Comperly Skills
Skill Labs

Practice with no right answer.

None of these skills have a multiple-choice answer, so none of these labs pretend to. Each is a brief, a time budget, and a definition of done you can check yourself.

9 labs · 5 free to try right now · no account needed for those.

  • FreeStarterLearn AI45 min

    Make a model return valid JSON, every single time

    A prompt that survives twenty runs without one malformed response.

    Write a prompt that extracts a name, a date and an amount from messy pasted text and returns them as JSON. Then run it twenty times on twenty different inputs — including two that contain no date at all, and one that contains three.

    You are done when

    • All twenty responses parse without an error.
    • The two inputs with no date return null rather than a guess.
    • The input with three dates returns the one your prompt says it should, and your prompt says which.
  • FreeCoreLearn AI60 min

    Chunk a PDF badly, then fix it

    A first-hand understanding of why retrieval usually fails.

    Take any PDF with headings and tables. Split it into fixed 500-character chunks and search it. Note every question it gets wrong. Now split it on headings instead, and search again.

    You are done when

    • You have written down three questions the fixed-size version answers wrongly.
    • At least two of the three improve with heading-based chunks.
    • You can say in one sentence why the third did not.
  • With the courseStretchLearn AI50 min

    Break your own agent before somebody else does

    A prompt-injection attack you wrote, and the fix you shipped.

    Build a tiny agent that summarizes a web page. Then write a page containing instructions aimed at the agent, and get it to ignore its own task. Then stop it happening.

    The checklist that tells you when this is finished comes with Learn AI.

  • FreeStarterMake Money Online40 min

    Write the one-page offer

    A priced, specific offer a stranger could buy without a call.

    Write one page describing exactly what you will do, for whom, by when, and for how much. No "packages". No "starting from". One offer, one price, one deadline.

    You are done when

    • Somebody outside your field can read it and say what they would get.
    • It contains a number for the price and a number for the turnaround.
    • You have removed every sentence that would be true of any freelancer.
  • With the courseCoreMake Money Online90 min

    Send twenty proposals in one sitting

    Twenty sent, tracked, with the reply rate written down.

    Twenty real proposals, each opening with one specific sentence about that particular client. Track which get opened, which get replies and which get work.

    The checklist that tells you when this is finished comes with Make Money Online.

  • FreeCoreStart a Startup120 min

    Ask thirty people about a problem without mentioning your idea

    Thirty conversations that could not have flattered you.

    Talk to thirty people who have the problem you think you are solving. Do not describe your solution once. Ask what they did the last time it happened, and what it cost them.

    You are done when

    • Thirty sets of notes exist.
    • Not one of them contains your idea.
    • You can name the three things more than half of them said.
  • With the courseStretchStart a Startup60 min

    Try to kill your own idea in an afternoon

    A written case against your idea, and your answer to it.

    Write the strongest possible argument that this business will not work. Then answer it with evidence you already have — not evidence you intend to gather.

    The checklist that tells you when this is finished comes with Start a Startup.

  • FreeStarterFaceless YouTube35 min

    Rewrite one hook five ways

    Five openings for the same video, and a reason for picking one.

    Take a video idea and write the first thirty seconds five different ways — question, claim, story, contradiction, and straight to the point. Read all five aloud.

    You are done when

    • Five openings exist, each under 90 words.
    • You have read every one aloud and timed it.
    • You can say in one sentence why the one you chose beats the other four.
  • With the courseCoreFaceless YouTube75 min

    Design ten thumbnails for one video

    Ten thumbnail-and-title pairs, judged at phone size.

    One video, ten different thumbnails, each paired with its own title. Then shrink every one to the size it appears on a phone and look again.

    The checklist that tells you when this is finished comes with Faceless YouTube.

The locked labs come with their course

Each one belongs to a track. Buy the track and its labs open, along with the modules that teach you how to do them.

See the four tracks