Comparison

BlueGrays vs Tenio

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

BlueGrays

Learn electronics with interactive projects, a component catalog, and personal inventory management. Start with free projects and unlock full access to Arduino, ESP32, and IoT content with a premium subscription. Gamified learning with badges and levels keeps you motivated.

Highlights
  • Free starter projects
  • Unlimited Arduino/ESP32/IoT projects
  • Detailed circuit diagrams and code
  • Component catalog with specifications
  • Personal inventory management
  • Gamified learning with badges and levels
  • Multi-language support
Features
Read full description

Learning electronics has never been this easy and fun with BlueGrays! Start with free projects right away, and unlock all content with Premium when you're ready. Whether you're a student or a hobbyist, BlueGrays gives you everything you need. — START FOR FREE — • Begin learning electronics with curated starter projects • Explore basic components and their specifications • Try the app and see if it's right for you — EXPLORE PROJECTS (Premium) — • Unlimited access to Arduino, ESP32, ESP8266 and IoT projects • Detailed circuit diagrams, code snippets, and video tutorials for each project • See required components and add missing ones to your inventory • Rate projects and save your favorites • Track your completed projects — COMPONENT CATALOG (Premium) — • Full access to extensive electronic component database • Detailed specifications and use cases • Filter, sort, and easily find what you need • Add components directly to your inventory — MY WORKSHOP - PERSONAL INVENTORY (Premium) — • Track the components you own • Add quantities, notes, and custom names • Check for missing components before starting a project • Edit and update your inventory anytime — BADGES & LEVELS — • Earn achievement badges as you learn • Reach Bronze, Silver, Gold, Platinum, and Diamond tiers • Track your progress across categories • Stay motivated with gamified learning! — MORE FEATURES — • Push notifications for new projects • Multi-language support (TR, EN, DE, ES, FR, IT) • Favorites and completed projects list • Personal profile and progress tracking BlueGrays is built for the maker and electronics community. Download now and start your electronics journey for free! — 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/

About

Tenio

This app provides a suite of calculators and converters for electronics enthusiasts, students, and makers. It helps users quickly solve circuit tasks, decode component markings, and calculate values for resistors and capacitors, speeding up project development.

Highlights
  • Resistor color code calculator
  • SMD resistor code converter
  • LED resistor calculator
  • Series & parallel resistor calculator
  • SMD capacitor code calculator
  • Series & parallel capacitor calculator
Features
Read full description

Tenio: Electronics Toolkit Lab is a practical set of calculators and converters built for makers, students, engineers, and electronics enthusiasts. Quickly solve common circuit tasks, decode component markings, and speed up your projects—right from your phone. Key Features • Resistor Color Code → Value (and Value → Color Code) • SMD Resistor Code → Resistance • LED Resistor Calculator (ideal resistor for your LED circuit) • Series & Parallel Resistor Calculator • Trimpot Code ↔ Resistance Converter • SMD Capacitor Code → Capacitance • Series & Parallel Capacitor Calculator • Capacitor Code ↔ Capacitance Converter Whether you’re prototyping on a breadboard, working on Arduino projects, studying for exams, or designing real circuits—Tenio helps you calculate faster and build with confidence.

Screenshots

BlueGrays4 screens
Tenio4 screens

Verdict

The call

The clearest difference is rating: Tenio at 5.0 against BlueGrays's 4.4. Tenio also leads on in-app purchases (none vs 6) and ads (none vs shown). BlueGrays's advantage is update cadence (every 6 days vs every 4 months) and ratings volume (11 vs 2). On price, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. BlueGrays sells 6 in-app purchases, starting at $2.99 per month. Tenio asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Tenio holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: BlueGrays has 11 ratings behind it against 2, so its average is the more settled of the two.

UpkeepUpdate frequency

BlueGrays ships an update every 6 days, Tenio every 4 months. The most recent releases landed on September 17, 2026 and October 1, 2026 respectively.

Scorecard6 real differences · 4 level
BlueGrays versus Tenio: the parameters behind the verdict, then further details
ParameterBlueGraysTenio
PriceFreeFree
Rating4.4 (11 ratings)5.0 (2 ratings) — better
Positive reviews64.3% of reviews—
Number of ratings11 — better2
Update frequencyEvery 6 days — betterEvery 4 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.115.0 — better
Further details — not scored
Size51 MB7 MB
Age rating4+4+
DeveloperYunus Emre EkeSamuel Rodas Aroche

Customer experience

BlueGrays

All ratings10 ratings
Positive90.0%
Neutral0.0%
Negative10.0%
Written reviews14 reviews
Positive64.3%
Neutral0.0%
Negative35.7%

Tenio

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

6 purchases

BlueGrays

Subscriptions2
  • Premium (Monthly)$2.991 Month
  • Premium (Yearly)$11.991 Year
One-time4
  • 5x Aylık Eğitimci Paketi$12.99
  • 10x Aylık Eğitimci Paketi$23.99
  • 5x Yıllık Eğitimci Paketi$53.99
Show 1 more
  • 10x Yıllık Eğitimci Paketi$101.99
None

Tenio

No in-app purchases

Questions

Is BlueGrays free?
BlueGrays is free to download, with in-app purchases available.
Is Tenio free?
Tenio is free to download, with no in-app purchases.
Which has better reviews, BlueGrays or Tenio?
Tenio is rated higher. BlueGrays averages 4.4 out of 5 from 11 ratings, while Tenio averages 5.0 from 2 ratings.
Do BlueGrays or Tenio have ads?
BlueGrays shows ads; Tenio does not.
Which is updated more often, BlueGrays or Tenio?
BlueGrays ships an update every 6 days, and Tenio every 4 months. Most recently, BlueGrays was updated on September 17, 2026 and Tenio on October 1, 2026.

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