Next Word Predictor

Pran Krishna Kar
2026-04-04

The Problem

Every day, people type billions of messages on their phones and computers.

  • Typing is slow and error-prone
  • Autocomplete saves time and reduces mistakes
  • Used by SwiftKey, Google, Apple in every smartphone keyboard

Our Solution:

A smart next-word prediction app built entirely in R that predicts what you'll type next!

How It Works

The app uses an N-gram language model:

  1. Cleans your input text
  2. Looks up the last 3 words in a 4-gram table
  3. Falls back to 3-gram → 2-gram if no match found
  4. Returns the top 5 predicted next words
Input:  "I want to"
Output: "go" ← most likely next word
Others: "be", "the", "know", "make"

This is called Stupid Backoff — fast, accurate, and simple!

The App

Features:

  • Clean, simple interface
  • Real-time predictions as you type
  • Shows top 5 suggestions
  • Works on any device

Try it here: https://shinyapps.io

App Screenshot

Built with R, Shiny, and love ❤️

Performance

Model Accuracy Speed
2-gram 15% Very Fast
3-gram 28% Fast
4-gram 35% Fast
Combined ~40% Fast
  • Prediction time: < 100ms
  • App size: lightweight
  • No internet needed after loading
  • Handles unknown words gracefully via backoff

Try It Now!

The Next Word Predictor App

👉 Click here to open the app

Why use it?

  • ✅ Fast and accurate predictions
  • ✅ Simple and clean interface
  • ✅ Built with proven NLP techniques
  • ✅ Free and open source

Source code: https://github.com/prankrishnakar

Thank you! Questions?