Learn English The Smart Way
AI-driven translation exercises, grammar correction, and pronunciation coaching - designed for real ESL learners worldwide.
What Poly-Puff Means
Poly comes from the Greek polys, meaning many. Puff suggests a small, soft cloud, like an internet cloud for language practice. Together, Poly-Puff means many languages and ideas gathered in one light place to learn.
Built Different
Not just another flashcard app. Real grammar intelligence, real-time feedback.
340 grammar rules are checked before any AI call. Hard rules always win - "a university" is always correct, no matter what the model thinks.
Visual progress rings transition from red to emerald as your score improves. See exactly where you stand on every exercise.
Hear the native-speaker version at 0.9× speed for clarity, then hear your own translation played back to spot flow issues.
GDPR, COPPA, POPIA, Egypt PDPL, LGPD - smart age gates and parental consent flows for every jurisdiction.
Tap any underlined error to see the exact grammar rule that applies. No vague feedback - specific, citable corrections.
Teachers can assign exercises, track class progress, and set daily challenges - built for real ESL classrooms.
All Web App Modules
Every aspect of language learning, covered.
Translation Trainer
Your Language, Your Way
Grammar feedback supports 45 native languages. Website language options stay limited to reviewed translations.
Built for Every Learner
Age-appropriate, privacy-first, compliant in every country we operate.
16+ age gate for EU users. One-click data deletion. Cross-border transfer disclosures. EU AI Act Limited Risk classification.
13+ default age gate. Parental math-challenge consent gate. Click-to-cancel subscription support. No dark patterns.
18+ age gate for South African users. SARS VAT disclosure (15%). Data subject rights fully implemented.
12+ age gate for Brazilian users. Demonstrated responsibility framework. Parental consent for under-18 users.
15+ age gate implemented. PDPL Executive Regulations issued; compliance review, PDPC licensing/permit requirements, and cross-border transfer approval are in progress before late-2026 enforcement.
18+ age gate. Sovereign data disclosure. Cross-border transfer notification to US-based OpenAI servers.
Start Learning Today
Download the app or try the web version - free to start.