Ruler App vs Battery Grapher
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Ruler App
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.
- Imperial and metric scale switching
- Adjustable ruler height
- Color scheme customization
- Apple Watch compatibility
- Switchable ruler scales
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Turn your iPhone or Apple Watch into a ruler and measure the scale of any small thing. Features: - switch between imperial and metric scales - adjust the height of the ruler for direct comparison - different color schemes - switchable ruler scales Apple Watch App: - switch between imperial and metric scales - switchable ruler scales
Battery Grapher
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.
- Historical battery level graphing
- Smart future battery predictions
- Low energy consumption design
- Customizable battery notifications
- Supports all complications and widget sizes
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Battery Grapher graphs your historical battery levels and learns your habits to make smart predictions on what your future battery levels will be. Developed specifically with energy consumption in mind, Battery Grapher has almost no impact on battery life. SMART PREDICTIONS Battery Grapher uses historical battery levels to intelligently predict what your battery level will be throughout the rest of the day, allowing you to plan when to next charge your device. The longer you have Battery Grapher installed, the more accurate future battery level predictions will be. LOW ENERGY CONSUMPTION Battery Grapher is made for people who want to extend the battery life, meaning that low energy usage is a priority. The app runs a background task only once an hour, and doesn't require a network connection, which keeps energy consumption extremely low. CUSTOMIZABLE NOTIFICATIONS Battery Grapher allows you to set notifications that fit your needs. You can get the app to notify you when you battery drops below a preset percentage, or if you only have a certain number of hours left before your battery runs out. (currently only available on watchOS) ALL COMPLICATIONS & WIDGET SIZES SUPPORTED Battery Grapher supports all complications & widget sizes. Complications can show hours before needing to charge, or battery %. Both complications and widgets are customizable from within the app.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Ruler App | Battery Grapher |
|---|---|---|
| Price | $0.99 — better | $1.99 |
| Rating | 2.6 (5 ratings) | 4.3 (155 ratings) — better |
| Positive reviews | 0.0% of reviews | 61.2% of reviews — better |
| Number of ratings | 5 | 155 — better |
| Update frequency | Every 11 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod, Apple Watch — better |
| Requires iOS | 12.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 2 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Piet Jonas | Joshua Bird |
Customer experience
Ruler App
Battery Grapher
Bugs and requests
Ruler App
Not enough reviews yet to summarise bugs or requests.
Battery Grapher
Reported bugs
18 issues- 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
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- Charge-discharge cycle recognition fails (shows straight lines)
- App crashes on iPad and certain iOS versions
- Complication capped at 47-48 hours on Apple Watch Ultra
- Incorrect battery readings after full charge
- Notifications arrive delayed or not at all
- App shows charging when device is not charging
- Data loss after watch pairing/unpairing
- Graphs display inverted or incorrect usage patterns
- 24-hour time format setting non-functional
- Text cutoff on complication at bottom of watch face
- Accuracy never improves beyond 'bad' status
- App requires manual watch face switching to update
- Predictions wildly inaccurate on newer Apple Watch models
Requested features
18 requests- 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)
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- 24-hour time format option
- Charging time estimation while device is charging
- Notifications for full charge completion
- Battery percentage display in widgets
- MacBook app version
- App-specific battery drain identification
- Historical data view (weekly/monthly)
- Cross-device battery information (iPhone battery on Watch, etc.)
- Landscape mode graph expansion
- Multiple widget size options
- Portuguese/Brazilian Portuguese localization
- Manual dark mode toggle for iPhone
- Watch complication for multiple stacks
In-app purchases
Ruler App
No in-app purchases
Battery Grapher
No in-app purchases
Questions
Is Ruler App free?
Is Battery Grapher free?
Which has better reviews, Ruler App or Battery Grapher?
Do Ruler App or Battery Grapher have ads?
Which is updated more often, Ruler App or Battery Grapher?
Other comparisons
