# O-pens

> Nail gel color mixing guide for custom shade creation. (iPhone/iPad app by Guangzhou Taiji Electronic Co., Ltd..)

- Source: https://appshunter.io/ios/app/o-pens/id1147451245 (this page in markdown: same URL + `.md`)
- Developer: [Guangzhou Taiji Electronic Co., Ltd.](https://appshunter.io/developer/1097020532)
- Category: Business, Lifestyle
- Price: Free
- Rating: 3.00/5 from 2 App Store ratings · 2 written reviews indexed
- Age rating: 12+
- Requires: iOS 9.1 · 13 MB
- Languages: American English, French (France), Chinese (Simplified, China), European Spanish
- Released: 2017-03-30
- Data updated: 2026-06-11
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/o-pens/id1147451245/reviews.md

## What is O?

A nail color guide program for nail art, specially designed for color gel mixing pens in red, yellow, blue, black, white base colors and specific color gel polish, by indicating the rotating scale on the color gel mixing pen , controlling the extrusion volume of gel polish so that the base colors or specific colors can be mixed in different proportion to produce a variety of nail colors.

Features:
1. Support two or more base colors gel polish or specific colors mixing guidance.
2. Support the display of the color effect of physical photos, one-click selection of color mixing guidance.
3. Support code identification of different base colors combination and independent color mixing interface guidance.
4. Support the choice of the number of nails that can be applied with the color gel.
5. Support multi-language selection and online tutorial.

## Key features

- Guides mixing of base and specific gel polish colors
- Displays physical color effect previews
- Supports code identification for color combinations
- Calculates gel volume for desired number of nails
- Offers multi-language support and online tutorials

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/o-pens/id1147451245/reviews.md

### 5/5 — Hi

*2019-08-27*

It interesting

**Developer response:** Hey, Thank you! :D We're glad to hear you're enjoying the product!

### 4/5 — Un petit manque!

*2018-11-03*

Il n’y a pas d’aide dans l’app mais tout le reste est parfait! Merci pour la gratuité!

## Frequently asked questions about O

### What is O-pens used for?

O-pens is a nail color guide program designed for mixing color gel polish. It helps users determine the correct proportions of base colors and specific gel polishes to create a wide variety of custom nail colors for nail art.

### How does O-pens help with color mixing?

O-pens uses a rotating scale to indicate the extrusion volume of gel polish. This allows users to mix base colors and specific colors in precise proportions to achieve desired nail shades.

### Can O-pens show me what the mixed color will look like?

Yes, O-pens supports the display of color effects using physical photos. This feature allows for one-click selection of color mixing guidance, giving you a visual preview of the resulting shade.

### Does O-pens support mixing multiple colors?

Yes, O-pens supports the guidance for mixing two or more base colors or specific colors of gel polish. It also supports code identification for different base color combinations.

### Can O-pens tell me how much polish I'll need?

O-pens supports the choice of the number of nails that can be applied with the mixed color gel. This helps in estimating the required volume of mixed polish.

### Is O-pens available in other languages?

Yes, O-pens supports multi-language selection, making it accessible to a wider range of users. It also provides online tutorials to assist users.

### What devices does O-pens support?

O-pens is supported on iPhone and iPod devices. It is rated for users aged 12 and above.

### How often is O-pens updated?

The latest version of O-pens is 5.0.7, last updated on February 28, 2026. This indicates a relatively recent update, suggesting ongoing development and support.

## Version history (last 5 releases)

### 5.0.7 — 2026-02-28

Update SDK version.

### 5.0.6 — 2025-01-16

Update SDK to add French translation

### 5.0.4 — 2024-05-24

Fixed some bugs.

### 5.0.3 — 2021-09-17

Fixed some bugs.

### 5.0.2 — 2021-09-06

Fixed some bugs.

## Apps similar to O

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [微粉大师——微商客源助手名片获客加粉帮手](https://appshunter.io/ios/app/id1658213454) | — | Free | Business |
| [Kapci Smart Mix](https://appshunter.io/ios/app/kapci-smart-mix/id597368551) | 4.0 (3) | Free | Business |

## More apps by Guangzhou Taiji Electronic Co., Ltd.

- [O2Nails](https://appshunter.io/ios/app/o2nails/id1097020533)

All apps by Guangzhou Taiji Electronic Co., Ltd.: https://appshunter.io/developer/1097020532

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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 2026-06-11.*