# Solar power 2.0 vs E

The clearest difference is price: Solar power 2.0 at Free against E's $49.99. On update cadence, ads, in-app purchases and device support there is nothing between them.

Solar power 2.0 is free to download; E costs $49.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Solar power 2.0 ships an update every 7 months, E every 11 months. The most recent releases landed on July 5, 2026 and August 28, 2026 respectively.

## The numbers

| Metric | Solar power 2.0 | E |
| --- | --- | --- |
| Price | **Free** | $49.99 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 7 months** | Every 11 months |
| Monetization | Free | — |
| Size | 48 MB | 26 MB |
| Requires iOS | **14.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [凌 郭](https://appshunter.io/developer/1677727665) | [Axiomatic Technologies Corporation](https://appshunter.io/developer/1719190927) |

## What reviewers say

### Solar power 2.0

[App page](https://appshunter.io/ios/app/solar-power-20/id6446795253)

This app allows Bluetooth remote control for solar charge controllers. Monitor solar power generation data in real-time and set charging parameters for different battery types. It does not collect user data and is free to use with no ads.

**Highlights:** Bluetooth remote control, Real-time solar data monitoring, Customizable charging parameters, Battery type settings, Operation mode selection, No user data collection

**Features:** macOS Compatibility

**In-app purchases:** none


### E

[App page](https://appshunter.io/ios/app/e-write-nfc/id6473560354)

**In-app purchases:** none


## Frequently asked questions

### Is Solar power 2.0 free?

Solar power 2.0 is free to download, with no in-app purchases.

### Is E free?

E costs $49.99, with no in-app purchases.

### Do Solar power 2.0 or E have ads?

Neither Solar power 2.0 nor E shows ads.

### Which is updated more often, Solar power 2.0 or E?

Solar power 2.0 ships an update every 7 months, and E every 11 months. Most recently, Solar power 2.0 was updated on July 5, 2026 and E on August 28, 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.*