# Heatzy FLAT vs Survoltage

The clearest difference is update cadence: Survoltage at monthly against Heatzy FLAT's every 8 months. Heatzy FLAT's advantage is iOS requirement (10.0 vs 13.0). On price, ads, in-app purchases 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.

Heatzy FLAT ships an update every 8 months, Survoltage monthly. The most recent releases landed on October 9, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Heatzy FLAT | Survoltage |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Monthly** |
| Monetization | Free | — |
| Size | 20 MB | 41 MB |
| Requires iOS | **10.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Heatzy](https://appshunter.io/developer/1139669586) | [Survoltage](https://appshunter.io/developer/1651266482) |

## What reviewers say

### Heatzy FLAT

[App page](https://appshunter.io/ios/app/heatzy-flat/id1486475906)

Control your connected towel dryer via Bluetooth to personalize heating schedules and optimize comfort. Save energy with custom programs, boost functions, and smart detection features.

**Highlights:** Bluetooth control, Customizable heating schedules, Energy saving modes, Boost function, Open window detection, Vacation mode

**Features:** macOS Compatibility

**In-app purchases:** none


### Survoltage

[App page](https://appshunter.io/ios/app/survoltage/id6443993237)

**In-app purchases:** none


## Frequently asked questions

### Is Heatzy FLAT free?

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

### Is Survoltage free?

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

### Do Heatzy FLAT or Survoltage have ads?

Neither Heatzy FLAT nor Survoltage shows ads.

### Which is updated more often, Heatzy FLAT or Survoltage?

Heatzy FLAT ships an update every 8 months, and Survoltage monthly. Most recently, Heatzy FLAT was updated on October 9, 2026 and Survoltage on October 4, 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.*