Best Search API for AI Apps: 4 Web Search APIs vs Google

If you’re building anything that searches the web — an agent, a RAG pipeline, a research tool — you picked a search API. Brave, Tavily, Exa, Perplexity, one of the others. And you almost certainly picked it assuming that what it returns is basically what Google returns. A ranked list of the best pages on the web. Close enough to Google that the distinction doesn’t matter.

That assumption is worth testing, because the entire “AI search” stack rests on it. So we ran the search API comparison nobody publishes: not a feature-checklist table, but a measured one. We took the four most common independent search APIs and ran the same 500 queries — stratified across informational, commercial, transactional, navigational, and local intent — through each of them and through cloro’s live Google SERP, on the same day. Then we scored how much each one actually agrees with Google, on the exact URLs, on the domains, and on the ranking order.

The answer isn’t “yes” or “no.” It’s a spectrum — and where each API sits on it tells you exactly what you’re buying.

The spectrum: from “Google reordered” to “a different web”

Line the four up by how much of Google’s top 10 they reproduce, and they fall into a clean gradient. This is our 500-query search-correlation study — each vendor’s top 10 versus Google’s, on exact URLs and on domains:

Search API	Exact-URL overlap@10	Domain Jaccard	Google-domain recall	Its #1 is Google-ranked	Rank ρ	Dates results	Returns an answer
Tavily	~60%	0.66	80%	78%	0.03	0%	99.6%
Brave	47%	0.45	65%	89%	0.55	63%	0%
Perplexity (Search API)	33%	0.33	49%	72%	0.43	100%	0%
Exa	32%	0.30	44%	68%	0.27	48%	0%

Read left to right and the story is a slide from “Google’s page, rearranged” to “a genuinely different web.” But the single most important thing in that table isn’t any one row — it’s that the two columns disagree. “Google-domain recall” (how many of Google’s domains show up at all) and “rank ρ” (whether they come back in Google’s order) are not the same axis. A vendor can return almost all of Google’s sources in the wrong order, or fewer sources in roughly the right order. That’s the whole shape of the comparison. Here’s each API in its own words.

Tavily — Google’s sources, reordered

Tavily is the most Google-like on sources of anything we tested: its top 10 reproduced about 80% of Google’s top-10 domains and 60% of the exact URLs. If you only looked at which pages come back, you’d call it a near-clone of Google. But its rank correlation with Google was 0.03 — statistically, no relationship at all. Tavily takes essentially Google’s sources and returns them in an order optimized for LLM consumption, not for Google’s ranking. It’s also the only one of the four that hands back a synthesized answer by default (on 99.6% of queries), which is exactly what you want feeding a model and exactly not what you want if you’re trying to see a ranking. If your agent runs on LangChain or LangGraph, this is very likely the web it sees — we unpack the reordering in detail in Tavily vs Google Search.

Brave — Google-adjacent, and in Google’s order

Brave is the one that best preserves Google’s actual ranking: a Spearman correlation of 0.55, and its #1 result was a domain Google also ranks 89% of the time — the highest first-result agreement of the four. It shares fewer of Google’s total domains than Tavily (65% recall), but the ones it returns come back in something close to Google’s order. Brave runs its own independent index of 30-billion-plus pages, and it’s the engine behind Claude’s web search — so a huge share of production “AI search” is quietly Brave search. It also attaches machine-readable dates to 63% of results, which Google’s organic block doesn’t expose. Full breakdown in Brave Search API vs Google.

Perplexity Search API — Google-adjacent, and dated

The Perplexity Search API is not the Perplexity answer engine users know — it’s a raw ranked-results endpoint, and it sits in the middle of the spectrum. It recalled about half of Google’s domains (49%), preserved order moderately well (ρ 0.43), and — its signature — returned a machine-readable date on essentially every result (100%), skewing older (median age ~277 days). It’s neither Google nor the Perplexity you see in the app; the three-way distinction is the whole subject of Perplexity Search API vs Google.

Exa — a different web, by design

Exa is the outlier, and it’s supposed to be. It’s a neural search API: it retrieves by embedding similarity — meaning — rather than keyword-and-link ranking. So it’s the least Google-like of the four (32% URL overlap, 44% domain recall, ρ 0.27), and that’s the point, not a defect. Exa surfaces semantically related pages Google’s ranking would bury, which is a feature for discovery and research and a mismatch if you expected Google’s results. The design tradeoff is the subject of Exa Search vs Google.

What every one of them is missing

Here’s the part that unifies the whole spectrum. For all their differences in how close to Google’s sources they land, the four APIs have one thing in common: none of them returns Google’s actual result page.

Because each API queries its own index or retrieval model rather than scraping Google, it structurally can’t return the Google-specific features that increasingly are the page. On the same 500 queries, Google rendered a People Also Ask block on 77% of them, an AI Overview on 64%, and shopping units on 14%. Brave, Tavily, Exa, and Perplexity return exactly zero of these. They give you organic links — Google’s, reordered, or a neighboring web — and nothing of the answer layer Google wraps around them.

And that layer isn’t a mirror of the organic results, either. When Google generated an AI Overview, the domains it cited overlapped with Google’s own organic top 10 only 51% of the time — so the AI Overview is pulling from sources that even Google’s organic ranking doesn’t fully surface, let alone an independent API. If AI Overview visibility is what you’re tracking, no web search API can see it, because the feature doesn’t exist outside Google’s page.

This is the honest bottom line of the comparison. Every independent search API can tell you, to varying degrees, which pages Google would surface. Not one of them can tell you what Google actually shows.

Pricing: all four APIs vs a Google SERP API

The prices cluster tightly, and — this surprises people — the Google SERP API is the cheapest per query. All figures verified from each vendor’s own pricing page in July 2026:

API	What you get	Price / 1,000	Free tier
cloro (Google SERP)	The real Google page + AI Overview, PAA, shopping, exact order	~$0.93–$1.20	within base plan
Brave	Independent index — Google-adjacent sources, in order	$5	$5 credits/mo
Perplexity (Search API)	Ranked results, every one dated	$5	—
Exa	Neural/embedding retrieval — a different web	$7 (≤10 results)	20,000 req/mo
Tavily	~80% of Google’s sources, reordered, + an answer	~$8 (basic)	1,000 credits/mo
Anthropic (Claude) web search	The Brave index, read & summarized by Claude	$10 + tokens	—

The numbers behind that table: Brave’s pricing is $5 per 1,000 requests; the Perplexity Search API is $5 per 1,000; Exa is $7 per 1,000 for up to 10 results (plus $1/1,000 per extra result) with 20,000 free requests a month; Tavily is $0.008 per credit and a basic search is one credit, so about $8 per 1,000 (advanced searches are two credits); and Claude’s web search is $10 per 1,000 plus token costs — the Brave index with a model wrapper at double Brave’s own price. cloro’s pricing starts at $100/mo for 250,000 credits; a Google Search request is 3 credits, which works out to roughly $0.93–$1.20 per 1,000 queries.

The takeaway isn’t that one price wins — the cheapest option isn’t automatically the best search API for your job. Price barely varies, so it shouldn’t drive the decision; what varies is the output. Pay for the one whose output you actually need.

Which is the best search API for your use case?

The spectrum maps cleanly onto use cases, so the best search API isn’t a single winner — it’s the right tool per job.

• Grounding an LLM or agent, cheapest sources. Any independent API works — this is what they’re built for, so the best search API here is whichever fits your stack. Brave if you want Google-like ordering and dates (and it’s what Claude uses); Tavily if you want a ready-made answer and the widest slice of Google’s sources; Perplexity if you want everything dated.
• Discovery and research — finding pages Google wouldn’t rank. Exa. Its neural retrieval is a feature here, not a gap; it surfaces semantically related work that keyword ranking buries.
• Reproducing or measuring the Google page. A real Google SERP API like cloro. The moment you need the AI Overview, People Also Ask, shopping units, or the exact organic order — for rank tracking, SEO, AI-Overview monitoring, or SERP scraping — no independent index can help, because none of them is scraping Google.
• You conflated the two. The most common, most expensive mistake: choosing a web search API for a job that actually needs the Google page. If you’re tracking rankings or AI Overview visibility on a Tavily or Brave feed, you’re measuring a different web than the one you’re trying to report on.

If you’re weighing SERP-API vendors specifically (the scraper side of this world, rather than AI web-search APIs), that’s a different comparison — see our rundown of the best SERP APIs.

Methodology and caveats

The data is first-party: cloro’s search-correlation harness (internal ticket MAR-124), one run on 2026-07-08.

• Baseline is cloro’s live Google SERP (/v1/monitor/google), organic top 10. Overlap is measured on normalized URLs (host + path) and on registrable domains.
• Same-hour execution. Every vendor leg and the Google baseline ran within the same hour per query, so they’re compared against the same live SERP — not a cached or day-shifted one.
• 500 queries, stratified by intent (informational, commercial, transactional, navigational, local) × category (12 verticals from automotive to travel). The query set is versioned, so re-runs are directly comparable.
• Rank ρ is Spearman correlation on the ranks of domains present in both lists, computed only where at least three domains are shared. A near-zero value (Tavily) means “same sources, unrelated order,” not “different sources.”
• Freshness counts only machine-readable dates a vendor returns. Google’s organic block exposes none, so there’s no Google age column — that’s a real asymmetry between the products, not a hole in the data.
• One snapshot. This is a single point-in-time run. Indexes shift, and a vendor’s numbers can move between runs; treat the spectrum’s shape — the ordering of the four — as the durable finding, not any single decimal.

The one thing to take away

The honest ending to any search API comparison is that “AI search” is not Google search, and it’s not one thing either. So the best search API is the one whose output matches your job: it’s a spectrum, from Tavily returning Google’s sources in its own order, to Exa retrieving a genuinely different web on purpose — with Brave and Perplexity in between. Which one is right depends entirely on whether you want sources (any of them will do) or Google’s ranking (Brave leads) or a different web (Exa, by design).

But every point on that spectrum shares one limit: none of these APIs returns Google’s result page. The AI Overview that now answers most queries before any link, the People Also Ask block on three-quarters of searches, the shopping units, the exact order — that layer lives only on Google’s page, and only a SERP API returns it.

Need the real Google SERP, features intact? See how cloro’s web search API returns it as structured JSON, or check the pricing — it’s often cheaper per query than the web search API you’d have used instead.