Of the extensions out there, Vocabo is the closest match to what Hari does: it swaps words into the pages you're already reading, with no flashcards and no separate study time. It's also completely free, with no premium tier, no subscriptions, and no ads, and it supports a wide range of languages. That's a real, honest advantage worth naming upfront — this isn't a comparison where one tool is simply better across the board.
What Vocabo does well
Free with no limits is hard to beat on price, and Vocabo backs that up with visible proof — a high rating on the Chrome Web Store and a stated user count. For someone who wants lightweight word exposure across any of 249+ languages with zero commitment, it's a reasonable, no-risk choice.
Where it falls short for a heritage speaker
Vocabo is built to cover many languages for many people, which means the words it surfaces aren't chosen with any particular community in mind. It has no spaced repetition system bringing words back around as you're about to forget them, and nothing in its design is oriented toward the specific job of reconnecting with a heritage language — understanding family conversations, Taglish code-switching, the vocabulary that actually comes up at home.
Where Hari wins
Hari is built around one audience and one goal, which shows up in the specifics: a hover dictionary with pronunciation and example sentences, spaced repetition that resurfaces words right before you'd forget them, and word selection oriented toward Fil-Am reconnection rather than general vocabulary breadth. Hari's free tier isn't unlimited like Vocabo's, but it's enough for several full browsing sessions a month, and the paid tiers are transparent about exactly what you get.