# OTPL Solar vs Solar Calculators

The clearest difference is price: OTPL Solar at Free against Solar Calculators's $3.99. OTPL Solar also leads on update cadence (every 3 weeks vs every 6 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

OTPL Solar is free to download; Solar Calculators costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

OTPL Solar ships an update every 3 weeks, Solar Calculators every 6 months. The most recent releases landed on October 26, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | OTPL Solar | Solar Calculators |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | — | **[2.5 (2 ratings)](https://appshunter.io/ios/app/solar-calculators/id6464022036/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 6 months |
| Monetization | — | Paid |
| Size | 58 MB | 21 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [AHASOLAR TECHNOLOGIES LIMITED](https://appshunter.io/developer/1632224285) | [Kantaben Gorasiya](https://appshunter.io/developer/1640260396) |

## What reviewers say

### OTPL Solar

[App page](https://appshunter.io/ios/app/otpl-solar/id1489169580)

**In-app purchases:** none


### Solar Calculators

[App page](https://appshunter.io/ios/app/solar-calculators/id6464022036)

This app helps you transition to renewable energy by visualizing your environmental impact and energy needs. It provides custom panel recommendations and estimates your home's solar production potential using hyper-local data.

**Highlights:** Impact Tracker for carbon offset visualization, Smart Energy Estimates with hyper-local solar data, Tailored Design for custom panel recommendations, Visualize environmental impact, Predict home production potential

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is OTPL Solar free?

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

### Is Solar Calculators free?

Solar Calculators costs $3.99, with no in-app purchases.

### Do OTPL Solar or Solar Calculators have ads?

Neither OTPL Solar nor Solar Calculators shows ads.

### Which is updated more often, OTPL Solar or Solar Calculators?

OTPL Solar ships an update every 3 weeks, and Solar Calculators every 6 months. Most recently, OTPL Solar was updated on October 26, 2026 and Solar Calculators on October 13, 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.*