# Sleep Cycle Calculator vs Countdown

The clearest difference is ads: Sleep Cycle Calculator at none against Countdown's shown. Sleep Cycle Calculator also leads on rating (4.7 vs 4.5) and review sentiment (71% vs 62%). Countdown's advantage is update cadence (every 3 weeks vs every 2 months) and ratings volume (103 vs 15). On price, in-app purchases, monetization model and device support 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 Countdown sells 23 in-app purchases, starting at $1.99 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 4.5. That said, the two scores are not equally well evidenced: Countdown has 103 ratings behind it against 15, so its average is the more settled of the two. Written reviews point the same way: 71% of Sleep Cycle Calculator's written reviews are positive against 62% of Countdown's.

Sleep Cycle Calculator ships an update every 2 months, Countdown every 3 weeks. The most recent releases landed on September 25, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Sleep Cycle Calculator | Countdown |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (15 ratings)](https://appshunter.io/ios/app/sleep-cycle-calculator-sounds/id1669183385/reviews)** | [4.5 (103 ratings)](https://appshunter.io/ios/app/countdown-countdown-widget/id6499182059/reviews) |
| Number of ratings | 15 | **103** |
| Positive reviews | **71.4% of reviews** | 61.8% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 4 MB | 184 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Phan Nhat Đang](https://appshunter.io/developer/1437390098) | [HK SHENGUANGYUAN TECH LIMITED](https://appshunter.io/developer/1851942593) |

## 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 |


### Countdown

[App page](https://appshunter.io/ios/app/countdown-countdown-widget/id6499182059)

Easily track important life events with a customizable countdown timer. Set reminders, add personal backgrounds, and view upcoming dates directly from your home or lock screen. Never miss a special moment again.

**Highlights:** Unlimited event countdowns, Customizable widget backgrounds, Home screen widgets, Lock screen widgets, Advance event reminders, Personalized countdown calendar, Password protection for events

**Features:** macOS Compatibility

**In-app purchases (23)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One week membership | $1.99 | per 7 days |
| One week membership | $1.99 | per 7 days |
| Monthly Member | $3.99 | per month |
| Monthly Member | $4.99 | per month |
| One week membership | $4.99 | per 7 days |
| One week membership | $5.99 | per 7 days |
| One week membership | $6.99 | per 7 days |
| One week membership | $6.99 | per 7 days |
| One week membership | $7.99 | per 7 days |
| One week membership | $9.99 | per 7 days |
| One week membership | $9.99 | per 7 days |
| one year membership | $19.99 | per year |
| one year membership | $29.99 | per year |
| one year membership | $39.99 | per year |
| one year membership | $47.99 | per year |
| one year membership | $69.99 | per year |
| Lifetime Member | $23.99 | one-time |
| Lifetime Member | $29.99 | one-time |
| Lifetime Member | $35.99 | one-time |
| Lifetime Member | $59.99 | one-time |
| Lifetime Member | $71.99 | one-time |
| Lifetime Member | $95.99 | one-time |
| Lifetime Member | $119.99 | one-time |

**What reviewers like**

- 👍 Easy to use
- ✨ Nice designs
- ✅ Useful for reminders
- 🎨 Customizable widgets
- 🚀 Fast loading

**What reviewers complain about**

- 💸 Expensive premium
- 💰 Forced subscription
- 😩 Constant ads
- 🗑️ Deletes events
- ❌ Not free

**Reported bugs**

- Widgets don't update
- Events deleted randomly
- App crashes
- App freezes on loading screen
- Countdowns disappear

**Requested features**

- Make widgets free
- Offer more free features
- Reduce premium cost
- Improve free tier functionality


## Frequently asked questions

### Is Sleep Cycle Calculator free?

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

### Is Countdown free?

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

### Which has better reviews, Sleep Cycle Calculator or Countdown?

Sleep Cycle Calculator is rated higher. Sleep Cycle Calculator averages 4.7 out of 5 from 15 ratings, while Countdown averages 4.5 from 103 ratings.

### Do Sleep Cycle Calculator or Countdown have ads?

Countdown shows ads; Sleep Cycle Calculator does not.

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

Sleep Cycle Calculator ships an update every 2 months, and Countdown every 3 weeks. Most recently, Sleep Cycle Calculator was updated on September 25, 2026 and Countdown on October 10, 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.*