The TI-Nspire is a graphing calculator line made by Texas Instruments, with the first version released on 25 September 2007.

[2][3] In 2011, Texas Instruments released the CX line of their TI-Nspire calculators which effectively replaced the previous generation.

The updates included improvements to the original's keyboard layout, an addition of a rechargeable lithium-ion battery, 3D graphing capabilities and reduced form factor.

In 2019, the TI-Nspire CX II was added, with a boost in clock speed and changes to the existing operating system.

The TI-Nspire series uses a different operating system compared to Texas Instruments' other calculators.

The numeric is similar in features to the TI-84, except with a bigger and higher resolution screen and a full keyboard.

The feature that the numeric lacks is the ability to solve algebraic equations such as indefinite integrals and derivatives.

To fill in the gap of needing an algebraic calculator, Texas Instruments introduced the second model with the name: TI-Nspire CAS.

The CAS is designed for college and university students, giving them the feature of calculating many algebraic equations like the Voyage 200 and TI-89 (which the TI-Nspire was intended to replace).

The TI-Nspire CAS calculator is capable of displaying and evaluating values symbolically, not just as floating-point numbers.

It is accepted in the SAT and AP exams (without a QWERTY keyboard) but not in the ACT,[8] IB or British GCSE and A level.

In the United States the new calculator was listed on the TI website as a complement to the TI-Nspire with Clickpad, though it was introduced as a successor to the previous model in other countries.

The Nspire CAS Touchpad keyboard has a slightly rounded top which makes it incompatible with the emulator keypad.

To reduce theft of school-owned TI-Nspire calculators, Texas Instruments also introduced the EZ-Spot Teacher Packs with a bright, easy-to-spot, "school bus yellow" frame and slide case.

They have a thinner design, with a thickness of 1.57 cm (almost half of the TI-89), a 1,200 mA·h (1,060 mAh before 2013) rechargeable battery (wall adapter is included in the American retail package), a 320 by 240 pixel full color backlit display (3.2" diagonal), and OS 3.0 which includes features such as 3D graphing.

[9] With the exception of interchangeable TI-84 keypads, the CX series retain all features of the previous TI-Nspire models.

According to Texas Instruments, The CX is accepted in SAT, IB, AP, ACT and British GCSE and A level exams.

With the release of OS 3.0, the Lua scripting language is supported, allowing 3rd party programs to be run without the need of exploits.

The TI-Nspire Lab Cradle is marketed by Texas Instruments and developed as part of an ongoing business venture between TI and Vernier Software & Technology of Portland, Oregon.

Press-to-Test can only be disabled by connecting to another calculator or a computer with TI-Nspire compatible software installed.

Ndless was developed initially by Olivier Armand and Geoffrey Anneheim and released in February 2010 for the Clickpad handheld.

With Ndless, low-level operations can be accomplished, for example overclocking, allowing the handheld devices to run faster.

[20] Unlike Lua scripts, which are supported by Texas Instruments,[21] Ndless is actively counteracted by TI.

Texas Instruments most likely did this to free up the NAND Flash, and SDRAM in the calculator to be used by the user and operating system.

The TI-Nspire CX II version lacks 10+ MB of storage space compared to its predecessor.

The operating system has been updated frequently since 2007 (partly due to bugs and missing functions, and also to patch jailbreak exploits), one year after its release in 2006.

[31] In OS 3.2, conic equations in standard formats can be graphed and a new chemistry feature, Chem Box, allows users to write chemical notations.

[34] An indicator now displays the angle mode (Degrees, Radians or Gradians) in effect for the current application.

These features were added in this release: OS 5.2 is currently exclusive to the CX II/CX II CAS and their -T counterparts.

These features were added in this release: OS 5.3 is currently exclusive to the CX II/CX II CAS and their -T counterparts.