MathDrill vs Battery Tracker

Choose your challenge level from Easy to Hard, select the operations you want to practice, set your pace with a customizable timer, and dive into focused sessions designed to improve speed and accuracy. After each session, review your mistakes in the Wrong Book, track your progress with detailed statistics, and watch your skills grow over time. Key Features: - Customizable Practice: Select difficulty, operations, number of questions, and time limit to match your skill level. - Wrong Book: Automatically saves missed problems so you can review and learn from mistakes. - Progress Statistics: Visual stats including accuracy rate, best score, total sessions, and average time per session. - Clean & Focused Design: Minimalist interface keeps you focused on solving problems without distractions. - Sound & Vibration Feedback: Optional audio and haptic feedback to enhance the practice experience. - Completely Offline: No internet required. All data stays safely on your device.

Battery Tracker is more than just a battery percentage display. It's your personal battery coach, helping you understand your charging habits by tracking charge and discharge records, and discover ways to extend your battery's lifespan. ■ Real-time Battery Monitor • At-a-glance view of battery level, charging, discharging, and full charge status with a large gauge • Displays charging speed (%/h) and speed rating (Slow, Normal, Fast, Super Fast) • Shows estimated time to target charge and full charge • Displays discharge speed (%/h) while using the battery • Real-time chart of recent battery level changes • Provides battery status and charging tips for different charge levels • Shows current charging session's start time, charged amount, and elapsed time ■ Automatic Charge & Discharge Logging • Automatically records charging and battery usage as sessions • Summarizes start/end times, battery levels, and duration • Compares estimated vs. actual time to reach target charge • View battery level change graphs in session details • Name your chargers to differentiate them • Records persist even if you close and reopen the app; all data is stored only on your device ■ Battery Analysis (Premium) • Number of observed cycles calculated from charging records • Recent average charging speed (%/h) • Long-term charging speed trend graph for 7 days, 30 days, and all time • Compare named chargers/cables by charge amount per hour (%/h) • Estimated remaining usage time based on average discharge speed (Free) ■ Smart Notifications • Charging cable disconnected alert (Free) • Target charge level alert: Choose from 80, 85, 90, 95, 100% (Premium) • Low battery alert: Set your own threshold between 5-25% (Premium) • Do Not Disturb time settings, such as bedtime (Premium) ※ Notifications work while the app collects battery information. Due to iOS background policies, notifications may not be delivered immediately after the app is completely closed. ■ Charging Tools • 5-minute real-time extended chart • Custom charging plans tailored to your goals • Charging speed diagnostics and battery care guide • Premium users can use anytime; Free users can access for the current session by watching an ad ■ Data Export • Export charging records as CSV files (Excel compatible) • Export sessions and measurement samples as JSON files • Option to delete all saved records at once ■ Battery Tracker Premium • Remove all ads • Observed cycles, long-term charging speed trends, charger/cable speed comparison • Target charge level & low battery alerts, Do Not Disturb times • Instant access to 5-minute real-time chart, custom charging plans, charging speed diagnostics • Offers 1-month, 3-month, 6-month, 12-month auto-renewing subscriptions and a lifetime purchase option ■ Free Features • Real-time battery monitor, charging speed, estimated full charge time • Charge/discharge records and session details • Estimated remaining usage time • Cable disconnected alert • CSV & JSON export ■ Privacy Policy • Battery records and settings are stored only on your device. • We do not transmit or sell your charge/discharge records to servers. ■ Please Note • iOS only provides battery level and charging status information. Temperature, voltage, current, power (W), and battery maximum capacity/health cannot be displayed due to iOS policy, and this app does not offer these features. • Charging speed and estimated times are calculated estimates based on battery level changes and may vary depending on screen usage, heat generation, battery protection features, and cable/charger quality. • The more charging sessions you record, the more accurate the analysis becomes. • App-specific battery usage is not provided. - Terms of Use: https://drendrendren.com/terms?app=battery-tracker - Privacy Policy: https://drendrendren.com/privacy?app=battery-tracker Healthy charging habits start with good records.