Best 28 Semantic Search Tools in 2026

AI-driven search and discovery of scientific literature
Semantic Reader for augmented reading
API for developers
Search 226,403,244 papers from all fields of science

Use the search bar to find papers from all fields of science. Explore the Semantic Reader for an augmented reading experience. Utilize the API for developers to build scholarly apps.

Orchestration
SDK
Prompting
Evaluations
Retrieval
Deployment
Observability
Visual Workflow Builder
LLM Playground

Vellum AI can be used to build AI systems, from basic prompts to agentic workflows, using its Workflows IDE. Users can define, edit, and run code or UI, and push/pull changes between the two. The platform also allows for evaluating AI system quality with pre-made or custom-built metrics and deploying AI updates with easy integration and one-click deploy.

Codebase understanding
Autonomous task execution
Real-time collaboration
Native workflow integration
Instant feedback

Assign tasks from Jira or Linear, collaborate in real-time, and integrate with Slack. Try it for free on open-source repositories or sign up for your own codebase.

ENL Semantic Rewriting
One-Click Rewrite
Mass Export (up to 1,000 articles)
Side-by-side comparison
Stock photo integration
Bulk article rewriting
Paragraph creation

Monthly $47 per month ENL Rewriting Algorithm, Rewrite Unlimited Articles, 1,000,000 AI Credits per month, Most Advanced Rewriter
Yearly $197 per year (Spring Sale: $77 per year after 5-day free trial) ENL Rewriting Algorithm, Rewrite Unlimited Articles, 1,000,000 AI Credits per month, World's Most Advanced Rewriter, Bonus: 8 Million Relevant Videos, Bonus: 10 Free Seed Articles
Lifetime $497 single payment ENL Rewriting Algorithm, Rewrite Unlimited Articles, 1,000,000 AI Credits per month, Most Advanced Rewriter

To use Spin Rewriter AI, paste your article into the editor, use the 'One-Click Rewrite' feature to make it unique, and then 'Export' to generate up to 1,000 variations of the original article.

Content Generation
Image Generation
AI Form Creation
Chatbot Deployment
WooCommerce Integration
AI Training
Embeddings

Free $0 / forever Basic AI features
Pro $9.99 / month Multi-site license, Priority support, Regular updates, Advanced integrations

Install the AI Power WordPress plugin. Connect to your desired AI provider (OpenAI, Google, etc.). Use the built-in AI tools for content generation, chatbot deployment, form creation, and more.

Content Strategy planning and optimization
AI-powered Content Writer
Reporting and analytics
Team Management
Generative AI content creation
Seamless Integrations

Enterprise $297 *12 / yearly For a corporates with multiple websites and languages, ready to control and scale content. Includes 50 content strategy, 500 content writer, AI: up to 750 000 words, 50 projects/folders, 1000 Plagiarism checks, 30 000 Backlinks checks, Editor integration with own CMS, Extended API access, Personal onboarding
Agency $147 *12 / yearly For an agency with engaged teams and multiple customers, eager to work on the next level. Includes 25 content strategy, 250 content writer, AI: up to 500 000 words, 25 projects/folders, 500 Plagiarism checks, 10 000 Backlinks checks
Business $77 *12 / yearly For a larger business working on several domains. Includes 10 content strategy, 100 content writer, AI: up to 300 000 words, 10 projects/folders, 200 Plagiarism checks, 10 000 Backlinks checks
Freelance $37 *12 / yearly For a copywriter delivering outstanding results to clients and own websites. Includes 5 content strategy, 50 content writer, AI: up to 150 000 words, 5 projects/folders, 100 Plagiarism checks, 1 000 Backlinks checks

Contadu helps you to plan, write and optimize content with user intent in mind! By analyzing competitors and user intent, you will improve the SEO performance and reach of your content. Create optimized content using AI tools and semantic analysis (NLP). Present results in clear, simplified reports. Effectively manage both internal and external tasks.

AI-powered chat interface for knowledge exploration
Proprietary RAG system to overcome LLM data limitations
Semantic search and data analysis
Data aggregation from internal and external sources
Chrome extension for easy data import

Essential $0 /mo Pages 250, AI Prompts 25, Seats 1
Individual $40 /mo Pages 10,000, AI Prompts 200, Seats 1
Business $750 /mo Pages 100,000, AI Prompts 2500, Seats 10

Users can upload and bundle their data into the platform. Alani AI then analyzes the data, allowing users to engage in real-time conversations with their bundled data through a chat interface to explore, question, and discover new perspectives.

Topic Planner
SEO Tools
Internal Linking Automation
Content Optimization
Social Media Management
AI Writing Assistant
Schema Markup

FREE PLAN Free For just the social love… Optimize content twice a month, Internally link 25 pages, Keyword research, Social Media automation, Limited AI assistant
FREELANCER US$49/m 100 pages and grow as needed, Improved content audits, Writer access, Content Planner, Fully AI content enabled
AGENCY $196 /month Everything in Freelancer Plus: Start with 430 pages and grow, API Access, Unlimited Topic Trends data, Unlimited projects and users, Customer login options
ENTERPRISE 100,000+ URLs All the Agency features plus: Dedicated infrastructure, 100,000+ pages for internal links, Tailored contracts, Dedicated account manager, Workflow control over every link

Use Inlinks to analyze your website, optimize content with AI, automate internal linking, plan topics, and manage social media posts all from one dashboard.

Automatic screenshot and sound recording
Semantic search for memories
AI-powered information search and generation
Local data processing and encryption
High compression of recordings

MemFlow captures data from your Mac's screen, speaker, and microphone. Screenshots and audios are converted to text using OCR and ASR. Users can search texts or send texts to ChatGPT to generate new content. To install, visit https://memflow.ai and click the "Join Alpha Test" button.

Semantic & keyword search
Edit & compare fields
PII, duplicates, language detection, or custom signal
Fuzzy-concept search with refinement
Blazing fast dataset computations
Clustering and titling of large datasets
Embedding datasets at high token rates
Accelerating data transformations

To get started with Lilac, install it using pip: `pip install lilac`. Then, use the Python User Interface to interact with your data.