# 완충e vs 덤즈

The clearest difference is iOS requirement: 완충e at 13.0 against 덤즈's 18.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

완충e ships an update weekly, 덤즈 every 2 weeks. The most recent releases landed on November 3, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | 완충e | 덤즈 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (2 ratings)](https://appshunter.io/ios/app/e/id1531816431/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 12.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 weeks |
| Monetization | Free | — |
| Size | 63 MB | 35 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [에브리포터블(주)](https://appshunter.io/developer/1515091508) | [DUMBS](https://appshunter.io/developer/1760905477) |

## What reviewers say

### 완충e

[App page](https://appshunter.io/ios/app/e/id1531816431)

This service allows users to easily rent and return portable chargers via QR code. Simply rent when needed, and return the charger after use without needing the app for the return process.

**Highlights:** QR code rental, Easy return, On-demand battery charging, Convenient service

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Convenient for emergencies
- 👍 Fast charging speed (mentioned by a few)
- 👍 Multiple charging ports
- 👍 Quick customer service feedback (rare but mentioned)

**What reviewers complain about**

- 🐛 Login issues (frequent)
- 🐛 Payment/card registration failures
- 🐛 Battery not charging/malfunctioning
- 🐛 Return/refund issues
- 🐛 Inconsistent charging speed

**Reported bugs**

- Login authentication failures (Kakao, Naver)
- Payment gateway errors (card registration, payment failure)
- Batteries not charging or showing as charging when they are not
- Return process not registering, leading to extra charges
- App crashes or errors preventing usage

**Requested features**

- Improve login system stability
- Fix payment processing errors
- Ensure battery quality before rental
- Provide clearer return instructions/confirmation
- Improve customer service availability and responsiveness


### 덤즈

[App page](https://appshunter.io/ios/app/id6602890489)

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

**In-app purchases:** none


## Frequently asked questions

### Is 완충e free?

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

### Is 덤즈 free?

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

### Do 완충e or 덤즈 have ads?

Neither 완충e nor 덤즈 shows ads.

### Which is updated more often, 완충e or 덤즈?

완충e ships an update weekly, and 덤즈 every 2 weeks. Most recently, 완충e was updated on November 3, 2026 and 덤즈 on October 24, 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.*