Mock any OpenAPI in minutes.
Upload/paste your OpenAPI spec -> get a hosted mock API URL with stable, demo-safe responses.
Target: live in under 5 minutes.
Built for the people who set up the demo.
Mocksmith is built to help frontend devs and sales engineers ship a reliable demo environment fast without waiting on backend coding.
Leaders get fewer demo failures and faster deal cycles.
How it works
Built for engineers and demo owners.
Focus on fast setup and predictable behavior for high-stakes demos.
Bring in your spec in one step and instantly generate endpoints for local or hosted demo environments.
Keep outputs consistent across requests so your flows stay predictable from rehearsal to live demo.
For leaders: fewer demo failures, faster deal cycles.
Secure funding faster with compelling investor presentations
Show investors a live, clickable product before it's built. Demonstrate your vision with interactive prototypes that feel production-ready and build confidence in your execution.
Increase revenue and decrease deal cycle time
Ensure your sales team can show polished, cutting-edge features to customers, closing deals faster with reliable presentations.
Save hours of engineering time per week
Get demos out to customers and stakeholders 10x faster while your engineering team focuses on building the real product.
Build customer trust with consistent, production-ready presentations
Every presentation looks perfect, every time. Build credibility and close deals through flawless execution that reflects your company's quality.
MVP focus now, with more planned next.
Turn OpenAPI into working endpoints. No backend coding required.
Responses stay consistent across requests so your demo doesn't drift.
Guided controls for high-stakes presentations are planned after the core MVP release.
Save and replay curated demo flows are planned for a later phase.
Get early access to faster, safer demos.
We're onboarding technical teams who need predictable API mocks for real demo deadlines.
Tell us your stack/spec source; we'll prioritize onboarding.
Tell us your stack/spec source; we'll prioritize onboarding.
Created by builders who know what demo pressure feels like.
Mocksmith is crafted by engineers and designers who have lived the pain of unreliable demos.
We're building a product that ensures your vision never breaks on stage.