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loefflerlabs.com
@loefflerlabs.com
160 followers 500 following 22 posts
Maker and engineer. I am passionate about privacy, open source, and the climate.
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loefflerlabs.com
Just submitted ForecastSkill to the 2025 OpenWeather Challenge, a Claude Skill that scores weather conditions for activities like skiing, hiking, and picnics as well as gets up-to-date weather forecasts from OpenWeather's API right in your Claude chats.

Code: github.com/kevinl95/ForecastSkill
A Claude chat window with the text: "Use the forecast-skill to tell me when the best time to go skiing at Loveland is I'll read the forecast skill first to understand how to use it properly. Now I'll use the activity recommendation feature to check skiing conditions at Loveland: bash python /mnt/skills/user/forecast-skill/skills/get_weather.py activity skiing "Loveland, Colorado" Based on the 5-day forecast, Thursday, November 20th is the best day for skiing at Loveland with the highest score of 79.5/100. Here's the breakdown: Thursday, Nov 20 - Best day (score: 80) - Coldest at 8.8°C with overcast clouds Tuesday, Nov 18 - Second best (score: 77) - 13.8°C with broken clouds Monday, Nov 17 - Good (score: 75) - 14.3°C with broken clouds Wednesday, Nov 19 - Good (score: 74) - 14.8°C with overcast clouds Sunday, Nov 16 - Warmest/least ideal (score: 65) - 19.7°C with scattered clouds The cooler temperatures later in the week, especially Thursday, will provide better snow conditions. The overall period rates as "Good" for skiing with an average score of 74/100." A Claude chat window with the text: "Use the forecast-skill to tell me what are the best days for hiking in Colorado I'll first read the forecast skill to understand how to use it properly. Now I'll use the activity recommendation feature to find the best hiking days in Colorado. Since you're in Erie, Colorado, I'll check the forecast for a nearby hiking location. bash cd /mnt/skills/user/forecast-skill && python skills/get_weather.py activity hiking "Colorado" 5 Great news! The next 5 days look excellent for hiking in Colorado with an overall score of 92/100. Best Days (ranked): Today (Saturday, Nov 15) - Score: 95/100 21°C (70°F), scattered clouds, light winds Your best bet! Sunday, Nov 16 - Score: 94/100 21°C (70°F), scattered clouds, light winds Nearly as perfect as today Wednesday, Nov 19 - Score: 93/100 11°C (52°F), overcast but light winds Tuesday, Nov 18 - Score: 92/100 12°C (53°F), scattered clouds, light winds Monday, Nov 17 - Score: 86/100 16°C (61°F), scattered clouds, light winds Still excellent, just slightly cooler The weekend offers the warmest temperatures and best conditions. All five days have light winds and no precipitation expected, making them all great choices for hitting the trails!"
November 16, 2025 at 3:32 AM
loefflerlabs.com
I’ve just published TeXBloX, a free and open-source Forge app for Confluence that renders LaTeX math natively on your pages.

No CDNs, no data collection! It runs entirely on Atlassian’s infrastructure.

Marketplace link: marketplace.atlassian.com/apps/2235854...
A browser window displays a menu reading "LaTeX Formula Configuration", with a simple integral displayed inside. Below are controls for displaying the equation inline or block. Below that are buttons that display a quick example for the quadratic formula, an integral, a sum, and a matrix. Below that are a "Save Formula" and "Cancel" button pair. A browser window displays a page titled "LaTeX Demo" published on Confluence. On the page is the text "Hello world" followed by the formulas e=mc^2, the quadratic formula, a simple integral, a basic matrix, the Schrodinger equation, and a simple derivative.
November 9, 2025 at 5:47 PM
loefflerlabs.com
WindGuard, a free project I wrote that protects your inflatable holiday decorations with just a smart plug and a few minutes to deploy some code that checks your local weather to the cloud, was featured on Instructables today! #halloween #diy

www.instructables.com/Keeping-Ghos...
October 27, 2025 at 2:34 PM
loefflerlabs.com
"Quishing", or QR-code phishing, is on the rise!

www.QRTrust.fyi is a web app I made that you can use on your Android or iOS phone to scan QR codes and find out if the website they link to is suspicious. It works by checking each url against the crowd-sourced PhishTank database!
July 12, 2025 at 4:03 PM
loefflerlabs.com
Just glue some gears on it and call it Steampunk...

Spotted at Six Flags America
A red tractor in front of a carnival ride that has some non-functional sails, gears, and a brass horn glued onto it.
June 5, 2025 at 11:07 PM
loefflerlabs.com
Learn how to build your own map of MTA E-ZPass retailers and color-code them based on wheelchair accessibility using Python, Folium, and Netlify! This was my submission for the 2024 MTA Open Data Challenge (new.mta.info/article/cele...)! Link: github.com/kevinl95/ez-...
A map of New York showing the location of MTA E-ZPass retailers. Locations that are not accessible with wheelchairs are marked red, whereas accessible locations are marked green.
November 23, 2024 at 12:36 AM
loefflerlabs.com
My latest project was recently featured on Instructables! In this guide I will show you how to build a low-power credit card skimmer detecting keychain. These skimmers, often found in gas pumps and ATMs, emit a Bluetooth signal that this keychain can detect.
www.instructables.com/Making-an-E-...
A white rectangular device with an electronic ink screen displays "Devices found: 0" and on the next line "Skimmers found: 0". The device is dangled in front of a gas pump at a fuel station.
November 16, 2024 at 5:13 PM