What Codex can do with your iPhone
Hand Codex a phone and it can run your accounts, answer your customers, test your app and clear your errands, on one iPhone or five at once.
Run all your social accounts from one Mac
Connect up to five iPhones, each signed in to several Instagram and TikTok accounts, and Codex can work 20–30 accounts for you: warming up new ones, engaging in their niche, finding creators and researching what’s working.
Try:
Across all five phones, warm up our 12 new TikTok accounts, each in its own niche, then tell me which ones already have the right For You page.
Find 15 tech creators under 100k followers who reviewed a productivity app this week, and draft a collab DM to each from @habitloop.
Scroll 50 TikToks about habit-tracker apps, pull the 5 hooks that keep going viral and turn them into launch Reel scripts for @habitloop.
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See which hashtags our top 3 competitors used on their best Reels this month and build a hashtag set for each of our accounts.
From @runclubnyc, find 10 recent #marathontraining posts where a coach’s tip would help and leave one useful comment on each.
Reply to every comment, DM and customer
Codex reads the comments, reviews and conversations across your accounts, works out what each person wants and answers them in App Store Connect, WhatsApp, Instagram and TikTok.
Try:
Go through every brand account on these phones, answer the comments asking about price, sizing or shipping, and DM the product link to anyone who asked for it.
A customer sent a photo of a dress on WhatsApp. Find it in our catalog, reply with the price and sizes, and send the checkout link.
Find every customer who asked a question this week and never heard back (WhatsApp, Instagram DMs, TikTok comments) and reply to each one.
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Open App Store Connect, answer every new 1- and 2-star review with a specific reply and list the bugs that come up more than once.
Turn the 10 questions we got most in DMs this month into saved replies, then use them to clear today’s inbox.
More ideas: Codex for Instagram accounts
Test your iOS app like your users will, before they find the bugs
Codex uses your app on real iPhones the way people do (signed in, interrupted, impatient) and shows you what stands between a download and a paying user: confusing onboarding, broken edge cases, App Review red flags and screens an AI agent can’t use. Run it in your repo and it fixes what it finds.
Try:
Install our newest TestFlight build and go from first launch to the paywall as a new user. Count the taps and tell me where a real person would give up.
Install our top competitor from the App Store, go through its onboarding and paywall, and compare every step with ours.
Before I submit to App Review, check our app for account deletion, Restore Purchases on the paywall and a working privacy policy link.
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A 1-star review says the app freezes when uploading a photo. Reproduce it on my iPhone, find the cause in this repo and write the fix.
Play three users (a first-timer, someone who forgot their password and someone who says no to notifications) and report where each gets stuck.
Go through our sign-up and checkout as an AI agent would and list every screen where you couldn’t tell what to tap.
Try to break checkout: go back mid-payment, switch apps, come back and retry. Screenshot whatever goes wrong.
Run sign-up on my iPhone 13 and iPhone 16, then again with the biggest text size and Dark Mode. Fix whatever breaks in our layout code.
More ideas: Test iOS apps on a real iPhone
Get one task done across several apps
Codex moves between apps the way you do: it takes what it needs from one and finishes the job in another, from a single request.
Try:
Open my latest Hinge chat, work out what they’re into, find three date spots between us on Google Maps and suggest a time that’s free on my Calendar.
Grab the video and caption the client approved in our WhatsApp group and post it as an Instagram Reel.
Find the restaurant in my latest screenshot, check OpenTable for a table for 4 on Friday and send the booking to the group chat.
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Read the bug report a beta tester sent me on WhatsApp, reproduce it in our TestFlight build and reply with a screenshot of what you found.
Take the concert flyer from my screenshots, find two seats together on Ticketmaster and send the options to Sam.
Pull this month’s Uber and Lyft receipts from Gmail and add each one to my expense report in Expensify.
Order, shop and book in your apps
Codex shops across the apps you’re already signed in to, comparing prices, using your saved addresses and past orders, and booking the best option.
Try:
Check Amazon, Walmart and Target for the 6 things on my shopping list, find the best price for each and add them to the cheapest cart.
Reorder my usual Chipotle bowl on DoorDash (or Uber Eats if it’s cheaper) and stop at checkout.
Rebuild last week’s Instacart order from Costco, swap anything that’s out of stock and schedule it for Saturday morning.
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Find a table for 2 at 7:30 on Friday on OpenTable or Resy and book the best-reviewed one.
Price an Uber and a Lyft from home to JFK for 6 am tomorrow and book the cheaper one.
Order lunch for the team on DoorDash from the Thai place we liked, add everyone’s order from our Slack thread and stop at checkout.
Organize and clean up your iPhone
Codex can change the phone itself: your photos, Home Screen, Focus modes, notifications and settings.
Try:
Go through my photos, gather the screenshots, duplicates and blurry shots into a “Delete?” album and tell me how much space I’d free up.
Find every subscription in my App Store settings, flag the ones I haven’t opened this month and tell me what I’d save by cancelling.
Clean up my Home Screen: work apps on page one, games and social on the last page. Don’t delete anything.
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Get my spare iPhone ready for testing: delete our app, turn on Dark Mode and the largest text size, and switch the region to Germany.
Turn off notifications for every app I haven’t opened in two weeks, but keep TestFlight and GitHub.
Nothing to install. Nothing to hand over.
No Xcode. No paid Apple Developer account. No jailbreak
Nothing goes on your iPhone: Zeptap works over a USB cable and Bluetooth.
Your passcode never leaves your Mac
It’s stored in your Mac’s Keychain, and Codex never sees it.
Your screen never touches Zeptap’s servers
No Zeptap account, no relay: what’s on screen goes only to OpenAI, under your own ChatGPT plan or API key.
You stay in charge
Watch every tap from your Mac, stop any time, and have Codex check with you before it sends, posts or buys.
your Mac
CodexConnect Codex to your iPhone in minutes
Download Zeptap for your Mac (macOS 14 or later).
Plug in your iPhone and pair it over Bluetooth. Zeptap walks you through it.
Choose where you talk to Codex: in the Zeptap app, or in the Codex CLI or Codex in the ChatGPT desktop app on your Mac.
Use Codex in the Zeptap app
In Settings › Agents, Zeptap installs Codex and signs you in with your ChatGPT Plus or Pro plan. Then press ⌘L to chat (no extra AI subscription).
Connect the Codex CLI or ChatGPT desktop app to your iPhone (local MCP server)
Zeptap runs on your Mac as a local MCP server that gives Codex your iPhone. In Zeptap, open Settings › Connectors and click Add next to Codex, then start a new Codex session.
Prefer to edit the Codex MCP config yourself? Add this to ~/.codex/config.toml:
[mcp_servers.zeptap]
url = "http://127.0.0.1:47801/mcp"Use Codex on your Mac, in the CLI or in the ChatGPT desktop app. Codex cloud tasks run remotely and can’t reach a server on your Mac.
Download for MacConnect via MCP →
First hour free. Using ChatGPT instead? See ChatGPT on your iPhone.