Calculator vs CellVkey
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calculator
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Calculator- scientific: Your Comprehensive Math Powerhouse Calculator- scientific is a powerful calculation suite designed for home, school, and office. Featuring a robust math parser, it delivers precise results across a wide range of functions and specialized modes. Six Powerful Calculation Modes: Main View: Access memory, power, square root, logarithmic, factorial, floor, ceil, random, and over 30 trigonometric functions. Simply input your formula and evaluate. Programmer View: Perform conversions between DEC, BIN, HEX, OCT systems and execute various masking operations. Statistics View: Calculate median, standard deviation, and generate random numbers. IP Subnet View: Quickly compute subnets from any given IP address. Converter View: Convert values effortlessly between units of length, area, volume, mass, time, and many more. Matrix View: Execute complex matrix calculations including determinant, inverse, and matrix multiplication. Core Features: Advanced Math Parser: Utilizes DDMathParser for accurate and reliable calculations. Intuitive Interface: Navigate easily with a convenient slide-out sidebar menu. Calculator- scientific is the ultimate tool for students, professionals, and anyone needing a versatile and precise calculator. Download now to elevate your computations!
CellVkey
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Cellbedell system (CBD) is a easy access control system deploying BLE technology with edge and cloud computing for smart hospitality and property management industry. It truly improves managers and guests experience in a efficient and cost-effective way.
Screenshots
Verdict
The clearest difference is ads: CellVkey at none against Calculator's shown. CellVkey also leads on update cadence (every 4 weeks vs every 110 months). On price, in-app purchases, 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. Neither carries in-app purchases, so what you see is what you pay.
Calculator ships an update every 110 months, CellVkey every 4 weeks. Both last shipped on October 29, 2026.
| Parameter | Calculator | CellVkey |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 110 months | Every 4 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPod, Apple Watch — better |
| Requires iOS | 15.6 | 15.4 — better |
| Further details — not scored | ||
| Size | 10 MB | 18 MB |
| Age rating | 4+ | 4+ |
| Developer | Ramalingam Sivaramakrishnan | NESTECH CORPORATION, LTD. |
In-app purchases
Calculator
No in-app purchases
CellVkey
No in-app purchases









