Comparison

ChatGPT vs Lum

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

ChatGPT

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
Read full description

Introducing ChatGPT for iOS: OpenAI’s latest advancements at your fingertips. This official app is free, syncs your history across devices, and brings you the latest from OpenAI, including the new image generator. With ChatGPT in your pocket, you’ll find: · Image generation–Generate original images from a description, or transform existing ones with a few simple words. · Advanced Voice Mode–Tap the soundwave icon to have a real-time convo on the go. Settle a dinner table debate, or practice a new language. · Photo upload—Snap or upload a picture to transcribe a handwritten recipe or get info about a landmark. · Creative inspiration—Find custom birthday gift ideas or create a personalized greeting card. · Tailored advice—Talk through a tough situation, ask for a detailed travel itinerary, or get help crafting the perfect response. · Personalized learning—Explain electricity to a dinosaur-loving kid or easily brush up yourself on a historic event. · Professional input—Brainstorm marketing copy or map out a business plan. · Instant answers—Get recipe suggestions when you only have a few ingredients. Join hundreds of millions of users and try the app captivating the world. Download ChatGPT today. Terms of service & privacy policy: https://openai.com/policies/terms-of-use https://openai.com/policies/privacy-policy

About

Lum

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
Read full description

Create, Engage, and Excel with Lum - Your Personal Writing Assistant! Why Lum? Revolutionize your writing experience with Lum, the app designed to empower content creators, storytellers, and marketers. Craft compelling posts, create captivating stories, and communicate globally with seamless translations. Features: Limitless Creativity: With Lum, generate unlimited posts and scripts that resonate with your audience. From blog entries to video scripts, your content will always stand out. Personalized Content Ideas: Get a stream of customized content suggestions tailored to your style and preferences. Never hit a creative block again! Global Reach: Instantly translate your creations into multiple languages and connect with audiences worldwide. Your message knows no boundaries. Interactive Guides: Benefit from in-app tips and guides that help refine your writing skills and marketing strategies. Read more about our terms and conditions here: Terms of use: https://mastee.net/termsofuse Privacy policy: https://mastee.net/privacypolicy

Screenshots

ChatGPT4 screens
Lum4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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

Scorecard6 real differences · 5 level
ChatGPT versus Lum: the parameters behind the verdict, then further details
ParameterChatGPTLum
PriceFreeFree
Rating4.8 (12M ratings) — better3.8 (4 ratings)
Positive reviews71.1% of reviews — better20.0% of reviews
Number of ratings12M — better4
Update frequencyWeeklyEvery 5 days — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
Best chart rank#1 — better—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.015.0 — better
Further details — not scored
Size298 MB39 MB
Age rating12+4+
DeveloperOpenAI OpCo, LLCMaksim Nechaev

Customer experience

ChatGPT

All ratings12,107,041 ratings
Positive95.9%
Neutral1.2%
Negative2.9%
Written reviews27,737 reviews
Positive71.1%
Neutral4.3%
Negative24.6%

Lum

All ratings3 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews5 reviews
Positive20.0%
Neutral0.0%
Negative80.0%

Bugs and requests

ChatGPT

Reported bugs

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

Requested features

5 requests
  • 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

Not enough reviews yet to summarise bugs or requests.

In-app purchases

9 purchases

ChatGPT

Subscriptions6
  • ChatGPT Go$8.001 Month
  • ChatGPT Plus$19.991 Month
  • ChatGPT Pro 100$100.001 Month
Show 3 more
  • ChatGPT Pro 200$200.001 Month
  • ChatGPT Plus$200.001 Year
  • ChatGPT Pro 500$500.001 Month
One-time3
  • 100 Credits$4.00
  • 500 Credits$20.00
  • 1000 Credits$40.00
3 purchases

Lum

Subscriptions3
  • Monthly subscription$8.991 Month
  • Annual, 50%, 1-week free7 Days trial$29.991 Year
  • Annual, 1-week free7 Days trial$59.991 Year

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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