# ISign+ OTP

> Generates one-time passwords for secure multi-factor authentication. (iPhone/iPad app by Penta Security Inc..)

- Source: https://appshunter.io/ios/app/isign-plus-otp/id919437581 (this page in markdown: same URL + `.md`)
- Developer: [Penta Security Inc.](https://appshunter.io/developer/919437580)
- Category: Utilities, Business
- Price: Free
- Age rating: 4+
- Requires: iOS 8.0 · 2 MB
- Languages: American English, Korean
- Released: 2014-10-12
- Data updated: 2026-08-24
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/isign-plus-otp/id919437581/reviews.md

## What is ISign+ OTP?

1. What is ISign+ OTP?
ISign+ OTP (One Time Password) is a security application that generates a one-time password to provide additional user authentication at login. ISign+ OTP service generates unique passwords for each login so users can enjoy secure login anytime, anywhere.
  * Features
    - Generate OTP without requiring data connection
    - Multiple OTP registration supported
    - Application lock function

2. User Guide
  * Initial Registration of OTP
    1. After installing ISign+ OTP, enter the OTP name and the serial number from the PC into the field displayed on the mobile phone.
    2. Enter the mobile verification code generated by the ISign+ OTP application into the Mobile Registration field displayed on the PC.
    3. Enter Test OTP from the ISign+ OTP application into the Test OTP field on the PC screen.
    4. If Test OTP is successful, select the Register OTP button on the ISign+ application and the PC screen.
  * OTP authentication
    1. If the initial login to the service is successful, an OTP number input window will be displayed.
    2. Enter the OTP number from the ISign+ application into the OTP input window.

3. Notes on Use
ISign+ OTP is provided to enterprise customers using ISign+.
If an OTP reset message is displayed, please contact the administrator for assistance.

## Key features

- Generates OTP without data connection
- Supports multiple OTP registrations
- Includes application lock function
- Secure login authentication
- Offline password generation

## Recent user reviews (10 of 16)

All indexed reviews: https://appshunter.io/ios/app/isign-plus-otp/id919437581/reviews.md

### 1/5 — ㅅ

*2026-02-19*

이딴거 만들지좀마라 대학 ㅅ 귀찮게 ㅂ

### 3/5 — 휴대폰을 바꾸면서 otp번호가 안뜨네요

*2025-09-22*

otp번호도 안뜨고 원래 있던 60초 타이머칸에 -1만 뜨고있어요

### 2/5 — 유료 인가요? 왜 결제가 되죠??

*2025-08-14*

왜 결제가 되죠 15,900원이?

### 3/5 — 애플워치용좀 내주세요

*2024-10-05*

휴대폰켜서 보는거보다 워치로 볼수있으면 더편할거같네요 출시좀 해주세요

### 5/5 — 오티피 번호가 안뜨는데 어떻게 뜨게하는지 알려주세요 ㅠㅠ

*2022-07-09*

ㅠㅠ 안뜨네요..

### 1/5 — 아이디 비번

*2022-06-09*

아이디 비번 찾는법 이니면 초기화 하는법

### 3/5 — 매우 불편 개선 긴급요청

*2022-03-01*

모바일 등록번호를 몰라 재설치를 해도 모바일 등록번호 생성이 안됨

학교 등록을 못하여 퇴학 직전임

### 1/5 — 삭제안됨

*2021-10-21*

곤란해졌어요 삭제가 안되네요

### 4/5 — 오류에 관하여 궁금합니다.

*2021-08-26*

저는 본 앱을 삭재하고 다시 설치하였으나 초기화가 안되고있습니다. 이런경우 프로그램이 엉킨 것 같은데 알아볼 길이 없네요.  본 앱을 사용하여 강의 사이트에 접속을 하여야하는데 큰 일 입니다.

### 3/5 — Otp번호를 한 싸이트에서 두개를 생성해버렸는데

*2020-08-29*

하나 삭제하는 방법이 없나요...? 아니면 두개여도 가능한건가요...? 제발 빨리 답변 부탁드립니다  ㅠㅠㅠ

## Frequently asked questions about ISign+ OTP

### What is ISign+ OTP used for?

ISign+ OTP is a security application designed to generate one-time passwords (OTPs). These OTPs provide an additional layer of user authentication, enhancing the security of your login process.

### Can ISign+ OTP generate passwords offline?

Yes, ISign+ OTP can generate one-time passwords even without an active data connection. This feature ensures you can always authenticate securely, regardless of your network availability.

### How do I register an OTP with ISign+ OTP?

To register, you'll enter an OTP name and serial number from your PC into the app. Then, you'll input a verification code from the app into your PC, followed by a test OTP. Successful testing allows you to register the OTP on both devices.

### What happens if I need to reset my OTP with ISign+ OTP?

If you see an OTP reset message, you should contact your system administrator for assistance. They will be able to guide you through the necessary steps to reset your OTP.

### Is ISign+ OTP available on Android devices?

Based on the provided data, ISign+ OTP is supported on iPhone and iPod devices. Information regarding Android compatibility is not available in this description.

### How often is ISign+ OTP updated?

The latest version of ISign+ OTP is 3.3.3, which was last updated on December 10, 2020. Further details on update frequency are not provided.

### Does ISign+ OTP have ads?

No, ISign+ OTP does not contain advertisements. The application is free to use and does not display any ads to users.

### What is the age rating for ISign+ OTP?

ISign+ OTP has an age rating of 4+. This indicates it is suitable for users aged four and above.

## Version history (last 5 releases)

### 3.3.3 — 2020-12-10

Press and hold OTP to copy it to the clipboard.
iOS 13 support.

### 3.3.2 — 2019-10-22

support Face ID

### 3.3.1 — 2019-06-10

language support (english)

### 3.2.1 — 2019-05-11

url scheme 오류 수정

### 3.2.0 — 2019-04-25

Face ID 사용기기에서의 비정상 종료 수정 - Face ID 허용 메시지 추가
iPhone XR, XS Max 의 비밀번호 입력 화면에서 타이틀이 노치에 가려지는 현상 수정
Guideline 2.5.1 지적사항 수정 - prefs:root 삭제

## Apps similar to ISign+ OTP

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [ANY OTP](https://appshunter.io/ios/app/any-otp/id833250884) | 1.0 (2) | Free | Utilities |
| [weerket](https://appshunter.io/ios/app/weerket/id6447608511) | — | Free | Utilities |
| [KollusPlayer](https://appshunter.io/ios/app/kollusplayer/id760006888) | 1.4 (82) | Free | Utilities |
| [MyOTP](https://appshunter.io/ios/app/myotp/id922854178) | 1.0 (1) | Free | Utilities |
| [행정반 - 전역일계산기, 커뮤니티, 식단](https://appshunter.io/ios/app/id1499123725) | 4.8 (46) | Free | Utilities |
| [AnyAUTH](https://appshunter.io/ios/app/anyauth/id1487058080) | 5.0 (1) | Free | Utilities |

## More apps by Penta Security Inc.

- [iSIGN+ PASS](https://appshunter.io/ios/app/isign-plus-pass/id1573918374)
- [iSIGN+ PASS v2](https://appshunter.io/ios/app/isign-plus-pass-v2/id6444204442)
- [디아모에러코드](https://appshunter.io/ios/app/id6446819513)
- [Cloudbric VPN](https://appshunter.io/ios/app/cloudbric-vpn/id6480168061)

All apps by Penta Security Inc.: https://appshunter.io/developer/919437580

## Related topics

[isign](https://appshunter.io/ios/topics/isign) · [isigner](https://appshunter.io/ios/topics/isigner) · [oath otp client](https://appshunter.io/ios/topics/oath-otp-client) · [dainese](https://appshunter.io/ios/topics/dainese)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-24.*