Free plans (7)
Their limits are stated in different terms, so they aren't ranked against each other. Ordered by first paid price.
| Tool | Stated limits | What makes you upgrade | First paid price | Kind |
|---|---|---|---|---|
 SlabRead Oct 29, 2026 |
Free plan for up to 10 users with 10MB attachments, 90 days version history and 10 standard integrations; free forever."Yes! Slab is free to for up to 10 users + guests forever."Source | Startup has no cap on use | $8/userStartup | Free plan |
 Slack AI SearchRead Oct 29, 2026 |
Free forever plan with 90 days of message history, up to 10 apps, 1:1 meetings and basic AI. Upgrade to access older messages."Messages are saved and searchable for 90 days. Upgrade to access the previous 12 months messages."Source | Upgrade to access older messages | $8.75/userPro | Free plan |
 NotionRead Oct 29, 2026 |
Free plan at $0 per member/month with a trial of Notion AI, basic forms and sites, Notion Calendar and databases. Pages and blocks are limited for workspaces with 2+ members."For individuals to organize personal projects and life."Source | Not found | $12/userPlus | Free plan |
 AlgoliaRead Oct 29, 2026 |
Free plan with 10K search requests/month, 50K records, 5K recommendation requests/month and 5K crawls/month; no credit card required. Upgrade to Grow or Grow Plus for higher limits."No credit card required."Source | Upgrade to Grow or Grow Plus for higher limits | No price found | Free plan |
 Brave Search APIRead Oct 29, 2026 |
Includes $5 in free credits every month on Search, Answers, Spellcheck and Autosuggest, applied automatically; usage beyond that draws down prepaid credits."Includes free $5 in credits every month."Source | Usage beyond that draws down prepaid credits | $5/1,000 requests | Free plan |
 Google Cloud Search / Vertex AI SearchRead Oct 29, 2026 |
10,000 queries per account per month at no cost on General pricing (excludes Advanced Generative Answers); 10 GiB index storage free per month"Free Trial: You'll have access to 10,000 queries per account, per month at no cost to explore Agent Search without an initial investment."Source | Not found | $1.50/1,000 query | Free plan |
 You.comRead Oct 29, 2026 |
Free MCP access to Web Search with up to 100 queries a day, no API key, account or credit card needed"Live search through the MCP server, no API key—up to 100 queries a day."Source | Free MCP access to Web Search with up to 100 queries a day, no API key, account or credit card needed | $5/1k calls | Free plan |
Free trial only (6)
- Coveo: Free trial offered (length not stated)
- Dashworks: 14 day free trial, no credit card required
- Elastic: Free trial available, no credit card required (length not stated)
- Onyx: 14-day free trial, no credit card required
- SearchBlox SearchAI: 30-day fully functional free trial
- Slite: 14-day free trial, no credit card required, covers Basic and Pro features
Questions
Which AI search engines are free?
7 have a free plan you can keep, including Algolia, Brave Search API, Google Cloud Search / Vertex AI Search, Notion, Slab, Slack AI Search.
What do you pay after a free plan?
The lowest first paid price among tools with a free plan is $8/user (Slab). Read from each vendor's own page.
How this page is made
Every limit is the vendor's own, read from its pages and quoted. A tool counts as a free plan when the text describes something you can keep using; a fixed number of days or a single batch of credits is listed separately. We don't test the plans. How prices are read.