# Marine Docker vs PV Calculator.

The clearest difference is in-app purchases: Marine Docker at none against PV Calculator.'s 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. PV Calculator. sells 1 one-off in-app purchase. Marine Docker asks for nothing beyond the download.

Marine Docker ships an update every 4 months, PV Calculator. every 7 months. The most recent releases landed on October 27, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Marine Docker | PV Calculator. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/pv-calculator/id6758427564/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 7 months |
| Monetization | — | Free with in-app purchases |
| Size | 61 MB | 52 MB |
| Requires iOS | 13.4 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Kontis d.o.o.](https://appshunter.io/developer/1745258669) | [Nanjibhai Gorasiya](https://appshunter.io/developer/1834066312) |

## What reviewers say

### Marine Docker

[App page](https://appshunter.io/ios/app/marine-docker/id6502378616)

**Features:** macOS Compatibility

**In-app purchases:** none


### PV Calculator.

[App page](https://appshunter.io/ios/app/pv-calculator/id6758427564)

This tool simplifies solar photovoltaic system design and analysis for professionals and students. It offers a comprehensive Energy Hub with multiple calculators, providing instant results, visual charts, and clear insights for efficient PV system planning and optimization.

**Highlights:** Energy Hub with multiple solar calculators, Calculate solar panel power output, Analyze energy generation (daily, monthly, yearly), Design solar array size, Calculate system voltage and configuration, Instant calculation results, Visual charts and performance summaries

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime premium | $9.99 | one-time |


## Frequently asked questions

### Is Marine Docker free?

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

### Is PV Calculator. free?

PV Calculator. is free to download, with in-app purchases available.

### Do Marine Docker or PV Calculator. have ads?

Neither Marine Docker nor PV Calculator. shows ads.

### Which is updated more often, Marine Docker or PV Calculator.?

Marine Docker ships an update every 4 months, and PV Calculator. every 7 months. Most recently, Marine Docker was updated on October 27, 2026 and PV Calculator. on October 17, 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.*