I Built 20+ Free Developer Tools as a Solo Dev - Here’s How (and Why)

Dafin Edison J — Sun, 16 Nov 2025 20:04:32 +0000

As developers, we all jump between multiple small tools daily—JSON formatter, CSS gradient generator, cron builder, QR generator, image compressor, boilerplate generator, and so on.

But the experience is always the same:

Too many ads
Too many popups
Slow pages
Login required
Or the site suddenly disappears

I got tired of it.

So I built Jaconir - a free, fast, no-login productivity hub with 20+ tools for developers, designers, and students.

👉 https://jaconir.online/tools

This post explains how I built it, what tools it includes, and why I created it.

🎯 Why I Built Jaconir

I’m a developer + designer + indie game creator.
Switching between tools slowed me down and broke my workflow.

I didn’t want:

ads
login walls
UI clutter
bloated apps

I just wanted simple tools that work instantly.

So I built them myself.

🛠️ Tools I Built (So Far)
Developer Tools

JSON Formatter
Sprite Sheet Generator
CSS Animation Builder
Cron Job Generator
Docker Command Helper
API Response Mocker
SVG Blob Generator
.env Validator
Git Branch Name Generator
Designer Tools
Business Card Generator
Color Palette Extractor
CSS Gradient Generator
Favicon Generator
Image Toolkit (compress, convert, remove background)
Productivity Tools
Newsletter HTML Generator
Keyword Research Tool
Schema Generator
UTM Builder

Full list:
👉 https://jaconir.online/tools

All tools are:

fast
simple
no login
no ads
minimal UI
browser-based

📘 Learning: DSA + System Design

I also built free learning hubs for students:

🚀 DSA Learning Hub
👉 https://jaconir.online/learn/dsa

🔥 System Design (Work in Progress)
👉 https://jaconir.online/learn/system-design

Each page has:

simple explanations
Visual Representation
examples
interview relevance
structured roadmap

🎨 Resources for Designers & Devs

Jaconir also includes:
free stock images
free videos
free icons
free UI components

👉 https://jaconir.online/resources

Everything is free to download and use.

⚙️ Tech Stack

HTML, CSS, JavaScript
Tailwind
Firebase Hosting
Canvas API
WebGL / Three.js (for 3D tools)
Custom SEO systems
No backend server
No frameworks (on purpose — fast loading)

🚀 What I’m Building Next

Here’s what I’m adding next:

Regex builder
API tester (mini Postman)
Code diff tool
Boilerplate code generator
JWT debugger
Webhook inspector
Interactive DSA visualizers
More system design modules

❤️ Why I’m Sharing This

The internet is filled with heavy tools, ads, and login walls.
I wanted to build something small, fast, and genuinely useful.

If you want to try the tools, here you go:

👉 https://jaconir.online/tools

If you have suggestions, I’d love to hear them 🙏

DEV Community: Dafin Edison J

I Built 20+ Free Developer Tools as a Solo Dev - Here’s How (and Why)