How to choose the best AI-powered spelling and grammar checker: three key steps

In an environment where written communication is essential—whether in corporate emails, academic essays, or digital publications—the use of AI-powered proofreaders has become a key tool. But which one is the most effective for Spanish?

Although there are dozens of options, many are developed primarily for the English language. Therefore, it's essential to analyze the features, strengths, and limitations of the most popular Spanish-language proofreaders: Correcto, Grammarly, LanguageTool, and Quillbot.

To evaluate its effectiveness, the following 53-word fragment with common errors was used:

“Migration represents a global issue. Many governments should implement more effective public policies, but sometimes the institutional response is slow and inadequately implemented, resulting in a lack of support for migrant communities. There is also misinformation surrounding this phenomenon that fuels discriminatory and xenophobic discourse.”

A human reviewer identified 12 errors, including accents, concordance, connectives, punctuation, and style.

Effective corrections: 12/12

✅ Correct all grammatical and spelling errors

✅ Improve punctuation and suggest suitable connectors

✅ Adjust the tone to be more academic

✅ Respect the original intention of the text

“Migration represents a global issue. Many governments should implement more effective public policies. However, institutional responses are sometimes slow and poorly implemented, resulting in a lack of support for migrant communities. There is also misinformation surrounding this phenomenon, which fuels discriminatory and xenophobic discourse.”

Comment: The only proofreader that offers technical precision, clear structure, and a tone appropriate for academic and professional contexts.

Effective corrections: 8/12

✅ Improve spelling and writing

❌ Rewrite sentences, slightly altering the meaning

❌ Use forced expressions

Comment: Efficient in general structure, but not reliable for texts where semantic precision is required.

Effective corrections: 6/12

✅ Covers accents and concordance

❌ Does not improve style or complex punctuation

Comment: Suitable for basic corrections, but insufficient for advanced writing.

Effective corrections: 4/12

✅ Identify common spelling mistakes

❌ Does not suggest improvements in writing or style

❌ Does not correct complex grammatical errors

Comment: Very limited for Spanish, only useful for simple corrections.

The Correcto proofreader was the only one that identified and fixed all 12 errors, maintaining consistency, a professional tone, and faithfulness to the original content. In addition to being free, it's specifically designed for Spanish speakers and offers a locally tailored experience.

Real-time correction: See suggestions as you type.

Writing recommendations: improve the clarity and structure of the text.

Punctuation suggestions: optimize the use of commas and periods, key to reading comprehension.

It can be accessed free of charge at www.correctoai.com.

In conclusion, for those seeking a reliable and comprehensive Spanish proofreader—whether in the educational, corporate, or publishing fields—Correcto is firmly established as the best option currently available on the market.