# Sleep Cycle Calculator vs Ring Sizer

The clearest difference is rating: Sleep Cycle Calculator at 4.7 against Ring Sizer's 2.7. Sleep Cycle Calculator also leads on ads (none vs shown) and review sentiment (71% vs 50%). On price, ratings volume, update cadence and in-app purchases there is nothing between them.

Both are free to download. Sleep Cycle Calculator sells 3 in-app purchases, starting at $1.99 per month and Ring Sizer sells 2 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Sleep Cycle Calculator holds the better App Store score, 4.7 against 2.7. Both are backed by a comparable volume of ratings — 15 and 14 respectively. Written reviews point the same way: 71% of Sleep Cycle Calculator's written reviews are positive against 50% of Ring Sizer's.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 7, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Sleep Cycle Calculator | Ring Sizer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (15 ratings)](https://appshunter.io/ios/app/sleep-cycle-calculator-sounds/id1669183385/reviews)** | [2.7 (14 ratings)](https://appshunter.io/ios/app/ring-sizer-ring-fing/id6444123111/reviews) |
| Number of ratings | **15** | 14 |
| Positive reviews | **71.4% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 4 MB | 17 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Phan Nhat Đang](https://appshunter.io/developer/1437390098) | [Irina Scelcunova](https://appshunter.io/developer/1737748446) |

## What reviewers say

### Sleep Cycle Calculator

[App page](https://appshunter.io/ios/app/sleep-cycle-calculator-sounds/id1669183385)

This app helps you improve sleep habits by calculating optimal sleep and wake times based on sleep cycles and desired duration. It also offers sleep sounds to aid in falling asleep faster and achieving deeper rest.

**Highlights:** Sleep cycle calculation, Optimal sleep duration calculation, Variety of sleep sounds, User-friendly interface, Subscription for unlimited access

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1-Month Subscription | $1.99 | per month |
| 1-Year Subscription | $9.99 | per year |
| Unlock all features | $17.99 | one-time |


### Ring Sizer

[App page](https://appshunter.io/ios/app/ring-sizer-ring-fing/id6444123111)

Accurately measure rings, jewelry, and other objects using advanced AR technology and a digital ruler. Supports multiple international sizing systems for precise fitting.

**Highlights:** Measure rings and jewelry with AR, Digital ruler for object measurement, Supports US, AU/GB, EU/ISO, JP/CN sizing, AR tape measure functionality, Precise diamond/gemstone ring sizing

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ring Sizer | $3.99 | per 7 days |
| Ring Fing Vip for three months | $9.99 | per 3 months |


## Frequently asked questions

### Is Sleep Cycle Calculator free?

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

### Is Ring Sizer free?

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

### Which has better reviews, Sleep Cycle Calculator or Ring Sizer?

Sleep Cycle Calculator is rated higher. Sleep Cycle Calculator averages 4.7 out of 5 from 15 ratings, while Ring Sizer averages 2.7 from 14 ratings.

### Do Sleep Cycle Calculator or Ring Sizer have ads?

Ring Sizer shows ads; Sleep Cycle Calculator does not.

### Which is updated more often, Sleep Cycle Calculator or Ring Sizer?

Sleep Cycle Calculator ships an update every 2 months, and Ring Sizer every 2 months. Most recently, Sleep Cycle Calculator was updated on November 7, 2026 and Ring Sizer on November 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.*