# PV Calculator vs PhaseStor

The clearest difference is price: PhaseStor at Free against PV Calculator's $1.99. PhaseStor also leads on rating (5.0 vs 4.0) and update cadence (every 2 weeks vs every 8 months). PV Calculator's advantage is ratings volume (13 vs 1). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

PhaseStor is free to download; PV Calculator costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

PhaseStor holds the better App Store score, 5.0 against 4.0. That said, the two scores are not equally well evidenced: PV Calculator has 13 ratings behind it against 1, so its average is the more settled of the two.

PV Calculator ships an update every 8 months, PhaseStor every 2 weeks. The most recent releases landed on October 12, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | PV Calculator | PhaseStor |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [4.0 (13 ratings)](https://appshunter.io/ios/app/pv-calculator-off-grid/id1219643642/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/phasestor/id6740872085/reviews)** |
| Number of ratings | **13** | 1 |
| Positive reviews | 42.9% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 2 weeks** |
| Monetization | Paid | **Free** |
| Size | 15 MB | 99 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Cristinel Bontas](https://appshunter.io/developer/645866051) | [Phasestor](https://appshunter.io/developer/1792010245) |

## What reviewers say

### PV Calculator

[App page](https://appshunter.io/ios/app/pv-calculator-off-grid/id1219643642)

This tool helps you calculate the necessary components for an off-grid photovoltaic system. It guides you through determining power consumption, available sunlight, and sizing solar arrays and battery banks.

**Highlights:** Battery bank sizing, Solar panel wattage calculation, Charge controller sizing, Power consumption determination, Sun hours analysis

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

**In-app purchases:** none


### PhaseStor

[App page](https://appshunter.io/ios/app/phasestor/id6740872085)

This app focuses on advanced thermal energy storage systems, aiming to reshape energy utilization for a sustainable future. It highlights eco-friendly water heating technology designed to revolutionize sustainable water heating.

**Highlights:** Advanced thermal energy storage, Eco-friendly water heating systems, Sustainable energy utilization, Revolutionary heating technology

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PV Calculator free?

PV Calculator costs $1.99, with no in-app purchases.

### Is PhaseStor free?

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

### Which has better reviews, PV Calculator or PhaseStor?

PhaseStor is rated higher. PV Calculator averages 4.0 out of 5 from 13 ratings, while PhaseStor averages 5.0 from 1 ratings.

### Do PV Calculator or PhaseStor have ads?

Neither PV Calculator nor PhaseStor shows ads.

### Which is updated more often, PV Calculator or PhaseStor?

PV Calculator ships an update every 8 months, and PhaseStor every 2 weeks. Most recently, PV Calculator was updated on October 12, 2026 and PhaseStor on October 5, 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.*