# Douber: Duals & Parallel Apps — Do Multiple Private Space App

> Run multiple apps side-by-side with an incognito browser and integrated tools. (iPhone/iPad app by Ha Dinh Duc.)

- Source: https://appshunter.io/ios/app/douber-duals-and-parallel-apps/id1629804902 (this page in markdown: same URL + `.md`)
- Developer: [Ha Dinh Duc](https://appshunter.io/developer/1629804904)
- Category: Utilities
- Price: Free with in-app purchases
- Rating: 4.63/5 from 19 App Store ratings · 3 written reviews indexed
- Age rating: 17+
- Requires: iOS 12.0 · 19 MB
- Languages: English
- Released: 2022-08-07
- Data updated: 2026-07-07
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/douber-duals-and-parallel-apps/id1629804902/reviews.md

## What is Douber?

Douber is an application for busy people, stock players, accountants who have to simultaneously use a Web browser and other tasks like quick notes, calculator, calendar, documents.
With a simple and intuitive interface, Douber is easy for everyone to use right from the start. The top half of the application is an incognito browser, the bottom is Flash note, Calendar, Calculator, PDF Viewer.

Premium subscription information:

- Plus features: Unlimited Flash Notes, Unlock Light Calendar, Unlock Quick Calculator, Unlock PDF Viewer, Dual Web Browser View, Security Password Generator Feature, Tini Maps View
- Price: $19.99/year.

Privacy Policy: https://douber-smartview.web.app/policy.html
Terms of Use: https://douber-smartview.web.app/terms.html

## Key features

- Incognito browser
- Flash notes
- Calculator
- Calendar
- PDF viewer
- Dual web browser view
- Security password generator

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Premium | $19.99 | per year |


## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/douber-duals-and-parallel-apps/id1629804902/reviews.md

### 1/5 — Don’t hijack me out the app for a review

*2024-10-02*

zero stars

### 1/5 — Don’t high jack me out the app for a review

*2024-09-18*

Was high jacked out the app before I could even use it.. zero stars

### 4/5 — Almost prefect

*2023-10-04*

I downloaded this to try the free trial, thinking I might actually want to commit to it after, as it has a lot of the figures I’m after. 

Except, after having used it for a little bit, I’ve discovered that not all of my PDFs show up, and I can’t really zoom in much on my documents. 

I also find it more than a little frustrating that I can’t move the dual screens, up or down, or switch them about like you can in other apps.

## Frequently asked questions about Douber

### What is Douber?

Douber is a utility app that allows you to run two applications simultaneously, such as an incognito browser alongside tools like notes, a calculator, or a calendar. It's designed to enhance multitasking for busy users.

### What features are included in the Premium subscription for Douber?

The Premium subscription for Douber offers unlimited Flash Notes, access to the Light Calendar and Quick Calculator, PDF Viewer, Dual Web Browser View, a Security Password Generator, and Tini Maps View. This subscription costs $19.99 per year.

### Does Douber have ads?

Yes, Douber contains advertisements. As a free app with in-app purchases, advertisements are part of the user experience.

### What devices does Douber support?

Douber is supported on iPhone and iPod devices. It was last updated on May 11, 2023, with version 1.2.1.

### What is the age rating for Douber?

Douber has an age rating of 17+, indicating it may contain content suitable for mature audiences. This is based on its release date of August 7, 2022.

### How often is Douber updated?

Douber was last updated on May 11, 2023, with version 1.2.1. This suggests regular updates to improve functionality and address issues.

### What is the user sentiment for Douber?

Douber has a high rating of 4.6 stars from 19 ratings, indicating generally positive user sentiment. Users appreciate its multitasking capabilities.

### Is there a free trial for Douber Premium?

Yes, the Premium subscription for Douber includes a 3-day free trial. This allows users to test the premium features before committing to the $19.99/year subscription.

## Version history (last 4 releases)

### 1.2.1 — 2023-05-11

- Completely remove ads even for the free version
- Add feature to quickly share website by QR
- Bug fixes and performance improvements

For paid vesion Douber Plus:
- Add Security Password Generator Feature
- Add Dual Web Browser View
- Add Tini Maps View

### 1.1.2 — 2022-11-29

- Add yahoo search engine
- Optimize webview load

### 1.1.0 — 2022-10-26

Fixed a bug where some flash notes didn't autosave

### 1.0.0 — 2022-08-07

No release notes.

## Apps similar to Douber

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Split Screen Dual Window View](https://appshunter.io/ios/app/split-screen-dual-window-view/id1573526409) | 4.4 (126) | Free | Utilities |
| [Dual Space - Parallel Space](https://appshunter.io/ios/app/dual-space-parallel-space/id6450270672) | 4.7 (38) | Free | Utilities |
| [Split Web Browser](https://appshunter.io/ios/app/split-web-browser/id940094154) | 4.4 (731) | Free | Utilities |
| [Halfsurf:Horizontal Split View](https://appshunter.io/ios/app/halfsurfhorizontal-split-view/id1645250788) | 4.6 (11) | Free | Utilities |
| [Dual Accounts - Parallel Apps](https://appshunter.io/ios/app/dual-accounts-parallel-apps/id6670338973) | 5.0 (1) | Free | Utilities |
| [Dual Browser - Screen Split](https://appshunter.io/ios/app/dual-browser-screen-split/id6444697717) | 1.5 (4) | Free | Utilities |

## More apps by Ha Dinh Duc

- [Lizo: Quản lý xăng phương tiện](https://appshunter.io/ios/app/lizo-quan-ly-xang-phuong-tien/id6444329833)
- [mPan: WiFi & Network Toolkit](https://appshunter.io/ios/app/mpan-wifi-and-network-toolkit/id6444547143)

All apps by Ha Dinh Duc: https://appshunter.io/developer/1629804904

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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 2026-07-07.*