# AI tools for “Assistant API”

1,997 matching tools; showing 24, ranked by relevance.

Filters: `platform=website`

Related categories: [ai-api](https://openaitools.app/category/ai-api.md), [ai-assistant](https://openaitools.app/category/ai-assistant.md)

| # | Tool Name | Monthly Visits | MoM Growth Rate | Pricing Model | Summary | Why it matched | Profile (Markdown) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 1 | [Claude](https://openaitools.app/tool/claude-2) | 1,253,439,413 | +23.8% | Freemium | Anthropic's frontier AI workspace powered by Claude 5.5 for agentic coding, analysis, and nuanced writing. | category: ai-api, ai-assistant; keywords 100% | [.md](https://openaitools.app/tool/claude-2.md) |
| 2 | [OpenAI Platform](https://openaitools.app/tool/openai) | 234,678,639 | -9.6% | Paid | Enterprise developer platform and API for deploying GPT-6 Astra, Sol, Luna, and realtime multimodal agents. | category: ai-api; keywords 71%; semantic match | [.md](https://openaitools.app/tool/openai.md) |
| 3 | [DeepSeek](https://openaitools.app/tool/deepseek) | 372,761,591 | +4.3% | Freemium | High-efficiency open-weight and hosted reasoning AI powered by DeepSeek-V4 and R1 at ultra-low token costs. | category: ai-api, ai-assistant; keywords 100% | [.md](https://openaitools.app/tool/deepseek.md) |
| 4 | [Google AI Studio](https://openaitools.app/tool/google-ai-studio) | 112,620,020 | +2% | Freemium | Google's rapid prototyping IDE and developer API workbench for building multimodal applications with Gemini models. | category: ai-api; keywords 71%; semantic match | [.md](https://openaitools.app/tool/google-ai-studio.md) |
| 5 | [Google Gemini](https://openaitools.app/tool/gemini-gemini-advanced) | 2,637,398,242 | -0.1% | Freemium | Google's multimodal AI assistant powered by Gemini 4 Carbon (Gemini Carbon 4), Gemini 4 Argon, and Gemini 3.8 Flash with a 1M-token context window and Workspace integration. | category: ai-assistant; semantic match | [.md](https://openaitools.app/tool/gemini-gemini-advanced.md) |
| 6 | [Vapi](https://openaitools.app/tool/vapi) | 662,301 | -11.4% | Freemium | Build, test, and deploy production-grade voice AI agents over API | category: ai-api; keywords 100%; semantic match | [.md](https://openaitools.app/tool/vapi.md) |
| 7 | [Tavily](https://openaitools.app/tool/gpt-researcher) | 989,998 | -0.8% | Contact for Pricing | The real-time web access layer for AI agents and deep research | category: ai-assistant; keywords 100%; semantic match | [.md](https://openaitools.app/tool/gpt-researcher.md) |
| 8 | [Wasapi](https://openaitools.app/tool/wasapi-io) | 58,485 | +1.8% | Free Trial, Paid | The WhatsApp platform for teams that sell and support at scale | category: ai-api, ai-assistant; keywords 100%; semantic match | [.md](https://openaitools.app/tool/wasapi-io.md) |
| 9 | [You.com](https://openaitools.app/tool/you) | 948,349 | +7% | Freemium | Search and inference APIs that give AI models real-time web data | category: ai-assistant; keywords 100%; semantic match | [.md](https://openaitools.app/tool/you.md) |
| 10 | [DeepL](https://openaitools.app/tool/deepl) | 95,110,871 | -1.7% | Freemium | Enterprise-grade neural machine translation, AI writing refinement, and real-time voice translation across thirty-plus global languages. | category: ai-api; keywords 100% | [.md](https://openaitools.app/tool/deepl.md) |
| 11 | [AnythingLLM](https://openaitools.app/tool/anythingllm) | 512,269 | +12.9% | Freemium | Own your intelligence: a private AI assistant that runs entirely on your machine | category: ai-api, ai-assistant; keywords 100%; semantic match | [.md](https://openaitools.app/tool/anythingllm.md) |
| 12 | [Claude](https://openaitools.app/tool/claude-3) | 18,695,610 | +9.1% | Freemium, Contact for Pricing | Anthropic's AI assistant for real work, from chat to agents | category: ai-api, ai-assistant; keywords 100%; semantic match | [.md](https://openaitools.app/tool/claude-3.md) |
| 13 | [ElevenLabs](https://openaitools.app/tool/elevenlabs-io) | 42,396,771 | +26.1% | Freemium, Paid, Contact for Pricing | AI audio platform for speech, agents, music and dubbing | category: ai-api; keywords 100% | [.md](https://openaitools.app/tool/elevenlabs-io.md) |
| 14 | [Privatemode AI](https://openaitools.app/tool/privatemode-ai) | 73,071 | +28.2% | Free Trial, Paid, Contact for Pricing | Confidential AI chat and API where your data stays encrypted even during processing | category: ai-api, ai-assistant; keywords 100%; semantic match | [.md](https://openaitools.app/tool/privatemode-ai.md) |
| 15 | [Thomson Reuters](https://openaitools.app/tool/thomson-reuters) | 17,919,413 | +5.5% | Contact for Pricing | Purpose-built AI and trusted content for legal, tax, risk and trade professionals | category: ai-api, ai-assistant; keywords 100% | [.md](https://openaitools.app/tool/thomson-reuters.md) |
| 16 | [ColdIQ](https://openaitools.app/tool/coldiq-x-slack) | 195,701 | -14.8% | Freemium, Paid, Contact for Pricing | One GTM data API for prospecting, enrichment and AI agents | category: ai-api; keywords 100%; semantic match | [.md](https://openaitools.app/tool/coldiq-x-slack.md) |
| 17 | [TinyFish](https://openaitools.app/tool/tinyfish) | 1,124,952 | +199.7% | Freemium, Contact for Pricing | One API key for agent-grade web search, fetch, browsing and automation | category: ai-api; keywords 71%; semantic match | [.md](https://openaitools.app/tool/tinyfish.md) |
| 18 | [Magisterium AI](https://openaitools.app/tool/magisterium-ai) | 639,839 | +2.3% | Freemium | Catholic answer engine grounded in 30,000+ cited sources | category: ai-api; keywords 100%; semantic match | [.md](https://openaitools.app/tool/magisterium-ai.md) |
| 19 | [Jan](https://openaitools.app/tool/jan) | 291,894 | -9.6% | Free | Open-source desktop AI that runs models locally on your own machine | category: ai-api, ai-assistant; keywords 100%; semantic match | [.md](https://openaitools.app/tool/jan.md) |
| 20 | [Sendbird](https://openaitools.app/tool/sendbird) | 203,550 | +7.6% | Contact for Pricing | AI customer experience and communications infrastructure for enterprise | category: ai-assistant; keywords 100%; semantic match | [.md](https://openaitools.app/tool/sendbird.md) |
| 21 | [Qwen 4 (Alibaba Qwen4)](https://openaitools.app/tool/qwen-4) | 35,101,353 | -6.2% | Freemium | Alibaba Cloud's 4th-generation multimodal AI assistant and foundation model lineup (Qwen4-Max, Qwen4-Plus, Qwen4-Flash & open-weight Qwen4-27B) with 1M context. | category: ai-api, ai-assistant; keywords 100% | [.md](https://openaitools.app/tool/qwen-4.md) |
| 22 | [Atlas Cloud](https://openaitools.app/tool/atlas-cloud) | 777,031 | -16.4% | Paid | One OpenAI-compatible API for 500+ image, video, audio, and LLM models | category: ai-api; keywords 71%; semantic match | [.md](https://openaitools.app/tool/atlas-cloud.md) |
| 23 | [Deepgram Voice AI](https://openaitools.app/tool/deepgram-voice-ai) | 863,852 | +31.8% | Free Trial | Real-time speech-to-text, text-to-speech and voice agents in one API platform | category: ai-api; keywords 71%; semantic match | [.md](https://openaitools.app/tool/deepgram-voice-ai.md) |
| 24 | [BigModel](https://openaitools.app/tool/bigmodel) | 5,700,686 | -17% | Freemium | Zhipu AI's open platform for GLM large models, multimodal APIs, and agent building | category: ai-api; keywords 100% | [.md](https://openaitools.app/tool/bigmodel.md) |

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