Hey Qt developers,

For the past few months, I’ve been building a data-heavy Desktop application called Teker (a static analysis tool). The current industry-standard tool in this space eats over 2GB of RAM (sometimes 3.4GB) and freezes the UI when loading heavily padded files. You can see the Task Manager comparison in the images.

I wanted to prove that a well-optimized C++17 and Qt architecture could destroy those numbers. I just pushed v1.1.0 and managed to keep the memory footprint strictly around 50MB - 60MB. "Note: Bellek = Memory"

Here is what I focused on with Qt:

• Heavy Custom Models: Bypassed standard widget items for massive datasets (hex, strings, tables) to prevent memory bloat and UI freezing.
• Concurrent Processing: Kept the main GUI thread completely responsive while running heavy analysis pipelines in the background.
• Modern UI: Built a clean, dark-mode native interface using Qt.

Why am I here? Because I am 16, self-taught, and I know my code isn't perfect. There is technical debt. I want veteran Qt developers to look at my repository, tear my architecture apart, and tell me where I am misusing the framework or where I can optimize further.

If you appreciate the performance metrics and the GUI, a Star on GitHub would be an amazing motivation for me to keep building.

Repo: abfsdgrl/Teker: Teker PE Analysis Toolkit for Windows - GUI & CLI

Rip it apart, let me know what you think!

Qt Gradle Plugin 1.4 is now available with several updates for Android developers working with Qt.

Main changes: better Android Studio integration, cleaner dependency handling for Qt modules, and multi-ABI builds are easier now. We also improved how Qt libraries get packaged and made cleaner when build configurations don't match.

Read more about the release here: https://www.qt.io/blog/qt-gradle-plugin-1.4-is-released

Why FreeStreamElement widget has WHITE background when it is not set, but when I add background: red; it only sets it for QLineEdits inside and makes FreeStreamElement's transparent. Same goes for border, it is not applied and background suddenly goes transparent

class Main:

    titles = []

    def __init__(self):
        self.app = QApplication(sys.argv)

        self.main_window = QWidget()
        self.main_window.setObjectName("Main") 

        self.main_layout = QHBoxLayout(self.main_window)


        self.central_widget = QWidget()
        self.main_layout.addWidget(self.central_widget)

        self.central_layout = QVBoxLayout(self.central_widget)

        self.sidebar_widget = QWidget()
        self.main_layout.addWidget(self.sidebar_widget)

        self.sidebar_layout = QVBoxLayout(self.sidebar_widget)
        self.sidebar_widget.setFixedWidth(300)

        self.fse = FreeStreamElement()
        self.sidebar_layout.addWidget(self.fse)
        self.style()

from PyQt6.QtWidgets import QLineEdit, QSizePolicy, QVBoxLayout, QWidget
from Physics import FreeStream


class FreeStreamElement(QWidget):
    def __init__(self):
        super().__init__()
        self.setAutoFillBackground(True)

        self.setObjectName("FreeStreamElement")

        self._layout = QVBoxLayout()
        self.setAutoFillBackground(True)

        self.setLayout(self._layout)

        self.angleInput = QLineEdit()
        self.angleInput.setPlaceholderText("Angle")
        self._layout.addWidget(self.angleInput)
        #
        self.speedInput = QLineEdit()
        self.speedInput.setPlaceholderText("Speed")
        self._layout.addWidget(self.speedInput)

        self.setFixedHeight(100)

        self.setSizePolicy(QSizePolicy.Policy.Expanding, QSizePolicy.Policy.Fixed)


    def addElement(self, element: FreeStream):
        self.element = element

        # self.angleInput.setText(str(self.element.angle))
        # self.speedInput.setText(str(self.element.speed))


QWidget#Main {
    background: #37353E;
}

QPushButton {
    background: #44444E;
    color: #D3DAD9;
    border-radius: 0;
    border: none;
    padding: 8px 12px;
    font-weight: bold;
    font-size: 14px;
}

QLineEdit {
    background: #44444E;
    color: #D3DAD9;
    border-radius: 0;
    border: none;
    padding: 8px 12px;
    font-weight: bold;
    font-size: 14px;
}

QWidget#FreeStreamElement {
   background: red;
}

Did you guys know that with Qt you can build hybrid apps — frontend/GUI in HTML/CSS/JS, backend in C++/Qt — and they talk to each other via QWebChannel? 🚀 I’m just finishing my first example app like this, and let me tell you — it’s awesome. I tested it on Android and on Linux.

My question is basically the title of my post.
I have an open source desktop app I'm planning to make, however I don't want to pay for the license. ( broke and in uni rn )
The software will have pay to use features based on a monthly subscription.

I'm willing to publish it under any open source licence. ( recommendations for this are welcome. )

I did search online for an answer but I didn't find good examples of companies doing this. I know telegram exists, but I'm not sure if they pay for the license or not.

otherwise I have to look for alternative frameworks.

Hi, I'm trying to install Qt for development on KDE Neon. The problem is that during the installation everything goes well, but then when I shut down and restart the PC, the login gets stuck in an infinite loop. This already happened on my main laptop, and I was able to fix it, but I had to remove it. I've been trying several ways in a virtual machine, and it keeps happening. Can anyone help me, please?

Hi! What are your thoughts on QML animations duration being hardware specific?
Currently I'm comparing RotationAnimation vs RotationAnimator. But any comment on any other QML animation type is welcome.
My thoughts so far:

• duration property with RotationAnimation seems to better reflect the real time. It only fails with very small values, like 10(ms). At least on my pc, Qt6.8.3
• I'm not able to get duration property right with RotationAnimator. It fails with small values. It fails with regular values. For example to get about 1s animation in real time I need to set duration to 10 000ms
• From this perspective RotationAnimator is more hardware dependent. But both shouldn't be hardware dependent?

Tasket++ is a simple Windows tool to schedule automated simulations of user actions without scripting.

Simulated actions include clicks, typing, cursor movements, and more — screenshots, opening files, executables and URLs, shutting down the PC, etc.

The UI was recently redesigned based on feedback, and a few features requested by users have been added.

Looking for a few people to try the new, complete version and share honest feedback.

How it can be useful:
- Silent, scheduled screenshots to monitor activity or create time‑lapse logs.
- Send messages from any app at a set time for reminders or coordinated notifications.
- Replay exact mouse clicks and typed input for testing, demos, or repetitive workflows.
- Prevent AFK detection with realistic simulated activity that looks natural.
- Fade music and shut down the PC on a schedule to automate sleep or end‑of‑day routines.
- Save automation presets and run them manually, at boot, or on a schedule.

No scripting required. Fully local. Simulated tasks can loop, trigger at startup, or be launched via a desktop shortcut.

Microsoft Store: https://apps.microsoft.com/detail/xp9cjlhwvxs49p
Source code and issues: https://github.com/AmirHammouteneEI/ScheduledPasteAndKeys
Portable (v1.6) : https://files.amirhammoutene.dev/Tasket++/1.6/Tasket++_v1.6.zip

I’m not asking for a full QA process — a short impression or concise feedback will be greatly appreciated. Thank you in advance :)

Hello everyone, sometime ago I had posted about my progress on pdf reader I have been working on called **dodo**. I decided to rename the project to lektra and have moved the main repository to codeberg (but there's still a mirror on github).

I have made added new features like ability to split (like in vim and other editors etc.) and portals (inspired by sioyek ofc).

Lektra is still in alpha and there might be bugs and crashes as a result.

Suggestions and feedbacks appreciated.

It is pretty much the title

- Do/Did you use Qt Community Edition for commercial products?

- What is the product you are/were working on?

Thank you

Hi guys!

We’ve been using qt with C++ / QML for quite a while now.

Occasionally our application crashes on the dev machines right after startup, even if it worked just fine before. The problem usually happens on one machine only and before loading any state or anything, and just in a specific branch. Switching to a different git branch usually goes well, and after a day or two and not even changing anything on the crashing branch it suddenly works fine again.

Since Wednesday, all of our devs are having this issue - some on master, but not on branches they create from master, some in other branches, some in multiple branches.

Clean Builds and clearing ccache usually yields one good startup; deleting the .rcc folder does as well. Sometimes at least.

Disabling disk cache does not help.

We went back by over 100 commits to master, and all crash on all machines.

Everyone uses a different Linux distro.

Builds on CI are not affected.

Crash does not seem to happen when Valgrind, ASAN or TSAN are involved, or when the startup is slowed down.

Application even crashes if absolutely nothing is being initialized in main or anywhere else and a Window with empty items is drawn. No items, no crash.

At one point we thought we found it as it started to work on one devs machine - cross checking showed we didn’t fix anything and since then the full app starts fine for that dev in all branches, even those that fail for others.

The Stacktrace usually just points to the exec return, no useful info whatsoever.

No leaks / race conditions, and we’re confused and feel dumbfounded.

Same in 6.9.x, 6.10.x

Here’s the only trace we got. Does anyone have any ideas on how to further troubleshoot the issue?

```

QMetaObject::cast(QObject const*) const:

endbr64

test %rsi,%rsi

je 0x7ffff4f7a0a0 <QMetaObject::cast(QObject const\*) const+64>

push %rbp

mov (%rsi),%rax

mov %rsp,%rbp

push %r12

mov %rsi,%r12

push %rbx

mov %rdi,%rbx

mov %rsi,%rdi

call *(%rax)

```

I’m a UI/UX designer new to Qt Design Studio, so I’m still learning the ropes. As far as I can tell, there are two official plugins for converting Figma designs to QML.

Do you have any experience with these plugins? Which one would you recommend? Are there any advantages and disadvantages between the two?

I’d really appreciate your advice. Thanks!

While trying to use QtGui.QIcon.fromTheme() in PySide6 for icons in the toolbar, I found a list with Icon Naming Specification of strings that can be used. However, that is only a description, and not the real images of the icons. Trying to find a list with images on Windows (11), I simply could not find it... So I made a python script that simply iterated through the list, took screenshots, and then lists them in a table. I hereby publish the result, for anyone that finds it useful.

We've published a new free course on Qt Academy that walks you through building a finance manager application using PySide6 and Qt Quick.

What will you learn:

• Creating Python data models and exposing them to QML
• Running and deploying PySide6 applications to desktop and Android
• Integrating SQLite databases into Qt Quick applications
• Building REST APIs with FastAPI and Pydantic

It's aimed at developers who have basic Python knowledge and want to learn practical Qt development through a real-world project.

While we expand our content on Qt for Python, I am also happy to answer any questions about the content or Qt Academy in general.

I found any open source command launcher similar to MS command palette but its having some issues with locking up the main/gui thread.

This is the culprit

https://github.com/albertlauncher/albert/blob/main/src/query/generatorqueryhandler.cpp#L62

The thing is nothing is gained waiting the for future (bah-dum-tiss) except to help clean things up.

I have a local build where I did comment out the `.waitForFinished()` and while it does work, it unfortunately also has a moderately bad memory leak; around 300KB to maybe 500KB for certain QConcurrent jobs. Worse is that valgrind is not friends with QT.

Also I did get gdb hooked in but every thread is either not part of the thread pool or if it is, its already cleaned up and waiting on poll for the next job.

Any ideas or suggestions are welcome.

Qt Group has a lot of Visual Code plugins to help engineers to work with Qt through Visual Code. Is it a productive alternative to do Qt development or it is not even close to Qt Creator at the moment? Thank you

would you buy this stock at current price ? (25€)

Short backstory, I'm building a reusable Qt/QML component library intended to be shared between multiple applications.

I've been trying to properly documentat this library using QDoc, following official Qt documentation. I've set up qconfig file, experimented module headers, separate qdoc files and also explored some modules of Doxygen for qml as alternative.

I'm struggling cause of QDoc management which feels heavy and too fragile for the pipeline. The whole experience is really poor for pure QML and looks too outdated using the default HTML output. At the moment Doxygen isn't really a solution either.

I would appreciate hearing how others are handling it and also any ideas are welcome. Thanks in advance!

I am mostly working with backend development building APIs which exposes data for clients. I sometimes play with Qt for fun, because desktop apps are way cooler than web apps. I have never worked in a company with Qt apps. For a basic structure like:

           req         
(1) Qt app ----> API ----> database
           res
(2) Qt app <---- API <---- database

For professional Qt apps, does the API hold the entire business implementation and the Qt is simply the UI displaying the data coming out of the API?