Best Confidential AI Apps for Android of 2025

Lumo is an AI assistant focused on privacy, designed to harness the capabilities of generative AI while ensuring complete confidentiality in your conversations. Created by the privacy specialists behind Proton Mail and VPN, Lumo guarantees that your discussions are private, with no logs stored on its servers, and all saved conversations encrypted with zero-access encryption, which means that even Proton cannot access them. With an open-source framework, the service is both transparent and verifiable, allowing users to engage with it confidently. You can inquire about various topics with Lumo, whether it's summarizing documents, rewriting emails, assisting with coding, translating text, brainstorming ideas, and much more, all without worrying that your data will be used for training models or shared with outside parties. Conversations are protected with end-to-end encryption, and if you enable the AI’s web search feature, it utilizes privacy-conscious search engines. Accessible without the need for registration and available through both web and mobile applications, Lumo provides options for both free and premium plans. With its commitment to user privacy, Lumo stands out as a reliable choice for anyone concerned about the security of their information while interacting with AI.

Jatter is a chat application powered by AI that prioritizes your privacy and anonymity through client-side encryption, meaning that only you possess the key to access your messages while the service does not store any chat history. It enhances user privacy by removing personal identifiers before any processing occurs and enables you to quickly create emails, documents, or notes without compromising encryption. Additionally, Jatter offers detailed, tailored responses to a wide range of technical and creative inquiries, fostering a more efficient learning experience. When you mention locations, the app conveniently links them to maps, making trip planning and finding restaurants or attractions simpler, and it also features end-to-end encrypted location sharing for safely updating friends or colleagues about your position. Built on the GPT-4o Mini framework with integrated mapping capabilities, Jatter merges strong privacy measures with a diverse array of chat functionalities for thoughtful and secure discussions. Furthermore, its user-centric design ensures that every interaction remains protected while enhancing the overall communication experience.