Lernbuddy is a locally running AI-powered learning companion designed for children aged 10 to 14. The tool addresses privacy concerns by ensuring that all data, including prompts, learning history, and flashcards, remain solely on the user's device, with no network calls or telemetry. It is intended as an alternative to cloud-based AI tools, allowing students to use AI assistance for homework without sending personal information to external servers.
The application offers three main features, all driven by the Gemma 4 E4B language model. First, it provides a Socratic chat function, where the AI gives hints rather than direct answers, with system prompts tailored to offer specific praise and to avoid solving tasks outright. Second, Lernbuddy enables the creation of flashcards from school texts or topics; the model can generate a deck based on general knowledge, and cards are previewed for editing before being added to the database. Third, it includes a quiz feature with model-validated free-text answers, where the AI evaluates responses as correct, nearly correct, or incorrect, tolerating typos and rephrasings, and generates brief, personalized feedback summaries. The quiz system incorporates a small SM-2 algorithm for spaced repetition, ensuring that incorrectly answered cards are revisited soon, while mastered cards are spaced further apart. Progress is tracked through a streak counter and topic-specific badges, making achievements visible without a dedicated dashboard.
NET 9 MAUI application, targeting Windows, Android, iOS, and macOS (via macCatalyst). The app is bilingual from the outset, with German as the main language and English as the default for international demos. AI and implemented using LLamaSharp, running the unsloth/gemma-4-E4B-it-GGUF model locally. The application's architecture prioritizes responsiveness, breaking long texts into smaller segments to reduce perceived wait times, and features a persistent status banner for model activity updates.
The tool is distributed under the MIT license, and its source code is available on GitHub. Lernbuddy exemplifies a local-first approach to AI-powered educational tools for young learners, with a strong emphasis on privacy and device-resident processing.
In the AI & ML space, Lernbuddy takes a focused approach. It focuses on providing a safe, private AI learning assistant for children without sending data to the cloud. It is built as a consumer product for students aged 10–14 and their parents. Lernbuddy costs nothing to use. The product ships for the web, Windows, macOS, and Linux, and it can be self-hosted.
Behind Lernbuddy is piwonka.cc, based in Austria, and the product first shipped in 2026. Development happens publicly on GitHub with 4 commits in the last 90 days. Key capabilities include socratic chat, flashcards, and offline mode.
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