# BlueGrays - Arduino & ESP32 — Pico Projects, Code & Circuits > Electronics project guide with code, diagrams, tools, and component catalog for microcontrollers. (iPhone/iPad app by Yunus Emre Eke.) - Source: https://appshunter.io/ios/app/bluegrays-arduino-and-esp32/id6502332602 (this page in markdown: same URL + `.md`) - Developer: [Yunus Emre Eke](https://appshunter.io/developer/1713998736) - Category: Education, Developer Tools - Price: Free with in-app purchases - Rating: 4.20/5 from 14 App Store ratings · 14 written reviews indexed - Age rating: 4+ - Requires: iOS 15.1 · 56 MB - Languages: American English, French (France), German (Germany), Italian, European Spanish, Turkish - Released: 2024-05-28 - Data updated: 2026-11-04 - Monetization: freemium - User reviews in markdown: https://appshunter.io/ios/app/bluegrays-arduino-and-esp32/id6502332602/reviews.md ## What is BlueGrays? 160+ Arduino, ESP32 and Raspberry Pi Pico projects, each with ready-to-upload code, a circuit diagram, the parts list and a video walkthrough. Tell BlueGrays which parts you own and it shows the projects you can build right now. Plus 125+ component guides, 18 electronics calculators and pinout maps for the boards. PROJECTS • Arduino projects, ESP32 projects and Raspberry Pi Pico projects in one place • Step-by-step guide: parts, circuit, code and testing • Wokwi simulation videos in new projects: watch the circuit run before you build it • Rate projects, save favorites and track the ones you complete WHAT CAN I BUILD WITH MY PARTS • Workshop: save the components you own, with quantities • See the projects you can build with your parts and the ones missing the fewest • Project Finder: answer a few questions and get an Arduino, ESP32 or Pico project that fits you 18 ELECTRONICS TOOLS • Resistor color code and SMD code decoder • Ohm's law, LED resistor, series/parallel resistor and voltage divider calculators • 555 timer, op-amp gain, RC time constant and battery life • Capacitor code, inductor code, series/parallel capacitors and standard values • LED voltages, transistor table and logic gates • Save your calculations and share the results PINOUT • Pin maps for Arduino, ESP32 and Raspberry Pi Pico boards • Tap a pin to see what it does and what it is good for COMPONENT CATALOG • 125+ components: sensors, modules, motors, displays and more • Specs, use cases and the projects each component appears in • Add components to your Workshop straight from their page BADGES AND LEVELS • Earn badges as you learn and reach Bronze, Silver, Gold, Platinum and Diamond tiers FOR EDUCATORS • Bulk Premium code packs of 5 and 10 for your class MORE • Blog: step-by-step electronics guides on bluegrays.com • 6 languages: English, Turkish, German, Spanish, French, Italian PREMIUM Starter projects and the basic tools are open to everyone. BlueGrays Premium unlocks all projects, the full component catalog, Workshop, every tool and the pinout maps. SUBSCRIPTION INFORMATION • BlueGrays Premium unlocks unlimited access to all projects, the full component catalog, and the My Workshop inventory feature. • Payment is charged to your Apple ID account upon confirmation of purchase. • Subscription automatically renews unless cancelled at least 24 hours before the end of the current period. • You can manage and cancel your subscription in Settings > Apple ID > Subscriptions after purchase. • Privacy Policy: https://bluegrays.com/privacy/ • Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ ## Key features - 160+ microcontroller projects - Ready-to-upload code - Circuit diagrams and video walkthroughs - Project discovery based on owned parts - 125+ component guides - 18 electronics calculators - Pinout maps for popular boards ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Premium (Yearly) | $19.99 | per year | | Premium (Monthly) | $2.99 | per month | | Premium (Yearly) | $11.99 | per year | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | 50x Monthly Educator Pack | $219.99 | one-time | | 50x Yearly Educator Pack | $889.99 | one-time | | Lifetime Premium | $79.99 | one-time | | 5x Lifetime Educator Pack | $399.99 | one-time | | Lifetime Premium · Special | $49.99 | one-time | | 50x Lifetime Educator Pack | $949.99 | one-time | | 10x Lifetime Educator Pack | $749.99 | one-time | ## Is BlueGrays safe? Not enough ratings yet to assess BlueGrays. ## Is BlueGrays legit? BlueGrays - Arduino & ESP32 appears to be a legitimate app. The AppsHunter Legitimacy Score for BlueGrays is 85 out of 100 points across 7 verification signals from App Store and developer data. ## Recent user reviews (10 of 14) All indexed reviews: https://appshunter.io/ios/app/bluegrays-arduino-and-esp32/id6502332602/reviews.md ### 1/5 — Yararsız *2026-03-29, version 2.3.0* Bu uygulama yerine farklı sitelerden daha detaylı bir şekilde yararlanıla bilir uygulama içeriği çok boş ### 5/5 — Süper!! *2026-03-22, version 2.2.2* Arduino hakkında o kadar uygulama denedim ancak bu kadar profunu görmedim. Çok faydalı olmuş emeğinize sağlık… ### 5/5 — Helal be *2026-03-15, version 2.1.3* Uygulama çok iyi başlangıç için biraz daha fazla ücretsiz proje olursa daha iyi olur ama zaten paralı versyonda çok ucuz ### 4/5 — Kumsar Şenol *2026-03-14, version 2.1.3* Sorun Çözüldü . Başarılar diliyorum ### 5/5 — Başarılı *2026-03-13, version 2.1.3* Arduino ve ESP32 öğrenmek için çok güzel bir uygulama. Projeler ve devre şemaları oldukça faydalı. Tavsiye ederim. ### 2/5 — . *2026-03-11, version 2.1.1* Ücret ödemediğiniz sürece asıl önemli olan özelliklere erişiminiz yok ücretsiz planda sadece led yakma gibi basit çalışmaları yapabiliyorsunuz ayrıca uygulamayı indirme sebebim olan atölyem özelliğide ücretliymiş en azından deneme sürümü olabilirdi ve uygulamada gezinebilmek için bile kayıt istiyor en azından gezinmek için üyelik gerekmese iyi olurdu ### 1/5 — Uygulama içi satın alma *2026-03-11, version 2.1.1* Basit led yakma projeleri (5-10 adet) haricinde uygulamada her şey ücret istiyor. Biraz kullanıma izin verilmeli. 2 led yakmayı gösteriyor diye uygulamayı güzel ya da kötü yorumlayamayız. En azından birkaç deneme hakkı ya da deneme süresi verilmeli. ### 5/5 — Başarılı *2026-03-08, version 2.1.1* Uygulama çok başarılı , bir üniversite öğrencisi olarak aradığım şeyleri bulmamı sağladını söyleyebilirim. Özellikle tüm üniversite öğrencilerine önerdiğimi , bitirme projesi süreçlerinizde sizlere yardımcı olacağının altını çizerim. ### 5/5 — Hesap askıda kodlar gözükmüyor *2025-12-14, version 1.2.1* Uygulama çok ama çok iyi fakat hesap askıya alındığı için kodlar gözükmüyor lütfen acilen çözülsün ### 1/5 — All the accounts are suspended *2025-12-13* You can’t do anything with this stupid app. All the accounts are suspended so you have absolutely no access to the codes. ## Frequently asked questions about BlueGrays ### What kind of projects does BlueGrays offer? BlueGrays features over 160 projects for Arduino, ESP32, and Raspberry Pi Pico. Each project includes ready-to-upload code, a circuit diagram, a parts list, and a video walkthrough to guide you through the build process. ### Can BlueGrays help me build projects with the parts I already have? Yes, BlueGrays has a 'Workshop' feature where you can list the components you own. The app will then show you which projects you can build with your current parts and highlight those that are closest to completion. ### What electronics tools are included in BlueGrays? BlueGrays includes 18 useful electronics tools such as resistor color code and SMD code decoders, Ohm's law calculator, LED resistor calculator, and various other calculators for components like 555 timers and capacitors. ### Does BlueGrays offer any learning progression or gamification? Yes, BlueGrays offers a system of badges and levels. You can earn badges as you learn and progress through tiers like Bronze, Silver, Gold, Platinum, and Diamond, providing a sense of achievement. ### Is BlueGrays available on multiple platforms? Based on the provided data, BlueGrays is supported on iPhone and iPod. It is not specified if an Android version is available. ### How often is BlueGrays updated? The latest version of BlueGrays is 3.3.2, released on 2026-11-04. This indicates regular updates to improve features and content. ### What is the pricing for BlueGrays Premium? BlueGrays Premium offers monthly subscriptions at $2.99 or $4.99, and yearly subscriptions at $11.99 or $19.99. This unlocks all projects, the full component catalog, and the Workshop inventory feature. ### How do I cancel my BlueGrays Premium subscription? You can manage and cancel your subscription by going to Settings > Apple ID > Subscriptions after your purchase. The subscription automatically renews unless cancelled at least 24 hours before the end of the current period. ## Version history (last 5 releases) ### 3.3.2 — 2026-11-04 New - Redesigned Premium screens: Ohmi welcomes you, plans side by side. - Lifetime Premium: pay once, no renewals. - Educator packs: Monthly, Yearly and Lifetime; 5, 10 or 50 codes. Also - Attach a project, component or tool to your forum posts and comments. - Report forum posts and comments, and block users. - Legal section in Preferences: all agreements in one place. - Faster launch and refreshed announcement cards. - Our Instagram page in Profile. ### 3.3.0 — 2026-10-31 New: Learn - Code guide: core Arduino and MicroPython commands on short cards, each example also as blocks. - Daily questions: 5 a day, levels A1 to C2, weekly ranking and badges. - Block coding: 110 projects as blocks, step by step with "Understand the blocks". Also - Photos and code in forum comments. - Action sounds and celebrations (can be turned off in Preferences). - Better layouts with large text; fixed the screen staying dimmed. ### 3.2.0 — 2026-10-23 New: Understand the code Every project's Code step now has an "Understand the code" tab. It walks you through what the code does, piece by piece, in plain words. It also lists common mistakes with their fixes and gives you a small task to try by changing the code. Also - Refreshed sign-in screen. - Small fixes and improvements. ### 3.1.2 — 2026-10-22 • Fixed a crash on launch with some device languages • Email verification card on the profile • Buy link on component pages • Minor fixes and improvements ### 3.1.1 — 2026-10-18 Bug fixes and performance improvements have been made. We regularly update BlueGrays to make your experience smoother. ## Apps similar to BlueGrays | App | Rating | Price | Category | | --- | --- | --- | --- | | [Workshop for Arduino](https://appshunter.io/ios/app/workshop-for-arduino/id1638636973) | 3.3 (3) | Free | Education | | [Arduino Pocket Reference](https://appshunter.io/ios/app/arduino-pocket-reference/id969849288) | 2.5 (19) | Free | Education | | [Arduino Programming Tutorial](https://appshunter.io/ios/app/arduino-programming-tutorial/id6446804186) | 3.0 (1) | Free | Education | | [Arduino Programming Pro](https://appshunter.io/ios/app/arduino-programming-pro/id6447102673) | 4.6 (5) | $4.99 | Education | | [Learn Electronics & Arduino](https://appshunter.io/ios/app/learn-electronics-and-arduino/id6786012093) | 4.3 (6) | Free | Education | | [Digital Electronics Guide](https://appshunter.io/ios/app/digital-electronics-guide/id6478166232) | 5.0 (2) | Free | Education | ## More apps by Yunus Emre Eke - [El İşi Dünyası](https://appshunter.io/ios/app/el-isi-dunyas/id6470683720) - [Cardenix: AI Card Scanner](https://appshunter.io/ios/app/cardenix-ai-card-scanner/id6760647627) - [Rn Teknoloji](https://appshunter.io/ios/app/rn-teknoloji/id6762559630) - [Motordaş](https://appshunter.io/ios/app/motordas/id6793937973) - [AYNA Salon: мастера красоты](https://appshunter.io/ios/app/ayna-salon/id6819302614) All apps by Yunus Emre Eke: https://appshunter.io/developer/1713998736 ## Related topics [projects electronic](https://appshunter.io/ios/topics/projects-electronic) · [electronics learning](https://appshunter.io/ios/topics/electronics-learning) · [arduino](https://appshunter.io/ios/topics/arduino) · [esp32 kit](https://appshunter.io/ios/topics/esp32-kit) --- *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 2026-11-04.*