Comparison

Dualock vs Calculator

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

Head to head
About

Dualock

This app securely stores your notes by splitting them into two encrypted parts, stored separately. Access requires authentication from two specified SNS accounts, ensuring your data remains private and inaccessible to others.

Highlights
  • Two-part encrypted note storage
  • Separate cloud storage for each part
  • Dual SNS account authentication
  • No password required
  • Secure and private data handling
Features
Read full description

Write your note. Leave Dualock keep it safe in the cloud. We do not use password, because password is not safe enough and hard to remember. Every note you saved here will be splited into two part. Both the parts will encrypted separately and saved separately, using a pair of SNS account you specified. To unlock your note, both accounts is needed. Only you know the pair and the order of the pair. It's safe. Even I don't know how to crack it.

About

Calculator

Features
Read full description

Designed for frequent calculations, making every input faster and smoother. Entered one wrong digit? There is no need to start over. FastCalc lets you edit an expression directly, insert, delete, or change numbers and operators at any position, and see the result update as you type. EDIT FREELY • Insert, delete, or change any part of an expression • Calculate and display results in real time as you type • Smart input checks help reduce invalid expressions and input errors FASTER INPUT • A larger, more prominent “+” key for repeated calculations • A dedicated “00” key for entering large numbers more efficiently • Start with “.” and the leading zero is added automatically, saving one tap CALCULATION HISTORY • View the current expression and calculation history on the same screen for easy comparison and reuse • Double-tap a history item to use it again • Copy a result, insert it, or replace the current expression • Premium lets you add color tags and notes to important calculations CLEAR DISPLAY • Choose three-digit or four-digit number grouping • Use a comma, space, or underscore as the separator to match different regional number formats • Long expressions remain clear and easy to review or edit CONVENIENT CONTROLS • On supported system versions, open the calculator from Control Center or the Lock Screen • Optionally clear the expression after pressing “=” so you can begin the next calculation immediately PERSONALIZE YOUR EXPERIENCE • Choose from multiple calculator themes • Some themes support both light and dark appearances • Select from several key sounds and spoken feedback options • Refined sound and haptic feedback make every tap feel more responsive PREMIUM Make one lifetime purchase to unlock history colors and notes, every theme and sound option, and other Premium features. FastCalc does more than display an answer. It is designed to make entering, editing, comparing, and reusing calculations more convenient. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://baolesoft.com/privacy/fast-calculator/

Screenshots

Dualock3 screens
Calculator4 screens

Verdict

The call

The clearest difference is price: Calculator at Free against Dualock's $1.99. Calculator also leads on update cadence (fortnightly vs every 4 months). Dualock's advantage is in-app purchases (none vs 3) and iOS requirement (12.0 vs 16.0). On ads 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

Calculator is free to download; Dualock costs $1.99 up front. Calculator sells 3 in-app purchases, starting at $0.99 per month. Dualock asks for nothing beyond the download.

UpkeepUpdate frequency

Dualock ships an update every 4 months, Calculator fortnightly. The most recent releases landed on October 3, 2026 and September 27, 2026 respectively.

Scorecard4 real differences · 5 level
Dualock versus Calculator: the parameters behind the verdict, then further details
ParameterDualockCalculator
Price$1.99Free — better
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 4 monthsFortnightly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaid—
DevicesiPhone, iPodiPhone, iPad
Requires iOS12.0 — better16.0
Further details — not scored
Size26 MB7 MB
Age rating4+4+
DeveloperGear Zero Network Inc.深圳宝乐软件有限公司

In-app purchases

None

Dualock

No in-app purchases

3 purchases

Calculator

Subscriptions2
  • 1个月$0.991 Month
  • 1 年$1.991 Year
One-time1
  • 终身会员$2.99

Questions

Is Dualock free?
Dualock costs $1.99, with no in-app purchases.
Is Calculator free?
Calculator is free to download, with in-app purchases available.
Do Dualock or Calculator have ads?
Neither Dualock nor Calculator shows ads.
Which is updated more often, Dualock or Calculator?
Dualock ships an update every 4 months, and Calculator fortnightly. Most recently, Dualock was updated on October 3, 2026 and Calculator on September 27, 2026.

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