twitterapi.io vs Cosine

twitterapi.io is a third-party developer API for reading and writing public X (formerly Twitter) data without going through X's official developer approval process. You sign up, grab an API key, and call REST or WebSocket endpoints for tweets, profiles, followers, search, trends, and posting actions. The service is operated by Prism Digital, LLC and is not affiliated with X Corp.

The pitch is speed and cost at scale. The site quotes median responses under 500 milliseconds, throughput above 1,000 requests per second, and per-call pricing that undercuts the official X API by a wide margin. Pay-as-you-go credits replace monthly platform tiers, so small scripts and large crawlers can share the same billing model.

It targets developers, data teams, researchers, and AI agent builders who need live social data in production. A native Model Context Protocol server exposes twelve read-only Twitter tools to Claude, Cursor, and other MCP clients, which makes the API a practical fit for agent workflows as well as traditional backends.

Cosine is revolutionizing the way developers interact with their codebase. Acting as an AI-powered co-developer, Cosine is designed to assist programmers by providing immediate, context-aware answers to questions about their code. This tool is not just a simple language model interface; it combines extensive heuristics such as static analysis and semantic search to deliver fully contextual insights. Whether developers seek to locate implementation of features, plan new functionality, or decode complex parts of the code, Cosine steps in to help by understanding the codebase on an intricate level. With features like indexing, semantic search, tagging, and relationship graph creation, Cosine facilitates smoother navigation and understanding of large and intricate codebases. Supported by Y Combinator, this cutting-edge tool is available for VS Code and can also be accessed from the Open VSX Registry, promising a new era of coding efficiency and knowledge transfer.