with Math's 26.2. On price, update cadence, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

MindDoom ships an update every 2 weeks, CalcGate | App Lock with Math every 3 weeks. The most recent releases landed on June 5, 2026 and September 12, 2026 respectively.

Scorecard1 real difference · 5 level
MindDoom versus CalcGate | App Lock with Math: the parameters behind the verdict, then further details
ParameterMindDoomCalcGate | App Lock with Math
PriceFreeFree
Update frequencyEvery 2 weeks — betterEvery 3 weeks
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.5 — better26.2
Further details — not scored
Size117 MB4 MB
Age rating9+4+
DeveloperJustus LaskeHIDEYUKI INAGAKI

In-app purchases

None

MindDoom

No in-app purchases

None

CalcGate | App Lock with Math

No in-app purchases

Questions

Is MindDoom free?
MindDoom is free to download, with no in-app purchases.
Is CalcGate | App Lock with Math free?
CalcGate | App Lock with Math is free to download, with no in-app purchases.
Do MindDoom or CalcGate | App Lock with Math have ads?
Neither MindDoom nor CalcGate | App Lock with Math shows ads.
Which is updated more often, MindDoom or CalcGate | App Lock with Math?
MindDoom ships an update every 2 weeks, and CalcGate | App Lock with Math every 3 weeks. Most recently, MindDoom was updated on June 5, 2026 and CalcGate | App Lock with Math on September 12, 2026.

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