GDG Coding Jams
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What the rooms shipped.

Real builds from real GDG chapters. Two hours, one pizza, one prototype. Filter by track or chapter — or scroll until something makes you want to fork it.

All builds

Showing 37–48 of 70

Previs
Track 06GDG Brooklyn
Previs

Magic Hour turns a screenplay into a consistent storyboard: your characters keep the same face and voice from scene 1 to scene 18, because every generated frame is scored against a locked identity card. A pre‑viz studio for filmmakers, with AI shot lists, in‑character dialogue, and real location scouting.

I assumed character drift was the image model being inconsistent but the model was fine all along; the drift came entirely from us re‑describing the character on every call instead of compiling her look once and reusing it verbatim.

NYC Point-to-Point
Track 09GDG Brooklyn
NYC Point-to-Point

The NYC Point-to-Point Travel Recommender is a smart, interactive routing engine designed for New Yorkers and tourists who need help navigating the city's complex transit web. Instead of just showing the fastest route, it calculates and ranks all available options—from the subway to rideshares to Citi Bikes—based on your live priorities like cost, safety, and group size. The coolest part is the dynamic scoring engine: as you drag the priority sliders or increase your group size, the app instantl

I was surprised by how dramatically the math shifts when factoring in group size; a seemingly expensive $40 rideshare instantly becomes the most cost-effective and convenient option when split among four people, entirely upending the standard "the subway is always cheapest" assumption.

Inclusivity AI
Track 09GDG Brooklyn
Inclusivity AI

Inclusivity AI is your friendly helper for everyday life. We make scheduling, shopping, and budgeting simple and accessible, with gentle reminders along the way! Made simple for people with disabilities, memory challenges, or anyone who just needs a little extra support.

Google Studios is fun to use and you can customize certain parts of your app in minutes! Also special shoutout to Milan for helping me understand how to upload it to Github!

SensePath
Track 09GDG Brooklyn
SensePath

SensePath is a voice-first accessibility assistant designed for blind and low-vision users. It combines Gemini Live, multimodal vision, and Google Maps Platform to help people navigate the last few meters of a journey finding entrances, benches, elevators, and understanding their surroundings through natural conversation. The standout feature is its ability to seamlessly switch between navigation, object finding, and immersive scene descriptions while keeping the interaction hands-free and acces

We expected navigation to be the hardest problem, but the real challenge was making AI know when not to speak. Designing an assistant that gives timely, concise guidance without overwhelming or distracting the user turned out to be just as important as the underlying AI itself.

Rainy Day Rhythm
Track 09GDG Brooklyn
Rainy Day Rhythm

Generate a beat map to compliment any song you want to turn into a rhythm game. Connected through Youtube, you can either insert a link or describe the video you are looking for. There are additional features to make it more entertaining.

I was surprised the AI filled in so may gaps in what i didn't tell it to do. For example, I intended for it to be played through both keyboard and touch screen, but I didn't specify how to do a flick note using key binds. The AI filled it in my equating double-tap as a flick note.

Song Battle
Track 09GDG Brooklyn
Song Battle

Song Battle PK turns any artist, era, or musical mood into a fast head-to-head song tournament. Players watch YouTube performances, choose winners, and crown a champion—or generate an original song and synchronized AI music video from their own creative prompt.

the sound genertaing was way better than I thought

NYCity SOS
Track 09GDG Brooklyn
NYCity SOS

City SOS is a voice-first safety companion that helps people ask for assistance even when they can't speak openly. It starts as a normal NYC and campus resource assistant, then seamlessly switches into a natural cover conversation (like ordering pizza) while quietly gathering context. When the user confirms with a predefined trigger phrase, it discreetly alerts their pre-selected trusted contacts without interrupting the ongoing conversation.

The biggest surprise was how convincing the cover conversation felt. With Gemini Live and careful prompting, the assistant stayed completely in character while still collecting the context needed for a discreet alert.

GIGGLE HERTZ
Track 09GDG Brooklyn
GIGGLE HERTZ

Scan the QR code on your phone, warm up your laughter, and prepare for 10 seconds of pure crowd chaos!

I could build a complex multimodal fun game, easily and while bring communities together for laughter.

Handkerchief Duel
Track 09GDG Brooklyn
Handkerchief Duel

Developed a web-based strategic handkerchief game built on a 10-node number line and finite-state machine, implementing real-time two-player gameplay with Socket.io and AI opponents. The game features asymmetric roles—a Dropper strategically decides whether and where to drop the handkerchief, while a Guesser chooses whether to open their eyes to infer the drop, with damage determined by the handkerchief's placement and each player's decisions.

I was surprised by how capable AI Studio is—it generated most of the application with very little code from me. The only thing I missed was the ability to force or replay specific scenarios, which would make manual testing much easier.

Class Scheduler
Track 09GDG Brooklyn
Class Scheduler

My project can create a course schedule for students based on a course list it can draw from as well as an option for required and optional courses. It takes into account professor rating, how close together are the classes, and preferred days off giving multiple schedules with a score for each based on how the user weighted each factor.

What surprised me was how AI seemed to think ahead as it added features that alongside the ones, I suggested to make my suggestions work better.

ink2pix
Track 09GDG Brooklyn
ink2pix

Ink2Pix is an interactive creative canvas that transforms hand-drawn sketches into hyper-realistic 2K images and animated video clips in real time. Designed for visual storytellers, artists, and designers, it turns rough doodles into high-fidelity artwork using customizable style presets. The cool part? With a single click, Gemini Omni Flash animates your static artwork into dynamic 3D video scenes complete with synchronized ambient audio.

Gemini could handle some edge cases we didn't expect. We didn't expect such a great output for the prompt we gave.

contest_It
Track 09GDG Brooklyn
contest_It

Contest It is a civic AI tool that tells NYC residents whether they should fight or pay a city summons in seconds. Upload a photo of your ticket (or type the violation code), and Gemini Vision OCR extracts the charge, cross-references it against 421,000+ real OATH hearing outcomes, and shows your actual dismissal probability with a ready-to-submit defense brief. It's built for the everyday New Yorker who gets a $300 sidewalk ticket and has no idea that historically, 45% of those get thrown out

The biggest surprise was the data itself we found that for some of the most common NYC violations (noise, sidewalk snow, building maintenance), dismissal rates are shockingly high, yet almost nobody contests them because the process feels intimidating. The gap between "you'd probably win" and "people just pay" turned out to be the entire reason this project matters. On the technical side, we did