If you want AI help built right into your messaging app, there are several good options. AI Chat is a personalized AI bot that you can use right in your phone's messaging app without having to download anything or set up a password. It remembers your previous conversations for the long term, has lots of customization options and can provide services like health advice and productivity tips. Prices range from a 10-message free trial to unlimited messages for $15 per month.
Another good option is ChatOga, which builds AI help into Telegram so you can get information and advice without having to switch away from the chat app. It offers live assistance and tight Telegram integration, with plans to expand to other chat apps like Messenger and WhatsApp. ChatOga offers free and premium tiers depending on your needs.
If you're a WhatsApp user, MobileGPT and WhatGPT are good options. MobileGPT uses OpenAI's large language models for conversational interactions, translation and content creation, among other abilities. It offers a 24-hour free trial and lifetime access for $149. WhatGPT offers quick reply suggestions and AI-curated answers, and offers free and paid tiers to help you get more out of WhatsApp.