# Norsk Guardian vs Spark Plug Reader

The clearest difference is in-app purchases: Norsk Guardian at none against Spark Plug Reader's 1. Spark Plug Reader's advantage is update cadence (every 2 days vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Spark Plug Reader sells 1 one-off in-app purchase. Norsk Guardian asks for nothing beyond the download.

Norsk Guardian ships an update every 2 months, Spark Plug Reader every 2 days. The most recent releases landed on October 12, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Norsk Guardian | Spark Plug Reader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (4 ratings)](https://appshunter.io/ios/app/norsk-guardian/id1660544401/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 days** |
| Monetization | Free | — |
| Size | 73 MB | 37 MB |
| Requires iOS | **15.1** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Norsk Inc.](https://appshunter.io/developer/1660544403) | [EVREN YUCEBAS](https://appshunter.io/developer/6782353474) |

## What reviewers say

### Norsk Guardian

[App page](https://appshunter.io/ios/app/norsk-guardian/id1660544401)

Monitor your boat's marine batteries and portable sonar batteries via Bluetooth. Receive real-time alerts for charge, voltage, and maintenance needs. Features Deep Sleep™ to prevent discharge and custom grouping for easy identification.

**Highlights:** Bluetooth connectivity, Real-time battery monitoring, Charge and voltage tracking, Maintenance alerts, Deep Sleep™ power disconnect, Custom battery grouping

**Features:** Vision Pro support

**In-app purchases:** none


### Spark Plug Reader

[App page](https://appshunter.io/ios/app/spark-plug-reader/id6805215335)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $4.99 | one-time |


## Frequently asked questions

### Is Norsk Guardian free?

Norsk Guardian is free to download, with no in-app purchases.

### Is Spark Plug Reader free?

Spark Plug Reader is free to download, with in-app purchases available.

### Do Norsk Guardian or Spark Plug Reader have ads?

Neither Norsk Guardian nor Spark Plug Reader shows ads.

### Which is updated more often, Norsk Guardian or Spark Plug Reader?

Norsk Guardian ships an update every 2 months, and Spark Plug Reader every 2 days. Most recently, Norsk Guardian was updated on October 12, 2026 and Spark Plug Reader on October 6, 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.*