BlueGraysArduino · ESP32 · Pico

Subscription and In-App Purchase Terms

This is an English translation. In case of any conflict, the Turkish version prevails.

Last updated: October 31, 2026

Version: 2.0

In short

  • Premium is a monthly or yearly subscription. It renews automatically at the end of each period until you cancel, and the fee is charged to your store account.
  • You cancel in the subscription settings of the App Store or Google Play. Premium continues until the end of the period you paid for. Deleting the app or your account doesn't cancel the subscription.
  • Because Premium and Educator Pack codes become available the moment you buy them, you have no right of withdrawal. Refund requests follow the store's rules. Your statutory rights are reserved.
  • A subscription you start at a "Just for you" price renews at the same price as long as it continues without a break.
  • An educator code's period starts on the day the code is redeemed.

Provisions in bold may have consequences that work against you, so please read them with extra care.

1. Parties and scope

These terms govern the Premium subscription, personal offers and Educator Packs sold in the BlueGrays apps through the App Store and Google Play. They also apply to people who redeem an educator code and to people who receive gift Premium. They form an integral part of the Terms of Use.

  • Service provider: Yunus Emre EKE (BlueGrays)
  • Address: Beylikdüzü, Istanbul *****
  • Tax ID number: *****
  • Email: [email protected]
  • Phone: *****

Before you buy, the app shows you the Pre-Information Form. When you buy, the Distance Sales Agreement is concluded.

2. Purchase and payment

  • Purchases are made only within the app, through the Apple App Store or Google Play. No payments are taken on the website.
  • The store charges the payment method registered in your store account. Your card details never reach us. On the App Store, the sale is made through Apple as an intermediary (Apple Distribution International Ltd.). On Google Play, Google provides the payment service.
  • The relevant store's terms of use also apply to the purchase. The store sends the invoice or receipt.
  • Prices include taxes and vary by country and currency. The amount and the period you'll pay for are shown in the app and on the store's confirmation screen right before you buy.

3. Premium

3.1 What does it include?

Premium unlocks:

  • Circuit diagrams, code, videos and step-by-step guides for all projects,
  • The full component guide,
  • Workshop matching,
  • Troubleshooting guides,
  • Sharing your own project.

The current list of content is shown on the purchase screen. Premium is tied to your BlueGrays account and can be used on any device where you're signed in with that account. With the same account, Premium also unlocks on bluegrays.com and on the other mobile platform.

3.2 Plans and term

Premium is a subscription with a monthly or yearly billing period. The subscription continues until you cancel. The fee for the period you choose is charged in advance at the start of the period.

3.3 Automatic renewal

  • Unless you cancel, the subscription automatically renews for the same period at the end of each period, and the fee for the new period is charged to your store account.
  • Depending on the store's rules, the renewal fee may be charged within the 24 hours before the period ends.
  • Renewal is at the subscription price in effect at that time. If we raise the price, the store will let you know in advance. If the store's rules require it, you'll be asked to accept the new price. If you don't accept it or you cancel, the subscription ends at the end of the period.
  • If a payment fails, the store retries for a while. During this time, Premium may stay active for a while. If the payment still fails, Premium is turned off.

3.4 Free trial

If we offer a free trial or an introductory price, its length, the price after the trial and when you'll be charged are clearly shown before you buy. If you don't cancel the trial at least 24 hours before it ends, it turns into a paid subscription. Each account can use a free trial only once.

3.5 Changing plans

You can switch between the monthly and yearly plans in the store's subscription settings. The store's rules decide when the switch takes effect and how you're charged.

4. Personal offer ("Just for you")

  • Some users may automatically be given a time-limited discounted price based on their behavior on the paywall. The offer is only for that account and can't be transferred to anyone else.
  • How long the offer is valid is shown with a countdown on the offer screen (currently 12 hours). An account is given at most one offer every 30 days. Whether we make an offer is at our discretion. Not getting an offer doesn't mean you lose any right.
  • The offer is sold as a subscription product separate from the regular plans. A subscription you start at the offer price renews at the same discounted price for later renewals too, as long as it continues without a break. General price changes in the store are an exception to this rule. If such a change happens, you'll be informed in advance as described in 3.3.
  • If you cancel your subscription and your period ends, the regular price at that time applies when you subscribe again later. If a new offer has been assigned to you, that offer's price applies.
  • Once the offer period is over, new purchases at that price are no longer possible.
  • A reminder notification shortly before the offer ends is sent only if you've given consent to promotional messages.
  • The struck-through price shown in the offer is the regular price in effect at that time.

5. Cancellation

You can cancel your subscription at any time, without giving a reason and without any penalty. You cancel in the store where you started the subscription:

  • iPhone and iPad: Settings > [your name] > Subscriptions > BlueGrays > Cancel Subscription. Or App Store > your profile picture > Subscriptions.
  • Android: Google Play Store > your profile picture > Payments & subscriptions > Subscriptions > BlueGrays > Cancel subscription.
  • From the app: The Profile > Premium > Manage Premium Subscription link takes you straight to the store's subscription page.

When you cancel, automatic renewal stops. Premium stays active until the end of the period you paid for, and then you go back to the free version. Deleting the app or your BlueGrays account doesn't cancel the subscription. To cancel, you must do it in the store. If you have trouble cancelling, write to [email protected] and we'll help you out.

6. Right of withdrawal

Premium and Educator Pack codes become available to you electronically the moment the purchase is confirmed. For this reason, under Art. 15(1)(ğ) of the Distance Contracts Regulation (Mesafeli Sözleşmeler Yönetmeliği), there is no right of withdrawal for these purchases. On the purchase screen, you confirm that the service starts immediately.

7. Refunds

  • Because the store collects the payment, refund requests follow the store's refund rules.
    • App Store: You apply to Apple at reportaproblem.apple.com. Apple decides on the refund.
    • Google Play: You apply through Google Play's refund page or your order history. On Google Play, we can also start the refund ourselves in some cases.
  • If there's a defect in the service caused by us (e.g., not being able to access Premium content for a long time), write to us. Your optional rights under consumer legislation (re-performance, price reduction, withdrawal from the agreement) are reserved.
  • Your rights under subscription legislation, including a refund of the fee for the period remaining after termination, are reserved. You can send such requests to [email protected]. We'll review your request and, if needed, start the refund through the store or point you to the right place to apply.
  • If none of the codes in an Educator Pack have been used, you can write to us within 14 days of purchase; on Google Play we start the refund, and on the App Store we support your refund request to Apple.

8. Restoring purchases

If you change phones or reinstall the app, you can get your Premium back by using "Restore Purchases" with the same store account and the same BlueGrays account.

9. Educator Pack

9.1 Packs

Educators can buy Premium access codes in bulk to hand out to their students:

  • 5 codes, each with 1 month (30 days) of Premium
  • 10 codes, each with 1 month (30 days) of Premium
  • 5 codes, each with 1 year (365 days) of Premium
  • 10 codes, each with 1 year (365 days) of Premium

The Educator Pack is a one-time purchase and doesn't renew automatically. Its price is shown on the purchase screen.

9.2 Code delivery and duration

  • Codes are generated right after the purchase and delivered to the My Codes page in the app.
  • A code's Premium period starts on the day the student redeems the code and lasts 30 or 365 days.
  • Unused codes don't expire.
  • Each code can be used on only one account.

9.3 Transfer right

  • You can revoke a used code and transfer it, with its remaining time, to another student.
  • Each code can be transferred 1 time in monthly packs and 6 times in yearly packs.
  • When you transfer a code, the old code is revoked and the Premium of the student using it ends immediately. A new code valid for the remaining number of days is generated.

9.4 Educator's obligations

  • You may hand out codes only to your own students and only for educational purposes.
  • You may not sell codes, share them in public places or distribute them for commercial purposes.
  • On the My Codes page, you see the first name, last name, username, email and profile photo of each student who redeems a code. You may use this information only to manage the codes and may not share it with anyone else. When you hand out codes, you must tell your students, and their parents if needed, that you can see this information.
  • If we find that codes are being used in breach of these terms, we may revoke the codes concerned. Cases where a refund is required by law are reserved.

9.5 Students who redeem a code

  • A code gives you Premium for the period stated on it. It doesn't renew automatically, and you aren't charged anything. When the period ends, you go back to the free version.
  • You can't redeem a code while you have an active Premium subscription on the App Store or Google Play. If you got Premium through a code, the periods add up when you add a new code.
  • If your educator transfers your code, your Premium ends at that moment.
  • When you redeem a code, your first name, last name, username, email and profile photo are shared with the educator who gave you the code.

10. Gift Premium

From time to time, we may give some users free, time-limited Premium for promotional purposes. Gift Premium doesn't renew automatically and doesn't turn into a paid subscription. When it ends, you go back to the free version. Whether we give gift Premium is at our discretion.

11. Changes to the service

We may add new features or change existing ones to make Premium even better. If we substantially narrow the core scope of Premium to your detriment, we'll let you know at least 15 days in advance. Your right to end your subscription and your statutory refund rights are reserved.

12. Disputes

First, write to [email protected] and let's try to sort it out together. As a consumer, you can also go to:

  • For disputes below the monetary limit announced each year by the Ministry of Trade, the Consumer Arbitration Committee (tüketici hakem heyeti) where you live or where you made the transaction,
  • For disputes above the limit, mandatory mediation before filing a lawsuit, and then the consumer court where you live or where we are located.

These terms are governed by the laws of the Republic of Türkiye.

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