TimetoTest LogoTimetoTest
Start free

OpenAI Codex vs TimetoTest
Read the diff. Run the change.

Codex writes and reviews code. TimetoTest runs the change in a sandbox and shows you what broke before you merge.

src/services/auth.ts
Viewed
142
async function refreshSession(token: string) {
143
const session = await db.sessions.findUnique({ where: { token } });
144
- if (session.expiresAt < new Date()) {
timetotest-code-reviewbotnow

Reproduced in the sandbox: Signing back in after the session expired logs the user out in a loop. Found by running the sign-in flow against the changed code.

Steps, report and video attached to the PR.
144
+ if (!session || isNaN(session.expiresAt.getTime()) || session.expiresAt <= new Date()) {
145
return review.summary();

Coding agent vs testing teammate

Both work on pull requests. One reviews the code; the other tests the change.

Feature
TimetoTest
Codex
Automated pull request review
General-purpose coding agent
Runs the changed behavior in a sandbox
Codex runs tasks in cloud environments; TimetoTest tests the change in configured automatic PR workflows
Uses the app like a user (sign-in, browser flows)
Codex can be prompted to write and run such checks
Opens a fix as a pull request
TimetoTest where the workflow supports it
Shared run record with a video of browser runs
The honest breakdown

Where each one fits

Codex helps you make changes. TimetoTest checks what they do.

01

OpenAI Codex

Codex is OpenAI's coding agent. It works in the cloud, the terminal and the editor, writes code, runs commands, opens pull requests and can review them.

Teams configure its review behavior with AGENTS.md and the openai/codex-action GitHub Action, so it adapts to how the team works.

02

TimetoTest

TimetoTest runs on connected pull requests with automatic review enabled. It runs the changed behavior in a sandbox and posts what it found back on the PR, before anyone merges.

Findings come with the steps to reproduce, a report and, for browser flows, a video. Where the workflow supports it, TimetoTest can also open the fix as a pull request.

03

The honest verdict

Choose Codex to write changes and review code.

Add TimetoTest when you want each pull request tested against the running app by a tool that didn't write it.

The bottom line

Codex and TimetoTest

Does OpenAI Codex do code review?

Yes. Codex, OpenAI's coding agent, can review GitHub pull requests, including through the openai/codex-action GitHub Action. It posts comments and can propose code changes. Teams can tune its behavior with an AGENTS.md file.

What is the core difference between Codex and TimetoTest?

Codex is a general coding agent that can also review the diff. TimetoTest is built to test the change: it runs the changed behavior in a sandbox on connected pull requests with automatic review enabled and reports what happened, with a report and, for browser flows, a video.

Should a team use both?

Often, yes. Codex is useful for writing changes and reviewing code. TimetoTest checks what those changes do when they run, from a tool that didn't write them.

Code review that runs your changes.
Try TimetoTest.

Connect a repository and get a tested result on your next pull request.

Free account; testing requires credits or a paid planWorks with GitHub & GitLab