완충e vs flip_day
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
완충e
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.
- QR code rental
- Easy return
- On-demand battery charging
- Convenient service
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QR코드로 쉽게 대여하고 간편하게 반납하는 보조배터리 대여 서비스. '완충이'는 여러분이 원할때 언제 어디서든 빠르게 배터리를 대여 할 수 있고 충전 후 APP을 사용하지 않고 그냥 반납만 해주시면 됩니다.
flip_day
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자신감을 얻으면서 하나씩 목표를 이루어가며, 도감도 채우는 재미를 느껴보세요.
Screenshots
Verdict
The clearest difference is update cadence: 완충e at weekly against flip_day's fortnightly. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
완충e ships an update weekly, flip_day fortnightly. The most recent releases landed on November 3, 2026 and October 7, 2026 respectively.
| Parameter | 완충e | flip_day |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (2 ratings) — better | — |
| Positive reviews | 12.5% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Weekly — better | Fortnightly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 13.0 | 13.0 |
| Further details — not scored | ||
| Size | 63 MB | 38 MB |
| Age rating | 4+ | 4+ |
| Developer | 에브리포터블(주) | taewoo kim |
Bugs and requests
완충e
Reported bugs
8 issues- 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
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- Authentication code timeout issues
- Inaccurate billing or unexpected charges
- Spam calls originating from app usage
Requested features
10 requests- Improve login system stability
- Fix payment processing errors
- Ensure battery quality before rental
- Provide clearer return instructions/confirmation
- Improve customer service availability and responsiveness
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- Offer better pricing or clearer fee structures
- Allow registration of check cards
- Display battery charge level before rental
- Allow in-app reporting of faulty batteries
- Simplify the app onboarding process
flip_day
Not enough reviews yet to summarise bugs or requests.
In-app purchases
완충e
No in-app purchases
flip_day
No in-app purchases
