Disclosure first: we're affiliates of both, so this page earns either way — which is why it can afford to route you honestly.
Two philosophies of the same idea.
Both tools exist because watching shows in your target language works. They disagree about where the shows should come from. Trancy's bet: the content already exists — you have Netflix, you watch YouTube — so the tool should be a layer on top, and the core of that layer should be free (unlimited translation and dual subtitles; the caps are 100 saved words and 50 sentences, with Premium at $42/year list to lift them). Lingopie's bet: choosing content is itself the hard part, so it licenses a library (5,000+ titles claimed, 15 languages), grades it, and wires the learning tools into its own player — for a subscription.
What that means practically, side by side.
Cost to start: Trancy $0 vs Lingopie's 7-day trial then payment (and note the trial's yearly-plan refund rule). Catalog: Trancy inherits whatever your services carry — enormous, current, but ungraded; Lingopie's is curated and searchable by level, but smaller and its own. Language fit: Trancy translates essentially anything; Lingopie is strongest for Spanish and major European languages, with Korean, Japanese and Mandarin present full list. Browsers: Trancy is the category's only Firefox option; Lingopie is a website and apps — no extension needed at all, which also makes it the only one of the two usable on a TV or tablet naturally. Study depth: near-parity, honestly — both save words with basic flashcard review; neither has Anki export or a serious SRS (learners who want that graduate to LangPanda from either).
Who each one actually fits.
Trancy: you already stream in your target language (or want to), you're budget-first, you're on Firefox, or you want web/PDF translation in the same tool. Lingopie: you're a beginner overwhelmed by choosing content, you want everything graded and in one place, you'd rather watch on a TV app than a desktop browser, or you're learning Spanish and want the deepest curated Spanish catalog anywhere. The failure mode to avoid on each side: Trancy users who never find suitable content and quit (curation was the thing they needed), and Lingopie subscribers who realize they only ever wanted to watch the Netflix shows their friends watch (the extension was the thing they needed — Lingopie's trial usually reveals this within its 7 days).