AI tools have become a normal part of my daily workflow, but I've noticed one small problem that keeps coming up: some prompts are worth saving. I reuse certain prompts for data analysis, research, formatting, brainstorming, and internal work tools. Digging through old chats to find them isn't exactly efficient. So I decided to build something I'd actually use: a simple Chrome extension for saving, organizing, and reusing prompts from the browser.
I kept the test simple and consistent
To make the comparison fair, I gave ChatGPT, Claude, and Gemini the same project brief and judged them against the same expectations. The extension had to use Chrome's Manifest V3 format, rely only on HTML, CSS, JavaScript, and local browser storage, and work without an account, server, or Chrome Web Store release. At minimum, it needed to save prompts with titles, show them in a popup, copy them to the clipboard, edit saved prompts, and delete the ones I no longer needed. I also paid attention to more than just whether the code worked. I looked at how useful the first answer was, how well each tool guided a beginner, how complete the files were, how it handled rough edges, and whether I actually felt confident following its instructions.
At the time of testing, I used the highest free version I could access on each platform: GPT-5.5 on ChatGPT's Free tier, Claude Sonnet 4.6, and Gemini 3.5 Flash. Since I don't pay for all three services, this felt like the fairest way to compare what a typical reader could try for themselves.
The two prompts I used for each platform are listed at the end of the article.
ChatGPT gave me a working extension almost immediately
It was useful right away, but not quite polished
ChatGPT was fast to turn the idea into something usable. It did a good job explaining the overall process, laying out the basic files I needed, and getting me from prompt to working prototype in about five minutes. The extension was simple, but it worked: I could save prompts, view them in the pop-up, copy them to the clipboard, and delete the ones I no longer needed.
The main thing I wanted more of was technical explanation. ChatGPT told me what to do, but it could have gone a little deeper on what each code snippet was actually doing. That matters if you're new to building extensions and want to understand the project instead of just copying files into a folder. I also wish the extension inserted a saved prompt directly into the active text field instead of making me click copy and paste it manually. To be fair, ChatGPT did suggest that as a future improvement, along with several smart upgrades for security and usability. Overall, ChatGPT made a strong first impression because I ended up with a working extension quickly and a clear path for making it better.
Gemini made the project easy to follow
It was better at explaining the project than improving it
Gemini was fast, and I liked the way it presented the code. The color-coded snippets made the response feel more like working inside a real code editor, which made it easier to scan the different files and understand where everything belonged. The extension also did what it was supposed to do. I could save prompts, view them, copy them, and delete them from the pop-up.
Where Gemini stood out was in how it explained the structure of the project. It did a slightly better job walking through the directory layout and explaining what each code snippet actually did. It also gave clear, layperson-friendly instructions for loading the unpacked extension into Chrome, which is exactly the kind of detail that helps if you haven't built a Chrome extension before. Like ChatGPT, it didn't insert a saved prompt directly into the selected text field, so the workflow still depended on copying and pasting manually.
Gemini's improvement suggestions were solid, and it did a good job explaining the what, why, and how behind each upgrade. I just thought ChatGPT had the better recommendations overall. Gemini made the project feel easier to understand, but I would have liked to see more ambitious ideas for making the extension better. For example, it didn't go as far on security improvements or suggest inserting a saved prompt directly into the active text field.
Claude gave me the best extension, but explained the least
It felt more finished, even if the process was harder to follow
Claude was the slowest of the three platforms, but it also took a different approach. Instead of only giving me the code to copy into separate files, Claude packaged the project and gave me the extension files in a ZIP file. That made the handoff feel more complete, but it also meant there was less step-by-step explanation of the file structure than I got from some of the other tools.
Claude's extension included the core prompt-saving features I asked for, but it also went further with useful additions like search and tags, which matter once you have more than a handful of saved prompts. The tradeoff was that Claude gave me the least explanation along the way. It produced the most capable extension, but I had to trust the output more than I had to understand it.
When I asked about upgrades, Claude came back with a long list of possible improvements and did a fair job explaining why they mattered. That helped make up for some of the lighter setup explanation, but the overall pattern stayed the same: Claude was better at delivering a polished result than teaching me how the project worked.
Claude built the extension I'd actually want to keep using
It won because it solved the problem, not because it explained it best
Claude was my winner because the assignment wasn't just to explain how a Chrome extension works. It was to build a usable first version of a prompt-saving tool, and Claude came closest to that goal. ChatGPT was easier to follow as a beginner, and Gemini made the project feel organized and polished, but Claude delivered the app that felt most useful after the test was over.
The biggest difference was that Claude thought beyond the basics. Its extension included search, tags, better prompt organization, helpful pop-up messages, a cleaner interface, and a dark mode color scheme that made it feel more like a real tool than a throwaway demo. Those details matter once you save more than a handful of prompts, because the problem becomes finding, sorting, copying, and managing them quickly. Claude's version still needed cleanup, including better storage handling, stronger accessibility around the delete confirmation window, and a way to export and import prompts. But it produced the best app, not just the clearest lesson, and it was the only one that started to feel like a practical tool instead of a basic coding exercise.
The best AI tool depends on what you need from it
This test reminded me that "best" depends on the job. ChatGPT was the easiest to follow, Gemini did the best job making the project feel organized, and Claude delivered the strongest finished prototype. That matters because AI coding tools aren't just competing on whether they can generate code anymore. They're competing on how well they understand the actual problem you're trying to solve. For this project, Claude got closest to building something I'd keep using, but the bigger takeaway is that these tools are better when you know how to judge the output instead of just accepting the first answer that works.
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Here is the first prompt I'm using on each platform:
I want to build a beginner-friendly Chrome browser extension using Manifest V3. The extension should let me save, view, copy, edit, and delete reusable AI prompts for browser-based AI tools like ChatGPT, Gemini, and Claude. Please create the full project using plain HTML, CSS, and JavaScript. It should store prompts locally in the browser, not on a server. Include all required files, including manifest.json, popup.html, popup.css, and popup.js. Explain where each file goes and how I can load the unpacked extension in Chrome for testing. Assume I have never built a browser extension before.
I also used one follow up prompt give each platform an opportunity to make some changes or edits.
Now review this as if it were a small real-world browser extension project. What would you improve before using it regularly? Focus on code organization, maintainability, user experience, permissions, privacy, and future features. Then recommend the next three changes I should make.
