Best 28 Semantic Search Tools in 2025

AI-powered search engine for scientific literature
Ability to search for specific papers, authors, or topics
Access to a vast collection of scientific papers from all fields of science
Semantic understanding of research publications
API for developers to build scholarly apps
Semantic Reader (beta) for augmented scientific reading

To use Semantic Scholar, simply visit the website and enter your search query in the search form. You can search for specific papers, authors, or topics of interest. The tool will provide you with a list of relevant scientific papers from all fields of science. You can also explore the research publications, researchers, and resources available on the website.

Prompt Engineering
Semantic Search
Version Control
Testing
Monitoring

Vellum provides a comprehensive set of tools and features for prompt engineering, semantic search, version control, testing, and monitoring. Users can use Vellum to build LLM-powered applications and bring LLM-powered features to production. The platform supports rapid experimentation, regression testing, version control, and observability & monitoring. It also allows users to utilize proprietary data as context in LLM calls, compare and collaborate on prompts and models, and test, version, and monitor LLM changes in production. Vellum is compatible with all major LLM providers and offers a user-friendly UI.

Spin Rewriter stands out with its advanced features. It uses ENL Semantic Spinning technology, which understands the meaning of each word to generate human-quality content. The tool works on all devices and supports various spintax formats. With mass export, bulk article spinning, and paragraph creation capabilities, Spin Rewriter boosts content creation efficiency.

Using Spin Rewriter is easy. Simply paste your article into the editor, click 'One Click Rewrite' to create a unique version, and then hit 'Export' to generate up to 1,000 variations. You can also compare your original article with spun articles, integrate stock photos, and access detailed video tutorials for guidance.

Content strategy planner & advanced content editor
Semantic analysis and Google SERP analysis
Competitive research and content clusters
AI recommendations for content creation
Document draft generator and content score optimization
Content ideas discovery and AI writing assistance
Plagiarism checker and internal linking suggestions
Integration with Google Search Console and WordPress
Chrome extension for easy editing and exporting

Enterprise Plan For corporates with multiple websites and languages, ready to control and scale content.
Agency Plan For an agency with engaged teams and multiple customers, eager to work on the next level.
Business Plan For a larger business working on several domains.
Freelance Plan For a copywriter delivering outstanding results to clients and own websites.

To use Contadu, start by planning and optimizing your content based on user intent and Google's requirements. Utilize the AI-based semantic expertise to create a content plan, topical maps, and perform competitive research. Manage and execute your content strategy efficiently with the help of the content manager. Finally, publish and integrate your content seamlessly using the provided tools.

Summarisation
Bullet point Summarisation
Question Answering
Question Generation
AI Lookup
Semantic Search
Knowledge Evaluation

Free Plan Free Read, take notes, organize your learning materials and try Quino's AI features.
Free Student Plan Free Boost your study sessions with Quino and take advantage of all the AI tools.
Student Pro Plan $7/month Ready to deep dive into research? Need to complete a longer study? Make sure you have all tools at the ready at all times.

To use Quino, simply upload your documents, books, or research papers. You can then use the AI-powered features to generate summaries, bullet points, chat with your documents, organize your notes, and evaluate your knowledge.

AI-powered Content Writer
Image Generator
ChatGPT for chatbot creation
WooCommerce integration
Speech-to-Post
Model Comparison Tool
Semantic Search

To use AI Power, simply enter your OpenAI API key on the plugin settings page. Once your API key is entered, you can start generating content, using the title suggestion tool, converting audio to text, utilizing the semantic search feature, and comparing different GPT models.

Codebase understanding on a deep level
Indexing
Semantic Search
Tagging
Relationship Graph

To use Cosine, you can try it on an open-source repository through the website or install the VS Code extension available on the Visual Studio marketplace.

AI-powered search and generative answers
Automatic indexing of unstructured data from any source
Semantic search and keyword search capabilities
Support for video and audio transcription, image content extraction, and document parsing
Natural language queries in multiple languages
Low-code web component and open SDK for easy integration
Effortless data ingestion from any source
Multi-model generative AI selection (Private GenAI, ChatGPT, Palm2, Cohere)
Flexible deployment options - in the cloud or on-premise

To use Nuclia, you can upload data from different sources like Dropbox, Google Drive, or local files using the web application or API. Nuclia will extract the text from various file formats and languages, and generate vectors for multi-language search. It indexes the data in its database, optimized for semantic search. Users can integrate Nuclia's search capabilities into their applications using the provided low-code web component or SDK. Nuclia also offers multi-model generative AI for more advanced applications.

SEO Tool
Internal Linking Tool
Content Optimization
Social Media
AI Writing Tool
Schema Markup
Keyword Research

Free Plan Free Optimize content twice a month. Internally link 25 pages. Keyword research. Social media automation. Limited AI assistant
Freelancer $49/month Everything in Free plan. 100 pages and grow as needed. Improved content audits. Writer access. Content Planner. Fully AI content enabled
Agency $196/month Everything in Freelancer plan. Start with 430 pages and grow. API access. Unlimited Topic Trends data. Unlimited projects and users. Customer login options
Enterprise Contact Us All the Agency features. Dedicated infrastructure. 250,000+ pages for internal links. Tailored contracts. Dedicated account manager. Up to 40K pages per site

To use InLinks, sign up for an account and log in. From the dashboard, you can access different tools and features to optimize your website content. Use the SEO tool to analyze and improve your on-page SEO elements. The internal linking tool helps automate and optimize internal links. Content optimization tools guide you in creating optimized content. The social media management feature allows you to schedule and post on multiple platforms. The AI writing tool helps generate high-quality content. Schema markup and keyword research tools provide additional SEO benefits.

AI generated podcast summaries
Semantic search functionality
Q/A capability to ask questions related to the podcasts

To use Podchat, simply sign up with your email address. Once registered, you will receive podcast episode summaries directly in your inbox as soon as they are released. You can also search through your favorite podcasts using semantic search and ask questions to explore and uncover new and old insights.