# ETEnergyWorld vs GreyMatter

The clearest difference is in-app purchases: ETEnergyWorld at none against GreyMatter's 2. GreyMatter's advantage is update cadence (every 8 days vs every 2 months). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. GreyMatter sells 2 in-app purchases, starting at $7.99 per month. ETEnergyWorld asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for ETEnergyWorld against 5.0 for GreyMatter. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

ETEnergyWorld ships an update every 2 months, GreyMatter every 8 days. The most recent releases landed on November 2, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | ETEnergyWorld | GreyMatter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/etenergyworld/id1193112143/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/greymatter/id6777464593/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 8 days** |
| Monetization | **Free** | Freemium |
| Size | 85 MB | 69 MB |
| Requires iOS | **16.1** | 16.4 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Times Internet Limited](https://appshunter.io/developer/427164656) | [Moksha Labs LLC](https://appshunter.io/developer/6777464595) |

## What reviewers say

### ETEnergyWorld

[App page](https://appshunter.io/ios/app/etenergyworld/id1193112143)

Stay updated on India's dynamic energy sector with curated news, expert analysis, and industry reports. Covers policy changes, investments, and renewable energy developments.

**Highlights:** Latest energy sector developments, Expert views on industry issues, Relevant news and analysis, Industry reports and slideshows, Daily newsletter summary

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

**In-app purchases:** none


### GreyMatter

[App page](https://appshunter.io/ios/app/greymatter/id6777464593)

Master AI with daily personalized briefings on news and research. Structured learning tracks guide you from fundamentals to advanced concepts with adaptive lessons and quizzes. Invest just ten minutes daily to truly understand and excel in artificial intelligence.

**Highlights:** Personalized AI news briefings, AI research updates, Structured learning tracks, Adaptive lessons and quizzes, Fundamentals to advanced concepts, Daily 10-minute learning

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $7.99 | per month |
| Pro Annual | $71.90 | per year |


## Frequently asked questions

### Is ETEnergyWorld free?

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

### Is GreyMatter free?

GreyMatter is free to download, with in-app purchases available.

### Which has better reviews, ETEnergyWorld or GreyMatter?

ETEnergyWorld and GreyMatter are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.

### Do ETEnergyWorld or GreyMatter have ads?

Neither ETEnergyWorld nor GreyMatter shows ads.

### Which is updated more often, ETEnergyWorld or GreyMatter?

ETEnergyWorld ships an update every 2 months, and GreyMatter every 8 days. Most recently, ETEnergyWorld was updated on November 2, 2026 and GreyMatter on November 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.*