Overview

TextGears checks spelling, grammar, style, and readability in its web app, while its API adds autocorrection, language detection, summarization, and keyword extraction. That range makes it a practical option for services that need more than proofreading. The API accepts HTTP or HTTPS requests and returns JSON, with a Postman collection and JavaScript library link as integration starting points.

Customers can choose an API cluster in the United States, Estonia, or Singapore. TextGears guarantees 99.9% availability for each cluster, says it is GDPR ready, and says it will not share customer data with third parties. The maker reports more than 830 companies using the API and over 10.8 million requests per day, useful context for teams weighing a service with established usage.

Key features

The API covers 11 languages: English, French, German, Portuguese, Russian, Italian, Arabic, Spanish, Japanese, Chinese, and Greek. Dialect codes include en-US, en-GB, en-ZA, en-AU, en-NZ, fr-FR, de-DE, pt-PT, and pt-BR. This gives multilingual products a useful range, though the pricing FAQ warns that TextGears AI does not support every language; standard plans are the better fit when breadth matters more than AI analysis quality.

Readability metrics depend on text size, and TextGears recommends at least 30 words for reliable results. That is a meaningful constraint for tools processing short labels, snippets, or brief messages. A documented website plugin can add checking to web pages, but its current version cannot attach to a textarea element, limiting its usefulness for common form-based workflows.

Technical support is available in English and Russian, and TextGears says it answers 96% of requests within 24 hours. Its API also offers a choice of hosting region, which can help teams align deployment with their needs.

Pricing

The Free plan costs 0.00 USD per free, billed monthly, and includes 500 requests per month, 200k characters per month, and up to 4k characters per request. It is enough for modest evaluation or low-volume use, but the monthly request and character caps make it a poor fit for a busy production service.

PRO costs 2.48 USD per month and includes unlimited checks, translations, and paraphrases of long texts, custom dictionary rules, and an option not to store texts. That is the clearest choice for individual writers or teams focused on long-text work and dictionary customization. The stated benefits do not give a separate API request quota, so readers should distinguish this plan from the quota-based API tiers.

Silver costs 29.95 USD per month. It includes 50k text-checking requests per month, 20000k translation or rephrasing characters per month, a 4k-character request limit, and a 0% payment fee; dictionary setup is unavailable. It suits API users who need a substantial but bounded quota and can work without custom dictionary setup.

Gold costs 99.95 USD per month and raises the allowance to 500k text-checking requests per month and 100000k translation or rephrasing characters per month, with requests up to 16k characters and a 0% payment fee. For higher-volume services, those larger quotas and request lengths are the main reason to step up from Silver. Platinum has custom pricing and offers millions of text-checking requests, individual character quotas and request lengths, 24/7 support, usage statistics, and AI; it is aimed at large deployments that need tailored capacity and support.

Platforms

TextGears is available as a web app and API. The web checker suits direct writing checks, while the API is the more compelling option for embedding analysis in a service. The documented website plugin's inability to attach to a textarea makes it less suitable for teams expecting a ready-made form integration.

Who it's for

TextGears identifies EdTech, HR, content and advertising services, universities, and students among its intended users. Product teams in those areas can make use of the API's combination of corrections, readability, and text-analysis functions. Students and individual writers may prefer the web checker or PRO, while teams needing broad AI language support should account for the stated language limitation before committing.

Pros and cons

Pros: The API combines correction, readability, language detection, summarization, and keyword extraction, making it relevant to more than proofreading workflows.
Pros: Eleven documented languages, several dialect codes, selectable regional clusters, and a 99.9% availability guarantee give development teams concrete integration and deployment options.
Cons: AI does not support all languages, so its language coverage may not match the API's broader supported-language list.
Cons: The Free plan's 500 monthly requests and 200k monthly characters constrain ongoing use, and the plugin cannot attach to a textarea element.
Cons: Readability recommendations depend on text of at least 30 words, reducing confidence for very short content.

Alternatives

For writers who want a browser extension and a free starting point, ProWritingAid offers a Free plan with 500 words per report run, two report runs per day, 10 Rephrases per day, and three Sparks per day. For a no-signup, offline-capable web checker, AnchorKite Readability Checker is a free alternative that runs in the browser and works offline after loading.

For an API focused specifically on readability scores, ApyHub Readability Scores Documents API has a free Starter tier with 3,000 atoms per month, one API key, 5 req/sec, one team member, and MCP access for Claude or Cursor; its Pro tier costs 16.00 USD per month and includes 100,000 atoms per month. Botoi Readability API is another API option, with a free tier offering 1,000 requests per day, 10 req/min, all 150+ endpoints, MCP server access, JSON responses, and community support; its Starter tier costs 9.00 USD per month.

For a free web checker or extension with no account requirement or usage fees, Check Readability is an alternative for personal and commercial use. Linux or Windows users who need a GPLv3 open-source tool, .docx support, and German readability rules should consider Readability Analysis Tool (RAT). Readability Formulas is another option for readers looking for online readability calculators and a Readability Scoring System across web, extension, macOS, and Windows.

Text Inspector provides API and web access, with a free tier covering 250 words and automatic deletion of data after six hours; its Standard plan is also an option for readers comparing word-based limits.

Readers comparing broader tools can also browse Readability Checkers and Grammar checkers.

Verdict

TextGears is a good fit for teams embedding spelling, grammar, readability, and text analysis into a product, especially when its API languages, regional clusters, and quotas line up with their workload. Its breadth and low-priced PRO plan are compelling, but the Free caps, limited AI language coverage, and form-plugin constraint make it less attractive for high-volume or short-text workflows without a suitable paid tier. Choose it for integrated language tooling; look elsewhere when you need universal AI coverage or a simpler standalone readability checker.

	Corrector Castellano	TextGears
Free plan	No	Yes
Free trial	No	No
Paid from	—	$2.48/mo
Open source	No	No
Platforms	Web	api, Web
Free plan	Yes	Yes
Desktop app	No	—
Mobile app	No	—
Style suggestions	No	Yes
Languages supported	—	11

Corrector Castellano vs TextGears

Corrector Castellano

TextGears