How to Add Sentiment Analysis to Any App in 5 Minutes (Free API)

Alexey D — Mon, 04 May 2026 18:31:26 +0000

Most text analysis solutions fall into one of two problems:

Too expensive — OpenAI API costs money for every call
Too complex — Hosting your own Hugging Face model requires infra, GPU, maintenance

I built TextAI Pro — a lightweight REST API that does the job without the overhead.

What it does

Two endpoints:

POST /analyze

Sentiment: positive / negative / neutral
Confidence score (0–1)
Top keywords
Word count

POST /summarize

Auto-summary of any text
Returns original length vs summary length

Quick start

Python

import requests

url = "https://textai-pro.p.rapidapi.com/analyze"
headers = {
    "X-RapidAPI-Key": "YOUR_KEY",
    "Content-Type": "application/json"
}
payload = {"text": "This product is absolutely amazing, I love it!"}

r = requests.post(url, json=payload, headers=headers)
print(r.json())

Response:

{
  "sentiment": "positive",
  "confidence": 0.92,
  "keywords": ["product", "amazing", "love"],
  "word_count": 8
}

JavaScript

const response = await fetch("https://textai-pro.p.rapidapi.com/analyze", {
  method: "POST",
  headers: {
    "X-RapidAPI-Key": "YOUR_KEY",
    "Content-Type": "application/json"
  },
  body: JSON.stringify({ text: "Great customer service, highly recommend!" })
});
const data = await response.json();
console.log(data);

Use cases

Review monitoring — analyze customer feedback automatically
Content moderation — flag negative or toxic content
CRM enrichment — tag support tickets by sentiment before routing
Chatbot routing — detect frustrated users and escalate
News monitoring — track sentiment around keywords or brands

Pricing

Plan	Price	Rate limit
BASIC	Free	50 req/hr
PRO	$9.99/mo	1,000 req/hr
ULTRA	$29.99/mo	10,000 req/hr

Try it

TextAI Pro on RapidAPI

Free tier, no credit card required. Sign up to RapidAPI (free) and subscribe to BASIC to start.

Built this for a side project where I needed bulk sentiment analysis on customer reviews. OpenAI was too expensive for 50k+ records per day. This runs on dedicated infra and costs a fraction.

Feedback welcome — especially on what other endpoints would be useful.

DEV Community: Alexey D