Perplexity Spaces vs Gemini Notebook (formerly NotebookLM) vs Tencent ima.copilot 腾讯ima vs ChatGPT Deep Research
A side-by-side look at scores, pricing and features — with RECATOOLS' ASEAN-aware verdict for each.
Perplexity Spaces
Perplexity's shared folders for recurring research projects
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Gemini Notebook (formerly NotebookLM)
Source-grounded research notebook with podcast-style summaries
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Tencent ima.copilot 腾讯ima
Tencent's research-notebook AI assistant
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ChatGPT Deep Research
OpenAI's cited, multi-step research agent inside ChatGPT
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| RECATOOLS Score | 7.2 / 10 | 8.3 / 10 | 6.1 / 10 | 7.8 / 10 |
| Capability | ||||
| Value for money | ||||
| Ease of use | ||||
| ASEAN readiness | ||||
| API quality | ||||
| Pricing | Subscription | Freemium | Free | Subscription |
| Free tier | — | — | — | — |
| Paid from | — | Free (Standard) tier; paid access bundled into Google AI subscriptions — Plus ~$7.99/mo | — | — |
| Has API | ✗ | ✗ | ✗ | ✗ |
| Open source | ✗ | ✗ | ✗ | ✗ |
| Free to use | ✗ | ✓ | ✓ | ✗ |
| Users | — | Reported in the millions of monthly active users in 2026 | — | — |
| Founded | 2024 | 2023 | 2024 | 2025 |
| Maker | — | — | — | — |
| Verdict | Spaces solve a real problem with chat-based research tools: without them, every Perplexity thread is an island, and repeating context for a running project gets old fast. A Space bundles the threads, uploaded files (up t... |
NotebookLM has a genuinely distinct shape among AI tools: it answers from the sources you upload, with inline citations, which keeps hallucination noticeably lower than open-ended chatbots. Audio Overviews — two AI hosts... |
ima.copilot is Tencent's AI knowledge-management workbench, powered by Hunyuan and DeepSeek, that combines web-wide search, document parsing, RAG-based Q&A over a personal knowledge base, and content generation into... |
Deep Research is the most consequential agent mode ChatGPT ships: point it at a genuinely open-ended question and it will spend anywhere from 5 to 30 minutes autonomously browsing, reading, and cross-checking dozens of s... |
| Full review → | Full review → | Full review → | Full review → |
Comparisons cover up to 4 tools. Scores are RECATOOLS editorial assessments; verify current pricing on each vendor's site.