Free tools
24 tools for OpenAI-compatible API access
Calculators, analyzers, generators, and interactive planners - all client-side except the optional endpoint smoke tester.
Calculators
Package Picker
Compare Unlimited Weekly and Monthly packages for your project timeline and get a signup link.
Cost Calculator
Estimate OpenAI monthly spend and compare it to flat unlimitedcodex weekly or monthly packages.
Build vs Buy
Estimate engineering cost to self-build keys, quotas, logs, and billing vs subscribing to unlimitedcodex.
Quota Estimator
Convert MAU and prompt assumptions into monthly tokens, requests, and quota threshold warnings.
Migration Savings
Model net savings from swapping OpenAI for unlimitedcodex flat pricing including migration labor.
Workload Calculator
Estimate concurrent connection pressure and recommend Weekly vs Monthly from load inputs.
Token Estimator
Estimate token volume from prompt or response text before quota planning and launch.
Latency Planner
Model in-flight requests against the 4-connection limit from peak RPS and p95 latency.
Analyzers
429 Decoder
Paste a 429 response body and headers to classify rate-limit vs quota pressure and see retry guidance.
Request Validator
Validate chat, embeddings, and image JSON payloads against unlimitedcodex OpenAI-compatible rules.
Migration Checker
Score your code for base URL configurability, auth patterns, streaming, and env hygiene before cutover.
Key Security Grader
Grade API key hygiene from prefix-only inputs: scopes, env vars, IP allowlists, and rotation policy.
Endpoint Smoke Tester
Probe GET /v1/models against any base URL and grade OpenAI compatibility without storing your key.
Error Code Lookup
Search unlimitedcodex error codes, HTTP statuses, retry guidance, and recovery actions.
Generators
Migration Generator
Generate or transform OpenAI SDK snippets to unlimitedcodex base URL, keys, and scopes.
Scope Configurator
Select workloads and output least-privilege scopes, .env.example, and a rotation checklist.
Request Builder
Build chat completion JSON visually and export cURL, JavaScript, or Python snippets.
Webhook Generator
Generate Node or Python webhook handlers with signature verification for unlimitedcodex events.
Env Setup
Generate .env.example blocks from selected endpoints, environment, and webhook needs.
Interactive
Retry Simulator
Tune backoff and retry settings to see simulated outcomes and copy a retry handler snippet.
Package Quiz
Answer six questions to get a Weekly or Monthly recommendation with a pre-filled signup link.
Migration Playground
Side-by-side diff view when transforming OpenAI SDK code to unlimitedcodex with model mapping.
Rate Limit Planner
Plan backoff settings and quota monitoring checklist from expected RPS and team size.
Model Advisor
Pick ChatGPT 5.5 Ultra or Codex model values from workload, latency, and streaming needs.