# Zempy vs Lean AI

The clearest difference is monetization model: Lean AI at free with in-app purchases against Zempy's subscription. Lean AI also leads on rating (4.6 vs 4.2) and review sentiment (75% vs 63%). Zempy's advantage is iOS requirement (13.0 vs 15.5). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Zempy sells 6 in-app purchases, starting at $9.99 per month and Lean AI sells 14 in-app purchases, starting at $0.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Lean AI holds the better App Store score, 4.6 against 4.2. Both are backed by a comparable volume of ratings — 38 and 84 respectively. Written reviews point the same way: 63% of Zempy's written reviews are positive against 75% of Lean AI's.

Both ship on a similar rhythm, roughly every 3 days. The most recent releases landed on August 31, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Zempy | Lean AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (38 ratings)](https://appshunter.io/ios/app/zempy/id6736821378/reviews) | **[4.6 (84 ratings)](https://appshunter.io/ios/app/lean-ai-calorie-tracker/id6737275965/reviews)** |
| Number of ratings | 38 | **84** |
| Positive reviews | 62.5% of reviews | **75.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 days | Every 3 days |
| Monetization | Subscription | **Free with in-app purchases** |
| Size | 71 MB | 69 MB |
| Requires iOS | **13.0** | 15.5 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Catalytic Venture, Inc.](https://appshunter.io/developer/1766813462) | [AI Star LLC](https://appshunter.io/developer/1775701825) |

## What reviewers say

### Zempy

[App page](https://appshunter.io/ios/app/zempy/id6736821378)

Effortlessly track your nutrition by simply taking a photo of your meal. Receive instant, detailed nutritional analysis to help you reach your fitness goals. This intuitive platform simplifies the process, offering insights to support your journey.

**Highlights:** AI-powered calorie tracking, Photo-based meal analysis, Personalized fitness plans, Detailed nutritional breakdown, Intuitive user interface

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $9.99 | per month |
| Monthly | $14.99 | per month |
| Yearly OneTimeOffer | $19.99 | per year |
| Yearly Subscription | $34.99 | per year |
| Yearly One-Time-Offer | $39.99 | per year |
| Yearly | $69.99 | per year |


### Lean AI

[App page](https://appshunter.io/ios/app/lean-ai-calorie-tracker/id6737275965)

Effortlessly track your nutrition and fitness with AI-powered meal analysis. Snap photos of your food or describe your meals for instant calorie and macro breakdowns. Log workouts to monitor your progress and simplify your health journey.

**Highlights:** Snap photos to track macros, Scan barcodes for nutrition info, Describe meals for AI analysis, Log weightlifting and cardio workouts, AI-powered nutrition estimation, Featured on TikTok

**In-app purchases (14)**

| Purchase | Price | Billing |
| --- | --- | --- |
| All Access for 1 Week | $0.99 | per 7 days |
| All Access for 1 Week | $5.99 | per 7 days |
| All Access for 1 Week | $7.99 | per 7 days |
| All access | $7.99 | per 7 days |
| All access | $7.99 | per 7 days |
| All Access for 1 Month | $9.99 | per month |
| All access for 1 Month | $14.99 | per month |
| All access for 1 Year | $19.99 | per year |
| All Access for 1 Year | $29.99 | per year |
| All Access for 1 Year | $29.99 | per year |
| All Access for 1 Year | $29.99 | per year |
| All Access for 1 Year | $39.99 | per year |
| All Access for 1 Year | $49.99 | per year |
| All Access for 1 Year | $49.99 | per year |


## Frequently asked questions

### Is Zempy free?

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

### Is Lean AI free?

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

### Which has better reviews, Zempy or Lean AI?

Lean AI is rated higher. Zempy averages 4.2 out of 5 from 38 ratings, while Lean AI averages 4.6 from 84 ratings.

### Do Zempy or Lean AI have ads?

Neither Zempy nor Lean AI shows ads.

### Which is updated more often, Zempy or Lean AI?

Zempy ships an update every 3 days, and Lean AI every 3 days. Most recently, Zempy was updated on August 31, 2026 and Lean AI on September 21, 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.*