# Ruler App vs Battery Grapher

The clearest difference is review sentiment: Battery Grapher at 61% against Ruler App's 0%. Battery Grapher also leads on rating (4.3 vs 2.6) and update cadence (every 2 months vs every 11 months). Ruler App's advantage is price ($0.99 vs $1.99) and iOS requirement (12.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

Ruler App costs $0.99 and Battery Grapher $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Battery Grapher holds the better App Store score, 4.3 against 2.6. That said, the two scores are not equally well evidenced: Battery Grapher has 155 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 0% of Ruler App's written reviews are positive against 61% of Battery Grapher's.

Ruler App ships an update every 11 months, Battery Grapher every 2 months. The most recent releases landed on October 22, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Ruler App | Battery Grapher |
| --- | --- | --- |
| Price | **$0.99** | $1.99 |
| Rating | [2.6 (5 ratings)](https://appshunter.io/ios/app/ruler-app/id303731879/reviews) | **[4.3 (155 ratings)](https://appshunter.io/ios/app/battery-grapher/id1498632956/reviews)** |
| Number of ratings | 5 | **155** |
| Positive reviews | 0.0% of reviews | **61.2% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 2 months** |
| Monetization | Paid | **Free** |
| Size | 2 MB | 5 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod, Apple Watch | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Piet Jonas](https://appshunter.io/developer/288060167) | [Joshua Bird](https://appshunter.io/developer/1549690243) |

## What reviewers say

### Ruler App

[App page](https://appshunter.io/ios/app/ruler-app/id303731879)

Transform your iPhone or Apple Watch into a precise measuring tool. Easily switch between imperial and metric units and adjust the ruler's height for direct comparisons. Customize your experience with different color schemes.

**Highlights:** Imperial and metric scale switching, Adjustable ruler height, Color scheme customization, Apple Watch compatibility, Switchable ruler scales

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


### Battery Grapher

[App page](https://appshunter.io/ios/app/battery-grapher/id1498632956)

This app tracks your device's battery usage over time and uses your historical data to predict future battery levels. It's designed for low energy consumption and offers customizable notifications to help you manage charging times.

**Highlights:** Historical battery level graphing, Smart future battery predictions, Low energy consumption design, Customizable battery notifications, Supports all complications and widget sizes

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 💡 Innovative battery prediction feature
- ⌚ Accurate Apple Watch complication display
- 📊 Detailed battery usage analytics and graphs
- 🎯 Learns usage patterns over time for better accuracy
- 🔋 Shows hours remaining instead of just percentage

**What reviewers complain about**

- 🐛 Complication fails to update frequently
- ❌ Widget missing or not appearing on installation
- 🔴 Inaccurate battery predictions, especially on newer devices
- ⏰ Updates only once per hour, causing stale data
- 📉 Accuracy takes weeks to improve on Apple Watch

**Reported bugs**

- Widget not displaying on initial installation
- Complication shows stale data and doesn't refresh automatically
- Battery percentage stuck at incorrect values (e.g., 73%, 68%)
- Accuracy status fluctuates rapidly between good and bad
- Missing data warnings despite app being in dock

**Requested features**

- Watch complication for Smart Stack (watchOS 10+)
- Support for Apple Watch Ultra with correct 36-hour battery display
- Low power mode detection and separate prediction profiles
- Force refresh button in app
- More frequent update intervals (user-configurable)


## Frequently asked questions

### Is Ruler App free?

Ruler App costs $0.99, with no in-app purchases.

### Is Battery Grapher free?

Battery Grapher costs $1.99, with no in-app purchases.

### Which has better reviews, Ruler App or Battery Grapher?

Battery Grapher is rated higher. Ruler App averages 2.6 out of 5 from 5 ratings, while Battery Grapher averages 4.3 from 155 ratings.

### Do Ruler App or Battery Grapher have ads?

Neither Ruler App nor Battery Grapher shows ads.

### Which is updated more often, Ruler App or Battery Grapher?

Ruler App ships an update every 11 months, and Battery Grapher every 2 months. Most recently, Ruler App was updated on October 22, 2026 and Battery Grapher on October 27, 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.*