A good decision starts with the right questions.
Most teams pick the wrong technology not because they lack information, but because they asked the wrong questions.
Tech Duel guides you through the questions that actually matter for your team, your stack, and your situation. Then gives you a recommendation you can defend.
app.tech-duel.com
Your recommendation
78%
Use PostgreSQL
High confidence
PostgreSQL is the stronger choice given your ACID requirements, existing team expertise, and complex query patterns. MongoDB's schema flexibility isn't worth the consistency trade-offs for your use case.
Side-by-side comparison
| Factor | PostgreSQL ✓ | MongoDB |
|---|---|---|
| ACID compliance | Full | Partial |
| Complex queries | Excellent | Limited |
| Schema flexibility | Structured | Dynamic |
Built for the engineer who owns the decision.
Not for someone doing casual research. For the tech lead or architect who’s been asked to make the call and needs to defend it, to their team, their manager, or both.
Tech Duel doesn’t give you a generic answer. It asks about your existing stack, your team size, your timeline, your constraints. Then it gives you a recommendation that holds up when someone asks why.
The output is a structured report you can share. In Slack. In the architecture review. Something that says: we thought this through.
Any technology comparison, from infrastructure to AI tools
Context-aware questions built around your team, stack, and situation
A shareable report, not just an answer you have to re-explain
How it works
Walk through the questions that surface what your decision actually hinges on. Then get a recommendation with the reasoning behind it.
1
Define your context
Tell us what you’re comparing and what matters to your team: existing stack, team size, timeline, risk tolerance. The more specific you are, the more accurate the recommendation.
2
Answer questions
You'll get 12 to 20 questions specific to your two technologies and your situation. Not a generic survey. Questions that surface the variables generic comparisons ignore.
3
A decision you can defend
A clear recommendation with the reasoning behind it. Share it in the architecture review. Show your manager. The decision doesn't live in someone's head, it lives in a document everyone can point to.
See it in action
From question to recommendation in minutes.
What engineering teams are saying.
“We were going back and forth on Kafka vs Kinesis for three weeks. Tech Duel asked the right questions and gave us a recommendation the whole team could stand behind.”
DK
David K.
Principal Engineer, Fintech
“The confidence score was the conversation stopper we needed. It's not just 'use X', it's 'use X, and here's exactly why given your constraints.'”
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Priya M.
Engineering Manager, SaaS
“The comparison table alone saved us two days of research. We shared it with the whole team and had alignment by end of day.”
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Tom R.
Staff Engineer, E-commerce
“15 years in engineering and this is the first tool that factors in team expertise when making a recommendation. That matters more than almost anything else.”
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Sarah L.
VP Engineering, B2B Startup
“Used it for LangChain vs LlamaIndex for our RAG pipeline. Had a recommendation in 20 minutes. Would have taken a week of reading docs otherwise.”
AC
Alex C.
ML Engineer, AI Startup
“I sent the comparison to my CTO and she immediately understood the reasoning. No back and forth, no 'why did you pick this', just alignment.”
MJ
Marcus J.
Tech Lead, Healthcare Tech