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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 to startDeveloper Tools
SignatureAPI offers a legally binding electronic signature HTTP API and dashboard for sending signature envelopes at scale. Pricing emphasizes per-envelope fees after included bundles, integrations, AI toolkit features, and enterprise sales for higher compliance needs.
Free to startAI contract review
Signify AI Chat helps senders and recipients examine a contract inside Signify’s document workflow. It summarizes agreements, highlights parties, dates and payments, and answers questions with links back to the document’s relevant lines. Its AI extraction feature turns selected contract details into searchable attributes.
Free trialObservability
SigNoz is an OpenTelemetry-native observability platform for logs, traces, metrics, exceptions, and AI agent telemetry. SigNoz Cloud offers usage-based billing while self-hosted SigNoz can run on your own infrastructure.
Free planImages
Signs is an NVIDIA-supported platform to learn American Sign Language with webcam-based AI feedback or contribute ASL video recordings to a growing open dataset for researchers and learners.
Free to startCode
Siimple is a hosted one-page website builder with premium themes, custom domains, contact forms, analytics, mobile editing, and AI copy assistance. Publishing requires a simple monthly subscription that includes hosting, backups, and automatic updates.
Free planSecrets Management
SikkerKey is a secrets management platform offering encrypted vaults, machine identities, audit trails, and team organization features for developers and operators. The official site covers CLI and SDK clients, AI agent integrations via an MCP server, and monthly plans that bundle included machines with per-machine overage fees for larger fleets.
Free planAssistant
Sila is an agentic WhatsApp-style messaging platform for teams and AI agents worldwide. The vendor positions it as simple instant messaging where humans and agents collaborate in the same conversations, with free entry, paid Pro and Max tiers for higher AI usage and frontier models, and an Enterprise track for SSO, compliance, and pooled usage.
Free tier unknownRobotics
Silica builds actuators that give robots force sensing at the joint so physical interactions can be measured directly instead of inferred from motor current. Q Series pre-orders target manufacturing, lab automation, and training use cases with production starting January 2027.
Free planLLM Frontend
SillyTavern is a locally installed frontend for power users to chat with text-generation LLMs and connect image and TTS models. It emphasizes deep prompt control and remains free, open-source software maintained by a community of enthusiasts.
Free tier unknownCode
Silmaril provides security for AI coding agents that self-improves against real attacks in your environment. The site frames agent inputs, trusted context, and the open web as attack surfaces, and shows a firewall-style console that inspects events, tool calls, and payloads for malicious behavior across tools like Cursor, Claude Code, and Copilot.
Free tier unknownHardware EDA
Silogy offers Viv, an on-premise AI verification engineer for digital chip design. Viv debugs failing tests using RTL, logs, waveforms, and a knowledge base to cut repetitive debug work for verification teams.
Free planDeveloper Tools
Silverback is a .NET message bus and broker integration library for event-driven architectures with first-class Apache Kafka and MQTT support. It focuses on consistent configuration and developer experience while exposing Kafka features such as partitioning, keys, tombstones, Schema Registry integration, and idempotent producers.
Free planNotes
SilverBullet is open source markdown knowledge management software that scales from personal notes to team wikis and public docs. Offerings include self-hosted Server, Desktop clients, CLI tooling, and optional hosted Cloud deployments.
Free tier unknownEmbedded Simulation
Simantic lets teams run, inspect, and test real firmware on simulated hardware from a single MCU up to connected devices. The platform targets embedded developers who need high-fidelity digital twins before shipping physical boards.
Free tier unknownEducation
SimCare provides AI client avatars for counselor training programs. Students conduct full counseling sessions with virtual clients across ages and scenarios, receiving feedback without waiting for live role-play partners.
Free tier unknownAssistant
Similarix adds semantic search and deduplication on top of Amazon S3 buckets, supporting text and image similarity queries through a dashboard or API. It advertises read-only access, multilingual search, and enterprise-scale indexing options.
Free planImages
Simpedit is a web-based image effects studio that turns a single upload into trending stylized outputs such as action figures, glitch art, halftone looks, and capsule portraits. The site emphasizes one-click presets tuned for social trends rather than manual layer editing.
Free planData Sync
Simperium is Automattic’s cross-platform data sync service for apps that need real-time mirroring, authentication, versioning, and serverless backends. The official site explains client libraries, a live dashboard, and tiered monthly plans based on API request volume from trial through enterprise contact sales.
Free planDeveloper Tools
Simple DirectMedia Layer (SDL) is a cross-platform C library for low-level access to audio, keyboard, mouse, joystick, and 2D rendering via OpenGL or Direct3D. It powers emulators, media players, and commercial games, with bindings for C++ and many other languages.
Free planSimple NixOS Mailserver is a declarative mail server module for NixOS combining Postfix, Dovecot, and related services. The GitLab project publishes release branches aligned with NixOS versions and documentation on Read the Docs.
Free planMonitoring
Simple Observability offers server monitoring, website uptime checks, metrics dashboards, log search, alert rules, and cron job monitoring with a one-command install story. The pricing page contrasts a free testing tier with predictable per-server paid pricing and optional volume discounts for larger fleets.
Free trialDocument Management
SimpleDMS is open source document management for small businesses with metadata-driven filing, inbox suggestions, duplicate detection, versioning, MCP and WebDAV access, and full-text search. It can run self-hosted or as a SimpleDMS Cloud subscription in the EU.
Free planDeveloper Tools
SimpleITK is a simplified interface to the Insight Toolkit (ITK) for medical and scientific image analysis. It exposes image filtering, registration, and segmentation workflows to Python, C#, Java, R, and other languages with examples, Jupyter notebooks, and versioned API docs.
Free planPrivacy Email
SimpleLogin is an open source email alias service that forwards messages to your real inbox so you can sign up anonymously and reduce spam. It is based in Switzerland, supports browser and mobile apps, and integrates with Proton Pass on paid tiers.
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