# ChatGPT vs Lum

The clearest difference is review sentiment: ChatGPT at 71% against Lum's 20%. ChatGPT also leads on rating (4.8 vs 3.8) and ratings volume (12M vs 4). Lum's advantage is ads (none vs shown) and iOS requirement (15.0 vs 18.0). On price, update cadence, in-app purchases and monetization model there is nothing between them.

Both are free to download. ChatGPT sells 9 in-app purchases, starting at $8.00 per month and Lum sells 3 in-app purchases, starting at $8.99 per month. Whichever you choose, the download price is not the number that matters.

ChatGPT holds the better App Store score, 4.8 against 3.8. That said, the two scores are not equally well evidenced: ChatGPT has 12M ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 71% of ChatGPT's written reviews are positive against 20% of Lum's.

ChatGPT ships an update weekly, Lum every 5 days. The most recent releases landed on November 12, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | ChatGPT | Lum |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (12M ratings)](https://appshunter.io/ios/app/chatgpt/id6448311069/reviews)** | [3.8 (4 ratings)](https://appshunter.io/ios/app/lum-ai-social-content-creator/id6466619933/reviews) |
| Number of ratings | **12M** | 4 |
| Positive reviews | **71.1% of reviews** | 20.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Weekly | **Every 5 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | **#1** | — |
| Size | 298 MB | 39 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [OpenAI OpCo, LLC](https://appshunter.io/developer/1684349733) | [Maksim Nechaev](https://appshunter.io/developer/1707523809) |

## What reviewers say

### ChatGPT

[App page](https://appshunter.io/ios/app/chatgpt/id6448311069)

**Currently charting:** #1 Top Grossing · Productivity, #1 Top Grossing, #2 Top Free · Productivity, #4 Top Free (US App Store)

This AI assistant leverages advanced language models to generate text, images, and provide real-time conversational support. It offers features like image creation, voice interaction, and photo analysis for creative inspiration, personalized advice, and learning.

**Highlights:** Image generation from text descriptions, Advanced voice mode for real-time conversations, Photo upload for transcription and information retrieval, Creative inspiration for gifts and cards, Tailored advice for personal and professional tasks, Personalized learning explanations, Brainstorming for marketing and business plans

**Features:** Safari Extension, iMessage stickers, Vision Pro support, Fun Camera support, iPhone Duo support

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ChatGPT Go | $8.00 | per month |
| ChatGPT Plus | $19.99 | per month |
| ChatGPT Pro 100 | $100.00 | per month |
| ChatGPT Pro 200 | $200.00 | per month |
| ChatGPT Plus | $200.00 | per year |
| ChatGPT Pro 500 | $500.00 | per month |
| 100 Credits | $4.00 | one-time |
| 500 Credits | $20.00 | one-time |
| 1000 Credits | $40.00 | one-time |

**What reviewers like**

- 🚀 Powerful and versatile AI assistant
- 👍 Intuitive and user-friendly interface
- 🤖 Impressive conversational abilities
- 💡 Convenient mobile access to ChatGPT
- 🧠 Vast knowledge base on diverse topics

**What reviewers complain about**

- 🐛 Occasional inaccuracies or inconsistencies in responses
- 🔖 Limited to pre-2021 data, lacking real-time updates
- 🔒 Concerns about privacy and data usage
- 🔍 Difficulty in navigating and managing conversation history

**Reported bugs**

- Unexpected app crashes or freezes
- Issues with login and account verification
- Inconsistent performance on different iOS devices

**Requested features**

- Ability to integrate with other apps and services
- Support for voice commands and audio responses
- Enhanced search and organization of conversation history
- Customization options for the AI's personality and behavior
- Improved accessibility features for users with disabilities


### Lum

[App page](https://appshunter.io/ios/app/lum-ai-social-content-creator/id6466619933)

This AI-powered writing assistant helps users generate unlimited posts and scripts, offering personalized content ideas and instant translations for global reach. It also provides interactive guides to enhance writing and marketing skills.

**Highlights:** Unlimited post and script generation, Personalized content ideas, Instant multi-language translation, Interactive writing and marketing guides, Content creation for social media and video

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscription | $8.99 | per month |
| Annual, 50%, 1-week free | $29.99 | per year |
| Annual, 1-week free | $59.99 | per year |


## Frequently asked questions

### Is ChatGPT free?

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

### Is Lum free?

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

### Which has better reviews, ChatGPT or Lum?

ChatGPT is rated higher. ChatGPT averages 4.8 out of 5 from 12M ratings, while Lum averages 3.8 from 4 ratings.

### Do ChatGPT or Lum have ads?

ChatGPT shows ads; Lum does not.

### Which is updated more often, ChatGPT or Lum?

ChatGPT ships an update weekly, and Lum every 5 days. Most recently, ChatGPT was updated on November 12, 2026 and Lum on November 3, 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.*