ZigBee Vs Bluetooth

Common in Both  :

Both are types of IEEE 802.15 "wireless personal-area networks," or WPANs. 

Both run in the 2.4-GHz unlicensed frequency band, and both use small form factors. 

Differences:

They are two different technologies with very different areas of application and different means of designing for those applications.

Bluetooth, as you likely know, eliminates cabling between electronic products and accessories, such as between computers and printers or between phones and headsets. Bluetooth users with handhelds or laptops can exchange files, business cards and calendar appointments. Bluetooth is more oriented toward user mobility and eliminating short-distance cabling; 

ZigBee aims more for grand-scale automation and remote control. 

While ZigBee is focused on control and automation, 

Bluetooth is focused on connectivity between laptops, PDA’s, and the like, as well as more general cable replacement.  

ZigBee uses low data rate, low power consumption, and works with small packet devices; 

Bluetooth uses a higher data rate, higher power consumption, and works with large packet devices.  

ZigBee networks can support a larger number of devices and a longer range between devices than Bluetooth.  

Because of these differences, the technologies are not only geared toward different applications, they don't have the capability to extend out to other applications.  

As an example, for its applications, Bluetooth must rely on fairly frequent battery recharging, while the whole goal of ZigBee is for a user to be able to put a couple of batteries in the devices and forget about them for months to years.  

In timing critical applications, ZigBee is designed to respond quickly, while Bluetooth takes much longer and could be detrimental to the application.  

Thus, a user could easily use both technologies as a wireless solution in a PAN to suit all types of applications within that network. 

Technical differences between the two protocols:

• Modulation technique
  Bluetooth: Frequency Hopping Spread Spectrum (FHSS)
  ZigBee: Direct Sequence Spread Spectrum (DSSS)
• Protocol stack size
  Bluetooth: 250 kbyte
  ZigBee: 28 kbyte
• Battery
  Bluetooth: Intended for frequent recharging
  ZigBee: Not rechargeable (one reason batteries will last for up to 10 years)
• Maximum network speed:
  Bluetooth: 1 Mbit/s
  ZigBee:250 kbit/s
• Network range:
  Bluetooth: 1 or 100m, depending on radio class
  ZigBee: Up to 70m
• Typical network join time
  Bluetooth: 3 seconds
  ZigBee: 30 milliseconds