Build faster. Ship better software.
Four professional-grade infrastructure services for building, testing, and hardening your integrations — no setup, no accounts, zero cost.
Four services for builders
Stateless, private infrastructure sandboxes — live instantly, no keys or accounts required.
Mock API
Professional REST sandbox with chaos engineering
A stateless REST API sandbox that generates realistic, schema-driven response data on every request. Configure delay, HTTP error codes, and chaos parameters (random 5xx injection, network simulation) to stress-test your frontend against real failure modes. No keys, no registration — endpoint is live the moment you open it.
Common use cases
- Prototype a new frontend feature before the real API is built
- Test loading states and skeleton UIs with configurable delays
- Build E2E tests that always get deterministic data
- Demo a product to a client without needing a live backend
Webhook Tester
Real-time HTTP callback inspector
Point any service at your personal webhook endpoint and watch every incoming request arrive in a live log — headers, body, query params, and timing. Define custom response rules so your webhook replies exactly as your integration expects. Essential for debugging CI/CD pipelines, payment callbacks, and third-party integrations.
Common use cases
- Verify a Stripe webhook fires correctly after a test payment
- Debug a GitHub Actions webhook without deploying a server
- Inspect the exact payload structure a new SaaS sends
- Test webhook retry logic by returning configurable error codes
Email Sandbox
Black-hole SMTP — preview without sending
A disposable SMTP server that catches outbound emails from your development or staging environment and renders them in a preview inbox. Inspect full HTML rendering, check spam scores, verify attachments, and analyse headers — without ever sending a message to a real recipient. Prevents the classic "oops, sent 500 test emails to customers" incident.
Common use cases
- Preview a new email template across simulated clients
- Verify transactional emails fire correctly after a user action
- Check spam headers before switching to a production SMTP service
- Test bulk sends on staging without a real email quota
Payment Simulator
Full payment lifecycle — zero financial risk
Simulate the complete payment intent lifecycle — create, confirm, fail, refund — in a stateless sandbox that dispatches realistic webhook events to your server. Trigger fraud scenarios, network timeouts, and card decline codes on demand. Build and harden your checkout flow without touching a test account or risking real transactions.
Common use cases
- Test how your order page handles a card decline gracefully
- Verify your refund logic fires the correct webhook handler
- Simulate a payment network timeout and check retry behaviour
- Load-test checkout without generating real payment records
Chaos Engineering
Inject delays and server errors via simple URL parameters to test your app's resilience under realistic service failure conditions
Stateless & Fast
No accounts or database setup required. Instant API endpoints with predictable data structures for rapid development
Privacy First
Full-privacy sandbox. We don't store your test payloads or monitor your private integrations. Your data stays yours
Engineering Guides
In-depth technical resources for modern engineering
Background Removal Quality: AI Issues & Fixes
Learn why AI background removal fails on hair, transparent objects, and complex scenes. Discover manual refinement techniques, preventive measures, and best practices for professional-quality results.
Image Compression Physics: JPEG, PNG, and WebP
Explore the mathematics and physics behind image compression. Learn how JPEG, PNG, and WebP work, when to use each format, and how to achieve optimal file sizes without sacrificing quality.
JSON vs. XML vs. YAML: Data Format Comparison
Compare JSON, XML, and YAML data formats. Learn their strengths, weaknesses, performance characteristics, and ideal use cases. Discover which format is best for APIs, configs, and data exchange.