We're here to help you get the most out of Lumen AI.
Have a question, issue, or feedback? Reach out to our support team and we'll get back to you within 24 hours.
Email Supportsupport@sumhead.com
Your subscription is managed through Apple. Open your iPhone Settings, tap your name at the top, then tap Subscriptions. From there you can view your current plan, change your subscription tier, or update your payment method. All billing is handled securely by Apple through the App Store.
To cancel, go to iPhone Settings > tap your name > Subscriptions > Lumen AI > Cancel Subscription. You will continue to have access to premium features until the end of your current billing period. If you're still within the free trial, you won't be charged.
After downloading Lumen AI, set up at least one AI provider in Settings by adding your API key. Then start a new conversation from the home screen. Type your message and the selected AI model will respond. You can switch between models, use the AI Council feature to get responses from multiple models at once, or use Camera Vision to analyze images.
Go to Settings within Lumen AI and tap on the AI provider you want to configure (such as OpenRouter, DeepSeek, Google Gemini, Groq, Together AI, or Kimi). Enter your API key in the field provided. Your keys are stored securely in Apple's Keychain on your device and are never sent to our servers. You can get free API keys from providers like OpenRouter at openrouter.ai.
Yes. All conversations are stored locally on your device. API keys are kept in Apple's hardware-encrypted Keychain. We do not operate servers that store your data. All network communication uses HTTPS/TLS encryption. See our Privacy Policy for full details.
The AI Council sends your question to multiple AI models simultaneously. Each model responds independently, and then a synthesized "Council Verdict" combines the best insights into one answer. You need API keys for at least two providers to use this feature.