# EcoGPT vs Castograph

The clearest difference is chart position: EcoGPT at #62 against Castograph's unranked. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. EcoGPT sells 18 in-app purchases, starting at $5.99 per month and Castograph sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

EcoGPT ships an update weekly, Castograph every 4 days. The most recent releases landed on October 22, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | EcoGPT | Castograph |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (8.8K ratings)](https://appshunter.io/ios/app/ecogpt/id6756059656/reviews)** | — |
| Number of ratings | **8.8K** | — |
| Positive reviews | 77.2% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Weekly | **Every 4 days** |
| Monetization | Free with in-app purchases | — |
| Best chart rank | **#62** | — |
| Size | 185 MB | 49 MB |
| Requires iOS | **18.0** | 18.2 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [EcoGPT Inc](https://appshunter.io/developer/6785926865) | [CHANSU KIM](https://appshunter.io/developer/1680914977) |

## What reviewers say

### EcoGPT

[App page](https://appshunter.io/ios/app/ecogpt/id6756059656)

**Currently charting:** #62 Top Free · Productivity (US App Store)

This AI chatbot offers powerful writing, thinking, and creative assistance with a focus on reducing environmental impact. It provides efficient processing and transparent eco-tracking, allowing users to contribute to tree planting with their usage.

**Highlights:** AI chatbot for writing and ideation, Environmentally responsible AI processing, Eco-impact dashboard, Tree planting contributions, Unlimited chats (Premium), Image generation (Premium), Web search (Premium)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (18)**

| Purchase | Price | Billing |
| --- | --- | --- |
| EcoGPT Monthly Subscription | $5.99 | per month |
| EcoGPT Monthly Subscription. | $7.00 | per month |
| EcoGPT Monthly Subscription | $9.99 | per month |
| Monthly Subscription | $9.99 | per month |
| EcoGPT Yearly Subscription. | $9.99 | per year |
| EcoGPT Monthly Subscription. | $10.00 | per month |
| EcoGPT Monthly Subscription. | $10.00 | per month |
| EcoGPT Monthly Subscription. | $14.99 | per month |
| EcoGPT Monthly Subscription | $19.99 | per month |
| EcoGPT Monthly Subscription. | $19.99 | per month |
| EcoGPT Monthly Subscription. | $20.00 | per month |
| EcoGPT Monthly Subscription. | $24.99 | per month |
| EcoGPT Yearly Subscription. | $29.00 | per year |
| EcoGPT Yearly Subscription | $49.99 | per year |
| EcoGPT Yearly Subscription | $49.99 | per year |
| EcoGPT Yearly Subscription. | $59.99 | per year |
| EcoGPT Yearly Subscription | $69.99 | per year |
| EcoGPT Yearly Subscription | $99.99 | per year |


### Castograph

[App page](https://appshunter.io/ios/app/castograph-dance-formation/id6762937044)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $1.99 | per month |
| Pro Yearly | $19.99 | per year |


## Frequently asked questions

### Is EcoGPT free?

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

### Is Castograph free?

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

### Do EcoGPT or Castograph have ads?

Both EcoGPT and Castograph show ads.

### Which is updated more often, EcoGPT or Castograph?

EcoGPT ships an update weekly, and Castograph every 4 days. Most recently, EcoGPT was updated on October 22, 2026 and Castograph on October 10, 2026.

---

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