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qckfx vs GPT Driver

Overview

GPT Driver

GPT Driver is an AI-powered testing tool that uses large language models to drive browsers or apps through natural-language instructions. It translates prompts into automated steps and validations.

qckfx

qckfx focuses on deterministic replay for iOS apps. It records real simulator usage and replays it exactly, showing visual, log, and behavioral differences between runs.

Key Differences

Primary Model

GPT Driver

LLM interprets instructions and dynamically decides actions.

qckfx

Records concrete interactions and replays them deterministically.

Execution Style

GPT Driver

Runtime reasoning drives the test path.

qckfx

Fixed replay path ensures identical state, network responses, and seeded values.

Verification Output

GPT Driver

Pass/fail based on interpreted expectations or prompts.

qckfx

Full diff of what changed during a recorded flow.

Test Authoring

GPT Driver

Define intent via prompts.

qckfx

Humans or agents drive the simulator; no test code or prompt-based test definition required.

Coverage Expansion

GPT Driver

Increase coverage by writing new prompts or scenarios.

qckfx

Increase coverage by recording additional flows through exploration.

Change Visibility

GPT Driver

Evaluates whether a goal was achieved.

qckfx

Shows exactly what changed compared to a baseline replay — useful for reviewing pull requests or verifying modifications made by coding agents.

Human and Agent Workflow

GPT Driver

The agent issues natural-language goals and the LLM determines the path at runtime.

qckfx

The agent drives the simulator via CLI or MCP, the session is recorded, and that replay becomes a reusable verification baseline. Humans can also record flows manually.

When GPT Driver Is a Better Fit

—You want natural-language-driven automation.
—You are testing dynamic user journeys that benefit from runtime reasoning.
—You prefer goal-based testing over fixed replay.

When qckfx Is a Better Fit

—You need deterministic regression baselines.
—You want to see full behavioral diffs after a PR.
—You want recorded flows to act as a system of record for verification.
—You want to expand coverage through simulator usage without maintaining prompt-based tests.

See How It Works

Watch qckfx record and replay a real simulator session — no test code required.

How qckfx works

Documentation

Get started with recording your first flow, setting up MCP for agent workflows, and more.

Read the docs