# Savior Heat vs Ozlo Sleepbuds

The clearest difference is rating: Ozlo Sleepbuds at 4.7 against Savior Heat's 2.7. Ozlo Sleepbuds also leads on update cadence (weekly vs every 15 months) and ratings volume (2.8K vs 10). Savior Heat's advantage is review sentiment (80% vs 44%) and iOS requirement (13.0 vs 18.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Ozlo Sleepbuds holds the better App Store score, 4.7 against 2.7. That said, the two scores are not equally well evidenced: Ozlo Sleepbuds has 2.8K ratings behind it against 10, so its average is the more settled of the two. Written reviews complicate that: 80% of Savior Heat's written reviews are positive against 44% of Ozlo Sleepbuds's, so the app with the better star average is not the one people write more warmly about.

Savior Heat ships an update every 15 months, Ozlo Sleepbuds weekly. Both last shipped on November 3, 2026.

## The numbers

| Metric | Savior Heat | Ozlo Sleepbuds |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (10 ratings)](https://appshunter.io/ios/app/savior-heat/id1570115467/reviews) | **[4.7 (2.8K ratings)](https://appshunter.io/ios/app/ozlo-sleepbuds/id6447005546/reviews)** |
| Number of ratings | 10 | **2.8K** |
| Positive reviews | **80.0% of reviews** | 44.4% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Weekly** |
| Monetization | Free | Free |
| Size | 25 MB | 275 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [伟 张](https://appshunter.io/developer/1525653329) | [Drowsy Digital Inc.](https://appshunter.io/developer/1679994355) |

## What reviewers say

### Savior Heat

[App page](https://appshunter.io/ios/app/savior-heat/id1570115467)

Control smart Bluetooth heated apparel and accessories. Adjust heating power, set constant temperatures, and manage countdown timers for personalized comfort.

**Highlights:** Control Bluetooth heated hats, clothes, gloves, socks, and insoles, Set heating gear power, Configure constant temperature settings, Manage heating countdown timers, Personalized comfort control

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

**In-app purchases:** none


### Ozlo Sleepbuds

[App page](https://appshunter.io/ios/app/ozlo-sleepbuds/id6447005546)

Tiny, comfortable earbuds designed for sleep. They offer all-night battery, noise blocking, and audio streaming. The companion app personalizes settings and provides sleep data reports.

**Highlights:** Ultra-comfy, low-profile design, All-night battery life (up to 14 hours), Noise blocking for disruptive sounds, Bluetooth audio streaming, Personal in-ear alarm, Sleep modes and timer, Sleep pattern and environmental insights

**Features:** iPhone Duo support

**In-app purchases:** none

**What reviewers like**

- 💤 Comfortable for side sleeping
- 🌙 Helps with sleep and tinnitus
- 🔕 Blocks out noise like snoring
- 🕰️ Alarm wakes user without disturbing partner
- 🔊 Good sound quality and variety of sleep sounds

**What reviewers complain about**

- 🔌 Battery life issues, drains quickly
- 📶 Bluetooth connectivity problems, frequent disconnections
- 🤖 Glitchy app with stability and UX problems
- 🔊 Limited volume control and sound options
- ⚠️ Mandatory updates cause disruptions

**Reported bugs**

- Earbuds not charging properly in case
- Sync issues between left and right earbuds
- App fails to connect or update firmware
- Sleep timer function is not working as expected

**Requested features**

- Allow custom sleep sounds and playlists
- Add phone-free mode to use without app
- Improve alarm features to work with phone alarms
- Expand sound library with more options like nature sounds


## Frequently asked questions

### Is Savior Heat free?

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

### Is Ozlo Sleepbuds free?

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

### Which has better reviews, Savior Heat or Ozlo Sleepbuds?

Ozlo Sleepbuds is rated higher. Savior Heat averages 2.7 out of 5 from 10 ratings, while Ozlo Sleepbuds averages 4.7 from 2.8K ratings.

### Do Savior Heat or Ozlo Sleepbuds have ads?

Neither Savior Heat nor Ozlo Sleepbuds shows ads.

### Which is updated more often, Savior Heat or Ozlo Sleepbuds?

Savior Heat ships an update every 15 months, and Ozlo Sleepbuds weekly. Most recently, Savior Heat was updated on November 3, 2026 and Ozlo Sleepbuds 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.*