Email OTP Authenticator – Login, Register, 2FA & Session Lock vs WP-OTP

Email OTP Authenticator is a lightweight authentication plugin for WordPress that combines passwordless login, quick registration, optional 2FA and session protection into one flexible solution. Built using independent security layers instead of a monolithic system, the plugin loads only the required components during use to keep runtime execution compact and avoid external service dependency. Delivering these key benefits: Reduce login friction Increase signup conversions Reduce password reset requests Strengthen multi-layered website security Enhance user trust with secure authentication Designed to make WordPress authentication faster, smarter and more secure. Authentication Layers The plugin is engineered around three dedicated security Layers: Access Layer Handles secure user entry through passwordless authentication. Features: * OTP Login * OTP Registration * Guest Verification * Email authorization * Fast Authentication Flow Validation Layer Adds identity confirmation and verification controls. Features: * New Device detection * Auto-popup with UI lock * Parallel login validation * Two-Factor Authentication * Login Validity Enforcement Security Layer Protects active sessions and detects abnormal activity. Features: * Dynamic Session Shield * Session Validity Check * Session Inactivity Lock * Adaptive 2FA Enforcement * Suspicious Activity Guard Lightweight By Design Built to stay lightweight. Although the complete package includes templates, images and supporting resources for setup and compatibility, the actual authentication runtime remains compact. Admin Browser Load: ~97 KB Admin PHP Runtime: ~564 KB Frontend Browser Load: ~68 KB Frontend PHP Runtime: ~274 KB Templates & visual assets: ~2.1 MB Distribution package (zipped): ~2.3 MB Distribution package (unzipped): ~3.6 MB Only required components are loaded during use. No external APIs, frameworks or unnecessary scripts. Plugin runtime execution is highly optimized and fast. However, overall performance also depends on external factors. Key Highlights Quick Login & Signup – Instant, easy, and password-free; Login & signup with OTP. Built-in Two-Factor Authentication – Additional identity protection layer. Verified Access Control – Verify visitors without account for access to restricted pages. Adaptive Session Shield – Intelligent session protection engine. Zero External Dependency – Works without third-party services. Modern Vanilla JavaScript – No jQuery dependency. Flexible Integration Options – Add authentication anywhere. Complete Admin Control – Fine-tune authentication behavior. Built-in Interface System – Attractive ready-to-use templates. Lightweight & Fast – Optimized for performance. Flexible Integration Options Add authentication forms anywhere on your website using simple integration methods. Integration methods include: Shortcode integration (auto-popup, popup or inline forms) Menu trigger integration (popup forms) Redirect support for auto-popup & inline form pages Multiple forms on the same page Easy setup without coding complexity Built-in Templates Attractive 27 ready-to-use templates with auto-popup, popup and inline support. Easy-to-apply modern designs that match your website style, with options to customize pre-built templates or create your own. Complete Admin Control Customize authentication behavior, layout options, security restrictions and verification rules with ease. Admins gain complete control over user access and interaction across the website. Zero External Dependency Run a complete authentication system without relying on any third-party services. Full data control Standalone operation No external APIs required Self-hosted OTP processing Reliable authentication flow Modern Architecture Built using modern development practices: Vanilla JavaScript implementation (no jQuery) Modular resource loading Secure token validation Compact runtime execution Optimized performance structure Ideal Use Cases This plugin is ideal for: Membership websites WooCommerce stores SaaS dashboards Community platforms Agencies managing client websites Developers needing flexible authentication Beginners and small websites needing simple security Designed to scale from beginner websites to enterprise environments. Compatibility Works smoothly with popular WordPress tools: WooCommerce Ultimate Member MemberPress BuddyPress ProfileGrid ProfilePress User Registration WP User Manager Paid Memberships Pro RegistrationMagic Forminator Login/Signup Popup plugins And many more Why Choose This Plugin FAST – Quick OTP authentication process FRIENDLY – Simple user experience SMART – Intelligent access handling SMOOTH – Clean UI integration SECURED – Strong authentication protection Basic Mode and Advanced Features Explore the default basic mode screenshots below, designed to be simple and beginner-friendly for non-technical admins. For screenshots of advanced integrations, customization, and extended functionality, visit the Plugin Showcase. Support Feedback helps improve this plugin. Send suggestions or issues to: [email protected] Notes This is the Lite version with advanced features included for exploration. Visit the plugin homepage to discover everything available across editions.

With WP-OTP you can easily set up 2 Factor Authentication with One Time Passwords for your WordPress login. This extra layer makes your WordPress site a lot more secure. The new stealth mode allows for invisible OTP code entry, making your login screen look like any other, no extra OTP code input field. Getting started After installing and activating the plugin, every user can enable WP-OTP on their profile page. It’s as easy as scanning the provided QR Code or entering the OTP secret to any OTP generator app. Then just activate it by entering the generated OTP and voilà, all set up. Now, the login requires an OTP code to succeed. Each user gets their own secret key to authenticate with, giving them control over their login security. Development This plugin is completely open source and a work of passion. If you would like to be part of it and join in, make your way over to the project page now. Also, if you have an idea you would like to see in this plugin or if you’ve found a bug, please let me know. Configuration WP_OTP_STEALTH: Set this to true to enable stealth OTP mode. Filters There are a multitude of filters to be adjusted. wp_otp_qr_code_provisioning_uri: URI for online QR Code rendering (must contain {PROVISIONING_URI} placeholder for QR Code data). wp_otp_login_form_text: Text for input field on the login screen. wp_otp_login_form_text_sub: Subtext for the input field on the login screen. wp_otp_login_form_invalid_code_text: Error text for an invalid code input on the login screen. wp_otp_code_expiration_window: Set the window of code verification expiration. wp_otp_recovery_codes_count: Number of recovery codes to generate. wp_otp_recovery_codes_length: Length of the recovery codes. wp_otp_secret_length: Length of the secret key. Minimum requirements WordPress 4.6, PHP 7.4. Donate / Support All donations are much appreciated, thank you 🙏 Get professional support for this plugin with a Tidelift subscription Tidelift helps make open source sustainable for maintainers while giving companies assurances about security, maintenance, and licensing for their dependencies. Security To report a security vulnerability, please use the Tidelift security contact. Tidelift will coordinate the fix and disclosure.