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Mockoon is the easiest and quickest way to design and run mock REST APIs. No remote deployment, no account required, free and open-source.

Startup credits and Agent Readiness report cards with sources you can inspect.

Which is more popular?
Based on our record, Mockoon should be more popular than Sourcey. It has been mentioned 35 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | mockoon.com | sourcey.com |
| Pricing | ||
| Platforms | — | |
| Company | Startup from Luxembourg · 1 - 9 employees · 2017 | — |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of Mockoon yet.
Sourcey tests how agents can use software and records what companies offer startups. Read Agent Readiness report cards to see the task tested, observed result, blockers, and what remains unverified. Find startup credits, discounts, and programs with their terms, eligibility caveats, and original...
What each product offers, as listed by its team.


An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
Mockoon is recommended for developers, QA testers, and software teams who require fast and reliable mock APIs for testing or development, as well as those who prefer a lightweight, standalone solution that can be run locally on their machines.
No analysis of Sourcey yet.
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Mockoon and Sourcey.
Sourcey's answer:
Sourcey ties startup offers and Agent Readiness findings to source evidence and versioned releases. A report card describes one agent task, its observed result, blockers, and unknowns. Offer records keep the vendor’s terms and eligibility caveats visible. The public record is free to read through the website, JSON, API, and MCP.
Sourcey's answer:
Founders comparing startup offers, developers evaluating whether an agent can complete a specific task with a service, and agents that consume the public record through HTTP or MCP.
Sourcey's answer:
Choose Sourcey when you need the original source behind an offer or a task-level account of what an agent could actually do. It shows uncertainty and release history alongside the finding. Sourcey does not apply for offers or redeem credits on a founder’s behalf.
Share your experience with using Mockoon and Sourcey. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.


Email: guillaume[at]1kb.software While bootstrapping http://mockoon.com I'm freelancing to keep the lights on. - Source: Hacker News / over 1 year ago
Mockoon: This open-source desktop application offers a fast setup with a user-friendly interface. It excels at creating customizable responses and supports multiple environments without requiring complex configuration. Mockoon is... - Source: dev.to / over 1 year ago
Mocking: Help your front-end team discover integration or design issues Early in the API development process by mocking your API endpoints. You can either due this directly from your gateway, or use a service like Mockoon. - Source: dev.to / over 1 year ago
For example, from the Sourcey agent-readiness release Release_id sha256:371cbf65650abf5756c967b1f1da9df607be4b1bb0c0b93aaf2dcf0a36e75d3e (artifact_sha256:67c4edef061ca4ea60cef1e1bc246d2ce0b7d6b12e227c0811d7405d3d0a63ac, Effective... - Source: dev.to / about 18 hours ago
Doing all this by hand for every candidate got old fast, so now I lean on Sourcey, a registry that tracks exactly this. It publishes report cards that grade whether an agent can actually sign up, pay, and operate a service on its own,... - Source: dev.to / 13 days ago
Machine-readable acceptance criteria are worth more to an agent than documentation quality. A page that says we accept X, with a named artifact and its schema, is worth ten pages of tutorials, because it lets the agent verify a claim... - Source: dev.to / 28 days ago
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