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Lengio
by Lengio
What Lengio is
Lengio is a freemium visual vocabulary learning app from a Chicago-based maker. Native iPhone and Android apps provide guided lessons, word categories, flashcards, quizzes, spaced repetition, offline lessons, and speech practice. Vocabulary entries include an AI-generated image and natural-sounding audio. Its AI speech partner supports free-form conversation in 25 languages, adapts to the learner’s level, offers topic prompts, and gives grammar and word-choice feedback. The Free plan costs nothing and includes core lessons, word browsing, flashcards, and daily reviews. Lengio Plus adds unlimited daily reviews, the full vocabulary library, custom card images, six vocabulary games, and an AI Speech Partner; a lifetime purchase option is listed, but no Plus price is stated. The app requires iOS 17 or later or Android 8.0 or later. Vocabulary, personal card photos, and progress stay on the device, with no Lengio server-side sync.
Who it suits
It suits mobile learners who want visual vocabulary practice, offline lessons, speech conversation, and review tools. The free plan supports core study, while Plus targets users wanting expanded content and games.
What it does well
- Supports 25 languages
- Offline lessons available
- AI speech practice with feedback
- Free core lessons and flashcards
- Study data stays on device
What to know first
- Requires iOS 17+ or Android 8+
- No server-side account sync
- Free plan covers one core feature set
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Free | Core lessons · Word browsing · Flashcards · Daily reviews | Free |
| Lengio Free | Free to download and use every day; one chosen language; AI speech partner from day one | Free |
| Lengio Plus | All 25 languages · Games hub · Use your own photos on any card · Unlimited AI practice | On request |
As lengio.app lists them, read 19 Sept 2026. The maker's own page has the final word.
Verdict
Lengio combines visual vocabulary study, offline lessons, spaced review, and AI conversation on iPhone and Android. Its free plan covers core learning, while Plus adds broader content and practice without a listed price.
Facts from Lengio's own pages
- Account and sign-in
- The site says users can start with a free account on iPhone and iPad using an emailed code, Apple, or Google sign-in. · lengio.app, 12 Oct 2026
- AI and voice privacy
- For AI chat, Lengio says its servers receive the speech-to-text result, not audio; on iOS transcription is on-device, while Android behavior depends on the device and settings. · lengio.app, 12 Oct 2026
- AI tutor
- The AI tutor supports free-form conversation in 25 languages, gives contextual grammar and word-choice feedback, adapts to the learner's level, and offers topic prompts. · lengio.app, 12 Oct 2026
- Analytics and advertising
- The app records anonymous usage events that can be switched off in Settings, and the privacy policy says it has no third-party analytics or advertising SDKs. · lengio.app, 12 Oct 2026
- Company
- The privacy policy identifies the operator as Nexios Media LLC, an Illinois limited liability company trading as Lengio. · lengio.app, 12 Oct 2026
- Data stored locally
- Vocabulary, personal card photos, and study progress stay on the device; the privacy policy says Lengio has no account system or server-side sync of its own. · lengio.app, 12 Oct 2026
- Free plan
- Yes · lengio.app, 19 Sept 2026
- Games and video
- Lengio Plus includes six vocabulary games; AI-generated conversation videos are available across all 25 languages. · lengio.app, 12 Oct 2026
- Headquarters
- Chicago, Illinois, United States · lengio.app, 28 Sept 2026
- Integrations and providers
- The privacy policy names Apple App Store and iCloud services, Google Play and Gemini API, Cloudflare, and optional Google Image Search as service providers or integrations. · lengio.app, 12 Oct 2026
- Language coverage
- Lengio lists 25 languages and says its packs include lessons, audio, and imagery. · lengio.app, 12 Oct 2026
- Languages offered
- 25 · lengio.app, 19 Sept 2026
- Learning modes
- Lessons use step-by-step sequences with mini-exercises, while quizzes and flashcards include spaced repetition. · lengio.app, 12 Oct 2026
- Mobile apps
- Yes · lengio.app, 19 Sept 2026
- Mobile requirements
- The app is native on iPhone and Android and requires iOS 17 or later or Android 8.0 or later. · lengio.app, 12 Oct 2026
- Offline lessons
- Yes · lengio.app, 19 Sept 2026
- Personalized review
- Yes · lengio.app, 19 Sept 2026
- Product
- Lengio is a visual vocabulary learning app with guided lessons, word categories, flashcards, quizzes, and an AI speech partner. · lengio.app, 12 Oct 2026
- Security
- The privacy policy lists HTTPS/TLS for site and language-pack traffic, operating-system sandboxing and on-device encryption, access controls, and routine review of providers' security posture. · lengio.app, 12 Oct 2026
- Speech practice
- Yes · lengio.app, 19 Sept 2026
- Support
- The privacy policy directs support and privacy requests to email and says it aims to acknowledge privacy requests within five business days and resolve them within 30 days. · lengio.app, 12 Oct 2026
- Visuals and audio
- The app provides an AI-generated image and natural-sounding audio for vocabulary entries. · lengio.app, 12 Oct 2026
Where Lengio stands on Freedom251
- Language learning apps#155 of 278