Master English with AI-powered translation exercises, grammar feedback, and pronunciation coaching. Built for ESL students worldwide. The mobile app is currently available on the Google Play Store.
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Maker
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I started building Poly-Puff for my own students - I wanted them to be able to conveniently practice English outside of class, with great exercises all in one place instead of scattered across a dozen apps and worksheets.
Most language apps either drill vocab in isolation or lean entirely on an LLM for corrections - which means the grammar feedback can be inconsistent or just wrong. Poly-Puff cross-checks every correction against a database of 340 grammar rules across 35 categories before it ever calls the AI, so the feedback is accurate, not just plausible-sounding. Students translate sentences from their own native language into English and get instant, rule-backed feedback - plus pronunciation coaching and CEFR-leveled exercises from A0 to C2.
It's Android-first right now, and I'm looking for closed testers to help me stress-test it before a wider launch. Drop a comment (or DM me) with the Gmail address you'd like invited on, and I'll add you to the tester list. Would love your feedback, especially if you're learning English or teach ESL yourself.
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💎 Pixel perfection
The real-time pronunciation feedback is surprisingly smooth, and I love that it corrects you without making you feel dumb about it. Really thoughtful build for ESL learners.
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💎 Pixel perfection
Love how the pronunciation coaching feels integrated rather than tacked on, like it's actually part of the lesson flow instead of a separate feature. Clean UX choice that makes a real difference for ESL learners juggling multiple skills at once.
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Tried the pronunciation part for like five minutes and it actually caught a sound I'd been mispronouncing forever, so that was genuinely cool. Feels pretty beginner-friendly too, not overwhelming.
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The pronunciation coaching feature looks really well thought out, especially for ESL learners who often struggle with getting real-time feedback on tricky sounds. Clean execution.
The real-time pronunciation feedback is surprisingly smooth, and I love that it corrects you without making you feel dumb about it. Really thoughtful build for ESL learners.
Love how the pronunciation coaching feels integrated rather than tacked on, like it's actually part of the lesson flow instead of a separate feature. Clean UX choice that makes a real difference for ESL learners juggling multiple skills at once.
Tried the pronunciation part for like five minutes and it actually caught a sound I'd been mispronouncing forever, so that was genuinely cool. Feels pretty beginner-friendly too, not overwhelming.
The pronunciation coaching feature looks really well thought out, especially for ESL learners who often struggle with getting real-time feedback on tricky sounds. Clean execution.