Comparison

Converter One vs Device Battery Manager

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

Head to head
About

Converter One

Features
Read full description

Converter One is a beautifully crafted universal unit converter that runs seamlessly across iPhone, iPad, Mac, and Apple Vision Pro. Designed for simplicity and precision, it offers an elegant, distraction-free interface that feels perfectly at home in every Apple environment. FEATURES • Instantly convert across all major unit types • Universal design for iOS, iPadOS, macOS, and visionOS • Smooth 3D experience and gesture support on Vision Pro • Favorites and smart search for quick access • Adaptive layout that feels natural on any device • Haptic feedback and dynamic “liquid glass” visuals • Fully offline, ad-free, and privacy-friendly SUPPORTED CATEGORIES Length, Area, Volume, Weight, Temperature, Speed, Time, Pressure, Energy, Power, Force, Angle, Data, Data Rate, Frequency, Fuel, Density, Torque, and more. PRIVACY Converter One collects no personal data and works completely offline.

About

Device Battery Manager

This app helps you track battery life for all your household devices. Receive timely notifications before batteries die, ensuring you're always prepared with replacements. Manage battery types, replacement dates, and expected lifespans for every device.

Highlights
  • Track unlimited devices
  • Smart replacement reminders
  • Comprehensive battery database
  • Customizable battery lists
  • Visual status indicators
  • Flexible sorting options
  • Dark mode support
Features
Read full description

Never Forget Another Battery Replacement Device Battery Manager helps you track battery life across all your household devices and electronics. Stop wondering when you last changed the batteries in your smoke detector, TV remote, or wireless mouse. Get timely notifications before batteries die, so you're always prepared. Key Features: • Track Unlimited Devices - Monitor batteries in remote controls, smoke detectors, thermostats, toys, cameras, wireless keyboards, wall clocks, and any battery-powered device in your home • Smart Replacement Reminders - Set custom lifespan expectations for each device and receive notifications when it's time to replace batteries • Comprehensive Battery Database - Choose from over 160 battery types including AA, AAA, CR2032, 9-volt, button cells, camera batteries, hearing aid batteries, and specialized lithium-ion types • Customizable Battery Lists - Select only the battery types you use from common and uncommon categories to keep your picker lists clean and relevant • Visual Status Indicators - See at a glance which devices need attention with color-coded status badges and progress rings showing remaining battery life • Flexible Sorting - Organize your devices by days remaining, device name, or date added to prioritize what needs attention first • Track Important Details - Record device name, battery type, brand, quantity, replacement date, and expected lifespan for complete battery management • Dark Mode Support - Seamlessly adapts to your device's appearance settings for comfortable viewing anytime Perfect For: Homeowners managing smoke detectors and security systems, parents tracking toys and gaming controllers, professionals monitoring camera equipment and wireless peripherals, or anyone tired of dead batteries at inconvenient times. Simple. Smart. Never Be Caught Without Power. Download Device Battery Manager today and take control of every battery in your life.

Screenshots

Converter One4 screens
Device Battery Manager4 screens

Verdict

The call

The clearest difference is price: Device Battery Manager at Free against Converter One's $0.99. Device Battery Manager also leads on update cadence (every 5 days vs every 6 months). On ads, 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

CostPrice · In-app purchases · Ads · Monetization

Device Battery Manager is free to download; Converter One costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Converter One ships an update every 6 months, Device Battery Manager every 5 days. The most recent releases landed on October 3, 2026 and October 24, 2026 respectively.

Scorecard2 real differences · 7 level
Converter One versus Device Battery Manager: the parameters behind the verdict, then further details
ParameterConverter OneDevice Battery Manager
Price$0.99Free — better
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyEvery 6 monthsEvery 5 days — better
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPad — betteriPhone
Requires iOS17.617.6
Further details — not scored
Size10 MB5 MB
Age rating4+4+
DeveloperAshkan ZanjaniRobert Wood

In-app purchases

None

Converter One

No in-app purchases

None

Device Battery Manager

No in-app purchases

Questions

Is Converter One free?
Converter One costs $0.99, with no in-app purchases.
Is Device Battery Manager free?
Device Battery Manager is free to download, with no in-app purchases.
Do Converter One or Device Battery Manager have ads?
Neither Converter One nor Device Battery Manager shows ads.
Which is updated more often, Converter One or Device Battery Manager?
Converter One ships an update every 6 months, and Device Battery Manager every 5 days. Most recently, Converter One was updated on October 3, 2026 and Device Battery Manager on October 24, 2026.

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