# LightFasting vs AIVOSYS

The clearest difference is price: AIVOSYS at Free against LightFasting's $0.99. AIVOSYS also leads on iOS requirement (12.0 vs 14.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

AIVOSYS is free to download; LightFasting costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

LightFasting ships an update every 2 months, AIVOSYS every 3 months. The most recent releases landed on September 14, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | LightFasting | AIVOSYS |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/lightfasting/id1576166369/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 83.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Paid | — |
| Size | 44 MB | 71 MB |
| Requires iOS | 14.0 | **12.0** |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [兴龙 张](https://appshunter.io/developer/1576162823) | [Aivolife Inc.](https://appshunter.io/developer/1663354983) |

## What reviewers say

### LightFasting

[App page](https://appshunter.io/ios/app/lightfasting/id1576166369)

This app offers a scientific approach to weight loss by guiding users through a slightly high-intensity diet. It includes tools for calorie conversion, calculating ideal weight, basal metabolic rate, and BMI, along with tracking weight changes and energy intake.

**Highlights:** High-intensity diet guidance, Calorie and Joule conversion, Standard weight calculator, Basal metabolic rate calculator, Body mass index calculator, Energy intake tracking, Weight change tracking

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

**In-app purchases:** none


### AIVOSYS

[App page](https://appshunter.io/ios/app/aivosys-client-portal/id1663570137)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is LightFasting free?

LightFasting costs $0.99, with no in-app purchases.

### Is AIVOSYS free?

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

### Do LightFasting or AIVOSYS have ads?

Neither LightFasting nor AIVOSYS shows ads.

### Which is updated more often, LightFasting or AIVOSYS?

LightFasting ships an update every 2 months, and AIVOSYS every 3 months. Most recently, LightFasting was updated on September 14, 2026 and AIVOSYS on September 9, 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.*