Zero-knowledge, AI-native API studio and multi-protocol HTTP/REST, GraphQL, WebSocket, SSE, and gRPC workbench. 100% git-versionable Bruno OpenCollection YAML format, SQLCipher 4 secrets scrubber, AI assertion generator, and high-performance async Rust engine (<65MB RAM).
Native CAPost v1.0.1 interface: 100% Git-friendly Bruno OpenCollection YAML, SQLCipher local secret scrubber, and instant QuickJS test assertions.
{ "order_id": "0192e411-8a4b-7000", "amount_minor": 2900, "currency": "USD", "client_token": "{{vault.card_nonce}}" }{ "success": true, "transaction_id": "tx_sovereign_982", "status": "settled", "captured_at": "2026-10-27T08:14:02Z", "hash": "0x4fe2...a98" }capost-cli run collection.yamlBenchmarked on Linux x86_64 Fedora 44 across a 500-endpoint multi-protocol suite.
| Evaluation Metric | CAPost (v1.0.1) | Postman (Electron/Cloud) | Insomnia (Electron) | Bruno (Electron) | Hoppscotch (Web/PWA) |
|---|---|---|---|---|---|
| Cold-Start Launch | < 300ms (Rust Native) | > 4,800ms | ~3,500ms | ~2,100ms | ~2,400ms |
| RAM Usage (Idle) | < 65 MB | > 480 MB | ~320 MB | ~140 MB | ~190 MB |
| Collection Storage Format | OpenCollection YAML (Git-First) | Proprietary Cloud Lock | Proprietary Cloud Sync | Bru Plaintext Files | Cloud DB / JSON |
| Secrets Security | SQLCipher 4 + PII Scrubber | Plaintext / Foreign Cloud | Plaintext / Foreign Cloud | Plaintext .env files | Browser LocalStorage |
| Multi-Protocol Support | REST, GraphQL, WS, SSE, gRPC | REST, WS, gRPC | REST, GraphQL | REST, GraphQL | REST, WS |
| Headless CI/CD Runner Size | ~12 MB (capost-cli binary) | > 180 MB (Newman + Node) | Inso CLI (Heavy) | Bruno CLI (Node) | CLI (Node) |
Built for backend engineers and QA automation professionals who reject cloud vendor lock-in and demand absolute secrets privacy.
Human-readable, 100% Git-friendly YAML collection specification with zero proprietary cloud locks and full Bruno ecosystem interoperability.
Auth tokens, Bearer secrets, and API keys encrypted locally with SQLCipher 4 and Argon2id, equipped with automated regex scrubber to eliminate PII leaks.
First-class client support for HTTP/1.1, HTTP/2, REST, GraphQL queries, WebSocket streaming, Server-Sent Events (SSE), and binary gRPC RPCs.
Intelligent AI assistant generating automated test assertions, response contract schemas, and realistic edge-case mock payloads in seconds.
Ultra-compact ~12 MB native binary requiring zero Node.js runtimes to execute automated test suites inside GitHub Actions or GitLab CI pipelines.
Spin up instant local mock servers powered by pure async Rust to emulate complex JSON schemas, status codes, and variable network latency.
Effortlessly toggle across Dev, Staging, and Production profiles with dynamic variable replacement and per-environment secret encryption.
Execute pre-request and post-response lifecycle hooks using modern JavaScript without NodeJS memory bloat or npm supply chain vulnerabilities.
Engineered in pure Rust 2024. Instant cold-start under 300 milliseconds and idle memory footprint under 65 MB—8x lighter than Electron competitors.
Compare payload responses across test executions side-by-side with detailed timing waterfalls across DNS, TCP, and TLS handshakes.
Lossless instant migration from Postman Collection v2.1, Insomnia workspaces, and OpenAPI/Swagger specifications.
Operates completely offline with zero forced cloud logins, zero query analytics, and complete cryptographic endpoint data sovereignty.
Choose between our popular lifetime license or flexible monthly subscriptions.
Perfect for individual developers and QA testers wanting a clean, ultra-fast local API client without vendor lock-in.
For backend leads and QA engineers demanding SQLCipher encryption, gRPC/SSE protocols, and AI assertion generation.
Flexible monthly subscription option for teams needing encrypted multi-device relay synchronization.
Everything you need to know about OpenCollection YAML, token security, and the CI/CD runner.
Not at all. CAPost is a 100% local-first API studio with zero telemetry. All environment secrets and tokens are encrypted locally with SQLCipher 4 and Argon2id. Requests travel point-to-point directly to your endpoints without passing through any foreign proxy or cloud logger.
OpenCollection is an open, human-readable YAML specification that is 100% Git-friendly. Every request and folder exists as regular files in your filesystem. It shares full compatibility with Bruno collections, allowing effortless Git commits, pull request diffs, and conflict resolution without cloud locks.
Yes. The standalone capost-cli runner is an ultra-compact ~12 MB native binary requiring zero Node.js or Electron runtimes. Simply run 'capost-cli run collection.yaml' inside GitHub Actions, GitLab CI, or Docker containers with JUnit XML or JSON reporting.
CAPost embeds a pure Rust async mock engine. You can spin up instant local mock endpoints to emulate complex JSON schemas, status codes, and variable network latency with under 10 MB of RAM consumption.