# Zing Sessions vs Sleep Ledger

The clearest difference is rating: Sleep Ledger at 5.0 against Zing Sessions's 2.9. Sleep Ledger also leads on update cadence (every 8 days vs every 4 months). Zing Sessions's advantage is in-app purchases (none vs 3) and ratings volume (17 vs 2). On price, ads and device support there is nothing between them.

Both are free to download. Sleep Ledger sells 3 in-app purchases, starting at $4.99 per month. Zing Sessions asks for nothing beyond the download.

Sleep Ledger holds the better App Store score, 5.0 against 2.9. That said, the two scores are not equally well evidenced: Zing Sessions has 17 ratings behind it against 2, so its average is the more settled of the two.

Zing Sessions ships an update every 4 months, Sleep Ledger every 8 days. The most recent releases landed on October 2, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Zing Sessions | Sleep Ledger |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.9 (17 ratings)](https://appshunter.io/ios/app/zing-sessions/id1145414934/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/sleep-ledger-debt-tracker/id6759897307/reviews)** |
| Number of ratings | **17** | 2 |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 8 days** |
| Monetization | **Free** | Freemium |
| Size | 824 MB | 8 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 17+ | 12+ |
| Developer | [Zing Performance Ltd](https://appshunter.io/developer/735387177) | [Takumi Kanzaki](https://appshunter.io/developer/1820952468) |

## What reviewers say

### Zing Sessions

[App page](https://appshunter.io/ios/app/zing-sessions/id1145414934)

Enhance cognitive and physical performance with personalized exercises designed to boost brainpower. This mobile app offers on-screen skill tests and physical activities based on neuroscience research to improve attention, memory, and coordination.

**Highlights:** On-the-go accessibility, Personalized exercise programs, Cognitive, emotional, and social performance training, Improved attention and memory, Enhanced coordination and spatial awareness, Stress management benefits

**In-app purchases:** none


### Sleep Ledger

[App page](https://appshunter.io/ios/app/sleep-ledger-debt-tracker/id6759897307)

This app analyzes your sleep data from Apple Health to calculate your sleep debt and provides a personalized daily plan to help you recover. It offers insights into sleep quality and a clear path to reaching your sleep goals.

**Highlights:** Sleep debt calculation, Personalized recovery plan, Quality-weighted sleep score, Calendar-based schedule, Lock screen widgets, On-device processing, Siri Shortcuts

**Features:** Apple Watch app

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $4.99 | per month |
| Annual | $29.99 | per year |
| Lifetime | $79.99 | one-time |


## Frequently asked questions

### Is Zing Sessions free?

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

### Is Sleep Ledger free?

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

### Which has better reviews, Zing Sessions or Sleep Ledger?

Sleep Ledger is rated higher. Zing Sessions averages 2.9 out of 5 from 17 ratings, while Sleep Ledger averages 5.0 from 2 ratings.

### Do Zing Sessions or Sleep Ledger have ads?

Neither Zing Sessions nor Sleep Ledger shows ads.

### Which is updated more often, Zing Sessions or Sleep Ledger?

Zing Sessions ships an update every 4 months, and Sleep Ledger every 8 days. Most recently, Zing Sessions was updated on October 2, 2026 and Sleep Ledger on October 8, 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.*