Natural Language Processing Api
The best 50 Natural Language Processing Api AI tools - Free & Paid
Explore 50 AI for Natural Language Processing Api
hellogpt官网 is a real-time AI translation and localization platform supporting 100+ languages, including low-resource ones, for documents, images, and cross-platform workflows. It offers context-aware multi-turn translation, enterprise APIs, and privacy-focused local processing for seamless integrati
Freemium
AIMLAPI.com offers a unified API endpoint for over 400 AI models spanning chat, image, video, audio, voice, text, 3D, and OCR. It supports sandbox testing, granular access control, batch requests, and an OpenClaw runtime for secure, human‑in‑the‑loop workflows.
Freemium
GooseAI is a fast NLP-as-a-service tool that provides text completion/generation and question/answer tasks through an API.
Usage based
- $0.00011
NaturalReader AI converts PDFs, Word, ePub, web pages, and OCR text into natural‑sounding audio in 90+ languages. It supports voice cloning, offline playback, mobile and Chrome extension access, and includes captions and dyslexia‑friendly fonts.
Freemium
DeepL is an AI-powered translation tool that offers text translation from 31 languages and supports files like PDFs and Word documents. It includes a dictionary for looking up words and has both free and Pro versions with added features.
Free trial
A web‑based Microsoft AI TTS tool offering 330+ neural voices in 129 languages. Users can adjust rate, pitch, pauses, and style for news, scripts, or narration. Works across Chrome, Firefox, Edge, with an API for web integration.
Free
PlayAI turns text into natural‑sounding audio in 42+ languages using 800+ voices. Users adjust pitch, rate, volume, add SSML pronunciations, support multi‑speaker real‑time synthesis, voice cloning, and API integration for chatbots, streaming, IVR, e‑learning.
Free trial
- $29/mo
Talkpal is an AI‑powered language tutor supporting 80+ languages with interactive modes like speaking, writing, call, photo, and roleplay. It provides real‑time feedback on pronunciation, grammar, and vocabulary, personalizes practice, tracks progress, and offers certificate‑ready assessments.
Subscription
- $4.68/mo
Langsearch is a web search API that enables natural language queries and semantic reranking for improved search accuracy. It offers real-time access to diverse information, making it suitable for AI agents and applications needing enhanced search capabilities.
Free trial
Vapi is an AI tool that facilitates rapid voicebot development for various applications like customer support, sales, telehealth, etc. It provides features such as low-latency streaming, multilingual support, and customizable models to efficiently create sophisticated voice solutions.
Free trial
- $36
Voice.ai offers cloud‑and on‑prem AI voice agents for calls, scheduling, and queries, supporting 15+ languages. It provides text‑to‑speech, 10‑second voice cloning, real‑time voice change, noise filtering, and integrates with Salesforce, HubSpot, Zendesk, Slack. APIs and SDKs enable scalable deploym
Freemium
- $5/mo
Hallo offers AI‑driven language proficiency tests in 60+ languages, delivering immediate CEFR‑aligned scores and detailed feedback on fluency, vocabulary, grammar, and pronunciation. It integrates with ATS for real‑time results and secure data handling.
Subscription
AI Humanizer transforms AI‑generated text into natural, human‑like prose, using NLP to restructure sentences and replace repetitive patterns while preserving meaning. It supports eight languages and processes up to 5,000 words per use, aiding writers, marketers, and professionals.
Subscription
SpeechGen.io converts up to 2 million characters into high‑quality neural‑voice audio across 150 languages with 5,000 models. It allows voice, speed, pitch, volume control, SSML tags, background music, multi‑speaker tagging, downloadable formats, and a REST API.
Paid
- $4.99
A platform for AI-powered text and image generation, offering tools for content creation, natural language processing, machine learning, text summarization, image recognition, and visual search.
Freemium
- $30/mo
AI Translate is an automated translation API that uses advanced neural networks to deliver accurate translations in real-time across 100+ languages. It ensures contextual accuracy and offers easy integration for enhanced global communication and content localization.
Freemium
Tinq.ai consolidates enterprise files—PDFs, slides, images, databases—into a secure, searchable layer. It syncs in real‑time, mirrors permissions, and exposes an OpenAI‑compatible endpoint, enabling AI models to retrieve up‑to‑date, cited insights across Slack, Teams, Salesforce, and more.
Subscription
- $15/mo
Humanize AI Text converts AI‑generated content into natural, human‑sounding prose while preserving meaning. It works browser‑free, supports unlimited words in multiple languages, and produces plagiarism‑free output that passes AI‑detection tools.
Freemium
Chat & Ask AI combines web search, image generation, link analysis, document chat, and YouTube summarization in one interface. It offers up‑to‑date answers, multilingual support, file uploads, and a prompt library, powered by GPT‑5.2, Gemini, Claude, and Stable Diffusion XL.
Free
Detecting‑AI scans text in 50+ languages, marking AI‑generated sentences with probability scores. It integrates with Chrome, Moodle, Zapier, and offers an API, delivering up to 98% accuracy and low false‑positives while protecting user privacy.
Freemium
- $7/mo
Text2SQL.ai transforms natural‑language questions into optimized SQL queries for MySQL, PostgreSQL, Oracle, SQL Server, MongoDB, and others, using the supplied schema. It offers a public API, a local desktop app, version control, auto‑generated charts, and follow‑up query support.
Free trial
The Speak AI tool is a language data analysis and research platform with transcription, data analysis, and sentiment analysis capabilities for various types of media.
Free trial
Lingvanex delivers on‑premise machine translation and speech‑to‑text for over 100 languages, with APIs, SDKs, desktop and mobile apps, enabling secure, offline multilingual content processing, summarization, and data anonymization for business intelligence and compliance.
Freemium
Whisper API delivers fast, accurate speech‑to‑text with speaker diarization, translation, and summary in 100+ languages, supports diverse audio formats, is OpenAI‑compatible, and enables quick developer integration for streamlined workflows.
Freemium
- $0.15
OpenAI's advanced conversational AI, fueled by GPT-3.5-turbo, delivers fluent text conversations through sophisticated natural language processing. Adjustable max tokens, message size, and integration with Azure/Google APIs enhance deployment, while multilingual support ensures customizable user ex
Freemium
Nofiltergpt is an AI chat tool that offers anonymous and unfiltered conversations. It ensures data security through local cloud storage and AES encryption, supports multiple languages, and provides a RESTful API for seamless integration.
Free trial
Eden AI offers a single API that consolidates LLMs, vision, OCR, speech, translation, and more from Meta, Mistral, AWS, Azure, Google, and OpenAI. It provides smart routing, fallback, cost/latency selection, batch processing, caching, and multi‑API key management.
Subscription
Puretalk AI® is a conversational AI platform that offers voice agents and chatbots for improved customer interactions. It features multi-language text-to-speech, automation for customer service, and easy integration with existing tools for enhanced workflow efficiency.
Free trial
Humanize.im converts AI‑generated text into natural, human‑like prose while preserving meaning. It supports multiple languages, offers contextual sentiment analysis, and can bypass AI detection, helping writers, marketers, educators, and SEOs across devices.
Paid
Hume AI offers emotion‑intelligent text‑to‑speech, real‑time speech‑to‑speech, and expressive voice cloning across 100+ languages. Developers use TypeScript, Python, .NET, or Swift SDKs to build voice‑design, stage‑direction, and emotion‑analysis features for content creation.
Freemium
- $3/mo
Humanize AI transforms AI‑generated text into natural, human‑readable language, preserving meaning across multiple languages. It adds sentiment, tone, and optional emojis while bypassing AI‑content detectors, enabling bloggers, students, marketers, and business users to publish authentic content.
Freemium
SpeakPal AI offers real‑time conversation practice in 30+ languages with adaptive tutoring, instant grammar correction, and pronunciation coaching. Users can download lessons, earn QR‑coded certificates, and educators access teen‑safety mode, all syncing across web, iOS, and Android.
Free trial
AI Humanizer turns AI‑generated text into natural language while preserving meaning. It detects AI origin with leading systems, supports 50+ languages and long documents, offers Chrome extension and API, and lets users select pre‑built models or clone their own style.
Subscription
- $8.25/mo
LingoChamp is an AI‑powered platform offering personalized courses in English, Spanish, Japanese, Korean, German, and French. It creates tailored study plans, provides AI coaching, native tutor group sessions, global chat practice, business English modules, and real‑time pronunciation feedback.
Free
WebScraping.AI offers a single API that retrieves clean HTML, plain text, or JSON from any URL, handling JavaScript-heavy pages, proxies, CAPTCHAs, and retries. Users can query, extract fields, generate summaries via prompts, and integrate with SDKs or workflow tools.
Subscription
- $29/mo
Alan AI is a cloud‑based platform that builds adaptive voice assistants via lightweight SDKs. It auto‑generates code for API calls, supports knowledge‑base imports, offers a visual workflow builder, and provides enterprise‑grade deployment options with multi‑model flexibility.
Freemium
- $1
Natural Language Playlist creates music lists from textual prompts, adding tracks to Spotify. It uses curated metadata on genre, lyrics, and sonic traits, letting users craft mood‑oriented playlists or submit independent music for discovery.
Freemium
AI Studio converts natural‑language prompts into working code across C++, Python, JavaScript, SQL, CSS, HTML, and regex. It translates snippets, adds typing hints, estimates complexity, offers git/command lookup, and provides plain‑English explanations, supporting collaboration and quick prototyping
Freemium
GPTGO blends Google search with ChatGPT, presenting results and AI‑generated summaries in 100+ languages. Users get concise answers beside each result, can copy or download, and access the tool on desktop, mobile, or tablet without registering.
Free
WriteHuman AI Humanizer refines ChatGPT, Claude, Gemini, and Deepseek outputs into natural prose, preserving the author’s voice. It offers readability scanning, AI detection, multiple variations, word‑count control, and web/API access for batch workflows.
Freemium
- $0.75/mo
Alexa Translations blends infinite and neural AI modes with Retrieval Augmented Generation and client‑terminology learning. Certified translators post‑edit outputs while the unified platform manages projects, enhancing accuracy, compliance, and turnaround under SOC 2/ISO 17100 standards.
Free
All‑in‑one platform integrating GPT‑4o, Claude, Gemini, and others for unified text, image, video, and document AI. Offers summarizing, translation, prompt templates, workflow tools, quiz creation, SCORM export, web search, subtitles, dubbing. SOC II‑compliant with field‑level encryption and data is
Subscription
- $8/mo
Resemble AI delivers real‑time voice conversion and cloning from brief samples, supports 149+ languages, lets users edit audio via text, and includes deep‑fake detection, watermarking, and API integration for secure, ethical use.
Freemium
- $0.006