Pulse Brain Search · Free to search · Pay-as-you-go reports

Ask Pulse Brain

Ask a question in plain English and get the strongest studies from 20,000+ curated records on soil, food and health — each graded T1–T4. Searching is free; your first AI evidence report is on us, then reports are pay-as-you-go. Pricing →

01 · Hot topics this week

Last 7 days Hot Topics

A live, weekly-refreshed list of the topics with the most new evidence in the catalogue. Click any number to run that search instantly.

  1. Loading hot topics…

Quick research shortcuts
Click any tile to run that search instantly — your filters above update to match.
03 · Reading the results

What every element means

Every result card carries four pieces of information. Here's how to read them and why they matter.

🏷
Tier badge (left)
Methodological strength of the study, rated 1–4. Tier 1 is the gold standard.
Tier 1
Meta-analysis / systematic review
Tier 2
RCT or prospective cohort
Tier 3
Observational / cross-sectional
Tier 4
Expert opinion / narrative review
◉
Pulse Score (right)
A 0–100 composite quality metric. Combines evidence tier, sample size, recency, and replication. Higher = stronger, better-replicated evidence.
87
80–100 — highly replicated, recent, top-tier
64
60–79 — solid evidence, some gaps
41
40–59 — emerging or limited replication
📄
Citation line
Author(s) · Journal · Year · DOI — the provenance of the claim. Open navigates to the full record. Cite copies an APA-format reference to your clipboard.
⚙
Filters & what they do
Tier — restricts to one evidence tier.
Study type — values come live from the API's facets endpoint.
Geography — region scope: uk, uk-eu or usa (server-side regex over geography fields).
Score ≥ — client-side threshold hiding weaker records.
Sort — relevance (default for semantic), tier, recency, or title.
Anatomy of a single result card
Tier 1 ① Evidence tier
Regenerative agriculture improves soil organic carbon and crop nutritional quality — meta-analysis of 180 studies ② Claim / title
Smith et al · Nature Food · 2023 · DOI 10.1038/s43016-023-XXXX ③ Citation
Open· Cite· Add to brief ④ Actions
87pulse
⑤ Pulse
Score
04 · Live console

The raw API — request, response, headers

Click any example query above to populate this console. Copy the curl command to run the same call from your terminal. Check Headers for rate-limit state — the X-RateLimit-Remaining header tells you how many requests you have left in this minute.

Request

GET /api/v1/evidence

Run an example query above to generate the curl command…
Method
GET — read-only, no body
Auth
None required · X-API-Key for higher tiers
Format
application/json
CORS
* open — call directly from the browser
Response

Live data from the catalogue

Run an example query above to see results here.
No request yet.
No request yet.
Pricing

Search free. Pay only for reports.

Searching and reading results needs no account. Your first AI evidence report is free with a work email. After that, each report uses one token — £10 for one, £42.50 for 5 or £49 for 10, all + VAT. Tokens never expire and also work for Pulse Claims Check.

Get my free report Buy report tokens Developers: the API
Questions

About Pulse Brain Search

What is Pulse Brain Search?

Pulse Brain Search is Vitagri's public search over the Pulse Brain evidence catalogue — 20,000+ curated records on soil health, nutrient density, regenerative agriculture, food systems and human health. Ask a question in plain English and it returns the most relevant studies, each graded by strength of evidence.

Is Pulse Brain Search free?

Yes. Searching, filtering and reading the study results is free and needs no account. Only AI-written evidence reports are paid: your first report is free when you sign up with a work email, then each report uses one token.

How much does a Pulse Brain report cost?

After the free first report, reports are pay-as-you-go: £10 for one report, £42.50 for 5 or £49 for 10, all plus VAT. Tokens never expire and work for both Pulse Brain reports and Pulse Claims Check.

What do the evidence tiers T1 to T4 mean?

Every study is graded by design. T1 is a systematic review or meta-analysis, T2 a randomised controlled trial or prospective cohort, T3 an observational, field or cross-sectional study, and T4 expert opinion or a narrative review. Higher tiers carry more weight.

Where does the evidence come from?

The catalogue is built from peer-reviewed research and grey literature, enriched with summaries, claims, citation counts and retraction checks, and refreshed continuously. Every result links to its source paper or DOI so you can check it.

Is there an API?

Yes. The same catalogue is available through the Pulse Brain Evidence API at /evidence/api/ — anonymous use is rate-limited, and a free Researcher key raises the limit.