The latest articles on DEV Community by Kavinkumar R (@kavinkumarr). https://dev.to/kavinkumarr https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F4145251%2Fabc3fbb9-fea6-4124-a23b-75fe64549751.png https://dev.to/kavinkumarr en Kavinkumar R Sun, 27 Sep 2026 08:36:55 +0000 https://dev.to/kavinkumarr/i-found-the-clash-of-clans-api-and-ended-up-building-a-war-simulator-58n9 https://dev.to/kavinkumarr/i-found-the-clash-of-clans-api-and-ended-up-building-a-war-simulator-58n9 <p>I was looking for something to build and came across the Clash of Clans developer API.</p> <p>I didn't have a particular problem I wanted to solve. I just started looking through the API and wondering what I could build with the data it exposes.</p> <p>That eventually turned into WarOracle.</p> <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.us-east-2.amazonaws.com%2Fuploads%2Farticles%2Fv52nkjobhw2ilzuxbawf.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.us-east-2.amazonaws.com%2Fuploads%2Farticles%2Fv52nkjobhw2ilzuxbawf.png" alt="Enter player / clan tag to get the current war line up" width="800" height="600"></a></p> <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.us-east-2.amazonaws.com%2Fuploads%2Farticles%2F7iyb5yretl3e89qps70t.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.us-east-2.amazonaws.com%2Fuploads%2Farticles%2F7iyb5yretl3e89qps70t.png" alt="Predicted outcome with the simulated war" width="800" height="600"></a></p> <p>The basic idea is to simulate a Clash of Clans war and see how it could play out.</p> <p>For a clan, I look at the current war, players, Town Hall levels, heroes/equipment and previous attack history. From that, I build an estimate of how individual attacks might perform.</p> <p>Then I run the remaining war through Monte Carlo simulations and aggregate the results.</p> <p>It gives things like:</p> <ul> <li>win/loss/draw probability</li> <li>expected final stars</li> <li>possible final score range</li> <li>distribution of simulated outcomes</li> </ul> <p>One part that took more thought than I expected was ongoing wars.</p> <p>If a war is already halfway through, I can't just simulate the whole thing from scratch. The attacks that already happened are known outcomes, so I treat them as fixed and only simulate the attacks that are still available.</p> <p>I also experimented with using the same data to generate attacker/target assignments. I'm not completely convinced that part is useful yet.</p> <p>The backend is Spring Boot/Java and the frontend is React. The simulation engine is multithreaded, and I'm currently experimenting with how much player-specific history should influence the outcome versus using general historical data.</p> <p>The project is here:</p> <p><a href="https://waroracle.me" rel="noopener noreferrer">https://waroracle.me</a></p> <p>I'm mainly putting this out because I'm curious about two things:</p> <ol> <li><p>Does this actually seem useful to a Clash player?</p></li> <li><p>If you've built simulation/probabilistic systems before, how would you approach modeling something like this when the available data is limited and pretty noisy?</p></li> </ol> <p>I'm still figuring out whether I built something people actually need or just an interesting experiment with an API.</p> showdev java react