# Proactis Timewriter App vs Sasol Solar Challenge

The clearest difference is update cadence: Sasol Solar Challenge at weekly against Proactis Timewriter App's every 15 months. Proactis Timewriter App's advantage is iOS requirement (12.2 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Proactis Timewriter App ships an update every 15 months, Sasol Solar Challenge weekly. Both last shipped on November 7, 2026.

## The numbers

| Metric | Proactis Timewriter App | Sasol Solar Challenge |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Weekly** |
| Size | 2 MB | 36 MB |
| Requires iOS | **12.2** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ESIZE](https://appshunter.io/developer/1102412913) | [SOUTH AFRICAN SOLAR EVENTS (PTY) LTD.](https://appshunter.io/developer/1472420838) |

## What reviewers say

### Proactis Timewriter App

[App page](https://appshunter.io/ios/app/proactis-timewriter-app/id1494155176)

**Features:** macOS Compatibility

**In-app purchases:** none


### Sasol Solar Challenge

[App page](https://appshunter.io/ios/app/sasol-solar-challenge/id1638534343)

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

**In-app purchases:** none


## Frequently asked questions

### Is Proactis Timewriter App free?

Proactis Timewriter App is free to download, with no in-app purchases.

### Is Sasol Solar Challenge free?

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

### Do Proactis Timewriter App or Sasol Solar Challenge have ads?

Neither Proactis Timewriter App nor Sasol Solar Challenge shows ads.

### Which is updated more often, Proactis Timewriter App or Sasol Solar Challenge?

Proactis Timewriter App ships an update every 15 months, and Sasol Solar Challenge weekly. Most recently, Proactis Timewriter App was updated on November 7, 2026 and Sasol Solar Challenge on November 7, 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.*