# Zen Battery vs Calculator with 1000 button

The clearest difference is in-app purchases: Calculator with 1000 button at none against Zen Battery's 3. Calculator with 1000 button also leads on update cadence (every 2 months vs every 18 months). Zen Battery's advantage is ads (none vs shown) and iOS requirement (17.6 vs 26.1). On price and device support there is nothing between them.

Both are free to download. Zen Battery sells 3 in-app purchases, starting at $1.99 per month. Calculator with 1000 button asks for nothing beyond the download.

Zen Battery ships an update every 18 months, Calculator with 1000 button every 2 months. The most recent releases landed on November 6, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Zen Battery | Calculator with 1000 button |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (8.1K ratings)](https://appshunter.io/ios/app/zen-battery/id466431322/reviews)** | — |
| Number of ratings | **8.1K** | — |
| Positive reviews | 89.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 18 months | **Every 2 months** |
| Monetization | Subscription | — |
| Size | 117 MB | 42 MB |
| Requires iOS | **17.6** | 26.1 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Shinobit LLC](https://appshunter.io/developer/1680633187) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## What reviewers say

### Zen Battery

[App page](https://appshunter.io/ios/app/zen-battery/id466431322)

This app provides detailed battery information for your iPhone and iPad, including remaining hours for various activities. Customize the visual display with fluid animations and color options. Receive alerts when your device is fully charged.

**Highlights:** Battery life estimation for music, video, calls, and internet, Customizable 'Zen' display modes, Interactive fluid battery animation, Adjustable liquid color and battery design, Full charge warning sound, Widgets for quick battery status

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $1.99 | per month |
| Yearly Subscription | $9.99 | per year |
| Lifetime | $19.99 | one-time |

**What reviewers like**

- 👍 Reliable battery monitoring
- 🚀 Accurate battery percentage display
- 💡 Customizable battery color
- 👍 Simple and easy to use
- 👍 Large, clear battery visualization

**What reviewers complain about**

- 🔋 High battery consumption
- 🐛 Inconsistent battery percentage accuracy
- 🔋 Drains device battery quickly
- 🔒 Subscription-based model

**Reported bugs**

- App freezes or crashes
- Ads break app functionality

**Requested features**

- 12-hour clock option
- Battery saver mode
- Widget support
- Ability to disable ads


### Calculator with 1000 button

[App page](https://appshunter.io/ios/app/calculator-with-1000-button/id6755414486)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Zen Battery free?

Zen Battery is free to download, with in-app purchases available.

### Is Calculator with 1000 button free?

Calculator with 1000 button is free to download, with no in-app purchases.

### Do Zen Battery or Calculator with 1000 button have ads?

Calculator with 1000 button shows ads; Zen Battery does not.

### Which is updated more often, Zen Battery or Calculator with 1000 button?

Zen Battery ships an update every 18 months, and Calculator with 1000 button every 2 months. Most recently, Zen Battery was updated on November 6, 2026 and Calculator with 1000 button on November 5, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*