Calculy vs ESRA secure
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calculy
This free calculator app offers advanced functions beyond basic arithmetic, including a comprehensive unit converter with daily updated currency rates. It supports a wide range of mathematical operations and is available for iPhone and iPad.
- Advanced mathematical functions
- Unit converter with 220+ units
- Daily updated currency rates
- Supports iPad expanded layout
- Hardware keyboard support on iPad
- Ad-free experience
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Calculy is a free calculator for iPhone and iPad. Small yet mighty and totally ad-free. Go beyond basic calculations with Calculy’s full range of functions: • unit converter with more than 220 units from 16 sections (including currencies with daily updated rates) • percentages • square, cube and nth power • square root, cube root and nth root • logarithm, natural logarithm, common logarithm • factorial, reciprocal • rounding • exponentiation to the power of 2, 10, e • Pi, e Euler's number, random numbers • sine, cosine, tangent • arcsine, arccosine, arctangent • hyperbolic sine, hyperbolic cosine, hyperbolic tangent The expanded layout for iPad handily displays all available function keys. Hardware keyboard is supported on the iPad.
ESRA secure
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The ESRA Security App is used for an easy and intuitive operation of ESRA IP cameras. Once you have quickly and easily installed the cameras in your app, you can receive live images and recordings on your smartphone from anywhere. When unwanted occurrences take place, cameras with AI functionalities (e.g. person detection, face detection, line crossing detection), are able generate alarms by sending PUSH notifications, which are visible on the app.
Screenshots
Verdict
The clearest difference is in-app purchases: ESRA secure at none against Calculy's 3. Calculy's advantage is update cadence (every 2 weeks vs every 2 months). On price, ads, device support and iOS requirement 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
Both are free to download. Calculy sells 3 one-off in-app purchases. ESRA secure asks for nothing beyond the download.
Calculy ships an update every 2 weeks, ESRA secure every 2 months. The most recent releases landed on November 3, 2026 and November 7, 2026 respectively.
| Parameter | Calculy | ESRA secure |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 91.3% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 2 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 3 MB | 129 MB |
| Age rating | 4+ | 4+ |
| Developer | Lingo4you Mario Muller und Heike Pahlow GbR | Simon Strobel |
In-app purchases
Calculy
- Buy me a coffee$0.99
- Buy me cookies$1.99
- Buy me a pizza$3.99
ESRA secure
No in-app purchases









