The internet lies.
DeepInquiry+ doesn't.
Every fact is cross-checked against multiple sources on different websites, graded on how distinct their sources are, and cryptographically signed — so you can show it has not been altered.
3,043 verified facts · every one signed and cited
Quantum mechanics concepts and methods have been applied to quantum information science.
What you get
Save unlimited facts
Build personal collections. Tag by topic. Export citations in BibTeX, APA, MLA, and Chicago format — ready to drop into any paper or article.
Every fact is signed
Each claim carries a CiteSig signature — a cryptographic receipt of provenance. Copy, share, screenshot: the signature travels with the fact.
Skip the verification queue
Submit a claim for verification and Plus members' submissions run first. Turnaround measured in hours, not days.
Ad-free, no tracking
The public site runs ads to stay free. Plus is 100% ad-free — no banners, no tracking pixels, no third-party scripts on your pages.
Pricing
Annual plans save 30%. Cancel anytime — keep access through the end of your billing period.
Individual
For one researcher, journalist, or curious mind
$9.49 /month
or $79.99/year (save $33.89)
- 1 seat
- Unlimited saves
- Export in 4 citation formats
- Ad-free browsing
- Priority verification queue
Family
Up to 5 people on one billing account
$13.99 /month
or $117.99/year (save $49.89)
- 5 seats
- Everything in Individual
- Family library sharing
- One billing account
Educator / Institution
Classrooms, libraries, small institutions
$229 /year
Annual only. Site license.
- 50 seats
- LMS integration (SSO)
- Classroom collections
- Educator dashboard
Why bother?
The AI hallucination problem is your problem too. Every "quick fact" from a chatbot could be wrong. Every viral tweet could be misleading. Every news headline is optimized for clicks, not truth. DeepInquiry+ is the antidote — a stream of facts, each with its sources, that you can cite.
You get to see the receipts. Every fact links to where it came from. This is the internet as it should have been.
Frequently asked
What if I don't want to pay?
The free tier stays. You can browse the entire corpus without an account. Plus adds personal collections, citation exports, ad-free browsing, and priority verification.
How do you make money?
Plus subscriptions, the developer API, and enterprise data licenses. Ads on the free site cover hosting. No data selling, no tracking.
What's CiteSig?
An open protocol we built for signed factual claims. Every DeepInquiry fact carries one. Learn more at citesig.org.
How is this different from Wikipedia or ChatGPT?
Wikipedia is community-edited and can be wrong or vandalized between checks. ChatGPT can confidently invent citations that don't exist. DeepInquiry cross-checks the claim against sources on different websites, scores the confidence, and signs the result. Facts that do not meet our tier rules are held back for review.
Can I cancel any time?
Yes. Cancel from your account settings. You keep access through the end of your current billing period. No forced yearly plans.
Who's behind this?
DeepInquiry is built in Florida by Machine Accountability Corporation. Every claim is cross-checked against sources on different websites, cited, dated and signed. No advertising, and nothing is ranked by who paid.