The latest articles on DEV Community by Abhishek Kumar (@lihenium). https://dev.to/lihenium https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3847635%2F93245643-8536-4c81-94fa-a1f6e0182a39.png https://dev.to/lihenium en Abhishek Kumar Tue, 31 Mar 2026 14:59:08 +0000 https://dev.to/lihenium/just-launched-lihenium-on-product-hunt-today-built-solo-from-india-with-no-team-no-17ge https://dev.to/lihenium/just-launched-lihenium-on-product-hunt-today-built-solo-from-india-with-no-team-no-17ge <div class="ltag__link--embedded"> <div class="crayons-story "> <a href="https://dev.to/lihenium/i-built-an-all-in-one-pdf-scanner-vault-app-solo-in-kotlin-lihenium-is-now-live-on-play-store-3bcg" class="crayons-story__hidden-navigation-link">I built an all-in-one PDF Scanner &amp; Vault app solo in Kotlin — Lihenium is now live on Play Store!</a> <div class="crayons-story__body crayons-story__body-full_post"> <div class="crayons-story__top"> <div class="crayons-story__meta"> <div class="crayons-story__author-pic"> <a href="/lihenium" class="crayons-avatar crayons-avatar--l "> <img src="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3847635%2F93245643-8536-4c81-94fa-a1f6e0182a39.png" alt="lihenium profile" class="crayons-avatar__image" width="96" height="96"> </a> </div> <div> <div> <a href="/lihenium" class="crayons-story__secondary fw-medium m:hidden"> Abhishek Kumar </a> <div class="profile-preview-card relative mb-4 s:mb-0 fw-medium hidden m:inline-block"> Abhishek Kumar <div id="story-author-preview-content-3420760" class="profile-preview-card__content crayons-dropdown branded-7 p-4 pt-0"> <div class="gap-4 grid"> <div class="-mt-4"> <a href="/lihenium" class="flex"> <span class="crayons-avatar crayons-avatar--xl mr-2 shrink-0"> <img src="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3847635%2F93245643-8536-4c81-94fa-a1f6e0182a39.png" class="crayons-avatar__image" alt="" width="96" height="96"> </span> <span class="crayons-link crayons-subtitle-2 mt-5">Abhishek Kumar</span> </a> </div> <div class="print-hidden"> Follow </div> <div class="author-preview-metadata-container"></div> </div> </div> </div> </div> <a href="https://dev.to/lihenium/i-built-an-all-in-one-pdf-scanner-vault-app-solo-in-kotlin-lihenium-is-now-live-on-play-store-3bcg" class="crayons-story__tertiary fs-xs"><time>Mar 28</time><span class="time-ago-indicator-initial-placeholder"></span></a> </div> </div> </div> <div class="crayons-story__indention"> <h2 class="crayons-story__title crayons-story__title-full_post"> <a href="https://dev.to/lihenium/i-built-an-all-in-one-pdf-scanner-vault-app-solo-in-kotlin-lihenium-is-now-live-on-play-store-3bcg" id="article-link-3420760"> I built an all-in-one PDF Scanner &amp; Vault app solo in Kotlin — Lihenium is now live on Play Store! </a> </h2> <div class="crayons-story__tags"> <a class="crayons-tag crayons-tag--monochrome " href="/t/androiddev"><span class="crayons-tag__prefix">#</span>androiddev</a> <a class="crayons-tag crayons-tag--monochrome " href="/t/kotlin"><span class="crayons-tag__prefix">#</span>kotlin</a> <a class="crayons-tag crayons-tag--monochrome " href="/t/productivity"><span class="crayons-tag__prefix">#</span>productivity</a> <a class="crayons-tag crayons-tag--monochrome " href="/t/privacy"><span class="crayons-tag__prefix">#</span>privacy</a> </div> <div class="crayons-story__bottom"> <div class="crayons-story__details"> <a href="https://dev.to/lihenium/i-built-an-all-in-one-pdf-scanner-vault-app-solo-in-kotlin-lihenium-is-now-live-on-play-store-3bcg" class="crayons-btn crayons-btn--s crayons-btn--ghost crayons-btn--icon-left"> <div class="multiple_reactions_aggregate"> <span class="multiple_reactions_icons_container"> <span class="crayons_icon_container"> <img src="https://assets.dev.to/assets/sparkle-heart-5f9bee3767e18deb1bb725290cb151c25234768a0e9a2bd39370c382d02920cf.svg" width="24" height="24"> </span> </span> <span class="aggregate_reactions_counter">2<span class="hidden s:inline"> reactions</span></span> </div> </a> <a href="https://dev.to/lihenium/i-built-an-all-in-one-pdf-scanner-vault-app-solo-in-kotlin-lihenium-is-now-live-on-play-store-3bcg#comments" class="crayons-btn crayons-btn--s crayons-btn--ghost crayons-btn--icon-left flex items-center"> Comments <span class="hidden s:inline">Add Comment</span> </a> </div> <div class="crayons-story__save"> <small class="crayons-story__tertiary fs-xs mr-2"> 1 min read </small> <span class="bm-initial"> </span> <span class="bm-success"> </span> </div> </div> </div> </div> </div> </div> androiddev kotlin productivity privacy Abhishek Kumar Sat, 28 Mar 2026 13:26:05 +0000 https://dev.to/lihenium/i-built-an-all-in-one-pdf-scanner-vault-app-solo-in-kotlin-lihenium-is-now-live-on-play-store-3bcg https://dev.to/lihenium/i-built-an-all-in-one-pdf-scanner-vault-app-solo-in-kotlin-lihenium-is-now-live-on-play-store-3bcg <p>Hey DEV community! <br> I'm Abhishek, a solo Android developer from Bihar, India. After months of late-night coding, I launched my app <strong>Lihenium: Scan PDF &amp; Vault</strong> on Google Play Store!</p> <h2> 🤔 Why I Built It </h2> <p>I was frustrated using 5 different apps just to scan, edit, manage, compress and lock my documents. So I built one app that does everything — offline-first, private by default.</p> <h2> 🛠️ Tech Stack </h2> <ul> <li> <strong>Kotlin</strong> + Jetpack Compose</li> <li> <strong>OpenCV</strong> for smart document corner detection</li> <li> <strong>Room Database</strong> for local storage</li> <li> <strong>CameraX</strong> for scanning</li> <li> <strong>ML Kit</strong> for OCR</li> </ul> <h2> 📱 Core Features </h2> <p><a href="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fd8ew8c8ycbb17z89xf76.png" class="article-body-image-wrapper"><img src="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fd8ew8c8ycbb17z89xf76.png" alt="App Main Dashboard" width="800" height="1422"></a></p> <ul> <li>✂️ PDF Tools: Merge, split, sign, OCR &amp; watermark</li> <li>📷 QR Scanner &amp; Generator</li> <li>📄 Smart Document Scanner with auto-crop</li> </ul> <p><a href="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F0uzz2ninkmxtdwnibvcu.png" class="article-body-image-wrapper"><img src="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F0uzz2ninkmxtdwnibvcu.png" alt="Scanner Screen" width="800" height="1422"></a></p> <ul> <li>🔒 Secure Vault with biometric lock</li> </ul> <p><a href="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fg43rx54fxr0moqhlqg7y.png" class="article-body-image-wrapper"><img src="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fg43rx54fxr0moqhlqg7y.png" alt="Secure Vault" width="800" height="1422"></a></p> <ul> <li>📁 Doc Library with folders &amp; tags</li> </ul> <p><a href="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F0uu95wz0uwzzlelkx2ds.png" class="article-body-image-wrapper"><img src="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F0uu95wz0uwzzlelkx2ds.png" alt="Doc Library" width="800" height="1422"></a></p> <ul> <li>🖼️ Passport photo maker &amp; background remover</li> </ul> <p><a href="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fogduk0db5khaj2pjv7u2.png" class="article-body-image-wrapper"><img src="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fogduk0db5khaj2pjv7u2.png" alt="Passport Photo Maker" width="800" height="1422"></a></p> <ul> <li>☁️ Optional Google Drive backup</li> </ul> <p><a href="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fpa06v4atz3wqvhjh69o2.png" class="article-body-image-wrapper"><img src="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fpa06v4atz3wqvhjh69o2.png" alt="Google Drive Backup" width="800" height="1422"></a></p> <h2> 💪 Biggest Challenges as Solo Dev </h2> <ol> <li>Integrating OpenCV efficiently without bloating the APK</li> <li>Handling 10,000+ images without OOM crashes</li> <li>Keeping the final APK at just 18MB with all features packed in</li> </ol> <h2> 🚀 Try It! </h2> <p>👉 <strong>Play Store:</strong> <a href="https://play.google.com/store/apps/details?id=com.abhi.docu" rel="noopener noreferrer">https://play.google.com/store/apps/details?id=com.abhi.docu</a></p> <p>Would love your honest feedback! 🙏</p> androiddev kotlin productivity privacy