State of the Art

Apple’s Silky Smooth Integration May Seduce You for Keeps

By FARHAD MANJOO

Stuart Goldenberg

The tech giant has succeeded in ensuring that its phones, tablets and computers work seamlessly together. You might never leave.

Jim Wilson/The New York Times

The iPad Air 2, left, and the iPad Mini 3.

IPad Air 2 and Mini 3 Review: Fantastic, but Largely Unnecessary, Tablets

By FARHAD MANJOO

The iPad Air 2 is substantially faster than its predecessor, and both it and the Mini 3 include Touch ID and Apple Pay. Needless to say, both products are costly.

Eric Risberg/Associated Press

Apple says Apple Pay is more secure than a traditional credit card payment, because the system sends one-time codes to merchants to complete purchases rather than actual credit card numbers.

Machine Learning

Apple Pay: Seamless in Stores, but Quirky Online

By MOLLY WOOD

Integrating the new payment system with varied apps still has some flaws, but brick-and-mortar purchases are easy and fun.

As Apple Pay Arrives, Witnessing the Next Step in Money. Maybe. NYT Now

App Smart

Don’t Be Afraid of These Halloween-Themed Apps

By KIT EATON

Play games, and get ideas for pumpkin carving, recipes and more for the spooky holiday.

App Smart Video: Finding Halloween Fun

Josep Lago/Agence France-Presse — Getty Images

Fitbit’s Flex wristband.

Fitbit Says It Will Make Changes to Address Complaints About Allergic Reactions

By RACHEL ABRAMS

The wristband will now come with a warning that it contains nickel, a common allergen used in many types of products, and a new sizing guideline to prevent users from wearing the devices too tightly.

Q&A

Exporting Video From iPhoto

By J. D. BIERSDORFER

Plus, tips on removing malicious software from browsers.

Q&A

Swatting Spam on Twitter

By J. D. BIERSDORFER

Plus, how to wirelessly connect an old PC to the Internet.

More State of the Art

State of the Art

The Samsung Galaxy Note 4 phone includes a stylus, a handy tool for interacting with the device’s large display.

Samsung’s Superior Note 4 Smartphone Gives Glimpse of Computing’s Future

By FARHAD MANJOO

With a half-dozen new features that will delight users, Samsung’s latest smartphone may have its owners forgetting about all their other computers.

App Smart

With Mobile ‘God Games,’ Unleash Your Inner Benevolent Creator — or Wrathful Deity

By KIT EATON

A roundup of so-called god games, which let you control the world.

App Smart Video: Playing ‘God Games’

More Machine Learning

Machine Learning

Businesses Are Turning to Beacons, and It’s Going to Be O.K.

By MOLLY WOOD

Beacons, tiny radio transmitters that send signals to phones close by, have quickly become a new front in the chase to find you whenever and wherever you are.

Machine Learning

4K TVs have displays with twice the vertical resolution and twice the horizontal resolution of high-definition TVs.

Sharper Image From 4K TVs Is a Gimmick Worth Having

By MOLLY WOOD

History shows that better-looking sets with bigger displays will win consumers over, as long as the price is right.

Machine Learning Video: The Race for the 4K Television Audience

More App Smart

App Smart

Positive Thinking, With a Little Help From Your Phone

By KIT EATON

A roundup of apps to help you get happy, or at least figure out what is stressful in your life.

App Smart Video: Finding Happiness

App Smart

With Mobile ‘God Games,’ Unleash Your Inner Benevolent Creator — or Wrathful Deity

By KIT EATON

A roundup of so-called god games, which let you control the world.

App Smart Video: Playing ‘God Games’

More Gadgetwise

Gadgetwise

Fashion and Functionality Meet in Smart Jewelry

By GREGORY SCHMIDT

Manufacturers are teaming up with designers to produce stylish bracelets, rings and cuff links that are also tech devices.

Gadgetwise

Traded-in iPhones at a warehouse in Louisville, Ky., for Gazelle, which offers an online trading program for cellphones. After a final offer is accepted, sellers can choose to be paid by check, Amazon store credit or PayPal.

How to Get More Room in the Sock Drawer: Sell Your Cellphone

By BRIAN X. CHEN

Mailing your phone to a reseller, handing it to a cellphone store or putting it up for sale online can reduce or fully cover the price of an upgrade.

More Q&A

Q&A

Recording Live Audio Streams in Windows

By J. D. BIERSDORFER

Plus, how to clean out an iBooks library.

Q&A

Copying PC Photos to an iPhone

By J. D. BIERSDORFER

Plus, what you can back up on a Nexus tablet.

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Featured Columns

Machine Learning

A collection of Machine Learning columns from The New York Times.

State of the Art

A collection of State of the Art columns published in The New York Times.

Q & A

A collection of Q & A columns from The New York Times.

Tool Kit

A collection of Tool Kit columns from The New York Times.

App Smart

A collection of App Smart columns and articles about mobile applications from The New York Times.

More News and Reviews

Wired Well

A series from The Well blog explores how technology can help us better understand our personal health.

Interactive Feature

The Well Guide to Activity Trackers

The Times tested some of the latest and most popular trackers to compare how they work and the various features they offer.

Interactive Feature

What Your Activity Tracker Sees and Doesn’t See

High-tech fitness and activity trackers all share one thing: an accelerometer. Here’s how they work — and don’t.

Teardown Graphics

Gadgetwise

Creativity Unleashed, With the Help of a Little Pi

Raspberry Pi, a tiny computer the size of a credit card, has captured the imaginations of students, educators and tinkerers around the world since it became available in 2012.

Graphic

TOOL KIT

A Sensor Guided by Voice or Gestures

Microsoft wants the Xbox One to be the center of a home’s entertainment universe, providing Skype video calls and playing television shows, music and more.