Sideload Spanish is a browser extension designed to help users learn Spanish while browsing the web. By replacing select English words with their Spanish equivalents on every page, it enables language acquisition through everyday reading rather than traditional drills or flashcards. The extension is aimed at individuals seeking to integrate Spanish learning seamlessly into their regular online activities without requiring dedicated study time or scheduled lessons.
The extension operates by running on every webpage the user visits, turning sites like news outlets, Wikipedia, and Reddit into opportunities for Spanish practice. Sideload Spanish introduces vocabulary through progressive tiers, starting with the 500 most common words and gradually advancing through five levels from A1 to C1 as users demonstrate familiarity. The tool includes a feature that detects when a user has encountered a word multiple times without marking it as known, prompting focused reinforcement of challenging vocabulary. Users can hover over any replaced word to see the original English and click to indicate when they have learned it.
Sideload Spanish is currently available as a free extension for Firefox, with a Chrome version pending review. The extension works offline and saves progress locally on the user's device. There are no usage limits, and the vocabulary includes over 5,000 words across the five proficiency tiers. The tool emphasizes user privacy, containing no tracking, analytics, telemetry, or fingerprinting, and ensures that browsing data never leaves the user's browser. If a planned cross-device sync feature is launched, it is intended to use end-to-end encryption so that only the user can access their progress data.
The extension is free to use with no payment required, and users interested in future sync capabilities can join a waitlist for updates. Sideload Spanish positions itself as a privacy-focused, context-driven language learning tool for those who want to learn Spanish passively while engaging with the web.
Sideload Spanish is an Education & learning product. It focuses on learning Spanish vocabulary passively while browsing the web, without flashcards or drills. It is built as a consumer product for language learners. The product is available for free. It runs on the web and embeddable surfaces.
mifupa builds and maintains Sideload Spanish, and the product first shipped in 2026. Development happens publicly on GitHub with 96 commits in the last 90 days. Key capabilities include inline word replacement, progressive vocabulary tiers, and hover translation.
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