# Graph Calc Plus vs X2Power Marine

The clearest difference is price: X2Power Marine at Free against Graph Calc Plus's $2.99. X2Power Marine also leads on update cadence (every 2 months vs every 39 months) and iOS requirement (12.0 vs 14.0). On ads, in-app purchases and device support there is nothing between them.

X2Power Marine is free to download; Graph Calc Plus costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Graph Calc Plus ships an update every 39 months, X2Power Marine every 2 months. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Graph Calc Plus | X2Power Marine |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | — | **[3.1 (15 ratings)](https://appshunter.io/ios/app/x2power-marine/id6446151584/reviews)** |
| Number of ratings | — | **15** |
| Positive reviews | — | 44.4% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 39 months | **Every 2 months** |
| Monetization | — | Free |
| Size | 1 MB | 38 MB |
| Requires iOS | 14.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Heng Jia Liang](https://appshunter.io/developer/1532000635) | [Batteries Plus LLC](https://appshunter.io/developer/1181988229) |

## What reviewers say

### Graph Calc Plus

[App page](https://appshunter.io/ios/app/graph-calc-plus/id1612916130)

**Features:** macOS Compatibility

**In-app purchases:** none


### X2Power Marine

[App page](https://appshunter.io/ios/app/x2power-marine/id6446151584)

Monitor your X2Power Lithium Marine battery's status in real-time. This app provides vital information like voltage, current, capacity, and charge status via Bluetooth, enhancing battery safety and usability.

**Highlights:** Real-time voltage monitoring, Operating current and power display, Remaining battery capacity, Charging time estimation, Battery cycle count, Full Charge Capacity (FCC) data

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Graph Calc Plus free?

Graph Calc Plus costs $2.99, with no in-app purchases.

### Is X2Power Marine free?

X2Power Marine is free to download, with no in-app purchases.

### Do Graph Calc Plus or X2Power Marine have ads?

Neither Graph Calc Plus nor X2Power Marine shows ads.

### Which is updated more often, Graph Calc Plus or X2Power Marine?

Graph Calc Plus ships an update every 39 months, and X2Power Marine every 2 months. Most recently, Graph Calc Plus was updated on October 27, 2026 and X2Power Marine on October 24, 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.*