BATTech by RN vs LumioCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BATTech by RN
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Introducing BATTech—the ultimate application designed to simplify complex battery calculations and generate professional PDF reports effortlessly. Developed with the expertise of Mr. Ramesh Natarajan, a veteran with over 42 years in the lead-acid battery industry, BATTech ensures precision, reliability, and efficiency at your fingertips. Why BATTech? - Accurate Calculations – Leverage industry-proven formulas for unparalleled precision. - Customizable Parameters – Tailor inputs to match your unique requirements. - Professional PDF Reports – Generate, share, and archive detailed reports instantly. - Industry-Standard Reliability – Built on decades of battery design expertise. - User-Friendly Interface – Navigate with ease, no matter your experience level. The Legacy Behind BATTech Created with insights from Ramesh Natarajan, a pioneer in the battery industry, BATTech empowers manufacturers, engineers, and educators to optimize processes, enhance product quality, and drive innovation. Who is BATTech For? - Battery Manufacturers & Engineers - Researchers & Educators - Industry Enthusiasts & Innovators Whether you’re designing, analyzing, or educating, BATTech is your go-to solution for simplified, accurate, and professional battery calculations.
LumioCalc
A fast and customizable scientific calculator for iPhone and iPad. It offers advanced functions, a scrollable history, and premium themes for a personalized user experience. Ideal for students, engineers, and everyday calculations.
- Scientific calculator functions
- Degree/radian modes
- Full expression support
- Scrollable calculation history
- Premium themes and custom styling
- Standard and scientific layouts
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Meet LumioCalc — the calculator that looks as good as it performs. From quick everyday arithmetic to advanced scientific operations, LumioCalc delivers speed, precision, and complete visual control. Choose from a growing collection of handcrafted themes or design your own from scratch with a deeply customizable theme editor. BEAUTIFUL THEMES, BUILT IN Pick from glossy, frosted, seasonal, and curated themes — each with its own color palette, typography, and personality. Explore favorites including Paper & Ink, Cobalt Studio and Lumio, plus the new Halloween-inspired Moonlit Gothic Observatory. MAKE IT YOURS LumioCalc Pro unlocks the full theme editor. Customize every detail: background colors, gradients, and images; button shapes, shadows, and corner radius; per-category colors for digits, operations, functions, memory, and scientific buttons; display, button, and scientific typography; haptic feedback; button sounds (Click, Tick, Pop); and animation styles (Push, Bounce, Glow, Liquid, Spin) with adjustable speed and intensity. POWERFUL CALCULATOR - Standard and scientific modes with one tap to switch - Trigonometric, logarithmic, exponential, and root functions - Radian and degree mode toggle - Memory operations (MC, MR, M+, M-) - Full parentheses and expression support - Scrollable calculation history — tap any result to reuse it - Keyboard input support DESIGNED FOR EVERY SCREEN Portrait and landscape layouts on iPhone. An adaptive iPad layout with a side-by-side scientific panel and history sidebar when you have the space. FREE TO USE, PRO TO PERSONALIZE Every calculator feature and a selection of built-in themes are completely free. Try every LumioCalc Pro feature free for 7 days, including premium themes and the full theme editor. Create custom themes, explore every personalization option, and decide if Pro is for you. When the trial ends, simply continue using LumioCalc for free or unlock Pro with a one-time purchase — no subscription. Buy once and unlock Pro across iPhone, iPad and Mac with the same Apple ID. Whether you are a student, engineer, designer, or just someone who wants a calculator with personality — LumioCalc gives you power and style in one app.
Screenshots
Verdict
The clearest difference is in-app purchases: BATTech by RN at none against LumioCalc's 1. BATTech by RN also leads on iOS requirement (15.5 vs 18.0). On price, update cadence, 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
Both are free to download. LumioCalc sells 1 one-off in-app purchase. BATTech by RN asks for nothing beyond the download.
Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 28, 2026 and October 12, 2026 respectively.
| Parameter | BATTech by RN | LumioCalc |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 2 months | Every 2 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 15.5 — better | 18.0 |
| Further details — not scored | ||
| Size | 38 MB | 27 MB |
| Age rating | 4+ | 4+ |
| Developer | Ramesh Natarajan Kailad | Nathan Booth |
In-app purchases
BATTech by RN
No in-app purchases
LumioCalc
- Lifetime Pro$4.99









