# Thermals vs zero

The clearest difference is ads: Thermals at none against zero's shown. Thermals also leads on review sentiment (83% vs 50%) and rating (4.5 vs 4.3). zero's advantage is update cadence (every 2 months vs every 3 months) and iOS requirement (15.6 vs 18.6). On price, in-app purchases, chart position and device support there is nothing between them.

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

Thermals holds the better App Store score, 4.5 against 4.3. That said, the two scores are not equally well evidenced: Thermals has 28 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 83% of Thermals's written reviews are positive against 50% of zero's.

Thermals ships an update every 3 months, zero every 2 months. The most recent releases landed on September 22, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Thermals | zero |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (28 ratings)](https://appshunter.io/ios/app/thermals/id1567050762/reviews)** | [4.3 (4 ratings)](https://appshunter.io/ios/app/zero-z1/id6479646791/reviews) |
| Number of ratings | **28** | 4 |
| Positive reviews | **83.3% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | **Free** | Ad-supported |
| Best chart rank | **#131** | #202 |
| Size | 3 MB | 37 MB |
| Requires iOS | 18.6 | **15.6** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [George Garside](https://appshunter.io/developer/815604170) | [Mohammad Alipour Behzadi](https://appshunter.io/developer/1711941412) |

## What reviewers say

### Thermals

[App page](https://appshunter.io/ios/app/thermals/id1567050762)

**Currently charting:** #131 Top Free · Developer Tools (US App Store)

Monitor your device's thermal state and processor activity to diagnose performance issues. Understand why your phone might be running slowly, charging slowly, or have reduced brightness due to overheating. Export data for further analysis with other development tools.

**Highlights:** Displays device thermal state, Shows active processor count, Monitors device uptime, Troubleshoots performance issues, Helps diagnose slow charging, Identifies brightness limitations, Exports raw data for analysis

**Features:** Apple Watch app

**In-app purchases:** none


### zero

[App page](https://appshunter.io/ios/app/zero-z1/id6479646791)

**Currently charting:** #202 Top Free · Developer Tools (US App Store)

Control your burglar alarm remotely via SMS commands. This application simplifies sending instructions to your alarm system without manual text input.

**Highlights:** Remote alarm control, SMS command sending, Multiple location support, Simplified interface, No manual text typing

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

**In-app purchases:** none


## Frequently asked questions

### Is Thermals free?

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

### Is zero free?

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

### Which has better reviews, Thermals or zero?

Thermals is rated higher. Thermals averages 4.5 out of 5 from 28 ratings, while zero averages 4.3 from 4 ratings.

### Do Thermals or zero have ads?

zero shows ads; Thermals does not.

### Which is updated more often, Thermals or zero?

Thermals ships an update every 3 months, and zero every 2 months. Most recently, Thermals was updated on September 22, 2026 and zero on September 21, 2026.

### Which is more popular, Thermals or zero?

Thermals currently peaks at #131 in the App Store charts, and zero at #202. Chart position reflects recent download velocity rather than total install base.

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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.*