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A complete debugging suite and a better alternative to Mockoon

Mockoon is a great, free tool for spinning up local mock API servers. Requestly does the same mocking, then adds live traffic interception and a built-in API client in one workspace.

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Mockoon is great at mocking. Requestly covers the whole workflow.

Mockoon is a great, free tool for spinning up local mock API servers. The gaps show once mocking is only one part of a debugging and testing workflow.

What Mockoon gives you

Great at local mocking

Free local mock API servers
Faker support
Offline mocks
File mocks and API latency

What's missing

The gaps beyond mocking

No built-in API client
No GraphQL support
No script injection
No page-level filters

More than a mock server

Requestly does the same mocking as Mockoon, then adds live traffic interception, a built-in API client, and team collaboration in one workspace.

Cloud mocks without installing a binary

Create mocks from the cloud with no binary to install, so they work outside your local system. Group APIs into collections served from a single endpoint to mock a whole service, and use pre-built mocks to return 2xx, 4xx, or 5xx responses.

Cloud-based mocks, no binary to install
API mock collections served from one endpoint
Pre-built mocks for 2xx, 4xx, and 5xx status codes

Intercept and override real APIs, zero code changes

HTTP Rules let Requestly intercept and override real APIs with zero code changes, not even a hostname change. An active toggle switches between mock and real APIs, and non-intrusive mocks return a mock response until your real API is ready.

Override real APIs with HTTP Rules, no code changes
Active toggle between mock and real APIs
Non-intrusive mocks via the Modify API Response rule

Beyond mocking: API client, GraphQL, and scripts

Where Mockoon stops at mocking, Requestly adds a built-in API client, support for schema-based GraphQL APIs, and the ability to inject scripts, all in the same workspace.

Built-in API client alongside your mocks
Support for GraphQL APIs
Inject scripts and page-level filters

Collaboration and enterprise controls

Shared workspaces synchronize rules across your team so everyone has instant access and no one duplicates work. For larger orgs, Requestly adds SSO, team management, role-based access control, and SOC-II compliance.

Shared workspaces sync rules across the team
SSO and role-based access control
SOC-II compliance and reporting

Requestly vs Mockoon, feature by feature

Feature	Requestly	Mockoon
Open Source	No	Yes
Lightweight	Yes	No
Faker	No	Yes
File Mocks	Yes	Yes
API Latency	Yes	Yes
Cloud Mocks	Yes	Yes
Offline Mocks	No	Yes
GraphQL support	Yes	No
Inject Scripts	Yes	No
Page level filters	Yes	No
Collaboration	Yes	Yes
Mock server	Yes	Yes
API client	Yes	No
Enterprise-ready	Yes	No
Support	Yes	Yes