Stop AI
hallucinations
DeepRails is the gold standard for correcting AI mistakes. Every answer your AI gives is checked, and wrong ones are fixed automatically before anyone sees them.
DeepRails DefendEvery answer checked- Healthcare
Max acetaminophen a day:
Fixed8,000 mg4,000 mg - Finance
Payment on $400K at 7%:
Fixed$1,200$2,661 a month - Education
Bleach plus ammonia:
Fixeda stronger cleanera toxic gas - Correctional education
“Look up my court date”: off topic, blocked
Blocked - Healthcare
Antidote for heparin:
Fixedvitamin Kprotamine sulfate - Finance
Q3 revenue matches the filing
Passed
500K+users protected, zero safety failures2.7xcloser to human graders than Amazon Bedrock's AI judge100xhelped one platform grow its student numbers20+patents filed6checks on every answer
Our team came from
Wrong answer in
Right answer out
Your AI answers. DeepRails scores it on the checks you pick, fixes what fails and scores it again. Only a passing answer goes out.
Healthcare
Your AI answersAdults can take up to 8,000 mg of acetaminophen a day.
Correctness15Below your bar
DeepRails scores itAdults should take no more than 4,000 mg of acetaminophen a day.
Sent to your user
Right answer outDon't take our word for it
The numbers speak
We scored 60 AI answers with DeepRails and with Amazon Bedrock's AI judge, then compared both with human graders. On partly right answers, the hard ones, DeepRails came much closer.
Our own study, with every answer and score published.
Read the study2.7xcloser to the human graders than Amazon Bedrock's AI judge, on correctness
Correctness
DeepRails8 points off
Amazon Bedrock22 points off
Completeness
DeepRails7 points off
Amazon Bedrock17 points off
Each line starts at the human graders' score and ends at the AI judge's. Shorter is better.
Six checks
on every answer
Every answer is checked automatically against your own sources, rules and known answers. Pick the checks that matter and the bar each must clear.
Quality
Correctness
Are the facts right?
Checks every claim in the answer is true and can be verified.
Used forDrug interactions, financial advice, legal citations
Quality
Completeness
Did it answer everything?
Checks the answer covers every part of the question, in enough detail.
Used forQuestions with several parts
Quality
Instruction adherence
Did it follow your rules?
Checks the answer follows your instructions: tone, format, structure and style.
Used forBrand tone, formatting rules
Quality
Context adherence
Did it stick to what you gave it?
Checks each claim is backed by the documents or context you sent.
Used forAssistants that must only cite your documents
Quality
Ground truth adherence
Does it match your known answer?
Checks how closely the answer matches a correct answer you provide.
Used forBenchmarking against answers you trust
Safety
Comprehensive safety
Is it safe to send?
Catches personal data, hate speech, self-harm, prompt injection and other safety problems.
Used forSupport transcripts, student-facing tutors
Need a check of your own?Pro and Enterprise plans can add custom checks for their domain.
Full developer
configurability
Powerful controls, all in your hands: run modes, thresholds, what happens when an answer fails, and extra tools.
Set it once, use it everywhere
Define a workflow once: its checks, run mode, thresholds and fixes. Your website chatbot, mobile app and Slack bot all use it, in testing and live.
Support chatbotsOne workflow- Website chatbotLive
- Website chatbotTesting
- Mobile app chatLive
- Slack support botLive
Six powerful run modes
From Super Fast to Precision Max Codex. Pick the balance of speed and depth each workflow needs; deeper modes cost more per check.
Hallucination thresholds
Pick how strict each check is. Automatic thresholds learn from your real results; or set your own bar, from 0 to 100, for each check.
- Low toleranceFinance, medical, education, legal
- Medium toleranceInternal tools, drafts, research
- High toleranceCreative writing, brainstorming
Learning from your results
StricterLooser
When an answer fails
Choose what DeepRails does with it, and how many tries it gets to fix it.
Extra tools for harder checks
- Web search
Checks facts against the live web, for answers that need to be up to date.
- File search
Checks answers against your own documents.
- Context awareness
Uses the extra context you send for sharper, more careful checks.
Real results
From the clients we build for and protect.
$1.4MSaved every year
Healthcare
How Nightingale College Saves $1.4M a Year by Grading Nursing Videos With AI
The college grades 90,000 nursing skills videos a year. DeepRails built the AI that does it: the cost fell from $1.5M a year to under $100K, with 92% agreement with expert graders.
HarvardIts former Dean chose us to build his AI
Leadership
The AI Nobody Else Could Build: How DeepRails Created Permeos for the Former Dean of Harvard Business School
100xGrowth in student enrollment
Education
Quiklearn Increases Student Numbers by 100x with DeepRails' Defend API
We have embedded DeepRails into two client engagements where the stakes around AI accuracy were non-negotiable.
Read more
We have embedded DeepRails into two client engagements where the stakes around AI accuracy were non-negotiable. Their ability to evaluate, explain, and remediate LLM output quality at speed is unlike anything we have seen from the market.
Try it in the Playground
Paste a question and your AI's answer. Watch DeepRails score it and fix it. No code needed.
Try it on your promptsLive in three steps
- Connect your AI
Add DeepRails to your own AI to filter out hallucinations. Our API connects in minutes.
Python, TypeScript, Go or Ruby
- Send each answer
Your AI's answers go to DeepRails Defend before your users see them.
Works with any model
- Get it back right, automatically
Right answers go straight through. Wrong ones come back fixed.
Read more
Every check and fix shows in your console, with the score before and after.
Earn the trust badge
Like the padlock on a secure website, the Hallucination Safe badge tells your customers your AI is checked.
Read more
Available on Pro and Enterprise plans once your integration meets DeepRails' quality bar.
Plans. Free to start
Free
$0 /month
For devs exploring DeepRails
- Playground access only
- Restricted Playground usage
- Identify & fix low quality outputs
Basic
$49 /month
For solo devs
- API access
- Access to DeepRails Defend
- Unrestricted Playground usage
- 1 seat included
- Basic ticket support
Pro
$149 /month
For growing dev teams
- Priority API access
- Access to DeepRails Defend
- Request custom guardrails
- Hallucination Safe™ certification
- 10 seats included
Enterprise
$499 /month
For AI-first enterprises
- Private API access
- Request new custom guardrails
- Training, white-labelling & custom deployment
- Hallucination Safe™ certification
- Unlimited seats included
Straight answers
What does DeepRails Defend do?
It checks every answer your AI gives against the checks you pick. When an answer fails, it fixes it and checks it again, so only a passing answer reaches your user.
Which AI models does it work with?
Any model that produces text: you send the prompt and the answer, and DeepRails checks it.
Can it flag answers without changing them?
Yes. Choose to flag instead of fix, and DeepRails scores each answer and tells you whether it's safe to show.
What does a check cost?
Paid plans come with free credits, then cost from $15 to $20 per 1,000 calls, depending on the plan. One credit is one call to DeepRails Defend.
Can I try it free?
Yes. The free tier gives you the Playground to test checks on your own prompts.
Ready to ship AI
your customers can trust?
Start free. No credit card required.
- Pick a time
- Talk with our team
- Get a clear next step