December flew by like a lightning bolt, and now there are only ten days left of the year. ๐ Personally, the biggest win this year was getting used to using AI as a sort of 'external brain.' At the same time, it was a period of constant awe watching how fast LLMs are evolving. I'm originally a non-dev 'Mundori' (liberal arts major) who used to envy developers who could manifest code out of thin air, never dreaming Iโd actually touch it myself. Then, around March this year, I heard that 'Gemini 2.5 Pro is great at coding' and 'it lets even non-devs build programs.' Thatโs how I started, by making a simple text converter.

โฒ An image EXIF remover I made in the early days. Even though it was a simple program, seeing real, working code pop out based on my instructions made me go nuts. ๐ Once I realized 'Wait, this actually works,' I figured since I can generate AI images too, I could combine the two to create something. Thatโs how my eventful 'Vibe Coding' journey began. ๐
1. Live On! Wakaba The first thing I decided to make was... a raising simulation game (!), quite fearless of me. ๐ I shared a post about it here once. I put a lot of thought and hard work into it, but it was a bit of a bummer that there was a barrier at the download stage since I tried to distribute it as a ZIP file for local use. Maybe I can revive it as a web app or mobile format someday.

2. Arcana Code v1.0 Next, I made a Tarot card web app using LLM. The concept was solid and prototyping was fast, but the BYOK (Bring Your Own Key) methodโrequiring user API keysโheld it back. Since it was a web deployment, I figured there'd be trust issues with users entering their API keys... so it ended up being an awkward local app. I'm currently rebuilding this as a Chrome extension. I want to add multi-language support and go global. I'm hoping to drop an MVP on the Web Store early next year. haha
โฒ Screen from Arcana Code 2.0 currently in development

3. Ether Tuner The third thing is a conceptual app combining brown noise + radionics in a static website format. ๐ Finished it on May 17th. I was obsessed with brown noise back then and wanted to listen to it without having to open a YouTube video. I made it so the visualizer and the brown noise change subtly based on keywords, but Gemini 2.5 struggled so hard with the visualizer. If I remade it with recent models, I think I could do it much better.

4. Prompt Viewer This is a Chrome extension that lets you easily see prompts for AI images (NAI, Stable Diffusion) via a right-click menu. According to the stats, it has a whopping 1,600 users... it's the most successful app I've made in terms of user base. Though it didn't make a dime since there's no monetization. ๐ The last update was June 4th, so I must have made it before early summer.
5. Archive 03 I've introduced this on Cliang before as well. It's a blog that serializes AI-generated finance content in Korean/English, with a concept where three anime-girl personas have some back-and-forth 'tiki-taka.'

For the content generation, I've automated HTML formatting and English localization for free using the Gemini CLI. However, since AI... sometimes does great research but then hallucinates and talks total nonsense, a final human review and polish is a must. Also, since I picked finance as the topic (a topic Google is very strict about), itโs not easy to show up in search results. lolol
6. Webplified I worked really hard on this one too. It's a tool that converts PNG/JPG files to WebP. The last update was July 5th. Itโs completely free with no ads, and looking back, Iโm not even sure why I spent so much time polishing it. ๐ Anyway, itโs live, and I still use it often when I want to shrink image sizes. haha

7. Haruna On Screen The big one: 'Haruna On Screen,' a screenmate for Windows. I shared this on Cliang too. I started making it around July/August and just pushed the 1.0.4 update yesterday. In yesterday's update, I added a 'school uniform' outfit and included the Gemini 3 Flash model in the options. Fixed some minor bugs too. I originally wanted to release it on Steam, but it got rejected due to external API usage issues, so I ended up putting it on itch.io (an indie software platform) for $2.99. Since I was able to implement almost exactly what I envisioned, it's one of the outputs I'm quite proud of. ๐ Yesterday, I even got feedback from a user saying they're using it to study Japanese/Chinese, which made me feel super accomplished.
8. Prognos 'Prognos,' a daily US stock chart predictor. A 'homemade' AI I trained at home with a single GPU. Yeah... writing this out, I realize I really made all sorts of stuff. This wasn't actually because I wanted to predict stock prices, but rather a learning project that started with the question: 'Can you really do machine learning at home with a 3060 GPU??' With Gemini's help, I applied architectures like LSTM and GRU and churned out over a dozen models that actually predict daily candles. Thanks to that, I think I've gained some understanding of machine learning. Of course, the brain size of the resulting models was at the level of a flatworm (like a leech or something)... lolol

9. Line by Line: A Timeline of My Thoughts This is another Chrome extension. It's a minimalist app where you record your daily life and thoughts line by line, and the AI reads them to give you feedback. Since it replaces the Chrome 'New Tab' page, the big advantage is that you can just jot things down mindlessly every time you open a tab. Out of all the apps I've made, 'Line by Line' is the one I use most frequently. The 'kick' (cool feature) is that it implements cross-device sync using Google Drive as a backend without needing a server. โ (Zero maintenance cost!) The feedback persona in the screenshot is a bit unique, but you can choose other 'normal' (?) characters too. ๐ The latest version 1.2.5 is currently up on the Chrome Web Store. It even has a feature that analyzes your strengths and weaknesses and gives advice based on long-term records. I also added Gemini 3 Flash to the options recently. haha

10. Wrapping up. Man, I didn't think this would get so long. To be honest, besides what I've written here, there are about six or seven other projects sleeping on my hard drive that I stopped midway through planning or implementation. ๐ ๐ (In the midst of all this, I even released an EP of AI music. lol) I have two or three ideas waiting to be built right now, and thanks to model improvements and tools like Anti-gravity, I expect to churn out various works even faster than before. Anyway, it feels like a year where I worked really hard creating things despite having a day job. Thinking about what's become possible thanks to AI over the past year... all I can say is that it's surprisingly amazing. Next year, I hope to create something that actually generates meaningful revenue through vibe coding. I'll end this here, wishing everyone a great end of the year and a healthy, happy New Year. ๐ Thank you!
6. ์นํ๋ฆฌํ์ด๋

์ด๊ฒ๋ ๊ต์ฅํ ์ด์ฌํ ๋ง๋ค์๋ ๊ฑฐ๋ค์. PNG/JPG ํ์ผ์ WebP ํ์ผ๋ก ๋ณํํด์ฃผ๋ ๋๊ตฌ์ ๋๋ค. ๋ง์ง๋ง ์ ๋ฐ์ดํธ ๋ ์ง๋ 7์ 5์ผ์ ๋๋ค. ์์ ๋ฌด๋ฃ์ ๊ด๊ณ ๋ ์๋๋ฐ ์ ๊ทธ๋ ๊ฒ ์ด์ฌํ ๊น์๋์ง ์ง๊ธ ์๊ฐํด ๋ณด๋ฉด ๋ค์ ์๋ฌธ์ด๊ตฐ์. ๐ ์๋ฌดํผ ๊ณต๊ฐ๋ ๋์ด ์๊ณ , ์ ๋ ์ด๋ฏธ์ง ์ฉ๋ ์ค์ด๊ณ ์ถ์ ๋ ์ข ์ข ์ ์ฉํ๋ ๋ฌผ๊ฑด์ด๋ค์. ใ ใ
7. ํ๋ฃจ๋ ์จ ์คํฌ๋ฆฐ



๋๋ง์ ๊ทธ ๋ฌผ๊ฑด, ์๋์ฉ ์คํฌ๋ฆฐ๋ฉ์ดํธ 'ํ๋ฃจ๋ ์จ ์คํฌ๋ฆฐ'. ์ญ์ ํด๋ฆฌ์ ์๊ฐ๊ธ๋ก ํ๋ฒ ๊ณต์ ๋ฅผ ํ์์ต๋๋ค. ๋๋ต 7~8์๊ฒฝ์ ๋ง๋ค๊ธฐ ์์ํ๊ณ , ๋ฐ๋ก ์ด์ 1.0.4 ์ ๋ฐ์ดํธ๋ฅผ ์งํํ์ง์. ์ด์ ์ ๋์์ '๊ต๋ณต' ์์์ ์ถ๊ฐํ๊ณ ์ ๋ฏธ๋ 3 ํ๋์ ๋ชจ๋ธ์ ๋ชจ๋ธ ์ ํ์ง์ ๋ฃ์์ต๋๋ค. ์์ํ ๋ฒ๊ทธ๋ ์ก์๊ณ ์. ๋ณธ๋ ์คํ์ ์ถ์ํ๋ ค ํ์ง๋ง ์ธ๋ถ API ์ฌ์ฉ ์ด์๋ก ๋ฆฌ์ ๋์๊ณ , ๊ฒฐ๊ตญ itch.io๋ผ๋ ์ธ๋ ์ํํธ์จ์ด ํ๋ซํผ์ 2.99๋ฌ๋ฌ๋ก ์ฌ๋ ธ์ต๋๋ค. ์ ๊ฐ ์๊ฐํ ๊ฒ์ ๊ฑฐ์ ๊ทธ๋๋ก ๊ตฌํํ ์ ์์๊ธฐ ๋๋ฌธ์, ๋๋ฆ ์๋ถ์ฌ์ ๊ฐ์ง๊ณ ์๋ ์ฐ์ถ๋ฌผ ์ค ํ๋์ ๋๋ค. ๐ ์ด์ ๋ ์ผ๋ณธ์ด/์ค๊ตญ์ด ํ์ต์ฉ์ผ๋ก ์ฌ์ฉํ๊ณ ๊ณ์๋ค๋ ์ฌ์ฉ์๋ถ์ ํผ๋๋ฐฑ๋ ๋ค์ ์ ์์ด์ ๋ฌด์ฒ ๋ฟ๋ฏํ๋ค์.
8. ํ๋ก๊ทธ๋ ธ์ค

๋ฏธ๊ตญ ์ฃผ์ ์ผ๋ด ์ฐจํธ ์์ธก๊ธฐ 'ํ๋ก๊ทธ๋ ธ์ค'. ์ง์์ ๊ธ์นด ํ ์ฅ์ผ๋ก ํ๋ จ์ํจ ์์ (?) ํ๋ฉ์ด๋(?) AI์ ๋๋ค. ๋ค... ์ฐ๋ค ๋ณด๋๊น ์ ๊ฐ ์ง์ง ๋ณ ๊ฑธ ๋ค ๋ง๋ค์๋ค์. ์ด๊ฑด ์ฌ์ค ์ง์ง ์ฃผ๊ฐ๋ฅผ ์์ธกํ๊ณ ์ถ์๋ค๊ธฐ๋ณด๋ค๋ 3060 GPU๋ก ์ง์ง ์ง์์ ๋จธ์ ๋ฌ๋์ด ๊ฐ๋ฅํด??? ๋ผ๋ ์๋ฌธ์ผ๋ก ์์ํ๋ ํ์ต์ฉ ํ์ ์ด์์๋๋ค. ์ ๋ฏธ๋์ ๋์์ผ๋ก LSTM, GRU ๋ฑ ์ํคํ ์ฒ๋ฅผ ์ ์ฉํด ์ค์ ๋ก ์ผ๋ด์ ์์ธกํ๋ ๋ชจ๋ธ์ ์ญ์ ๊ฐ์ง๋ ๋ฝ์ ๋ดค๋ค์. ๋๋ถ์ ๊ธฐ๊ณํ์ต์ ๋ํ ์ดํด๋ ์ด๋ ์ ๋ ์๊ฒผ๋ ๊ฒ ๊ฐ์ต๋๋ค. ๋ฌผ๋ก ๋ง๋ค์ด์ง ๋ชจ๋ธ์ ๋ ํฌ๊ธฐ๋ ๊ธฐ๊ปํด์ผ ํธํ๋๋ฌผ(๊ฑฐ๋จธ๋ฆฌ ๊ฐ์ ๊ฑฐ) ์์ค์ด๊ธด ํ์ง๋ง์... ใ ใ ใ ใ
9. ํ์คํ์ค: ๋ด ์๊ฐ์ ํ์๋ผ์ธ

์ด๊ฑด ๋ ๋ค๋ฅธ ํฌ๋กฌ ์ต์คํ ์ ์ผ๋ก, ํ์์ ํ ์ค์ฉ ๋ด ์ผ์๊ณผ ์๊ฐ์ ๊ธฐ๋กํด ๋๋ฉด AI๊ฐ ๊ทธ๊ฑธ ์ฝ๊ณ ํผ๋๋ฐฑ์ ์ฃผ๋ ๋ฏธ๋๋ฉํ ์ฑ์ ๋๋ค. ํฌ๋กฌ ์ ํญ์ ๋์ฒดํ๊ธฐ ๋๋ฌธ์, ์ํญ ์ด ๋๋ง๋ค ์๋ฌด ์๊ฐ ์์ด ๊ทธ๋๊ทธ๋ ๋ง๊ตฌ ๊ธฐ๋ก์ ์จ์ ๋ ์ ์๋ค๋ ํฐ ์ฅ์ ์ด ์์ต๋๋ค. ์ค์ ๋ก ์ ๊ฐ ๋ง๋ ์ฑ ์ค์ ์ง์ ์ฌ์ฉํ๋ ๋น๋๊ฐ ๊ฐ์ฅ ๋์ ๊ฒ์ด ๋ฐ๋ก ์ด 'ํ์คํ์ค'์ธ๋ฐ์. ์๋ฒ ์์ด, ๊ตฌ๊ธ ๋๋ผ์ด๋ธ๋ฅผ ๋ฐฑ์๋์ฒ๋ผ ์ฌ์ฉํด์ ๊ธฐ๊ธฐ ๊ฐ ๊ธฐ๋ก ๋๊ธฐํ๋ฅผ ๊ตฌํํ ๋ถ๋ถ์ด ํฅ์ ๋๋ค. โ (์ ์ง๋น 0์!) ์บก์ฒ์งค์ ํผ๋๋ฐฑ ํ๋ฅด์๋๊ฐ ์ข ๋ ํนํ๋ฐ์. ์ค ๋ง๊ณ ์ข ๋ค๋ฅธ ์ ์์ ์ธ(?) ์บ๋ฆญํฐ๋ ์ ํ ๊ฐ๋ฅํฉ๋๋ค. ๐ ํ์ฌ๋ ํฌ๋กฌ ์น์คํ ์ด์ 1.2.5 ์ต์ ๋ฒ์ ์ด ์ฌ๋ผ๊ฐ ์์ต๋๋ค. ๊ธด ๊ธฐ๊ฐ์ ๊ธฐ๋ก์ ๋ฐํ์ผ๋ก ์๋์ ๊ฐ์ด ์ฌ์ฉ์์ ์ฅ๋จ์ ์ ๋ถ์ํ๊ณ ์กฐ์ธํด ์ฃผ๋ ๊ธฐ๋ฅ๋ ๋ค์ด๊ฐ ์์ง์. ์ต๊ทผ ์ ๋ฏธ๋ 3 ํ๋์ ๋ชจ๋ธ๋ ์ ํ์ง์ ๋ฃ์ด๋์ต๋๋ค. ใ ใ

10. ๋ง๋ฌด๋ฆฌ. ์๋, ์ด๋ ๊ฒ ๊ธธ์ด์ง ์ค์ ์๊ฐ ๋ชปํ๋ค์. ์ฌ์ค ์ง๊ธ ์ด ๊ฑฐ ๋ง๊ณ ๋ ๊ธฐํ์ด๋ ๊ตฌํ ์ค๊ฐ์ ๋ฉ์ถ ํ์ ๋ค์ด ์ ํ๋์ ์๋๊ณฑ ๊ฐ์ง๋ ์ ๋ค์ด ์์ต๋๋ค. ๐ ๐ (๊ทธ ์์ค์ AI ์์ ์ผ๋ก EP ์์์ ์ถ์ํ๊ธฐ๋ ํ์ฃ . ใ ใ ใ ) ์ง๊ธ๋ ๋์ธ ๊ฐ์ง ์์ด๋์ด๋ค์ด ๊ตฌํ์ ๊ธฐ๋ค๋ฆฌ๊ณ ์๋๋ฐ, ๋ชจ๋ธ ๋ฐ์ ๊ณผ ์ํฐ๊ทธ๋๋นํฐ ๋๋ถ์ ์ ๋ณด๋ค ํจ์ฌ ๋น ๋ฅด๊ฒ ๋ค์ํ ์์ ๋ฌผ์ ๋ง๋ค ์ ์์ ๊ฒ์ผ๋ก ๊ธฐ๋๋ฉ๋๋ค. ์๋ฌดํผ ๋ฐ๋ก ๋ณธ์ ์ด ์๋ ์ํ์์์๋ ์ ๋ง ์ด์ฌํ ์ด๊ฒ์ ๊ฒ ๋ง๋ค์ด๋ ํ ํด์๋ ๊ฒ ๊ฐ์ต๋๋ค. ์ง๋ 1๋ ๊ฐ AI ๋๋ถ์ ๋ญ๊ฐ ๊ฐ๋ฅํด์ก๋์ง ์๊ฐํด ๋ณด๋ฉด... ์์ผ์ค๋ฝ์ง๋ง ๋๋๋ค๊ณ ๋ฐ์ ํ ๋ง์ด ์๋ค์. ๋ด๋ ์๋ ๋ฐ์ด๋ธ ์ฝ๋ฉ์ผ๋ก ์๋ฏธ ์๋ ์์ต์ ๋ด๋ ๋ฌด์ธ๊ฐ๋ ๊ผญ ๋ง๋ค์ด ๋ณด๊ณ ์ถ๋ค๋ ๋ฐ๋์ ๋๋ค. ๊ทธ๋ผ ์ฌ๊ธฐ๊น์ง ์ฝ์ด์ฃผ์ ์ฌ๋ฌ๋ถ๊ป์๋ ํ ํด ์ ๋ง๋ฌด๋ฆฌํ์๊ณ , ๊ฑด๊ฐํ๊ณ ํ๋ณตํ๊ฒ ์ํด ๋ง์ดํ์๊ธธ ๋ฐ๋ผ๋ฉฐ ๋ง์นฉ๋๋ค. ๐ ๊ฐ์ฌํฉ๋๋ค!
"The community is in awe of this 'Mundori' powerhouse who's out-coding the pros, while an IT veteran gives a nod of respect to the new era of AI-powered creativity."
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