Consensus, SciSpace and Phở Chat all answer research questions with citations, but they are built around different jobs. Consensus is built around search across a very large index. SciSpace is built around reading and writing with papers. Phở Chat is built around getting from a question to a file you can hand in: cited answers, screening and exportable tables.
Last checked: 2026-10-29. Competitor facts below come from each vendor’s own pages, listed under Sources.
At a glance
| Consensus | SciSpace | Phở Chat | |
|---|---|---|---|
| Built around | Search and synthesis over a large index | Reading, chat with PDF, writing help | Cited answers, screening, verified lists, export |
| Paper coverage (vendor figures) | 400M scholarly articles, 350M peer-reviewed [1] | 280M papers, 50M full-text PDFs [2] | PubMed, OpenAlex, arXiv, Europe PMC, ClinicalTrials.gov, searched live |
| Deep research mode | Deep Review reads 50 to 100 papers [1] | Deep Review across millions of papers [2] | Deep Research report that states how it was made |
| Checking sources against claims | Not checked | Citation Verifier flags weak or mismatched evidence [2] | Cite-or-abstain: a claim without a real source is labelled unverified |
| Systematic review screening | Not a screening tool | Not a screening tool | AI title and abstract screening, 60 records per run, reason per verdict |
| Export | Not checked | Not checked | Word, RIS, CSV |
| Bring your own API key | No mention found | No mention found | OpenAI, Anthropic, Google, DeepSeek, xAI, OpenRouter, no markup |
| Free plan | Yes, with monthly limits [1] | Free tier for chat with PDF [2] | Yes |
| Paid price | Pro $20/month or $144/year; Deep $65/month or $540/year [1] | No public price we could verify [2] | Pro $10/month or $99/year (your own model key) |
Consensus: search first, then answer
Consensus says it scans its whole index with hybrid keyword and semantic search, ranks papers the way a researcher would weigh them, refines the top 20 with a larger model, and only then writes an answer. A Pro search reads up to 20 papers. A Deep Review runs up to 20 searches in parallel and reads 50 to 100 papers. [1]
Its paper data comes from Semantic Scholar, OpenAlex, its own crawl and publisher partnerships, and it offers a curated medical mode. [1]
Where Consensus is stronger than Phở Chat: index size, and a polished one-question answer flow for everyday research questions.
SciSpace: read and write with papers
SciSpace’s literature review tool searches 280 million papers and puts findings in tables with custom columns. Its chat-with-PDF feature answers from specific sections of an uploaded PDF, explains highlighted text and supports more than 75 languages. It also offers writing help such as paraphrasing. In October 2026 SciSpace added a Citation Verifier that checks whether your sources actually support your claims and flags weak or mismatched evidence before you submit, and made agent usage unlimited on its Advanced and Max plans. [2]
Where SciSpace is stronger than Phở Chat: in-PDF reading and annotation, and writing assistance across many languages.
Phở Chat: from question to a file you can use
Phở Chat answers from sources it has in hand. Each claim links to a real PubMed or DOI source, and a claim the sources do not support is labelled unverified instead of being given an invented citation.
Past the answer, three things the other two do not focus on:
- Screening. Run AI title and abstract screening on up to 60 records. When the AI is unsure, the record stays undecided for you instead of being excluded, and every verdict carries a reason tied to your criteria. Export to Word or RIS.
- Verified lists. Describe a list (“SaaS companies in Germany with 50 to 200 employees”) and Phở checks every row against your criteria, links each cell to its source, shows rejected rows with the reason, and exports CSV.
- Your own keys. Use your OpenAI, Anthropic, Google, DeepSeek, xAI or OpenRouter key and pay the provider directly, with no markup.
The Free plan costs nothing; Pro, which runs on your own model key, is $10 per month or $99 per year.
Where Phở Chat is weaker: it searches fewer sources than Consensus’s index, and its screening runs are sized for a focused question, not a 5,000-record review.
Which one to pick
- Quick, cited answers from the biggest index: Consensus.
- Reading, annotating and writing around your own PDFs: SciSpace.
- A deliverable at the end, such as a screening log, a verified table or a cited answer you can export: Phở Chat.
Two-way comparisons with more detail: Phở Chat vs Consensus and Phở Chat vs SciSpace. Looking beyond these three? See Elicit alternatives in 2026.
Try it: build a verified list or run a screening pass at pho.chat. It is free to start.
Sources
- Consensus, Subscription plans. https://help.consensus.app/en/articles/10087865-subscription-plans ; Where papers come from. https://docs.consensus.app/get-started/where-papers-come-from ; Research database. https://help.consensus.app/en/articles/10055108-consensus-research-database ; How search works. https://docs.consensus.app/get-started/how-search-works ; Deep Review. https://docs.consensus.app/core-features/deep-search (checked 2026-10-29)
- SciSpace, Literature review. https://scispace.com/literature-review ; Chat with PDF. https://scispace.com/chat-pdf ; Search. https://scispace.com/search ; AI research agent guide. https://scispace.com/guides/scispace-ai-research-super-agent ; Pricing. https://scispace.com/pricing ; Citation Verifier (7 October 2026). https://scispace.com/guides/introducing-scispace-citation-verifier-do-your-sources-support-your-claims ; Unlimited agent usage (9 October 2026). https://scispace.com/guides/introducing-unlimited-agent-usage-on-scispace (checked 2026-10-29)