Search academic papers in your language.
AI analyzes relevance for you.
Tired of AI suggesting papers that don't exist?
General-purpose AI can fabricate non-existent papers. Litra.ai queries the OpenAlex academic database directly, returning only papers that actually exist. No hallucinated references — ever.
Want to search for papers in your own language?
Just type in your own language. AI understands the meaning behind your query and finds relevant papers from a database of 280 million. Currently available in Japanese, with more languages coming soon.
Want to see how papers relate to each other and track research trends visually?
Automatically analyzes publication trends and year distributions from search results. Visualize citation sources and follow-up studies in a tree diagram to trace the flow of research.
Search papers from your AI agentUnder Development
Use Litra.ai's paper search directly from AI tools like Claude Code, Cursor, and Windsurf. Just configure the MCP server and search papers within your AI conversations.
Supported Clients
{
"mcpServers": {
"litra": {
"command": "npx",
"args": [
"-y",
"@anthropic-ai/mcp-remote",
"https://litra-ai.com/api/v1/mcp"
],
"env": {
"API_KEY": "YOUR_API_KEY"
}
}
}
}Simple, transparent pricing
Start free, upgrade when you're ready
- ~3 searches included
- Save up to 3 results
- Paper PDF analysis※1
- No credit card required
- GPT-4.1 mini only
- 1 device login
- API / MCP access: Not available
- 30 credits per month
- Unused credits roll over (up to 60)
- Save up to 10 results
- All AI models available
- 2 device logins
- API / MCP access (10 req/min)
- 100 credits per month
- Unused credits roll over (up to 200)
- Save up to 50 results
- Paper PDF analysis※1
- All AI models available
- 3 device logins
- API / MCP access (30 req/min)
- 400 credits per month
- Unused credits roll over (up to 800)
- Save up to 200 results
- Paper PDF analysis※1
- All AI models available
- For research labs (4-10 members)
- Sub-accounts (up to 20)※2
- Up to 20 users
- API / MCP access (60 req/min)
- 1200 credits per month
- Unused credits roll over (up to 2400)
- Save up to 500 results
- Paper PDF analysis※1
- All AI models available
- For large research labs (~100 members)
- Sub-accounts (up to 100)※2
- Priority support
- Up to 100 users
- API / MCP access (120 req/min)
※1 Paper PDF (full-text) analysis is under development in Beta
※2 Sub-account feature is under development in Beta
※ Multilingual translation currently supports Japanese only in Beta
Frequently Asked Questions
Litra.ai queries the OpenAlex academic database directly to retrieve papers. Unlike ChatGPT, which generates text, we fetch search results directly from real paper databases — so fabricated papers are never suggested. We also run link verification on every reference to confirm each paper exists.
Hybrid search combines keyword search with semantic search. Keyword search, like Google Scholar, matches exact terms, while semantic search finds papers with similar meaning or concepts. For example, a search for 'crop monitoring' would also discover papers about 'agricultural field observation' or 'farmland surveillance.' Litra.ai merges both approaches so you never miss relevant papers.
The free tier gives you 3 credits (approximately 3 searches). GPT-4.1 mini is available. You can try the same features as paid plans — multilingual translation, AI analysis chat, and paper analysis. No credit card required.
Credits are the currency used to search papers on Litra.ai. Different AI models consume different amounts (GPT-4.1 mini: ~1 credit, Haiku 4.5: ~3 credits, Sonnet 4.5: ~9 credits per search).
For individual use: Mini ($9/mo, 30 credits) for occasional use, Standard ($19/mo, 100 credits) for regular use, or Pro ($69/mo, 400 credits) for heavy use. For research labs: Pro for 4-10 members, Max ($199/mo, 1200 credits) for larger groups up to 100.
For Individual Use
- Occasional use (5-10 times/month): Mini ($9/mo, 30 credits) is recommended. Great for light literature searches and report writing.
- Regular use (2-3 times/week): Standard ($19/mo, 100 credits) is recommended. Ideal for regular paper checks and research activities.
- Daily / heavy use (10+ times/week): Consider Pro ($69/mo, 400 credits). Perfect for frequent Sonnet 4.5 usage (9 credits/search) or PhD literature review periods.
For Research Labs
- Small labs (4-10 members): Pro ($69/mo, 400 credits) is recommended. Sub-account feature (up to 20 members) lets lab members share credits.
- Large labs (up to 100 members): Max ($199/mo, 1200 credits) is recommended. Comes with sub-accounts (up to 100 members) and priority support.
Key Differences Between Plans
Mini vs Standard:
- Credits: 30 vs 100
- Paper PDF analysis (in Beta development): No vs Yes
- Login devices: 2 vs 3
Pro vs Max:
- Credits: 400 vs 1200
- Recommended size: 4-10 vs up to 100
- Sub-accounts: up to 20 vs up to 100
- Priority support: No vs Yes
Yes, unused credits roll over to the next month. The maximum balance is capped at 2x your monthly credits. For example, on the Standard plan (100 credits/month), you can hold up to 200 credits including carried-over amounts.
We accept credit cards (Visa, Mastercard, American Express, JCB). All transactions are securely processed through Stripe.
Yes. We support reimbursement-based payment for KAKENHI. After paying by credit card, a receipt is automatically issued that you can submit to your university's accounting department. The receipt does not include a company seal (inkan), but this is legally fine. If your university requires a seal, please contact us and we'll accommodate. Bank transfer (invoiced payments) is planned for the future.
Yes, you can cancel at any time. After cancellation, you can continue using the service until the end of your current billing period.
If you purchased an annual plan within the last 14 days, you can request a refund from your account page. The refund amount is prorated based on unused credits (refund = payment × remaining credits ÷ total credits). Monthly plans do not offer prorated refunds, but you can continue using the service until the end of the billing period. A processing fee (3.6%) may be deducted from refunds.
We do not offer a dedicated enterprise plan. For research lab use, we recommend Pro ($69/mo, 400 credits) or Max ($199/mo, 1200 credits). If Max is insufficient, you can purchase multiple Max subscriptions.
Get started for free
Try approximately 3 searches for free. No credit card needed.