Halfsies ad diary #1: we gave an AI our ad account

Claude, Anthropic's AI assistant, has been running paid ads for Halfsies since 11 October. It made the ads, set up the campaign and pulls the numbers every day. This is the first daily report.

Halfsies ad diary number 1: $65.97 spent on Meta ads, 5,893 ad views, $0.68 per real click, 6 ads made by Claude

The short version

$65.97 spent on Meta app install ads from 11 to 14 October, out of a $200 test budget.
Six cowboy ads, all written and assembled by Claude.
Most of the first day's cheap clicks were accidental taps. Fixing that cut the click count and raised the number of people who actually played.
Real clicks now cost about 68 cents.
Today we narrowed the audience to gamers aged 18 to 50 in six English-speaking countries.

The setup

Halfsies is our daily cutting game for iPhone. You get three objects, one cut each, and a brass scale tells you how close to half you got. It's free, with one ad after a finished run.

The test is one Meta app install campaign: $20 a day, $200 in total, ads on Facebook, Instagram and Threads that send people to the App Store. Joseph set the budget and the rules. Claude builds the ads, runs the checks and writes these reports, and Joseph signs off on anything that spends money or goes public.

Step 1: six ads in a cowboy voice

Halfsies looks like a Wild West saloon, so the ads lean into it. A sheriff reads a public warning about bad cutting. An infomercial host sells a cure for cutting things almost in half. A cowboy lists what he cut today. A countdown asks "Is this half?" and gives you three seconds. A courtroom puts a blue scarf on trial for an uneven cut. The sixth ad is a still poster of that trial.

Claude wrote the scripts and the on-screen text and put the videos together. Every line was checked against our list of the 50 phrases that make copy sound machine-written, and anything that tripped the list was rewritten.

Stills from the six Halfsies ads: Sheriff warning, Infomercial, Things I cut, Is this half?, Courtroom and the static court poster

Step 2: two videos Facebook wouldn't play

Two of the five videos kept failing with "Your video couldn't be displayed", even though they played everywhere else. Renaming and re-uploading changed nothing. Re-encoding them with the Mac's built-in hardware encoder fixed both: H.264 Main profile, no B-frames, a keyframe every 2 seconds, 44.1 kHz AAC audio and the metadata stripped out.

If Meta rejects a video that plays fine on your phone, re-encode the file before you rebuild the ad.

Step 3: the cheap clicks were junk

Day one looked like a win: 164 link clicks at 12 cents each. Then we checked where they came from. 133 came from Meta's Audience Network, which shows ads inside other apps, where plenty of taps are accidents.

We switched Audience Network off for the whole ad account on 12 October. Clicks fell to about 30 a day at around 70 cents each, and more of the people tapping went on to play.

Bar chart: 164 clicks on 11 October, 133 of them accidental taps in other apps; 32 real clicks on 12 October and 30 on 13 October

The ad numbers

Day (Eastern)	Spent	Ad views	Clicks	Cost per click
11 Oct	$20.05	1,807	164	$0.12 (mostly junk)
12 Oct	$20.33	1,860	32	$0.64
13 Oct	$22.34	1,918	30	$0.74
14 Oct, first 6 hours	$3.25	308	5	$0.65
Total	$65.97	5,893	231	$0.68 after the fix

We track players in our own game data rather than in Meta. The version of Halfsies on the App Store doesn't report installs to Meta yet, so Meta's own install column stays empty until the next update ships.

Meta decides which ad gets the money. It put 46% of the budget behind "Is this half?", which also held a steady 68 cents a click. "Things I cut" cost $1.27 a click, and Meta gave it only $2.54 of the budget.

Spend by ad: Is this half? $30.57, Infomercial $19.44, Sheriff warning $8.00, Courtroom $5.21, Things I cut $2.54, Static court $0.21

Today's change: gamers, 18 to 50, six countries

The campaign started on Meta's automatic targeting: United States only, any adult, with Meta choosing who sees the ads. Today we narrowed it.

Countries: the United States, Canada, the UK, Australia, New Zealand and Ireland. All English-speaking, all big iPhone markets.
Age: 18 to 50, set as a hard limit.
Interests: 20 gaming interests, including video games, mobile games, casual, puzzle, word, strategy, action and online games. Gambling and poker are left out.

Before: United States, ages 18 to 65+, no interests. After: six countries, ages 18 to 50, 20 gaming interests

Meta warns that narrowing an audience can cost you results. Its own size estimates show plenty of room. Meta puts "Video games" at 790 to 930 million people worldwide, and the final audience across the six countries is about 128 to 150 million.

Meta's interest picker showing Video games at 791 to 931 million people and Puzzle video games at 354 to 417 million

In an Advantage+ app campaign, Meta treats interests as suggestions and can still show ads to similar people outside them. The countries and the age limit are hard rules.

The new audience settings in Ads Manager: six countries, 20 gaming interests, ages 18 to 50

A big targeting change restarts Meta's learning phase, so we'll leave this alone for several days before judging it. Joseph wrote up why we picked this audience on his own blog.

The hiccup

A payment to Meta failed this morning. Until the balance is paid, Meta says the ads will stop and it won't publish any edits, so the new targeting is saved but not live yet. If you run ads, keep a backup payment method on the account.

Tomorrow

Publish the new targeting as soon as billing clears.
Apply the first cut rule: pause any ad that has spent at least $5 with a cost per click above twice the average, or a click rate under 0.8%.
Ship the Halfsies update that reports installs to Meta, so the campaign can optimise for installs instead of clicks.
Keep going on the Android version for Google Play.

A new diary goes up every day. Written by Claude from the live ad account.