Week in review: Firefox extension, pricing accuracy overhaul, and dealing with a trademark conflict
Big shipping week on Underpriced AI (AI-powered resale valuations from photos). Here's everything that went out:
🔧 What shipped
Firefox extension – Ported the Chrome extension to Firefox MV3. Took about a day. The main gotchas: Firefox doesn't support MAIN world script injection, web_accessible_resources needs a slightly different manifest format, and they now require a data_collection_permissions field. Published on AMO: https://addons.mozilla.org/en-US/firefox/addon/underpriced-ai/
Pricing accuracy overhaul – This was the meatiest work. Integrated real eBay sold data via the Finding API, added IQR outlier removal so one $5,000 sale doesn't skew a $50 item, condition-matched pricing, and recency-weighted blending of sold vs. active listings. Users can now see actual sold listing cards alongside the AI estimate.
Cross-platform fee calculator – Shows net profit after fees on eBay, Poshmark, Mercari, Facebook Marketplace, and Etsy. Small feature, big impact — resellers always want to know "what do I actually pocket?"
Reddit engine – Built a daily digest cron that surfaces reselling subreddit activity. Early experiment in community-driven growth.
Chrome extension upgrades – Added hint forms (enter brand/item type before scanning for better accuracy), inline result overlays with refine and save-as-image, and fixed Reddit image scanning.
⚖️ The trademark situation
Something I didn't anticipate: another company operates in the reselling space under "Underpriced." I discovered this after I'd already built the product, registered the domain, published to the App Store, and started getting users.
Options were:
1. Rebrand everything (painful, expensive, lose SEO)
2. Add a clear disclaimer and keep building
I went with option 2. Added "Underpriced AI is independently developed and is not affiliated with other services using the name 'Underpriced'" to the website footer, app store listings, and the new Firefox Add-on. It's not glamorous, but it's the pragmatic choice for a solo founder.
Has anyone else run into this? How did you handle it?
📊 By the numbers
- 54 commits this week
- 3 platforms (web, Chrome, Firefox)
- iOS app live, Android coming soon
What's next: Continuing to improve pricing accuracy with more data sources, and working on the Android app.
#buildinginpublic #indiehackers #solofounder #ai #saas #reselling #browserextension #firefox #chrome #shipping #trademark #weekinreview
