How can we help?
One inbox for all Demir Studio apps. Pick an app below for quick answers, or email support@demir.pro. We usually reply within two business days.
Clash
Clash: The Numbers
Number duels, solo runs, and friend challenges. Start here if a round, purchase, or account is not behaving.
Questions
How do I play a round?
Tap numbers so their sum matches the target, then confirm. Clear as many targets as you can before the 60-second timer ends.
How do I delete my Clash account?
Open the account deletion page for the step-by-step instructions and the in-app path. You can also email support if you cannot sign in.
How do I cancel Clash Pro?
Subscriptions are managed by Apple or Google, not inside Clash. Open your App Store or Google Play account settings, find Clash Pro, and cancel there.
How do refunds work?
Refunds are handled by the store. Apple: reportaproblem.apple.com. Google Play: order history in the Play Store. We cannot issue store refunds directly.
Why can’t I join a live duel?
Live duels need a stable connection. Check your network, make sure the app is up to date, and try again. If it keeps happening, email us with your device model and the approximate time.
My progress disappeared. What now?
Sign in with the same Apple or Google account you used before. If you played as a guest, progress may be tied to that device. Email support with your username tag if you need help.
SHIFT
SHIFT: Makam & Transpose
Makam scales, transposition, and practice tools. Find answers about the library, purchases, and offline use.
Questions
How do I transpose a makam?
Open a makam, choose the target pitch, and SHIFT recalculates the notes and accidentals while keeping the makam’s interval structure.
How do I restore a purchase?
Open the purchase screen and tap “Restore purchases”. Make sure you are signed in to the same store account you used for the original purchase.
Does SHIFT work offline?
The makam library and transposition tools work offline. Store purchases, restores, and updates need an internet connection.
How do refunds work?
Refunds are handled by Apple or Google. Apple: reportaproblem.apple.com. Google Play: order history in the Play Store.
A scale image is missing or blank.
Update SHIFT to the latest version and reopen the makam. If the image is still missing, email us with the makam name and your device model.
Where can I browse all makams?
The SHIFT web catalog lists every makam with its scale and notes. Open it from the link above the FAQ.
Faturalar
Faturalar — e-Invoice Reader
Open UBL-TR e-Fatura and e-Arşiv XML on your Mac. Faturalar is local-only; your invoices never leave your device.
Privacy first: Faturalar has no account, no upload, and no analytics. If you email us, we only see what you choose to send.
Questions
Which file formats does Faturalar open?
UBL-TR e-Fatura and e-Arşiv XML files, plus ZIP archives that contain them.
Are my invoices uploaded anywhere?
No. Faturalar processes files on your Mac. There is no server upload, no account, and no analytics in the app.
How do I save a PDF?
Use the macOS print dialog (File → Print) and choose “Save as PDF”. The resulting PDF is created on your Mac.
How do I restore or refund a purchase?
Purchases are handled by the Mac App Store. If you reinstalled the app, the purchase is tied to your Apple ID. For refunds, visit reportaproblem.apple.com.
What are the system requirements?
macOS 14 or later. Faturalar is designed for Apple silicon and Intel Macs.
An invoice looks wrong. Can you check it?
First check the original XML and the issuer’s copy. If you contact support, send the app version, macOS version, and a screenshot of the issue. Please do not send invoice files unless you are comfortable sharing them.
Is Faturalar a subscription?
No. It is a one-time purchase on the Mac App Store.
Does Faturalar create invoices?
No. It is a viewer for invoices you already received. It does not issue e-Fatura or e-Arşiv documents.
Still need a hand?
Email support@demir.pro and include the app name in the subject. If your request is about a purchase, add the store order ID if you have it.
Before you write
- Tell us which app you are using.
- Include your app version, macOS/iOS version, and device model.
- Describe what you expected and what happened.
- A screenshot helps. Please do not send invoice files or other sensitive data unless you are comfortable sharing them.