Best AI tools for building AI products
25 reviewed tools, 16 with a free plan. Ordered by real popularity.
Last updated:
1. Hugging Face
Hugging Face brings models, datasets and AI apps together for community collaboration. It offers open-source ML libraries, a unified inference API, paid compute and enterprise tools.
Paidhuggingface.co
2. Ollama
Ollama runs open AI models on your own hardware or in the cloud. Local usage is unlimited, while cloud access offers token-based billing and subscription credits. Prompts and responses are never logged or used for training.
Free + paid plansFree planollama.com
3. You.com
You.com provides APIs for live web search, page extraction, cited answers, and web and financial research. Its Inference Router connects AI models and providers through one API with built-in search and automatic failover.
Free + paid plansFree planyou.com
4. Artificial Analysis
Artificial Analysis compares AI models and providers through independent benchmarks of quality, speed, and cost. It offers leaderboards, model recommendations, custom benchmarks, data exports, reports, and API access.
5. Dify
Dify lets teams visually build AI agents, workflows, and RAG pipelines with integrated models and tools. Deploy in the cloud or on your own infrastructure, publish apps or APIs, and monitor usage and performance.
Free + paid plansFree plandify.ai
6. Forefront
Forefront helps developers fine-tune open-source models with private data, evaluate performance, and run inference through an API. It also stores datasets, supports model exports, and scales inference automatically with usage-based billing.
Free + paid plansFree planwww.forefront.ai
7. Haystack
Haystack is a modular, open-source framework for building LLM-powered agents and applications. It combines retrieval, reasoning, memory, and tool use in customizable pipelines, with integrations and observability for production deployment.
Open sourcehaystack.deepset.ai
8. Helicone AI
Helicone combines an AI gateway with LLM observability to help teams route requests, debug applications, and analyze usage. Features include caching, rate limits, automatic fallbacks, prompt testing, and alerts.
Free + paid plansFree planhelicone.ai
9. Keywords AI
Respan combines an open-source gateway for 1,000+ AI models with agent tracing, evaluations, and monitoring. Teams can compare outputs, track costs and errors, and configure caching, fallbacks, and spending limits.
Free + paid plansFree planwww.keywordsai.co
10. Kiln
Kiln combines AI evaluations, prompt optimization, fine-tuning, synthetic data, and agent tools in a desktop workbench. Teams can collaborate through git-synced datasets and deploy tasks with its MIT-licensed Python library.
Free + paid plansFree plangetkiln.ai
11. Langfuse
Langfuse helps teams trace AI calls, evaluate agents, manage prompts, and monitor costs and latency. Available in the cloud or self-hosted, it includes datasets, experiments, dashboards, and API access.
Free + paid plansFree planlangfuse.com
12. LiteLLM
LiteLLM is an open-source, self-hosted AI gateway with an OpenAI-compatible API for multiple model providers. It offers request routing, spend tracking, budgets, rate limits, and guardrails, with optional Enterprise security and support.
Open sourceFree planwww.litellm.ai
13. LLM Stats
LLM Stats ranks and compares hundreds of AI models using public benchmarks and live API metrics. Explore scores, context windows, output speeds and pricing, including observed costs per turn.
14. Lunary
Lunary helps teams trace AI agents, analyze usage and costs, manage prompts, and review LLM responses. It offers dashboards, feedback tracking, privacy controls, and enterprise self-hosting. New cloud workspaces require payment.
Paidlunary.ai
15. Manifest
Manifest routes LLM requests across providers through one endpoint, repairs broken requests, switches providers during outages, and tracks usage and costs. Self-host it for free or use its paid cloud service.
Open sourceFree planmanifest.build
16. Maxim AI
Bifrost by Maxim AI unifies access to AI models through one API. It offers routing, provider failover, budget controls, observability, and MCP tools, with enterprise options for guardrails, SSO, and private deployments.
Open sourceFree planwww.getmaxim.ai
17. Mistral
Mistral offers open-weight models, customization tools, and AI agents for coding, research, and everyday tasks. Organizations can build applications with Studio and choose hosted, private-cloud, or on-premises deployment.
Free + paid plansFree planmistral.ai
18. Opik
Opik helps developers trace LLM calls, debug agent failures, evaluate outputs, and monitor costs and production performance. It offers test suites, AI-assisted fixes, and self-hosted or cloud deployment.
Open sourceFree planwww.comet.com
19. Phoenix
Phoenix is a local-first, open-source platform for tracing AI agents, evaluating outputs, annotating failures, and testing improvements with datasets and experiments. Run it locally or self-host it on your infrastructure.
Open sourcephoenix.arize.com
20. Portkey
Portkey connects teams to 1,600+ LLMs through one API, with routing, monitoring, guardrails, caching, and prompt management. It offers free and paid plans plus an open-source, self-hosted option.
Free + paid plansFree planportkey.ai
21. TensorFlow
TensorFlow provides APIs and libraries for creating machine learning models, preparing data, and building production pipelines. Its ecosystem supports running models in browsers and deploying them on mobile and edge devices.
22. Together AI
Together AI provides model inference APIs, managed fine-tuning, GPU clusters, code sandboxes, and storage. Teams can run text, image, video, code, and voice models using serverless or dedicated infrastructure.
Free + paid plansFree planwww.together.ai
23. Tracking AI
TrackingAI compares AI models on IQ tests and political views. Explore rankings, answer speed, cost per answer, question-level accuracy and historical trends, with access to model answers for public test questions.
24. TruLens for LLMs
TruLens is an open-source toolkit for tracing and evaluating AI agents, RAG and MCP apps. It records step-level cost and latency, offers customizable evaluation metrics, and compares app versions using live traces or datasets.
Open sourcewww.trulens.org
25. Unsloth
Unsloth runs and trains text, image, video and audio models locally on Mac, Windows and Linux. It offers no-code workflows, media generation, agent connections and an OpenAI-compatible API, with free, Pro and Enterprise plans.
Free + paid plansFree planunsloth.ai
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