Dotta

Have you downloaded ChatGPT on your grandparents' phones only to find they inadvertently revert to GPT3.5 (now 4o mini) all the time, they also start talking to it before it has secured a connection and they get interrupted continuously by it while they are trying to ask questions? The whole thing is a mess. You want them to be able to access the latest and greatest model, but the regular app just doesn't work for them. The subscription is also very expensive.
Dotta comes to your rescue. It is designed to be the easiest interface in the world to interact with the latest model by OpenAI. It is older-person proof, with big clear buttons containing text that explains exactly what they are for (in 30 languages!)
The API Key remains securely in the iPhone, stored in the Keychain. Dotta doesn't have servers, everything happens on the phone. No one can see the Key, not even your grandpa because the moment it is inserted, together with an expense limit, it is hidden and keeps working until the expense limit is reached. 
Dotta is your grandparents' best friend!

Key Features:

-Voice chat with the latest OpenAI model
-User-friendly interface designed for all ages
-Secure local storage of OpenAI API key on the iPhone's Keychain
-No subscription required - use your own API key
-30 different supported languages

How It Works:

-Enter the OpenAI API key
-Set a spending limit
-Start chatting

Note: This app requires an OpenAI API key. Users are responsible for any charges incurred through their API usage. And as owners of the Key, they are responsible for how the Key is used.