# Imperfect vs SleepStack

The clearest difference is in-app purchases: Imperfect at none against SleepStack's 3. Imperfect also leads on update cadence (every 3 days vs every 10 days) and rating (4.2 vs 4.0). On price, ads and device support there is nothing between them.

Both are free to download. SleepStack sells 3 in-app purchases, starting at $4.99 per 7 days. Imperfect asks for nothing beyond the download.

Imperfect holds the better App Store score, 4.2 against 4.0. That said, the two scores are not equally well evidenced: Imperfect has 27 ratings behind it against 4, so its average is the more settled of the two.

Imperfect ships an update every 3 days, SleepStack every 10 days. The most recent releases landed on October 12, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Imperfect | SleepStack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (27 ratings)](https://appshunter.io/ios/app/imperfect-training-coach/id6758960072/reviews)** | [4.0 (4 ratings)](https://appshunter.io/ios/app/sleepstack-sleep-protocol/id6760767864/reviews) |
| Number of ratings | **27** | 4 |
| Positive reviews | 85.2% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 10 days |
| Monetization | **Free** | Free with in-app purchases |
| Size | 66 MB | 49 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Imperfect Wellness, Inc](https://appshunter.io/developer/1876002510) | [NUNE LLC](https://appshunter.io/developer/1838850912) |

## What reviewers say

### Imperfect

[App page](https://appshunter.io/ios/app/imperfect-training-coach/id6758960072)

This app creates personalized training and wellness plans that adapt to your unique life circumstances, from weather to social events. It offers actionable recommendations, including nutrition and recovery advice, to help you achieve your fitness goals.

**Highlights:** Adaptive training programs, Actionable recommendations, Weather-aware planning, Nutrition and recovery advice, Integration with fitness wearables, Personalized wellness journey

**Features:** Vision Pro support

**In-app purchases:** none


### SleepStack

[App page](https://appshunter.io/ios/app/sleepstack-sleep-protocol/id6760767864)

This app helps you build better sleep habits with guided routines, sleep tracking, and relaxation techniques. It monitors your sleep environment and provides feedback to improve your rest and morning recovery. Protect your sleep from phone distractions with app blocking features.

**Highlights:** Personalized bedtime routine builder, Sleep Score and insights tracking, Guided relaxation techniques, App blocking for sleep protection, Sleep environment monitoring, Morning energy and recovery feedback, Gamified sleep habit tracking

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SleepStack Pro weekly | $4.99 | per 7 days |
| SleepStack Pro Yearly | $29.99 | per year |
| SleepStack Yearly | $59.99 | per year |


## Frequently asked questions

### Is Imperfect free?

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

### Is SleepStack free?

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

### Which has better reviews, Imperfect or SleepStack?

Imperfect is rated higher. Imperfect averages 4.2 out of 5 from 27 ratings, while SleepStack averages 4.0 from 4 ratings.

### Do Imperfect or SleepStack have ads?

Neither Imperfect nor SleepStack shows ads.

### Which is updated more often, Imperfect or SleepStack?

Imperfect ships an update every 3 days, and SleepStack every 10 days. Most recently, Imperfect was updated on October 12, 2026 and SleepStack on October 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.*