Beeceptor From $10/mo · Free plan 9.5 Visit Mockfly
mockfly.dev
What it is
Mockfly provides hosted mock REST API endpoints for teams building or testing before a backend is ready. An endpoint can return JSON, XML, or files such as PDFs and CSVs, and can select among several responses using rules tied to incoming requests. Mock data can use Faker.js templates or AI-generated JSON. Projects can start from OpenAPI, Swagger, Postman collection, or HAR imports; a Chrome extension can capture browser requests and add selected endpoints. Teams can share and edit mocks, inspect request logs, and review response-body history. For offline work, the mockfly-cli npm package pulls projects to serve locally. A public REST API and MCP server support programmatic mock creation and editing. Mockfly lists API, extension, Linux, self-hosted, and web platforms, and supports REST and WebSocket. The free Starter plan allows 500 requests per day, one project, four endpoints, and two responses per endpoint. Pro costs €15 a month; Team costs €49 a month; Company is listed from €199 a month.
Spec sheet
- What it does
- Mockfly provides hosted HTTPS mock API endpoints so teams can build and test before a real backend exists.Read 15 Oct 2026 · mockfly.dev
- Purpose
- Mockfly creates hosted mock REST API endpoints so teams can build and test before a backend is ready.Read 29 Sep 2026 · mockfly.dev
- Intended users
- Mockfly describes its users as frontend, backend, mobile, QA, and testing engineers who need shared mock APIs.Read 29 Sep 2026 · mockfly.dev
- Integrations
- The Chrome extension captures browser requests and adds selected endpoints to a Mockfly project.Read 29 Sep 2026 · mockfly.dev
- Support
- Support is provided directly by the builders through email, in English or Spanish.Read 15 Oct 2026 · mockfly.dev
- Founded
- 2023Read 28 Sep 2026 · mockfly.dev
- AI generation
- Natural-language descriptions can generate JSON response structures and endpoint descriptions.Read 15 Oct 2026 · mockfly.dev
- API specification
- The public API has a machine-readable OpenAPI 3.1 specification and a Postman collection.Read 15 Oct 2026 · mockfly.dev
- Automatic documentation
- Mockfly generates documentation from defined endpoints and keeps it available for sharing.Read 15 Oct 2026 · mockfly.dev
- Automation
- A public REST API and an MCP server can be used to create and edit mocks programmatically.Read 29 Sep 2026 · mockfly.dev
- Callbacks
- Paid plans can send delayed outgoing webhooks with retries, headers, bodies and optional HMAC-SHA256 signatures.Read 15 Oct 2026 · mockfly.dev
- Chrome extension
- The extension captures browser requests and lets users add selected requests to a Mockfly project.Read 15 Oct 2026 · chromewebstore.google.com
- Company location
- The site footer identifies Madrid as Mockfly's location.Read 15 Oct 2026 · mockfly.dev
- Company origin
- Mockfly says it was started in 2023 by Sergio Zamarro and is self-funded by a small independent developer team.Read 15 Oct 2026 · mockfly.dev
- Conditional responses
- Rules select responses using request parameters, headers or body content.Read 15 Oct 2026 · mockfly.dev
- Custom domains
- Paid plans can serve mocks on a customer hostname with Mockfly-managed TLS certificates.Read 15 Oct 2026 · mockfly.dev
- Data formats
- Endpoints can return JSON, XML, or files such as PDF and CSV.Read 29 Sep 2026 · mockfly.dev
- Data generation
- Mockfly supports Faker.js templates and AI-generated JSON payloads.Read 29 Sep 2026 · mockfly.dev
- Data handling
- The company says it stores mock definitions and project request logs only to run the service, does not sell them and does not set tracking cookies.Read 15 Oct 2026 · mockfly.dev
- Dynamic routes
- Path parameters such as /users/:id are supported.Read 15 Oct 2026 · mockfly.dev
- Endpoint creation
- Users define paths, HTTP methods, status codes, headers and response bodies in a browser without installing software.Read 15 Oct 2026 · mockfly.dev
- Extension privacy
- The Chrome listing says the developer does not collect or use user data and does not sell it.Read 15 Oct 2026 · chromewebstore.google.com
- Faker.js integration
- Faker.js placeholders generate changing realistic names, emails, addresses and other data on requests.Read 15 Oct 2026 · mockfly.dev
- Imports
- OpenAPI, Swagger, Postman and HAR captures can be imported into editable projects.Read 15 Oct 2026 · mockfly.dev
- Limit: AI accuracy
- A G2 reviewer says AI responses are not always fully accurate and need adjustment.Read 15 Oct 2026 · g2.com
- Limit: desktop app
- A G2 reviewer notes that Mockfly has no desktop version.Read 15 Oct 2026 · g2.com
- Limit: manual synchronization
- G2 reviewers say changes in the real API must be copied into Mockfly manually.Read 15 Oct 2026 · g2.com
- Limit: rule editing
- A G2 reviewer finds the rules editor somewhat clunky.Read 15 Oct 2026 · g2.com
- MCP integration
- An npm MCP client manages projects, endpoints, responses and conditional rules from Claude Desktop or Antigravity.Read 15 Oct 2026 · mockfly.dev
- Multiple responses
- One endpoint can hold several responses for success, errors and edge cases.Read 15 Oct 2026 · mockfly.dev
- Notable free limit
- The Starter plan is limited to 500 requests per day, one project, four endpoints, and two responses per endpoint.Read 29 Sep 2026 · mockfly.dev
- Offline CLI
- The mockfly-cli npm tool pulls projects online and serves them locally offline on localhost:4000.Read 15 Oct 2026 · mockfly.dev
- Offline use
- The mockfly-cli npm package can pull projects and serve them locally without an internet connection.Read 29 Sep 2026 · mockfly.dev
- Praise: ease of use
- G2 reviewers repeatedly describe Mockfly as easy, intuitive and quick for creating API mocks.Read 15 Oct 2026 · g2.com
- Praise: interface and AI
- Reviewers praise the pleasant interface, AI-generated data and automatic documentation.Read 15 Oct 2026 · g2.com
- Praise: support
- Several G2 reviewers report fast, helpful customer support and quick responses.Read 15 Oct 2026 · g2.com
- Proxy mode
- Projects can forward requests to a real API and switch between proxy and mock behavior.Read 15 Oct 2026 · mockfly.dev
- Public API
- A REST API at api.mockfly.dev manages projects, endpoints, responses and rules using account API keys.Read 15 Oct 2026 · mockfly.dev
- Python SDK
- A public Python SDK repository documents pip installation plus identify and get_flag methods, but has no published releases.Read 15 Oct 2026 · github.com
- Rating on Chrome Web Store
- 5.0 out of 5 from 1 ratingRead 15 Oct 2026 · chromewebstore.google.com
- Rating on G2
- 5.0 out of 5 from 6 reviewsRead 15 Oct 2026 · g2.com
- Response formats
- Endpoints can return JSON, XML or files such as PDF and CSV.Read 15 Oct 2026 · mockfly.dev
- Responses
- Each endpoint can have multiple responses selected by conditional rules based on incoming requests.Read 29 Sep 2026 · mockfly.dev
- SDK licensing
- The public JavaScript SDK repository is licensed Apache-2.0.Read 15 Oct 2026 · github.com
- Security and data
- Mockfly says it stores mock definitions and project request logs to run the service, does not sell that data, and does not set tracking cookies.Read 29 Sep 2026 · mockfly.dev
- Security statement
- Mockfly says user data is encrypted and protected by strict security protocols.Read 15 Oct 2026 · mockfly.dev
- Service status
- The status page reports all services operational and shows a recorded three-minute API outage on December 23, 2025.Read 15 Oct 2026 · status.mockfly.dev
- System requirements
- The hosted product requires only a browser; the FAQ says no software installation is needed.Read 15 Oct 2026 · mockfly.dev
- Team collaboration
- Projects support shared workspaces, invitations and real-time collaboration.Read 15 Oct 2026 · mockfly.dev
- Team features
- Teams can share and edit mocks, inspect request logs, and view response body history.Read 29 Sep 2026 · mockfly.dev
- WebSocket mocking
- The service supports WebSocket endpoints in addition to REST mocks.Read 15 Oct 2026 · mockfly.dev
Plans and prices
Starter Free 0€ per month 500 requests per day · 1 project · 4 endpoints · 2 responses per endpoint Read 29 Sep 2026 · mockfly.dev
Starter Free 0€ per month 500 requests/day · 1 project · 4 endpoints · 2 responses per endpoint Read 15 Oct 2026 · mockfly.dev
Pro €15 a month 15€ per month Unlimited requests · projects · endpoints · responses · AI JSON generation · AI endpoint descriptions · custom domain · callbacks Read 15 Oct 2026 · mockfly.dev
Team €49 a month 49€ per month for 5 seats Everything in Pro · 5 seats · 9€ per extra seat · free-account collaborators · one invoice · priority support Read 15 Oct 2026 · mockfly.dev
Pro annual €150 a year 150€ per year Same Pro features and limits Read 15 Oct 2026 · mockfly.dev
Company €199 a month From 199€ per month Everything in Team · setup assistance · custom seats, integrations and SLA Read 29 Sep 2026 · mockfly.dev
Company Priced on request From 199€ per month Everything in Team · OpenAPI/Postman setup · centralized billing · custom seats/integrations/SLA · direct builder contact Read 15 Oct 2026 · mockfly.dev
Strong points and limits
Strong points
- Conditional rules can select among multiple endpoint responses.
- Returns JSON, XML, PDF, and CSV files.
- Imports OpenAPI, Swagger, Postman, and HAR formats.
- CLI serves projects locally without internet access.
- Teams can review request logs and response history.
Limits
- Starter is limited to 500 requests per day.
- Starter allows one project and four endpoints.
- Pro costs €15 a month.
- Company pricing starts at €199 a month.
Who it suits
Mockfly suits frontend, backend, mobile, QA, and testing engineers who need shared mock APIs. Its local CLI and programmatic interfaces may also suit teams working offline or automating mock management.
Verdict
Mockfly combines hosted mock endpoints, import options, team collaboration, and local serving. The free plan has defined project, endpoint, response, and request limits; paid plans add higher capacity and features.
Where Specifiction places it
- API Mocking Tools#2 of 269.2
