SDK Tools
50 best SDK tools and apps, curated and ranked by community upvotes on ProductCool. Updated daily as new SDK products launch.
The native in-app support chat your iOS app is missing. 💰 Make more money: send offers and paywalls in the chat ⭐ Get more App Store reviews from happy users 🔧 Fix problems in real time before users churn 🤖 AI answers from your docs, hands off to you when unsure 📥 One inbox for your whole team ⚡ One prompt setup: paste it into your coding agent, done Fully native. Works with Swift, React Native and Expo.
Give your agent superpowers. No subscriptions, no signups. With Composio Instant, your agent can search the web, find business contacts, create voiceovers, turn audio into text, and so much more. Try it free: composio.dev/instant
Introducing Trophy's MCP servers. Use your favourite AI tools to configure gamified features and control your Trophy account without touching the dashboard.
Maximem Synap is memory and context infrastructure for AI agents, so every conversation does not start from zero. It is the fastest and most accurate memory system on public benchmarks, 92% on LongMemEval and 93.2% on Locomo, with sub-15ms P75 recall. It handles entity resolution, temporal reasoning, and multi-level scoping automatically, no vector database or ranker to tune. Native across 22 frameworks including LangChain, LangGraph, and the Claude Agent SDK. Free tier, no credit card required.
Strands Harness is an SDK for building, controlling, and deploying production-ready AI agents. It provides a fully assembled, state-of-the-art agent harness with optimized defaults for tools, memory, and context management, so developers can focus on their agent's unique logic instead of infrastructure. It's designed for developers and teams building reliable, controllable AI agents that need to go from prototype to production.
Univer is a high-performance, fully customizable Office SDK that provides a unified runtime for spreadsheets, documents, presentations, databases, boards, and PDFs. It solves the problem of fragmented office tools by enabling seamless collaboration between humans and AI agents within a single, embeddable framework. It's built for developers and teams across industries who need to power complex workflows with composable office components.
Arcjet is the runtime security platform that ships in your AI code. Detect prompt injection, authorize agent tool calls, redact sensitive data, and block bots and abuse. Real-time security building blocks you call inside your app, before an action happens.
Desert Ant Labs builds small AI models that run on your phone or browser, no internet, no per-use cost. Instead of one big model doing everything, they make small ones, each nailing one task, across speech, text, and vision. Add any model in a few lines of code via one SDK. Free up to 100k monthly active devices.
Most in-app AI agents answer "how do I do this?" with a wall of text, because they can't see the screen. The Frigade Assist API is one tool call your existing agent makes. Frigade draws a step-by-step guide right on the page, hands the agent a plain answer when it can't, and tells it what the user is looking at. It knows your product because browser agents used it first, and it relearns every release. Works with the Vercel AI SDK or anything that can call a tool.
Build forms into your product with your coding agent. Fillo handles the infrastructure behind them: validation, uploads, responses, versions, and delivery.
Your agents forget everything the moment a session ends. You stuff more context into every prompt, burn tokens on redundant history, and still ship responses that feel like amnesia with extra steps. Actx0 is the memory layer your agents are missing — a drop-in infrastructure that stores what matters, retrieves it in milliseconds, and keeps working across sessions, agents, and apps. Built for production teams who care about latency, cost, and control.
The Recall.ai Startup Program gives early-stage teams reliable meeting recording infrastructure at $0.25/hour for their first 10,000 hours, plus engineer support, fast bot joins, every recording product, MCP access, and calendar integration.
PenguinHarness is an open-source self-improving harness built by the team behind LlamaFactory. Its AI-native SDK enables agents to build, evaluate, and optimize other agents. It supports 1,000+ models, reusable skills, tool and context management, automatic data generation, multi-agent evaluation, and closed-loop harness evolution. With one prompt and about $0.02, an agent can build a complete RAG application.
Effects SDK helps developers add production-ready AI video and audio effects to web, desktop, and mobile apps. Add background blur, virtual backgrounds, smart framing, lighting correction, beautification, overlays, avatars, and real-time noise suppression — all running client-side, without sending video or audio to our servers.
Native SDK is the complete toolkit for building beautiful native desktop applications: declarative markup, a predictable message-based state model, a modern component library, and its own native renderer — no browser, no WebView, no compromise.
Mozaik enables autonomous agent teams to work concurrently, react to events, communicate intelligently, and decide how collaboration should unfold during execution.
Agent 37 is managed hosting for persistent agents like Hermes, OpenClaw and ClaudeCode. So you don't need to run them on Mac minis or VPS yourself. One API call gives each of your customers their own always-on agent, from $3.44/mo. Founders use it to ship vertical agents to their own clients without babysitting servers.
Agent 37 is managed hosting for persistent agents like Hermes, OpenClaw and ClaudeCode. So you don't need to run them on Mac minis or VPS yourself. One API call gives each of your customers their own always-on agent, from $3.44/mo. Founders use it to ship vertical agents to their own clients without babysitting servers.
A macOS workbench where Claude, Codex, and Hermes run on your specs, research, and Figma files.
AEVS (Agent Execution Verification System) is a drop-in SDK that records every AI agent tool call and gives agents verifiable execution receipts. It captures the tool, inputs, outputs, status, and timing as tamper-evident proof, so teams can verify what an agent actually executed without relying on chat history or fragile logs.
A unified storage SDK for object and blob backends. One small, honest API. Web-standards I/O. An escape hatch when you need the native client.