# Symelo - Where curiosity becomes code URL: https://symelo.com/ Web development, AI tooling, and psychology research systems. ## What we do ### Client work Websites, web apps and APIs built to order in Next.js, React and PHP. ### Our projects Web products we design, build and run ourselves. ### Research Applied work on AI, psychology and how people make decisions in software. ### Tools & Resources Ten free tools for everyday image, development, email and monitoring tasks, plus free WordPress plugins and themes. ## Selected work ### Obuvna Zona An online store for women's shoes, with browsing by category and search by size and colour. ### Pettex An online store for tools, machines and equipment for the home, garden and business, with daily deals, best sellers and browsing by category. ## Free tools ### JSON Viewer Validate, format, search, and inspect JSON trees in the browser. ### Text & Code Diff Checker Compare text or code with whitespace controls and diff export. ### HTML Cleaner Clean HTML in the browser by removing unwanted tags, attributes, styles, and comments. ### QR Code Generator Create branded QR codes with custom colors, center images, and PNG or SVG export. ### Placeholder Image Generator Generate custom placeholder images with seeded backgrounds and SVG, PNG, or JPG output. ### Symelo Images Edit images with layers, clipboard paste, and export. Files stay on your device. ### Password & Random Generator Generate passwords, passphrases, names, and custom patterns with adjustable character rules and batch export. ### Domain Registration Checker Check one domain or a list for registration records and metadata. ### SMTP Test Tool Test an SMTP server's connection, TLS and login, and send a test email while reading the full SMTP conversation. ### UpHeron - Uptime Monitor Monitor uptime, endpoints, SSL certificates, and heartbeats from several regions, check your sites for vulnerabilities, and get notified, with incident alerts and public status pages. ## Research ### Interface decision load How visual density, timing, and information order affect user decisions. ### Human-in-loop tooling Systems that keep experts in control while automating repetitive analysis. ### Behavioral telemetry Clean event design for reliable product and research datasets. ## Tool links - [JSON Viewer](https://symelo.com/tools/json-viewer): Validate, format, search, and inspect JSON trees in the browser. - [Text & Code Diff Checker](https://symelo.com/tools/diff-checker): Compare text or code with whitespace controls and diff export. - [HTML Cleaner](https://symelo.com/tools/html-cleaner): Clean HTML in the browser by removing unwanted tags, attributes, styles, and comments. - [QR Code Generator](https://symelo.com/tools/qr-code): Create branded QR codes with custom colors, center images, and PNG or SVG export. - [Placeholder Image Generator](https://symelo.com/tools/placeholder-images): Generate custom placeholder images with seeded backgrounds and SVG, PNG, or JPG output. - [Symelo Images](https://images.symelo.com/): Edit images with layers, clipboard paste, and export. Files stay on your device. - [Password & Random Generator](https://symelo.com/tools/password-generator): Generate passwords, passphrases, names, and custom patterns with adjustable character rules and batch export. - [Domain Registration Checker](https://symelo.com/tools/domain-checker): Check one domain or a list for registration records and metadata. - [SMTP Test Tool](https://symelo.com/tools/smtp-test): Test an SMTP server's connection, TLS and login, and send a test email while reading the full SMTP conversation. - [UpHeron - Uptime Monitor](https://upheron.com/): Monitor uptime, endpoints, SSL certificates, and heartbeats from several regions, check your sites for vulnerabilities, and get notified, with incident alerts and public status pages. ## WordPress plugins - [Symelo SMTP](https://symelo.com/tools/wordpress-plugins/symelo-smtp): Reliable email delivery for WordPress: SMTP and provider APIs, email logs, failure alerts and a backup connection. - [Symelo Image Optimizations](https://symelo.com/tools/wordpress-plugins/symelo-image-optimizations): Faster images: compression, WebP and AVIF, resizing, metadata removal, responsive and lazy-loaded images. Every change can be undone. - [Symelo Backups and Migration](https://symelo.com/tools/wordpress-plugins/symelo-backups-and-migration): Back up files and database to the cloud, restore in one click even when the site is broken, and migrate to a new domain or server. - [Symelo Image Optimizations Pro](https://symelo.com/tools/wordpress-plugins/symelo-image-optimizations-pro): Command-line encoders for Symelo Image Optimizations: cwebp, avifenc, jpegoptim, oxipng, pngquant and qpdf, installed or as pinned builds. - [Symelo Bulgarian Shipping for WooCommerce](https://symelo.com/tools/wordpress-plugins/symelo-bulgarian-shipping-for-woocommerce): Speedy, Econt, Pigeon Express and BOX NOW for WooCommerce: office, locker and door delivery with live prices, waybills, tracking and the НАП file. ## WordPress themes [All WordPress themes](https://symelo.com/tools/wordpress-themes): 107 free block themes. ## Project links - [Obuvna Zona](https://obuvnazona.bg/): An online store for women's shoes, with browsing by category and search by size and colour. - [Pettex](https://pettex.bg/): An online store for tools, machines and equipment for the home, garden and business, with daily deals, best sellers and browsing by category. - [UpHeron](https://upheron.com/): Uptime, SSL, domain and DNS monitoring from six regions, with vulnerability alerts for the software behind your websites and code. - [Woofians](https://woofians.com/): A live map of vets, groomers, walkers, parks, hotels and shops for dog owners in Bulgaria, with sourced details. - [Garbamons](https://garbamons.com/): A community map for cleanup reports, sights, events, and travel notes. - [Dumite](https://dumite-bg.com/): A Bulgarian dictionary with spelling guidance, common mistakes, and real usage examples. - [Symelo Images](https://images.symelo.com/): Edit images with layers, clipboard paste, and export. Files stay on your device. ## Related pages - [All tools](https://symelo.com/tools) - [Agent documentation](https://symelo.com/llms.txt)