# PV Solar Forecast vs Keystone

The clearest difference is in-app purchases: Keystone at none against PV Solar Forecast's 4. Keystone also leads on ads (none vs shown) and update cadence (fortnightly vs every 3 months). PV Solar Forecast's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 17.0). On price there is nothing between them.

Both are free to download. PV Solar Forecast sells 2 in-app purchases, starting at $9.99 per month. Keystone asks for nothing beyond the download.

PV Solar Forecast ships an update every 3 months, Keystone fortnightly. The most recent releases landed on October 14, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | PV Solar Forecast | Keystone |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (43 ratings)](https://appshunter.io/ios/app/pv-solar-forecast/id1496274910/reviews)** | — |
| Number of ratings | **43** | — |
| Positive reviews | 21.2% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Fortnightly** |
| Monetization | Free with in-app purchases | — |
| Size | 46 MB | 4 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Igor Ilijovski](https://appshunter.io/developer/1492982127) | [Ionut Mocanu](https://appshunter.io/developer/1648541447) |

## What reviewers say

### PV Solar Forecast

[App page](https://appshunter.io/ios/app/pv-solar-forecast/id1496274910)

Predict your solar power generation for up to 360 hours and 15 days ahead. This tool helps you save energy and money by planning appliance usage, EV charging, and understanding your system's output. It also provides detailed weather forecasts and data export options.

**Highlights:** 360-hour solar production forecast, 15-day daily solar production forecast, 12-month monthly generation forecasts, CSV data export, Current power estimation, Global location forecasting, Hourly weather forecast

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock all features | $9.99 | per month |
| Unlock all features | $39.99 | per year |


### Keystone

[App page](https://appshunter.io/ios/app/keystone-project-tracker/id6760302143)

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

**In-app purchases:** none


## Frequently asked questions

### Is PV Solar Forecast free?

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

### Is Keystone free?

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

### Do PV Solar Forecast or Keystone have ads?

PV Solar Forecast shows ads; Keystone does not.

### Which is updated more often, PV Solar Forecast or Keystone?

PV Solar Forecast ships an update every 3 months, and Keystone fortnightly. Most recently, PV Solar Forecast was updated on October 14, 2026 and Keystone on October 7, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*