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2 / 4 Tools
| Attribute | ChatGPT by OpenAI | Heptabase by Heptabase, Inc. |
|---|---|---|
| Category | AI Chat Subcategory: Conversational Assistant | Research Subcategory: Visual PKM & Research Canvas |
| Rating & Reviews | ★New / 5.0 0 verified reviews Weighted score: 0.00 | ★New / 5.0 0 verified reviews Weighted score: 0.00 |
| Pricing Model | freemium | paid |
| Starting Price | $20/mo Free tier with GPT-4o mini; Plus subscription at $20/month for frontier reasoning and priority features. | 8.99 Subscription-only with a 7-day free trial. Pricing starts at approximately $8.99/month (annual billing) or $11.99/month (monthly billing). No perpetual free plan. |
| Platforms | WebiOSAndroidmacOSWindows | macOSWindowsLinuxiOSAndroidWeb |
| AI Capabilities | Natural Language UnderstandingComplex ReasoningVoice InteractionCode GenerationDocument Analysis | Semantic card searchVisual mind mappingPDF text annotationLocal-first data management |
| Overview | OpenAI conversational assistant featuring GPT-4o, reasoning models o1 & o3-mini, Advanced Voice mode, and deep canvas workspace. | Visual knowledge management workspace that combines nested whiteboards, markdown cards, and PDF annotations for complex research. |
| Tags | chatassistantopenaiproductivitymultimodal | pkmknowledge-managementwhiteboardresearchmarkdown |
