Comparison

CodeMaster4 vs EV Battery Guide

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

Head to head
About

CodeMaster4

Features
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CodeMaster4™ is a professional app designed for operating the MIRACLE™ key machine, offering professional locksmiths a range of features for efficient and user-friendly key cutting. The app enables professional locksmiths to cut and duplicate keys using an extensive collection of car, house, and special keys, while providing convenience features for seamless machine operation. Key features include: - An extensive key database covering car, motorbike, residential, and various specialized keys. - Simple and fast key cutting and duplication. - Customizable key cutting options to meet specific needs. - Easy creation and management of personal key data. - Wear correction feature for older key cylinders. - Favorites and history management for quick access to frequently used key data. - Machine management tools, including calibration, to ensure optimal performance. - Key marking function for easy identification. - Additional features for seamless operation of the MIRACLE™ key machine. ■ Supported Devices - Tablet PCs, Smartphones ■ Communication - Bluetooth LE(Wireless) ■ Screen Orientation - Tablet: Fixed Landscape Mode - Smartphone: Fixed Portrait Mode ■ Supported Languages - English - Korean (한국어) - Japanese (日本語) - Spanish (Español) - Portuguese(Português) ■ Supported MIRACLE™ Products - MIRACLE™-A9 Nova ■ Contact Us Redt Inc. www.iredt.com ▶ Customer Support Email: tech-support@iredt.com

About

EV Battery Guide

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EV Battery Guide is an independent educational tool for EV owners — built to help you actually understand the battery in your car. What's inside: • Open-Circuit Voltage (OCV) vs SOC curves — see your battery's true voltage behavior • DC fast-charging power curves — understand the CC→CV transition and why it slows down • BMS buffer visualization — your "100%" isn't really 100% • Capacity retention prediction — how much will be left in 5 or 10 years? • Cycle life vs depth-of-discharge — why shallow cycling lasts longer • Lithium plating risk heatmap — what to watch out for in cold weather • Winter range loss waterfall — where exactly does the range go? • Speed × temperature energy matrix — the dual cost of highway and cold • Cost-per-mile comparison — home charging, fast charging, and gas • 13 interactive professional charts — built on public cell datasets Coverage: 65 popular EV configurations across 7 distinct cell chemistries (LFP / NCA 2170 / NCA 18650 / 4680 / NMC / LiCoO₂), with chemistry-specific recommendations for each. Three languages: Full support for English, 中文, and 日本語. Switch anytime in-app. Privacy first: • No accounts, no email • No user data collection • No third-party analytics or ad SDKs • Your selected vehicle and language preference live only on this device Completely free: No subscriptions, no in-app purchases, no ads. All features are open from day one. Disclaimer: This app is not affiliated with any vehicle manufacturer. Vehicle model names are used solely to describe battery chemistry, parameters, and charging characteristics — a nominative fair use. All data is sourced from public cell data sheets, EPA filings, and peer-reviewed research.

Screenshots

CodeMaster44 screens
EV Battery Guide3 screens

Verdict

The call

CodeMaster4 and EV Battery Guide are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ScorecardNo meaningful differences
CodeMaster4 versus EV Battery Guide: the parameters behind the verdict, then further details
ParameterCodeMaster4EV Battery Guide
PriceFreeFree
Update frequencyFortnightly—
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.0 — better15.1
Further details — not scored
Size202 MB35 MB
Age rating4+4+
DeveloperRedt Inc.何南 李

In-app purchases

None

CodeMaster4

No in-app purchases

None

EV Battery Guide

No in-app purchases

Questions

Is CodeMaster4 free?
CodeMaster4 is free to download, with no in-app purchases.
Is EV Battery Guide free?
EV Battery Guide is free to download, with no in-app purchases.
Do CodeMaster4 or EV Battery Guide have ads?
Neither CodeMaster4 nor EV Battery Guide shows ads.

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