Dualock vs Percentage Calc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Two-part encrypted note storage
- Separate cloud storage for each part
- Dual SNS account authentication
- No password required
- Secure and private data handling
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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.
Percentage Calc
Effortlessly calculate discounts, taxes, tips, and investment returns with this intuitive percentage calculator. Get instant, accurate results for shopping, finances, and studies. Offers a private and secure experience without data tracking.
- Percentage calculation
- Discount and tax calculation
- Tip calculation
- ROI and CAGR analysis
- Fraction to percentage conversion
- History and save functionality
- iCloud sync
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Stop guessing percentages. Know the real price before you pay. Percentage Calc is the all-in-one percentage calculator for discounts, tax, tips, ROI and more. Whether you're shopping, managing finances or studying, get instant and accurate results in seconds. • Fast and effortless calculations • Instant results, no waiting • Private and secure, no data tracking Key Features: • Percentage Calculator: Quickly calculate percentages of any amount • Discount Calculator: Instantly see final prices after discounts or increases • Tip Calculator: Calculate tips in seconds • Tax Calculator: Add or reverse sales tax easily • ROI & CAGR Calculator: Analyze investments and returns • Reverse Percentage: Find original values before changes • Fraction to Percentage: Convert fractions instantly • Basis Points (BPS): Convert percentages and basis points • Split Calculator: Divide amounts into multiple parts with percentages • Comparison Tool: Compare values and see percentage differences • History & Save: Access previous calculations anytime • Share Results: Send calculations via messages or email • iCloud Sync: Sync across iPhone, iPad and Mac PRO FEATURES: • Unlimited calculations • Save and manage operations • Share results without limits The Percentage Calc app is designed to be intuitive and easy to use, with an elegant interface that fits perfectly with your device. Optimize your workflow, take care of your finances, and make percentage calculations a breeze. By the way, AppStore reviews are very helpful to us. If you think Percentage Calc is worthy, would you mind taking a moment to write a nice review? We'd greatly appreciate it. Thanks for using Percentage Calc! - If you have a question or need immediate support, please send an email to support@8mobile.org. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.8mobile.org/privacy-policy/ *** Term of Service *** Users who use the Services offered by Percentage Calc declare to know and accept these terms and conditions. The Service is provided by the Owner "as is", without any express or implied warranty for its accuracy or availability. The Owner declines all responsibility in case of errors, inaccessibility of the platform, technical problems related to the service or failure to update the data by the suppliers of the same. All data are for information only and have no legal value. The Owner reserves the right, at any time and without notice, to add, remove features or characteristics or suspend or interrupt the provision of the Service, either temporarily or permanently. The User expressly exonerates and relieves the Owner from any liability, to the extent permitted by the applicable law, in relation to any damage claims of any kind and nature of its own and/or third parties including direct, indirect, punitive, incidental, revenue, loss of data or replacement costs arising from or in any way connected to this agreement.
Screenshots
Verdict
The clearest difference is price: Percentage Calc at Free against Dualock's $1.99. Percentage Calc also leads on update cadence (monthly vs every 4 months) and ratings volume (3 vs 1). Dualock's advantage is rating (5.0 vs 3.7) and in-app purchases (none vs 4). 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
Percentage Calc is free to download; Dualock costs $1.99 up front. Percentage Calc sells 4 in-app purchases, starting at $1.99 per 7 days. Dualock asks for nothing beyond the download.
Dualock holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 1 and 3 respectively.
Dualock ships an update every 4 months, Percentage Calc monthly. The most recent releases landed on November 1, 2026 and November 7, 2026 respectively.
| Parameter | Dualock | Percentage Calc |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 5.0 (1 ratings) — better | 3.7 (3 ratings) |
| Positive reviews | — | 60.0% of reviews |
| Number of ratings | 1 | 3 — better |
| Update frequency | Every 4 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPod | iPhone, iPad, Mac — better |
| Requires iOS | 12.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 26 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Gear Zero Network Inc. | Ottorino Bruni |
Customer experience
Dualock
Percentage Calc
In-app purchases
Dualock
No in-app purchases
Percentage Calc
- 1 Week3 Days trial$1.997 Days
- 1 Month$3.991 Month
- 1 Year$12.991 Year
- Forever$22.99









