UsingOpen vs Thetatron
A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.
UsingOpen compared with Thetatron
| Detail | 
UsingOpen | 
Thetatron |
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| What it does | Free AI chat with open models, no account or sign-up required
| Brain-based AI that learns on your device without retraining, remembers you, and keeps your data private
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| Stage | Not given
| Startup
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| Founded | Not given
| 2026
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| Based in | Not given
| US
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| Pricing model | Free
| Not given
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| Pricing | Free with 10 prompts per day. UsingOpen Studio desktop app is $19 USD one-time purchase, or ¥99 CNY in mainland China.
| Not given
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| Key features | - Access to 20+ open-weight AI models including DeepSeek, Qwen, GLM, Gemma, GPT-OSS, Kimi K3 and MiniMax M3
- No account required, no sign-up, no email or password needed
- 10 free prompts per day, reset at midnight UTC
- Chat history saved locally on your device, never sent to servers
- Streaming responses with visible reasoning for thinking models
- Compare two models side by side in the same conversation
- Live model availability status and real-time capacity information
- Responsive design, installable as standalone mobile app
| - Learns continuously on your device without retraining
- Remembers individual users separately
- Runs fully offline on consumer hardware like iPad
- Learns without forgetting existing knowledge
- Consistent performance over long conversations
- Honest about uncertainty
- User controls what it learns
- Works with existing language models
- Corrected facts replace outdated information
- Designed for disconnected networks
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| What makes it different | - Complete privacy - chat history stays only on your device and is never sent to servers
- Model picker with real-time availability, not a single locked-in assistant
| - Continual learning architecture that learns in place after deployment, unlike frozen models
- Brain-modeled design with separate organs for memory, sleep, and decision-making
- All learning happens on your device with no data sent to servers
- Works where cloud connectivity is unavailable or undesirable
- Patent-pending learning method usable with other large language models
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| Free plan | Not given
| Not given
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| Open source | Not given
| Not given
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| Platforms | Not given
| Not given
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| Public API | Not given
| Not given
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | Not checked yet ● no change since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 1 | 0 |
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| Citation Flow (Majestic) | 17 | 0 |
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| Referring domains (Majestic) | 5 | 0 |
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3 details filled in for both companies.
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