APIs · Tools · Cashly

Build Smarter with Corenexis Ecosystem

Corenexis is a modern technology company building developer-friendly APIs, free digital tools, and smart products like Cashly. Everything you need to build, manage, and grow — in one ecosystem.

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9+
APIs Available
25+
Free Tools
99.9%
Uptime
API Active
Secure & Reliable
api.corenexis.com
// Corenexis API Integration
const response = await fetch(
  'https://api.corenexis.com/email-validator/v1',
  {
    method: 'POST',
    headers: {
      'X-API-Key': 'YOUR_KEY'
    }
  }
);
Built With Modern Technologies
Node.js
Python
React
MongoDB
AWS
Docker
SSL/TLS
REST APIs
Node.js
Python
React
MongoDB
AWS
Docker
SSL/TLS
REST APIs
Our Products

Everything You Need to Build & Manage

Corenexis offers a growing ecosystem of products — from developer APIs and free tools to smart personal finance management with Cashly.

Core Product

API Platform

Our flagship product — a comprehensive suite of RESTful APIs for developers. PDF rendering, OCR, image delivery and conversion, email validation and QR codes — nine production APIs at api.corenexis.com.

  • 9+ Production-Ready APIs
  • Detailed API Documentation
  • Secure Key Authentication
  • Developer Dashboard
Visit api.corenexis.com

Cashly — Expense Tracker

Smart expense tracker built exclusively for Indian users. Manage daily expenses, EMIs, subscriptions, debts, and credit cards — without any bank or card permissions needed.

  • Track Expenses, EMIs & Debts
  • No Bank Permission Required
  • API Integration Support
  • Android App Live on Google Play
Visit cashly.corenexis.com Get it on Google Play

Free Digital Tools

A growing collection of free web utilities — security headers checker, DNS analyzer, IP checker, encryption tools, SEO utilities, and more. No signup needed.

  • Security & Web Analysis
  • SEO & Optimization Tools
  • Developer Utilities
  • 100% Free, No Signup
Visit tools.corenexis.com

Sign in with Corenexis

Add secure sign-in to your own app with one OAuth 2.0 integration — Google, GitHub, Microsoft, magic link and password, with two-factor security and a consent screen already built in.

  • One Integration, Every Method
  • 2FA & Consent Included
  • Web, Android, iOS & Desktop
  • Free for Developers
See how it works
api.corenexis.com

Developer-Friendly APIs for Every Need

Nine production APIs behind clean REST endpoints — JSON in, JSON out, one API key.

Email Validator API

Real-time checks with DNS and MX lookup

Disposable Email API

Catch temporary and throwaway addresses

 PDF

Markdown to PDF API

Markdown into print-ready PDF or images

 PDF

HTML to PDF API

Render HTML and CSS with full modern CSS

 OCR

Image to Text API

Clean text and markdown out of any image

 OCR

PDF to Text API

Extract text, scanned documents included

 CODES

QR Code & Barcode API

QR codes, UPI payment QRs and barcodes

 MEDIA

Image Conversion API

Any format to any format, 25+ supported

 MEDIA

Image CDN API

Image delivery through a global CDN
Your appPOST /email-validator/v1
Corenexis APIauthenticate · validate
200 OK{ "valid": true }
request responsetypical round trip in a few hundred milliseconds

Ship an integration this afternoon

Every endpoint takes JSON and returns JSON, authenticated with a single key. No SDK to install, no client library to learn.

API Documentation Dashboard Login
Live on Google Play

Meet Cashly — Your Smart Expense Tracker

Take full control of your finances without sharing any bank or card details. Cashly lets you track daily expenses, manage EMIs, subscriptions, debts, and credit cards — all in one beautifully simple interface. Built exclusively for Indian users, with API integration support for AI agents and automation tools.

Daily Expense Tracking

Log every expense with smart categories

Credit Card & EMI Manager

Track due dates and payment history

Subscriptions Tracker

Manage all your recurring payments

API Integration

Connect with AI agents and tools via API

Get it onGoogle Play Start Using Cashly — Free
Live on the Play Store — free to download, built for India
Cashly on Android - no bank login, no SMS access. EMI tracker, udhaar khata, works with ChatGPT and Claude
Sales & Support

Talk to the People Who Built It

Questions before you start, a hand once you are running, or help wiring the pieces of the ecosystem together. You reach our team directly.

Sales & Pricing

Planning an integration, or need more than the free tier covers? Tell us what you are building and we will work out what fits.

Talk to sales

Technical Support

An endpoint not behaving the way the docs say? Send us the request you made and the response you got, and we will dig into it.

Get support

Ecosystem Help

Using the APIs, Cashly and Corenexis sign-in together? We will help you connect them so the pieces behave as one product.

Ask a question
Contact Our Team
accounts.corenexis.com

Sign In Once with Corenexis

Corenexis Accounts is the sign-in and identity service behind the ecosystem — and you can put it in your own app. One OAuth 2.0 integration gives your users Google, GitHub, Microsoft, magic-link and password sign-in, with two-factor authentication, a consent screen and device management already built in. Passwords and 2FA codes are never shared with an app, and every user decides exactly what each one can see.

One Integration, Every Method

Google, GitHub, Microsoft, magic link and password

Two-Factor Authentication

Authenticator codes, backup codes, device sessions

Web, Android, iOS & Desktop

PKCE and custom-scheme callbacks for native apps

Users Control Access

Review and revoke any connected app anytime

Sign in with Corenexis Manage Your Account
OAuth 2.0
Authorization Code
PKCE
# Add "Sign in with Corenexis" to your app

# 1. Send the user to us
GET https://accounts.corenexis.com/
  ?redirect=https://yourapp.com/callback

# 2. We return a 60-second, single-use code
POST https://accounts.corenexis.com/api/token

# 3. Your server gets the identity
{
  "access_token": "eyJhbGciOiJSUzI1NiJ9...",
  "user": { "id", "email" }
}
# Exchange the code for tokens (server side)

curl -X POST \
  https://accounts.corenexis.com/api/token \
  -d "grant_type=authorization_code" \
  -d "code=$CODE" \
  -d "client_id=$CLIENT_ID" \
  -d "client_secret=$CLIENT_SECRET" \
  -d "redirect_uri=$CALLBACK"

# Never run this from the browser —
# the secret must stay on your server.
# PKCE (RFC 7636) — for mobile & desktop
# apps that cannot keep a secret.

# 1. Send a challenge with the request
GET https://accounts.corenexis.com/
  ?redirect=com.yourapp://auth
  &code_challenge=BASE64URL(SHA256(v))
  &code_challenge_method=S256

# 2. Prove it with the verifier
POST /api/token  code_verifier=v

# A stolen code is useless without it.
Read the integration docs
tools.corenexis.com

Free Digital Tools for Everyone

Powerful web utilities to analyze, optimize, and secure — completely free, no signup required.

Security Headers Checker

Analyze website security headers to identify vulnerabilities and ensure best practices.

Check Now

IP Checker

Verify IP addresses, check geolocation data, and gather network information instantly.

Check IP

Encryption Tools

Encrypt and decrypt sensitive data securely with easy-to-use encryption utilities.

Encrypt Data

DNS Record Checker

Analyze DNS records to verify domain configurations and troubleshoot issues.

Check DNS

Image Alt Text Generator

Auto-generate SEO-friendly alt text descriptions to improve accessibility.

Generate

WP Link Remover

Clean up WordPress content by removing or replacing multiple links at once.

Remove Links
View All Free Tools
Why Corenexis

Built for Developers, Designed for Everyone

What makes Corenexis the right choice for your digital needs

Developer-First

Clean API design with comprehensive documentation, code examples, and quick integration guides.

High Performance

Optimized infrastructure with 99.9% uptime and globally distributed endpoints.

Secure & Reliable

End-to-end encryption, secure API key authentication, and regular security audits.

Scalable

From side projects to enterprise apps — our products scale with your needs.

How It Works

Get Started in Minutes

Whether you're using our APIs, tools, or Cashly — getting started is fast and simple.

1

Choose a Product

Pick from APIs, free tools, or Cashly based on what you need.

2

Sign Up (If Needed)

APIs or Cashly need a free account. Tools work instantly.

3

Integrate or Use

Follow clear docs for APIs, or start using tools and Cashly right away.

4

Build & Grow

Scale your apps and manage your digital life with Corenexis.

0
Powerful APIs
0
Free Digital Tools
0
Platform Uptime
0
Monthly Users
About Corenexis

Empowering Digital Growth Since 2022

Corenexis is a modern technology company building developer-friendly APIs, free digital tools, and smart products like Cashly. Founded by Raushan and led by CEO Shyamini, we are driven by a mission to make powerful technology accessible and practical for everyone.

Our ecosystem includes the API Platform (api.corenexis.com), Cashly expense tracker (cashly.corenexis.com), Corenexis Accounts single sign-on (accounts.corenexis.com), free digital tools (tools.corenexis.com), and a technology blog — serving developers, businesses, and individuals across India and beyond.

Founded
2022
Products
4+
Focus
APIs & Tools
Learn More About Us

Our Mission

To build accessible, developer-friendly APIs and smart digital tools that empower businesses and individuals to achieve more — without unnecessary complexity.

Our Vision

A digital world where powerful technology is accessible to everyone — where any developer can build exceptional products, and every individual can manage their digital life effortlessly.

Our Values

Innovation, simplicity, security, and accessibility drive everything we build at Corenexis. Great technology should be simple to use and available to all.

Corenexis Blog

Stay updated with technology insights, developer guides, API tutorials, product updates, and industry best practices. Our blog covers everything from API integration tips to personal finance management with Cashly.

API TutorialsDeveloper GuidesProduct UpdatesTech InsightsPersonal FinanceWeb Development
Visit Our Blog

blogs.corenexis.com

Ready to Build Something Amazing?

Start using our powerful APIs, explore free tools, or try Cashly for smart expense tracking. Your journey with Corenexis starts here.

Explore API Platform Talk to Our Team

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