The Surprising History of Spell Checkers—and What It Means for AI-Anxious Editors

The Surprising History of Spell Checkers—and What It Means for AI-Anxious Editors

artificial intelligence

Years ago, when a colleague mentioned that Microsoft Word 365’s Editor feature uses AI, I had one of those “wait, what?” moments. That little blue quill icon I'd been clicking? AI all along. By then, I’d already shifted away from copyediting to focus on developmental editing and business coaching, so I wasn’t actively using the tool—but the discovery stuck with me.

After ChatGPT came onto the scene and I started diving deep into learning about generative AI, I kept thinking about the Word Editor revelation. So, being me, I decided to dig into the history of spell-checking software—I was curious about how we got from simple spell checkers to AI-powered editing tools. What I didn't expect to find was a 65-year timeline that reads like a dress rehearsal for many of the AI conversations and debates we’re having right now. The resistance, the fear of obsolescence, the gradual (often grudging) acceptance—it was all there, decades before ChatGPT.

Here’s what I discovered.

The Dawn of Digital Spell Checking (1959 to 1970s)

Our story begins in 1959 at the University of Pennsylvania, where a team led by Zellig S. Harris and Henry Hiz created the world’s first computer program to analyze grammar. This wasn’t a spell checker yet, but it laid the groundwork for everything that followed.

Two years later, Les Earnest at MIT took things further. While working on a cursive handwriting recognizer (because apparently he liked to tackle the hard problems first), he created what's considered the first true spelling checker. Armed with a list of 10,000 common English words, this program could identify when handwritten words didn’t match anything in its database.

The real breakthrough came in 1971 when Ralph Gorin created SPELL at Stanford’s AI Lab. Unlike its predecessors, SPELL was interactive—it could actually suggest corrections. Think about that for a moment: More than 50 years ago, a computer program was making editorial suggestions. Gorin’s creation spread globally through ARPANET (the precursor to the internet), introducing the wider academic community to automated spell checking.

By the late 1970s, spell checkers had become standard on mainframe computers at universities and large corporations. Linguists from Georgetown University even developed specialized systems for IBM. But these tools required expensive mainframe access and technical expertise that put them out of reach for everyday professionals.

Spell Check Goes Mainstream (1980s)

Everything changed in 1980 with the release of WordCheck for Commodore systems. For the first time, regular people could buy spell-checking software for their personal computers. The marketing was so enthusiastic that it often used all-caps to make its point—here’s one early advertisement promising that the program “checks EVERY SINGLE WORD”!

When IBM released its PC in 1981, software developers scrambled to create spell checkers for the new platform. The competition was fierce, with multiple companies racing to capture this emerging market. But the real revolution came in the mid-1980s when WordPerfect and WordStar did something radical: They built spell checking directly into their word processors.

This integration seems obvious now, but at the time it was controversial. Standalone spell-checker companies suddenly faced extinction as their product became a built-in feature. Critics worried that making spell checking too easy would make writers lazy and careless.

The Features We Take for Granted (1990s to 2000s)

The 1990s brought innovations that would define how we think about spell checking. In 1993, Dean Hachamovitch at Microsoft invented AutoCorrect for Word 6.0. This feature—which automatically fixed common typos as you typed—was initially met with skepticism. Writers complained about losing control over their text. Editors worried it would mask persistent errors that writers needed to learn from in order to improve. Some even predicted that writers would no longer see the need to hire professional copyeditors—if the computer could catch these errors, why pay a human?

Then came 1995 and those famous red squiggly underlines in Word ’95. Background spell checking had arrived. No longer did you need to run a separate check at the end of your document; the computer would flag potential errors in real time. Again, the response was mixed. Some embraced the efficiency, while others found it distracting and intrusive.

By 2006, spell checking had escaped the bounds of word processors entirely. Firefox 2.0 brought spell checking to web browsers, extending this technology to email, forums, and anywhere else people wrote online. Spell checking had become part of the invisible infrastructure of...