01
What a clone costs in tokens
Every developer running coding agents has had the thought: I could point Claude Code at this and build my own in a weekend. AgentPeek is what that idea looks like finished: over a thousand Swift files and more than a hundred thousand lines of native macOS code covering twenty-five agents, each with its own session format, hook channel, usage records, and edge cases that only show up after weeks of real use.
Driving an agent through even a rough clone means days of long sessions. On a subscription, those sessions drain the same 5-hour and weekly windows you need for real work; on API billing, they are dollars per hour, every hour.
Put API numbers on it. A focused day of agent-driven development moves tens of millions of tokens once revisions, rereads, and cache traffic are counted, and at Claude API list prices that is a daily bill that runs well into the hundreds of dollars; heavy-usage reports from tools that price local logs at API rates show exactly that. AgentPeek is months of those days. Replaying a 1:1 clone on API pricing lands in the thousands of dollars, and even a stripped-down weekend version that monitors one agent costs hundreds before it works. The AgentPeek license is $15, one time. A serious build session spends that before the notch layout stops flickering.
02
Maintenance is the real cost
The build is the cheap part. Coding agents change constantly: CLIs rename, session logs move, hook APIs gain and lose fields, and a new agent worth tracking ships every few weeks. AgentPeek has shipped 88 releases across 46 separate days since launch, each one in the public release log. That cadence is what it takes to keep twenty-five integrations honest.
A homemade clone works until the first breaking change, then it is your problem again, and you pay for it twice: once in tokens to build it, then again in tokens every time an agent update breaks it. Those maintenance sessions bill exactly like the build did, month after month, on top of your own evenings spent running them. The $15 license buys the stream of fixes, not a snapshot, and the ongoing maintenance bill is AgentPeek's to pay, not yours.
03
One-time, under twenty dollars
AgentPeek is a one-time purchase: $15 for one Mac at the limited-time price, regularly $19, with 2-Mac and 3-Mac licenses alongside. Future updates are included and there is no subscription. A free 3-day trial runs first, so the decision is made with the app on your notch, not from screenshots.
Run the time math too: if an hour of your time is worth anything at all, the hours spent building and then babysitting a clone dwarf the license many times over.
04
When building your own makes sense
If the project is the point, build it: writing a session watcher is a great way to learn how these agents work under the hood. Good free tools cover slices of this too, and the honest comparisons are on their own pages: ccusage for usage reports and CodexBar for menu bar limit meters. But if what you want is a working monitor rather than a side project, buying the finished one is the cheap option.