20+ Best Alternatives to Onyx in 2026
Looking for an alternative to Onyx? Below are 20 AI startups working in the same space — ranked by our Neuron score so the most credible options come first. Each card shows what makes the tool a viable substitute, pricing signals, and funding stage.
- 1View alternative →
Vespa.ai
$31MBig-data serving engine for vector and lexical search
Why it's similar: Shares categories with Onyx — AI Search.
💵 Free
- 2View alternative →
Perplexity
$2.0BAI-powered answer engine delivering real-time, cited responses to complex queries.
Why it's similar: Shares categories with Onyx — AI Search.
💵 Free
- 3View alternative →
Parallel
$230MWeb search and research API purpose-built for AI agents
Why it's similar: Shares categories with Onyx — AI Search.
💵 Free trial
- 4View alternative →
Profound
$151MAI search visibility platform for Answer Engine Optimization across ChatGPT and Perplexity
Why it's similar: Shares categories with Onyx — AI Search.
💵 Free
- 5View alternative →
Turbopuffer
$10MObject-storage-native vector and full-text search at massive scale
Why it's similar: Shares categories with Onyx — AI Search.
💵 Free trial
- 6View alternative →
Coactive AI
$44MMultimodal AI that makes video and images searchable
Why it's similar: Shares categories with Onyx — AI Search.
💵 Free
- 7View alternative →
Bluefish
$68MAgentic marketing platform to influence how brands appear in AI
Why it's similar: Shares categories with Onyx — AI Search.
💵 Free
- 9View alternative →
AI Hay
$18MAI-powered knowledge discovery and Q&A platform for Vietnamese users
Why it's similar: Shares categories with Onyx — AI Search.
💵 Free
- 10View alternative →
Nimble
$75MAI agents that search the web and turn results into queryable data tables
Why it's similar: Shares categories with Onyx — AI Search.
💵 Free
- 11View alternative →
OpenEvidence
$735MAI medical assistant for clinicians
Why it's similar: Shares categories with Onyx — AI Search.
💵 Free
- 14View alternative →
Memories.ai
$8MVisual memory model for understanding long videos
Why it's similar: Shares categories with Onyx — AI Search.
💵 Free
- 15View alternative →
Vuelo
$7.6MAI-native travel booking and payments platform
Why it's similar: Shares categories with Onyx — AI Search.
💵 Free
- 16View alternative →
Airial
$3MAI travel concierge that plans every detail of your trip
Why it's similar: Shares categories with Onyx — AI Search.
💵 Free
- 17View alternative →
You.com
$175MThe productivity search engine with AI agents.
Why it's similar: Shares categories with Onyx — AI Search.
💵 Free trial · From $15/mo
- 18View alternative →
Glean
$750MWork AI for the entire enterprise
Why it's similar: Shares categories with Onyx — AI Search.
💵 Enterprise · Contact sales
- 19View alternative →
Geostar
UndisclosedGenerative engine optimization to win AI search visibility
Why it's similar: Shares categories with Onyx — AI Search.
💵 Free
- 20View alternative →
Exa
$102MSearch for AI applications
Why it's similar: Shares categories with Onyx — AI Search.
💵 Free
Frequently asked questions
What are the best alternatives to Onyx?
The top-ranked alternatives to Onyx on NeuronFeed are Vespa.ai, Perplexity, Parallel, Profound, Turbopuffer. Rankings are based on our Neuron score, which weighs funding, momentum and editorial signal.
Is there a free alternative to Onyx?
Yes — Vespa.ai, Perplexity, Profound offer a free plans. See the pricing column for each alternative above.
How is this list ranked?
We rank alternatives by shared categories with Onyx, then by our proprietary Neuron score (0–100) which combines funding, team quality, momentum, and editorial input. The list refreshes every 30 days.
Onyx vs Vespa.ai — which is better?
It depends on use case. Vespa.ai (Big-data serving engine for vector and lexical search) is the #1-ranked alternative. See the full side-by-side at /compare/onyx-vs-vespa-ai.
Explore more around Onyx
Contextual paths to related AI startups, deals and rankings.