Pre-launch beta — shipping fast with early teams

Load test Client URLat scale, with clarity

Simulate thousands of concurrent users via distributed workers. Get a detailed report card with latency, throughput, error rates, and server health metrics.

Start testing free →Watch 2-min demo

loadcurl · 1,000 concurrent

$ lf test --endpoint https://api.yourapp.com/v2/users

$ --workers 1000 --duration 60s --ramp 10s

▶ Spawning workers across 12 regions...

✓ 1000/1000 workers online

· RPS 8,420 req/s

· P95 latency 342ms

· Error rate 0.04%

· Throughput 1.2 GB/s

■ Report card ready → Grade: A-

Now

Core API load testing MVP

Beta

Early access rollout

Roadmap

Global regions + multi-protocol

Focus

Fast feedback for small teams

Core capabilities

Everything you need to break your API before your users do

A complete toolkit for load testing, analysis, and team collaboration — no infrastructure required.

⚡

Distributed worker swarm

Scale realistic load tests with distributed workers and coordinated traffic patterns. Available now in our beta footprint, with additional global regions planned.

📋

Report card grading

Every test produces a graded report card (A-F) scoring latency, error rate, throughput, and stability. Share a public link or export to PDF.

📈

Real-time metrics

Watch P50/P95/P99 latency, RPS, error rates, and server resource usage stream live as your test runs. No waiting for results.

🏢

Organization management

Invite teammates, set role-based access (Owner, Admin, Tester, Viewer), manage billing, and share test history across your whole org.

🔐

Session and device tracking

See every active login session with device type, OS, location, and last activity. Revoke individual sessions or all devices instantly.

🎯

Endpoint scenario builder

Chain multiple API endpoints in a single test scenario. Set headers, auth tokens, request bodies, and dependencies between calls.

🔔

Threshold alerts

Define SLA thresholds and get email alerts when key metrics breach limits. PagerDuty and additional alert channels are on the roadmap.

🔗

CI/CD integration

Plug Load Curl into GitHub Actions, GitLab CI, or Jenkins. Block deploys automatically when a load test fails your grade threshold.

🌐

Multi-protocol support

Today: REST and GraphQL endpoints with common auth patterns. gRPC and WebSocket support are planned for future releases.

How it works

From endpoint URL to graded report in under 60 seconds

STEP 01

🔗

Paste your endpoint

Add your API URL, set auth headers, and configure request body. Import from Postman or OpenAPI specs.

STEP 02

⚙️

Configure load profile

Set concurrent users, duration, ramp-up time, and select target worker regions for realistic geographic distribution.

STEP 03

🚀

Workers attack

Distributed workers across our global network hammer your endpoint simultaneously, recording every metric.

STEP 04

📊

Get your report card

Receive a comprehensive graded report with recommendations, bottleneck identification, and comparison to previous runs.

Report card system

Know exactly how your API performs under pressure

Our grading algorithm weights 8 metrics to produce a single, actionable letter grade — with detailed breakdowns and fix recommendations for every failing dimension.

A Excellent - ready for scale, all metrics green
B Good - minor latency issues, low risk
C Fair - needs tuning before high traffic
F Critical - server degradation detected

Test Run #2847

api.yourapp.com/v2/users · 1,000 concurrent

A-

P95 Response Time

342ms

Requests / sec

8,420

Error Rate

0.04%

Throughput

1.2 GB/s

Server CPU Peak

79%

Availability

99.96%

⚠ Recommendation

P95 latency exceeds 300ms target. Consider adding a CDN layer or optimizing the database query on /v2/users - 78% of slow requests originate from a single unindexed join.

Organizations

Built for teams, not just solo devs

Collaborate on test suites, manage access controls, and share results across your entire engineering org.

👥

Team management

Invite members by email. Assign roles: Owner, Admin, Tester, or Viewer. Fine-grained permissions per project.

📁

Shared test library

Store, version, and reuse test configurations across projects. Tag, search, and organize with custom labels.

💳

Centralized billing

One subscription for the whole team. Track usage per member or project. Monthly invoices with usage breakdown.

📣

Audit log

Full audit trail of who ran which test, when, and what changed. Export logs for compliance requirements.

Acme Corp

Pro Organization · 14 members

Active

Jane Doe

jane@acme.com

Owner

Mike Kim

mike@acme.com

Admin

Sara Reyes

sara@acme.com

Tester

847

Tests run

Members

Projects

Security & access

Full visibility into every active session and login device

Know exactly where your account is signed in. Revoke suspicious sessions instantly — individually or all at once.

Active sessions

💻 MacBook Pro · Chrome 124

Current

Mumbai, IN · Now

📱 iPhone 15 · Safari

Active

Ahmedabad, IN · 2h ago

🖥️ Windows 11 · Firefox 125

Idle

Bengaluru, IN · 3d ago

💻 Linux · VSCode Extension