Perplexity offers two distinct ways to organize your research: Spaces and Threads. Many users confuse these features or use them interchangeably, which leads to duplicated work and lost context. This article explains the core differences between Perplexity Spaces and Threads, including their purposes, storage behavior, sharing capabilities, and ideal use cases. By the end, you will know exactly when to use each feature and how they complement one another.
Key Takeaways: Perplexity Spaces vs Threads
- Spaces are persistent, shared knowledge bases: Store multiple files, set a custom AI focus, and collaborate with team members on a single topic.
- Threads are temporary, individual conversations: Each thread contains a single Q&A session that disappears unless you manually save it to a Space.
- Sharing differs fundamentally: Spaces can be made public or shared with specific users; threads can only be shared as a read-only link.
Spaces and Threads: Purpose and Core Differences
Perplexity Spaces and Threads serve different functions in the research workflow. A Thread is a single conversational session where you ask questions and receive answers. Each thread starts fresh, and the AI only remembers the current conversation unless you explicitly instruct it to recall earlier context. Threads are ideal for quick fact-checking, one-off questions, or exploring a topic without committing to a long-term project.
A Space, by contrast, is a persistent container that can hold multiple files, notes, and related threads. You can set a default AI focus for the Space, such as Academic or Writing, and upload reference documents like PDFs or Word files. The AI then uses those documents as context for every question asked within the Space. Spaces are designed for ongoing research projects, team collaboration, and building a knowledge base around a specific subject.
Storage and Persistence
Threads are not saved automatically. If you close a thread without saving it to a Space, its history is lost. You can view recent threads in your history, but this list is limited and older threads are removed. Spaces, on the other hand, are saved indefinitely. Every file uploaded, every note written, and every question asked within a Space remains accessible until you delete the Space.
AI Focus and Custom Instructions
Each Space allows you to set a default AI focus: Web, Academic, Writing, Math, or Video. You can also add custom instructions that the AI follows for all queries in that Space. For example, you can tell the AI to always cite sources from the last two years or to answer in bullet points. Threads do not support persistent custom instructions. You must set the focus manually for each question, and any instructions you type apply only to that single query.
Collaboration and Sharing
Spaces support collaboration. You can invite other Perplexity users to view or edit a Space. Each collaborator sees the same files, notes, and thread history. Threads cannot be shared for collaboration. You can generate a public link for a thread, but anyone with the link can only read the conversation. They cannot add questions or modify the thread.
When to Use a Thread vs a Space
Use a Thread when you need a quick answer and do not plan to revisit the research. Examples include checking a fact, asking for a definition, or comparing two products. Threads are also useful for testing different prompts or AI focuses without affecting a larger project.
Use a Space when you are working on a multi-step research project, writing a report, or collaborating with a team. A Space keeps all related files, notes, and conversations in one place. If you find yourself repeating the same question or referencing the same document across multiple threads, you should create a Space.
Common Misconceptions and Limitations
Can I Convert a Thread Into a Space?
No, you cannot directly convert a thread into a Space. However, you can save a thread to an existing Space. Open the thread, click the three-dot menu, and select Add to Space. The thread becomes a conversation within that Space. Its content remains readable, but the thread is no longer independent.
Do Spaces Count Toward My Search Limit?
Yes. Every question you ask inside a Space consumes one search credit from your daily limit, just like a thread. The Pro plan offers 600 Pro searches per day, while the Free plan offers 5 searches every 4 hours. The number of Spaces you create does not affect these limits.
Can I Set a Default AI Focus for All My Threads?
No. The default AI focus applies only to Spaces. For threads, you must select the focus each time you start a new conversation. You can change the focus mid-thread, but the AI will not remember the previous setting.
| Item | Spaces | Threads |
|---|---|---|
| Purpose | Persistent knowledge base for long-term projects | Temporary Q&A session for quick answers |
| Storage | Saved indefinitely; supports files, notes, and conversations | Not saved; history limited to recent threads |
| AI Focus | Set a default focus and custom instructions | Must set focus per query; no persistent instructions |
| Collaboration | Invite multiple users to view or edit | Not collaborative; read-only link sharing only |
| Ideal Use Case | Research projects, team collaboration, document analysis | Fact-checking, one-off questions, testing prompts |
Spaces and Threads are not competitors but complementary tools. Use threads for speed and exploration. Use Spaces for organization and collaboration. The most effective workflow involves starting with a thread to test an idea, then saving the thread to a Space once the topic becomes a project. This approach keeps your research organized and your search credits focused on what matters.