// FAQ
Do I need an account to use the app?
No. Download the app and use it in Sandbox mode for free, forever. An account is only needed to activate a paid plan or use the Mulberry API without your own key.
What is BYOK?
Bring Your Own Key — paste in your own API key from OpenAI, Anthropic, OpenRouter, or Google Gemini and the app uses it directly. Available on Connect and above.
What is the Mulberry API?
Signed-in Connect+ users can use Mulberry's hosted inference endpoint without needing a third-party key. ✦ Mulberry Auto selects the best model for your request. ✦ MojoJojo is our independently developed language model on Inference+.
What does "on-device" mean?
The model runs on your phone. Nothing is sent to a server and it works in airplane mode. This is free: Sandbox includes Apple Intelligence chat and one imported local model of your own. What the paid plans add is the layer around it — tool calls, agents and workflows on Inference, tuning and personalization on Brain Tuning.
Why is running a local model free?
Because the weights cost us nothing to serve, and a plan that hides them behind a paywall never lets you find out what you actually want. Import a model and talk to it on the free tier. The work we charge for is the engine around it: getting a small model to call tools, edit files correctly and stay on task.
Can I switch plans?
Yes. Upgrade or downgrade anytime from your
account page. Billing is prorated to the day.
How is payment handled?
Payments are processed by Stripe. We never store card details. The app ships direct/notarized — not through the App Store — so there are no Apple IAP fees passed on to you.