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ESP32 vs ESP8266
Same manufacturer, same Wi-Fi heritage, different chips. The ESP8266 made cheap IoT possible; the ESP32 made it comfortable. Here is the comparison that keeps getting asked, minus the fanboy noise.
Is ESP32 Better Than ESP8266?
On paper, yes: dual 240 MHz cores against one 80–160 MHz core, about 520 KB of RAM against roughly 80 KB usable, Bluetooth LE the 8266 simply does not have, more flash, and more accurate ADC channels. But “better” has a price — the ESP32 costs more, draws more current, and brings more complexity. For a static Wi-Fi relay that never grows, the ESP8266 is still the right tool; for anything with BLE, audio, or a TLS connection, the ESP32 is the only serious choice. The deeper story is in the under-the-hood FAQ.
Which Is Better ESP32 vs ESP8266?
The job decides. BLE, big buffers, OTA, many GPIOs, TLS with a working heap → ESP32. One sensor, one relay, hard cost limit → ESP8266. Both are fine chips; the mismatch happens when you buy the 8266 and then discover you need Bluetooth.
Which Is Faster 8266 or ESP32?
The ESP32, by roughly three times on paper: two 240 MHz cores versus one 80–160 MHz core. In practice the gap feels even bigger, because the ESP32’s extra RAM and larger Wi-Fi stack mean fewer stalls — a chip can be fast and still feel slow when memory runs out every few seconds.
Are ESP32 and ESP8266 the Same?
No — same family, different chips. Whether you search “is esp32 and esp8266 same” or flip it and type “is esp8266 and esp32 the same”, the answer is identical: they are cousins, not twins. The ESP8266 is a single-core Wi-Fi chip with no Bluetooth; the ESP32 adds a second core, BLE, and several times the RAM. Pin headers on dev boards even look alike, which is why the mix-up survives.
Do ESP8266 Sketches Run on ESP32?
Mostly yes — the two Arduino cores share a lot of API, so a sketch ports with pin renames and a couple of library swaps. The common gotchas: analogRead returns 0–4095 instead of 0–1023, some pin numbers do not exist on both chips, and a few libraries have separate ESP32 forks. Expect an afternoon of porting per project; expect a weekend if you leaned on 8266-only libraries. The PlatformIO FAQ covers the cleaner way to manage both targets.
Is the ESP8266 Still Worth Buying?
Yes, in the right spot. I still buy ESP-01S modules at about $1.50 for dumb Wi-Fi bridges and garage-door triggers — one job, no BLE, no OTA, done. But for anything I expect to grow, I reach for the ESP32 even when the 8266 would technically fit, because the extra RAM kills a whole class of mystery crashes. If you are price-optimizing a product at volume, the 8266 has a long life ahead of it.
Which Has Better Wi-Fi?
Both are 2.4 GHz b/g/n with similar real-world range. The ESP32 handles Wi-Fi and Bluetooth running at the same time without dropping packets; the 8266 has no Bluetooth at all, so there is nothing to coexist with.
How Big Is the Memory Gap?
The ESP8266 has about 80 KB of usable SRAM and 1–4 MB of flash; the ESP32 has 320–520 KB of SRAM, 4–16 MB of flash, and WROVER modules add up to 8 MB of PSRAM for framebuffers and audio buffers. That gap decides which projects are even possible — it is the real reason to upgrade, more than the CPU speed. Power figures for both sit in the power FAQ.
Should I Migrate an Existing ESP8266 Project?
Only if you are adding features. A deployed, stable 8266 project that never changes can run for a decade; migration risk beats a working system’s quiet life. If you are adding BLE, bigger OTA images, or TLS with a real heap, move — and port it in the simulator first, not on the production unit.
Can I Test Both Before Buying?
Yes. Browser simulators run real compiled ESP32 firmware — Wi-Fi, sensors, serial, the works — and the same code flashes to hardware later. Try it free before you order either chip.
Run the ESP32 Side Right Now — In Your Browser
The fastest way to feel the difference is to run real firmware. Our free simulator compiles actual ESP32 sketches with arduino-cli and runs them on an emulated chip — no install, no account, no hardware. (There is no equivalent free browser simulator for the ESP8266, which is one honest point in the ESP32 column when you are learning.)
Try these two, straight from the examples library:
- Blink an LED on ESP32 — the classic first sketch. The Serial Monitor should read:
ESP32 Blink ready!
LED ON
LED OFF
LED ON
...One line per state change, every 500 ms — exactly what the sketch’s Serial.println() calls produce.
- Scan for Wi-Fi networks on ESP32 — the radio side of the comparison, live:
ESP32 WiFi Scanner
==================
Scanning for networks...
Found 3 networks:
1: HomeNet -52 dBm
2: CoffeeShop -67 dBm
3: Neighbor-5G -78 dBmThe SSIDs and signal strengths depend on the simulated radio environment; the format is what the sketch prints.
Run both, then decide. If your project needs the muscle — dual core, Bluetooth, more GPIO — the ESP32 examples will feel roomy. If it is a one-sensor Wi-Fi gadget, either board does the job, and the ESP8266 saves you a dollar.