Top Free Spell Check tools, APIs, and Open Source models

Top Free Spell Check tools, APIs, and Open Source models

What is Spell Check API?

An AI Grammar and Spell Checker utilizes artificial intelligence to automatically recognize and correct grammatical inaccuracies and spelling errors in written content. This is accomplished by meticulously analyzing the text and cross-referencing it with a comprehensive database of grammar and spelling principles and common errors.

These applications use NLP algorithms to evaluate text, identify errors, and suggest solutions, providing writers with immediate feedback while they draft their work. Additionally, select AI Spell Check tools offer guidance on improving sentence structure, word choice, and the overall flow of the text.

Top Open Source (Free) Spell Correction models on the market

For users seeking a cost-effective engine, opting for an open-source model is the recommended choice. Here is the list of best text correction Open Source Models:

1. Enchant

Enchant is a cost-free software project created as a component of the AbiWord word processor with the objective of combining access to the different present spell-checker software. It wraps up a universal set of functionalities found in a variety of current products/libraries and presents a reliable API/ABI for that purpose.

2. LanguageTool

Individuals and businesses make use of LanguageTool, a free, internet-based grammar solution, and proofreading tool. The software helps users detect and amend grammatical and stylistic errors in their written works.

It is widely recognized for identifying errors in numerous languages, such as English, Spanish, French, German, Polish, and Russian.

3. Grammalecte

Grammalecte is a French grammar checker. The open-source program features four dictionaries for spellchecking (which can be selected from), a tool for conjugating approximately 8000 verbs, an automated text format, and a lexicographer.

4. Editsaurus

Editsaurus is an open-source, no-frills application. It is a web-based tool that tries to help you improve your writing without being overly complex to use and it succeeds in that goal. As a result, you get a bare-bones UI with one area where you may paste or write your content.

5. Pspell

The purpose of Pspell was to provide a generic interface to the system spelling checking libraries. It was, and sometimes still is, used in computer programming such as C, and is licensed under the GNU Lesser General Public License.

Cons of Using Open Source AI models

‍While open source models offer many advantages, they also come with some potential drawbacks and challenges. Here are some cons of using open source models:

  • Not Entirely Cost Free: Open-source models, while providing valuable resources to users, may not always be entirely free of cost. Users often need to bear expenses related to hosting and server usage, especially when dealing with large or resource-intensive data sets.
  • Lack of Support: Open source models may not come with official support channels or dedicated customer support teams. If you encounter issues or need assistance, you might have to rely on community forums or the goodwill of volunteers, which can be less reliable than commercial support.
  • Limited Documentation: Some open source models may have incomplete or poorly maintained documentation. This can make it difficult for developers to understand how to use the model effectively, leading to frustration and wasted time.
  • Security Concerns: Security vulnerabilities can exist in open source models, and it may take longer for these issues to be addressed compared to commercially supported models. Users of open source models may need to actively monitor for security updates and patches.
  • Scalability and Performance: Open source models may not be as optimized for performance and scalability as commercial models. If your application requires high performance or needs to handle a large number of requests, you may need to invest more time in optimization.

Why choose Eden AI?

Given the potential costs and challenges related to open-source models, one cost-effective solution is to use APIs. Eden AI smoothens the incorporation and implementation of AI technologies with its API, connecting to multiple AI engines.

Eden AI presents a broad range of AI APIs on its platform, customized to suit your specific needs and financial limitations. These technologies include data parsing, language identification, sentiment analysis, logo recognition, question answering, data anonymization, speech recognition, and numerous other capabilities.

To get started, we offer free $10 credits for you to explore our APIs. 60720 (1).png

Access AI Grammar and Spell Check providers with one API

Our standardized API enables you to integrate spell correction APIs into your system with ease by utilizing various providers on Eden AI. Here is the list (in alphabetical order):

  • Cohere
  • Microsoft Bing
  • NLP Cloud
  • OpenAI
  • Prowritingaid
  • Sapling

1. Cohere- Available on Eden AI

Cohere API is a robust tool for natural language processing that enables you to analyze text and provide suggestions for improvement. Given a list of text, it will remove improper capitalization and transform the sentence to capitalized text.

It caters to a diverse range of languages, making it suitable for international and multilingual applications.

2. Microsoft Bing- Available on Eden AI


The Bing Spell Check API is a potent resource that utilizes machine learning and statistical machine translation to furnish precise and contextually pertinent alterations. With several spell check options, users can obtain corrections that center on grammar and/or spelling. Additionally, the API can identify and amend conversational or slang terms.

Bing has the capability to distinguish between words that sound alike but have different meanings, while also being able to identify emerging brands, titles, and popular expressions.

3. NLP Cloud- Available on Eden AI

NLP Cloud offers a correction API for grammar and spelling that utilizes generative models, enabling you to effortlessly conduct corrections with remarkable outcomes. It is feasible to accurately identify mistakes and suggest flawless rectifications in a majority of languages.

You can use GPT-J, fast-GPT-J, finetuned-llama-2-70b and chatdolphin models to check your content.

4. OpenAI- Available on Eden AI

OpenAI's solution utilizes state-of-the-art deep learning algorithms, including GPT-3, to offer precise and contextually appropriate recommendations for grammatical errors. It can detect and rectify not just rudimentary grammar and spelling errors, but also more intricate syntactical errors and discrepancies in tone and style.

OpenAI's Spell Checker is exceedingly adaptable, enabling users to customize it according to their distinct requirements and proclivities. These features render OpenAI's Spell Check API a potent aid for writers, students and businesses seeking to upgrade their written communication's quality.

5. Prowritingaid- Available on Eden AI

ProWritingAid provides a thorough AI grammar correction and spell check tool with numerous advantages over rival solutions. The API analyses written content for spelling errors, grammatical mistakes, style inconsistencies, and more. With contextual suggestions and explanations, this grammar corrector enables users to comprehend why a specific error was highlighted and how to amend it.

Furthermore, ProWritingAid identifies and corrects undesirable terms, including variations and case sensitivity, and offers spelling suggestions for entities such as people, locations and objects in the millions.


6. Sapling- Available on Eden AI

Sapling's API facilitates multi-lingual use and customization through the application of dictionaries and custom mappings, enabling clients to customize the service to their specific requirements. The service provider additionally offers pre-built models for sectors like healthcare and medicine, rendering it an optimal solution for professionals working in specialized fields.

Additionally, the API offers comprehensive edits for grammar, spelling, and style to guarantee that the content is not only error-free but also reads fluidly and professionally.

Pricing Structure for Grammar and Spell Check API Providers

Eden AI offers a user-friendly platform for evaluating pricing information from diverse API providers and monitoring price changes over time. As a result, keeping up-to-date with the latest pricing is crucial.

The pricing chart below outlines the rates for smaller quantities for October 2023, as well as you can get discounts for potentially large volumes.

How Eden AI can help you?

Eden AI is the future of AI usage in companies: our app allows you to call multiple AI APIs.

  • Centralized and fully monitored billing on Eden AI for Text to Spell Check APIs
  • Unified API for all providers: simple and standard to use, quick switch between providers, access to the specific features of each provider
  • Standardized response format: the JSON output format is the same for all suppliers thanks to Eden AI's standardization work. The response elements are also standardized thanks to Eden AI's powerful matching algorithms.
  • The best Artificial Intelligence APIs in the market are available: big cloud providers (Google, AWS, Microsoft, and more specialized engines)
  • Data protection: Eden AI will not store or use any data. Possibility to filter to use only GDPR engines.

You can see Eden AI documentation here.

Next step in your project

The Eden AI team can help you with your Text-to-Speech integration project. This can be done by :

  • Organizing a product demo and a discussion to better understand your needs. You can book a time slot on this link: Contact
  • By testing the public version of Eden AI for free: however, not all providers are available on this version. Some are only available on the Enterprise version.
  • By benefiting from the support and advice of a team of experts to find the optimal combination of providers according to the specifics of your needs
  • Having the possibility to integrate on a third-party platform: we can quickly develop connectors.

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