15,347 tools
Compare plans, free tiers and API access across thousands of AI tools — every fact carries its source and check date.
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Free planResearch
Semantic Scholar is a free AI-powered search engine for scientific literature from Allen Institute for AI. It indexes hundreds of millions of papers, provides semantic search and alerts, and offers developer APIs plus an augmented Semantic Reader experience for select papers.
Free planCode
SemanticDiff provides language-aware diffs for code review in GitHub and VS Code, highlighting moved code, refactorings, and style-independent changes. It offers a free open-source tier and paid Professional seats for larger teams.
Free to startDevOps
Semaphore is a continuous integration and delivery platform with cloud, hybrid, and self-hosted deployment options for Linux, Docker, Kubernetes, iOS, and Android pipelines. It markets agent-native CI workflows, fast testboxes, monorepo support, test reports, and usage-based compute pricing per vCPU minute.
Free planCode
Semaphr is a mobile app management platform that lets teams block broken builds, force updates, and send in-app messages without waiting on app store review. SDKs cover iOS, Android, and React Native with remote version control and analytics.
Free tier unknownField operations
Semble is all-in-one operations software for integrators and field teams, covering takeoffs and design markup, quoting, scheduling, field operations, inventory, and invoicing in one workflow.
Free planCode
Semgrep is an application security platform combining AI-assisted static analysis, software supply chain scanning, and secrets detection for modern codebases. It targets security and engineering teams integrating checks into CI/CD with rules, triage, and remediation workflows.
SEO
Semrush is an online visibility suite covering SEO, keyword research, site audits, rank tracking, competitor analysis and AI search visibility tracking, sold as tiered subscriptions with project and keyword limits.
Free tier unknownAssistant
Semrush is an SEO and AI search visibility platform for keyword research, site audits, rank tracking, competitor analysis, content optimization, and marketing reports. Semrush One bundles classic SEO data with AI visibility monitoring across prompts and AI surfaces.
Free trialAI family memories
Senarra preserves family recordings, photos and stories, then supports AI conversations grounded in that archive. Guided phone interviews, voicemail import and searchable transcription help gather memories without requiring every contributor to install an app. Paid tiers add voice profiles and synthesized spoken answers.
Free planWriting
SendBridge Mail Tester is a free deliverability checker that generates a unique inbox address, analyzes inbound test messages, and scores SPF, DKIM, DMARC, Rspamd, blacklist, and content signals. It requires no signup for unlimited spam tests.
Free planWriting
Sender is an email marketing and automation platform with drag-and-drop campaigns, landing pages, popups, and transactional email for growing businesses. Pricing scales by subscriber count with a permanent free tier for smaller lists.
Free planCode
SendRaven provides email infrastructure for AI agents and applications with API, MCP, and agent-oriented sending workflows. Pricing charges for outbound emails sent while contacts and inbound replies stay unmetered.
Free planWriting
SendStreak adds enterprise-style SMTP features—retries, tracking, templates, and automations—on top of your existing email provider with pay-as-you-go pricing. It stores message metadata in the EU for GDPR compliance.
Free tier unknownAssistant
Sennu AI is an AI-native consulting firm that designs custom, model-agnostic systems for mission-critical enterprise workflows. Engagements span a paid two-week discovery audit through build and ongoing operations for regulated, high-stakes processes.
Free tier unknownResearch
Senso provides a verified-context layer so organizations control what AI agents say about their products and policies. Teams ingest ground-truth documents, evaluate how ChatGPT and other models answer, remediate gaps, and publish sources agents can cite through CLI and API tooling.
Free planCode
Sentence Transformers is a Python framework for computing dense embeddings, semantic similarity, and retrieval with transformer, cross-encoder, and sparse encoder models. Documentation covers installation, training, semantic search, and integrations with vector databases for production NLP pipelines.
Free planAssistant
Sentient OS is a free, open-source macOS menu-bar app that runs nightly on-device analysis of local files and messages, then surfaces proactive morning cards and a Sidekick agent for computer-use tasks. Users can route frontier models through their own ChatGPT, Claude, or OpenRouter subscriptions while keeping raw data on the Mac.
Free tier unknownAutomation
Sentius builds autonomous AI agents for enterprise workflows using lightweight “maps” that guide reliable execution across apps such as Salesforce, QuickBooks, SAP, and Oracle with audit trails and regression checks.
Free planCloud
Sentora is an open-source web hosting control panel for Linux servers that unifies domains, databases, mail, DNS, SFTP, and client accounts. Administrators manage reseller packages and quotas from one GPLv3-licensed interface, with modules, themes, and an API for extending billing or branding.
Free planCode
Sentry MCP is Sentry’s Model Context Protocol server that connects AI assistants to Sentry projects for searching errors, analyzing performance, triaging issues, and reading docs via OAuth. Developers add the hosted MCP endpoint to tools like Cursor or Claude Code with optional org and project scoping.
Free planVideo
SEO Roast’s YouTube Title Generator turns a video idea into multiple title options with tone and model selectors. Creators paste a topic or script summary, generate comparisons, and copy titles optimized for clarity before publishing.
Free planResearch
SeqAn is an open-source C++ library of algorithms and data structures for sequence analysis with a focus on biological data. It uses generic programming for high performance and integrates with other bioinformatics tools.
Free planDeveloper Tools
Sequo turns a plain-language web-app idea into an ordered development plan, project documents and copy-ready prompts for Claude Code or Codex. It separates manual preparation from agent tasks and uses the project documents to answer step-level questions. Changed requirements can revise later work while showing contradictions in steps already built.
Free tier unknownResearch
Serafis indexes narrative intelligence from podcasts, interviews, and independent media so investors can search transcripts by company and theme. Delivery options include a REST API, MCP server for agents, Snowflake and BigQuery sharing, and a mobile app for discovery.
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