100% Free

A Truly Free Vocabulary App

No ads. No subscription. No "premium" paywall. penguen.io is genuinely free — because we believe vocabulary learning shouldn't cost money.

Start Free Now See All Features

Comparison

What "Free" Actually Means

Most "free" apps are anything but. Here's how penguen.io compares.

Feature penguen.io (Free) Typical "Free" Apps

All practice modes Yes Limited

Spaced repetition Yes Premium

Offline mode Yes Premium

Collections 640+ 5-10 free

Ads None Yes

Time limits None Daily hearts

Included

Everything Included

No features locked behind a paywall. Everything works from day one.

6 Practice Modes

Flashcards, multiple choice, fill-in-the-blank, matching, dictation, listen & choose

AI Spaced Repetition

Adaptive algorithm that learns how you learn

640+ Collections

Professionally curated vocabulary sets

Offline Mode

Download and study without internet

Progress Tracking

Streaks, stats, heatmaps, and mastery tracking

Leaderboards

Compete with learners worldwide

AI Pronunciation

Hear every word spoken by AI

Cross-Device Sync

Pick up where you left off on any device

11 Languages

Translations in your native language

Our Mission

No Catch

We built penguen.io because vocabulary learning should be accessible to everyone, everywhere. Not just people who can afford a $10/month subscription. Not just people in countries where "premium" pricing is reasonable.

Every learner deserves access to effective tools — AI-powered spaced repetition, multiple practice modes, curated content, and offline access. That's why everything on penguen.io is free. No asterisks.

Explore the flashcard app Learn about spaced repetition

Free App FAQ

Is penguen.io really free? expand_more

Yes, 100% free. No ads, no subscription fees, no paywalls, no daily limits. All features are included at no charge.

How do you make money then? expand_more

We believe vocabulary learning should be accessible to everyone. penguen.io is built as a mission-driven project focused on making language learning free and effective for learners worldwide.

Will it always be free? expand_more

Our core features — all practice modes, collections, spaced repetition, and offline mode — will always remain free. We're committed to keeping vocabulary learning accessible.

What's included in the free plan? expand_more

Everything! All 6 practice modes, 640+ curated collections, AI spaced repetition, offline mode, progress tracking, leaderboards, and cross-device sync. There is no paid plan.

Start Learning — It's Free, Really

No credit card. No trial period. No catch. Just open penguen.io and start learning.

Create Free Account Browse Collections