10 Things You Can Do With AI Without Internet

Every major AI assistant — ChatGPT, Claude, Gemini — requires an internet connection. Type a prompt on a plane, in a subway tunnel, or at a campsite with no signal, and you get a loading spinner followed by an error message.

Google's AI Edge Gallery recently brought some models to Android devices locally, but it's still limited in context window and doesn't integrate with system features like Shortcuts or Share extensions.

Cortis takes a different approach. It runs a real language model entirely on your device — iPhone or Android — with zero cloud dependency. Here are 10 things you can actually do with it when you have no internet at all.

1. Draft Emails on a Flight

Airplane mode doesn't have to mean unproductive mode. Tell Cortis the key points you want to hit, and it drafts a full email you can paste into your mail app when you land. Write three or four drafts during a cross-country flight and send them all the moment you connect.

2. Summarize Meeting Notes in the Subway

Copy your messy meeting notes, share them with Cortis, and get a clean summary with action items before you reach your stop. Works in underground stations, tunnels, and anywhere your signal drops to zero.

3. Translate Text Abroad Without Roaming

Traveling internationally without a data plan? Paste a menu, a sign, or a message into Cortis and get a translation. It won't replace a dedicated translation app for obscure language pairs, but for major languages it handles everyday text well.

4. Brainstorm Ideas While Camping

Some of the best ideas come when you're disconnected. Use Cortis as a thinking partner to explore startup ideas, plan a project, or work through a creative block. No cell tower needed.

5. Practice Language Learning Offline

Ask Cortis to have a conversation with you in Spanish, French, or another language. Request corrections, ask for vocabulary explanations, or practice writing sentences. It's not Duolingo, but it's surprisingly useful for free-form practice when you don't have internet.

6. Code Review Without Wi-Fi

Paste a function or code snippet into Cortis and ask it to review for bugs, suggest improvements, or explain what the code does. Useful on commutes or when working from a cafe with unreliable internet. The 1B model handles straightforward code well; Pro models handle more complex reviews.

7. Generate Journal Prompts

Staring at a blank journal page? Ask Cortis to give you a thoughtful writing prompt based on a theme — gratitude, career reflection, creativity, relationships. It generates a fresh prompt every time, no internet required.

8. Quick Research in Areas With Bad Signal

At a conference center with terrible Wi-Fi? In a rural area? Cortis can answer factual questions, explain concepts, and provide background information using the knowledge baked into its model. It's not a search engine — it can't give you today's news — but for general knowledge, it works.

9. Prepare Presentation Talking Points

Feed Cortis your slide titles or key themes and ask it to generate talking points, transitions, or a rough script. Useful the night before a presentation when you're in a hotel with spotty internet, or on the train ride to the venue.

10. Explain Complex Topics to Kids

"Why is the sky blue?" "How do magnets work?" "What's DNA?" Cortis can break down complex topics into simple, kid-friendly explanations. Great for long car rides, waiting rooms, or any moment when your child asks a question and you don't have Google handy.

The Tradeoff

We should be honest: on-device models are smaller than cloud models. The free Llama 3.2 1B model in Cortis is capable but not as powerful as GPT-4o or Claude Opus running on a data center. For complex reasoning, multi-step analysis, or very long documents, cloud models are still better.

But for the 10 use cases above — and dozens more like them — a smaller model running locally with zero latency, zero cost per query, and zero data transmission is often the better tool.

Try Cortis

Cortis is available for free on the App Store and Google Play. The offline AI, Siri integration, Shortcuts support, and Share Extension all work on the free tier. Download a model once over Wi-Fi, and it's yours to use anywhere — forever.

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NERON LLC builds AI tools that respect your privacy. Cortis is our on-device AI assistant for iOS and Android.