If you’ve ever tried learning the Rebbe’s sichos, you know the moment. You’re deep into a sicha, following the thread of an idea, when a single word throws you off. Otzar Likkutei Sichos combines a straightforward concept with careful design. At its core is a dictionary with over 14,000 entries, each tied to the language and context of Likkutei Sichos.

If you’ve ever tried learning the Rebbe’s sichos, you know the moment. You’re deep into a sicha, following the thread of an idea, when a single word throws you off completely. Not a big, flashy word, but a chassidic term with a very specific meaning that doesn’t come through in a regular dictionary. Words like התכללות or בירורים appear constantly, but unless you’ve already learned them well, they can throw you off.

That exact experience is what led Mendel Gottlib, a Lubavitcher with a background in both Torah and tech, to build Otzar Likkutei Sichos, a learning app now live on both the Apple App and Google Play Store. It serves as a digital study platform specifically designed for studying the Lubavitcher Rebbe’s Likkutei Sichos, with an emphasis on understanding Chassidic terminology and context.

“Every time I learned Likkutei Sichos, I’d hit a wall with terminology,” Gottlib says. “Words have specific meanings in Chassidus that regular dictionaries completely miss.”

Otzar Likkutei Sichos combines a straightforward concept with careful design. At its core is a dictionary with over 14,000 entries, each tied to the language and context of Likkutei Sichos. The goal is to let learners look up a term and get an explanation that actually fits the way the Rebbe uses it without needing to pause the sicha or bounce between resources. Once downloaded, the dictionary works offline, making it usable in almost any setting.

“I was tired of juggling multiple resources, losing context while looking up words, having no systematic way to build chassidic vocabulary. Study sessions were turning into translation sessions.”

Beyond the dictionary, Otzar Likkutei Sichos offers tools to help users track and reinforce what they’re learning. You can bookmark terms, write notes, and build custom vocabulary lists. The flashcard system is available to premium users and is designed to support review and long-term retention, although it is still under development and undergoing improvements. An AI chat feature is also in development. Its responses are inconsistent due to the challenge of training models on niche religious content. This remains an area of ongoing refinement.

Search functionality spans the full corpus of sichos, letting users track concepts and follow themes. List sharing with deep links is also included, although this feature is not yet fully functional and will be finalized in an upcoming update.

Built using Flutter and Firebase, it delivers solid offline performance and is structured for future scalability. It’s a project that balances simplicity on the surface with a lot of work under the hood. As Gottlib puts it, “Challenges that were fun to solve: building offline with Flutter and Firebase, deep linking that actually works for sharing vocabulary lists, making flashcards.”

The app uses a freemium model. “Torah should be free. But servers, AI APIs, and development time aren’t.” So while the full dictionary is free for everyone, features like unlimited lists, advanced flashcards, cloud sync, and AI chat are part of the premium tier. The approach is designed to let serious learners support the broader user base.

Otzar Likkutei Sichos is still in beta, with ongoing development and regular updates rolling out. Some features are unfinished, and bugs may still show up. But even in its current form, the app offers something useful and focused, a study tool built specifically for learning the Rebbe’s Torah by someone who knows the frustration of not having one. If you’ve faced the same hurdles while learning the Rebbe’s Torah, Otzar Likkutei Sichos was built with you in mind.

It’s available now on the Apple App Store and Google Play Store under “Likkutei Sichos, לקוטי שיחות”:

• Download on the Apple App Store
• Download on Google Play Store