Arduino Uno R4 vs Arduino Uno Rev3
Side-by-side comparison of features, pricing, ratings, and alternatives.
The Arduino Uno R4 is the latest revision of the world's most popular beginner microcontroller board, now powered by a 32-bit Renesas RA4M1 processor - a major jump from the original 8-bit design while keeping the same beginner-friendly form factor and pin layout. It remains the standard starting point for electronics education, supported by an enormous library ecosystem and the simple Arduino IDE, making it approachable for students and hobbyists building their first circuits. The WiFi variant adds built-in wireless connectivity for IoT projects, while a built-in 12x8 LED matrix on the WiFi model enables simple visual output without extra components.
The Arduino Uno Rev3 is a compact development board based on the ATmega328P microcontroller. It offers 14 digital I/O pins, 6 analog inputs, and a USB interface for easy programming. Its robust design, extensive community support, and open-source hardware make it ideal for learning electronics, building prototypes, and creating interactive projects.
Around $20-27 depending on the variant.
- Extremely beginner-friendly
- Huge tutorial and library ecosystem
- Backward compatible with existing shields
- Affordable entry point
- Low cost entry point
- Large community and library support
- Simple USB programming
- Robust and well‑documented
- Less powerful than Raspberry Pi for compute-heavy tasks
- No built-in display or OS
- WiFi variant costs more
- Limited processing power compared to newer boards
- No native Wi‑Fi or Bluetooth
- 5 V logic may require level shifting for 3.3 V devices
What reviewers say
Arduino Uno R4 Reviews
4.5 (2)Highly recommend Arduino Uno R4
I picked up Arduino Uno R4 a while back and haven't looked back. Huge tutorial and library ecosystem. One minor gripe: wifi variant costs more, but it hasn't been a dealbreaker. Would recommend.
Does exactly what we need
Been a regular user of Arduino Uno R4 for a while now. Affordable entry point. No major complaints so far. Would recommend.
Arduino Uno Rev3 Reviews
No reviews yet.
More alternatives & similar tools
Alternatives to Arduino Uno R4
View all →
Alternatives to Arduino Uno Rev3
View all →
An ultra-small Arduino-compatible microcontroller powerhouse designed for space-constrained projects.
A high-performance ARM Cortex-M7 development board designed for demanding embedded applications.
A compact and versatile development board powered by the ESP32 microcontroller for IoT applications.
The Verdict
AI-generated from listing dataBoth boards are beginner‑friendly Arduino microcontrollers, but the Uno R4 adds a newer 32‑bit processor and optional Wi‑Fi at a similar price, while the classic Uno Rev3 is the proven low‑cost, fully documented option.
Key differences
- •Processor: R4 uses a 32‑bit Renesas RA4M1; Rev3’s processor not specified in the provided data.
- •Connectivity: R4 offers an optional built‑in Wi‑Fi; Rev3 has no native wireless.
- •Compatibility: R4 is backward compatible with classic Uno shields; Rev3 is compatible with existing Arduino shields but no mention of backward compatibility.
- •Warranty: Rev3 includes a 1‑year warranty; R4 warranty not specified.
- •Price range: R4 listed $20‑27 depending on variant; Rev3 MSRP $22.
Performance
R4 specifies a 32‑bit Renesas RA4M1 processor, giving it higher compute capability than Rev3, whose processor details are not provided.
Build quality
Both are open‑source Arduino boards with similar form factor; no differing build‑quality details are given.
Connectivity
R4 can include built‑in Wi‑Fi; Rev3 has no native wireless capability.
Power & efficiency
No specific power consumption or efficiency data are provided for either board.
Compatibility
R4 is explicitly backward compatible with classic Uno shields, ensuring seamless upgrade from older projects.
Price & value
R4 costs $20‑27 depending on variant; Rev3 MSRP $22, making their price points effectively comparable.
Warranty & support
Rev3 includes a 1‑year warranty; R4 warranty information is not specified.
Choose Arduino Uno R4 if…
Ideal for users wanting newer processing power and optional Wi‑Fi while staying within the classic Arduino ecosystem.
Choose Arduino Uno Rev3 if…
Best for budget‑conscious beginners who need a proven board with a guaranteed 1‑year warranty.
Common questions
Is the Uno R4 compatible with shields I already have for an Uno Rev3?
Yes, the R4 is described as backward compatible with classic Uno shields.
Do either of the boards include built‑in Wi‑Fi?
Only the Uno R4 offers an optional built‑in Wi‑Fi variant; the Uno Rev3 has no native Wi‑Fi.
Which board comes with a warranty?
The Uno Rev3 lists a 1‑year warranty; the Uno R4 does not specify any warranty in the provided data.