Test an idea against the AI literature. Or combine several into a better one.
AIEng is a research platform for AI engineers. It has read tens of thousands of AI and machine-learning papers from arXiv into a knowledge graph of methods, datasets, results and claims. Ask it whether an idea has been done, or give it several ideas and get one combined proposal. Every finding links to the passage it came from.
5 searches a month, free. No card needed.
Two things to do with it.
Both run on the same graph, and both end in a report you can check line by line.
Check an idea
Describe one idea. You get a verdict (novel, partially explored or already done), the closest prior work, evidence for and against, and the gaps nobody has covered yet.
Combine ideas
Give two to five ideas: your own, ones from papers, or earlier reports. You get one combined proposal, what each idea contributes, where they conflict, whether anyone has already combined them, and the experiments to run first.
How a search works
One search is one idea checked, or one set of ideas combined, by an agent over a few minutes. You can watch each step it takes.
1. Describe the idea, or several
A sentence or a paragraph each, in your own words. No keywords or query syntax.
2. The agent gathers evidence
It searches passages by meaning and by exact terms, follows methods, datasets and citations through the graph, and tags what it finds as supporting, contradicting, prior art or a gap.
3. You get a cited report
A verdict, the evidence behind it, open gaps and suggested refinements; for a combination, the proposal and how the parts fit. It can only cite passages it actually retrieved, and the verdict has to agree with the prior art it found.
More than a search box.
The same graph that answers your idea is open for you to read, browse and connect to your own tools.
Reports you can check
Each finding opens the paper and the passage behind it. Reports are saved to your account and export as Markdown.
Papers, methods and datasets, linked
Browse the corpus by category and date, read a paper section by section with its extracted claims, and see which papers share a method, dataset, task or metric.
What changed between versions
When a paper is revised on arXiv, see the sections, methods and claims that were added or removed.
Works from your editor
An MCP connector lets Claude Code, Claude Desktop or Cursor search the same corpus and start investigations.
Run on our own machines
The models that read the papers and investigate your idea run on Check AI hardware. Your ideas are not sent to an outside AI provider.
Pay for the searches you run.
One search is one check of an idea or one combination of several. Browsing papers and the graph is not counted, and a search that fails is not charged.
Free
For trying it on a real idea.
- 5 searches every month
- Full reports with citations
- Paper browser, graph explorer and MCP connector
- Unused free searches do not carry over
$0
Create a free accountProfessional
For when five a month is not enough.
- Everything in Free, including the 5 free searches each month
- Buy searches with PayPal when you need them; no subscription
- 25 searches for $10 ($0.40 each)
- 100 searches for $25 ($0.25 each)
- 250 searches for $49 ($0.20 each)
- One credit is one search, and credits never expire
From $10 for 25 searches
Start free, add credits laterQuestions
Which papers does it cover?
arXiv papers in the AI and machine-learning categories, with new submissions added every night. It does not cover every venue, blog or code repository, so read "novel" as "not found in this corpus", not as a guarantee.
What counts as a search?
One idea checked, or one set of ideas combined, ending in a report. Opening a saved report again is free.
How does combining ideas work?
The agent searches the corpus for each idea and for papers that use them together, follows the methods and datasets that connect them, and then writes one proposal from that evidence. If the ideas do not fit together, or someone has already combined them, the report says so.
Do credits expire?
Purchased credits do not expire. The 5 free searches reset on the first of each month and are used before your credits.
Can I get a refund?
Yes, within 14 days of buying a pack: in full if you have not used it, or for the unused part if you have. A search that fails is never charged. See the refund policy.
Who can see my ideas?
Only your account, and the people who run the service at Check AI. Other users cannot see your ideas or reports.
Can I check the citations?
Yes. Each finding links to its paper and shows the passage it was taken from. Citations the model made up are removed before you see the report.
Bring your next idea, or your next three.
Create an account, describe the idea, and read the report in a few minutes.