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Hone

Hone your skills,
one question a day.

AI can write code now. The people who get ahead are the ones who can read it, spot its mistakes, and explain it.

That is the skill you build here, a few minutes a day, starting from wherever you are, even if that is zero.

Got a young one? Try the free kids playground →

Start here. Which one is you?
It is for a kidA free playground with Hafs the cub: build a path with blocks and watch it run. No account, nothing collected.Hone Kids · free playground

Not sure? Pick the closest. It only decides where we begin; a short check corrects it, and you can change track or path any time.

Try it. No account needed
Look anything upno account needed

Dictionaries, closures, JOIN, recursion, git stash, VLANs: 701 short lessons in plain words, each with a worked example that runs.

Or browse every lesson, in teaching order →

Who it is for, and what it builds

Never written a line, or years into the job. Beginners get a short lesson before each challenge and a coach that asks the next question instead of handing over the answer. Experienced developers get real tests, no hand-holding, and a level that moves with them, which is why they are the ones who pass it on.

  • Read code you did not write and say what it does. The interview question people freeze on.
  • Catch the bug the AI missed, because you have met the trap before and know where to look.
  • Explain your thinking out loud. The line between using a tool and understanding it.
  • A habit that holds. One question a day, a streak worth keeping, progress you can actually see.
Why learn this when AI writes code

AI writes the code. You still have to know if it is right. The people who get stuck now are not the ones who cannot type code; they are the ones who cannot tell why it broke, or explain in an interview what it does.

Hone is built for exactly that gap. Nothing here writes code for you. Real tests decide whether your code passes, the coach asks questions instead of handing over fixes, and your progress ledger only ever records what you actually did.

Ten tracks, one habit
The gap nobody fills

You learn a loop. Then a dict. Then a sort key. And then you stare at a real system and have no idea which of them to reach for. That is the hardest part of learning to code, and it is where most people stall.

So every challenge here ends with where this shows up: the real thing that uses the exact idea you just practised. The same puzzle is how a shop checks its invoices add up, how a calendar finds a free slot, how a search box scans a huge log file, how your browser remembers the last pages you were on. You do not just learn the tool, you learn what it is for.

The certificate, and what stands behind it

Meet a fixed bar on a track and Hone issues a certificate. The same bar for everyone: readiness in the top band, topics held under spaced recall, and problems solved without a hint. Every number on it was recorded as the work was graded, so nothing on a Hone certificate is typed in by the person receiving it.

A credential ID anybody can checkPrinted on the certificate as HONE-PY-0000-0000 and looked up at honecoding.com/certificate. No account, no sign-in, nothing to send us: type the id and the issuer answers.
Signed, so it cannot be editedThe same certificate is issued as an Open Badges 3.0 credential, which is a W3C Verifiable Credential, signed with our key. Change one character of it and the signature stops matching, on anybody's machine, without asking us anything.
Your name, as it was on the dayYou choose the name printed on it, separately from your public handle. It is frozen when the certificate is issued and does not follow later profile edits, so a certificate always says what it said.
Straight onto LinkedInOne button fills in the certification name, the issuer, the issue date, the credential id and the verification link, in the fields LinkedIn expects them in.
The evidence, not just the claimEvery certificate links to a public record of the counted work behind it: topics held under recall, problems solved unaided, days practised. A hiring manager can read the working.
What it does not claimHone is not an accredited body, does not proctor exams and does not check government identification. A Hone certificate attests to counted work done on an account. It says exactly that, on the certificate, because a credential that overstates itself is worth less than one that does not.
What is different here
  • Watch your code run. Values appear beside the line that produced them. Ladder rungs draw a timing diagram. Queries show their rows.
  • A coach that asks, never tells. Stuck on a loop? It says “What does your counter hold the second time round?”, not the fix.
  • Your own path to the answer. Every version you ran is kept, so you can see what changed when it finally went green.
  • Help that fits your level. Beginners get a lesson before each challenge. Experienced people get pointed, not taught.
  • Hafs. A small lioness who watches you work, brings your hints over herself, and only ever says true things about you.
  • Proof a hiring manager can check. A public page of your verified work, résumé lines counted from it, and a job-ready checklist that counts itself. Every number comes from graded answers; nothing is typed in.
  • Lessons you can read right now. Short lessons in plain words, each with a worked example that runs, open to anyone with no account, and every one of them ends in a box you actually type into.
  • Something to run on every stage. Every stage of every curated path has something to read, something to answer and something to write, including git, the terminal and the switch console, where what you type is graded on the state you left behind.
  • A credential a stranger can check. A certificate with a credential id, a signed Open Badge, an add-to-LinkedIn button, and a page that says plainly what it attests to and what it does not.
How it works
  1. One question a day on the thing you are closest to forgetting.
  2. One challenge on the same idea. Real tests decide if it passes.
  3. Keep going when you want to; one a day is the minimum, not the limit.
Keep your progress

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Where are you starting from?

There is no wrong answer. It only decides where we begin; a short check comes next and corrects it.

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What do you want to practice?

Pick the one you want to get good at; every track gets the same care. You can change this any time in Account.

One last thing

Pick your username

This is the name friends see when you practise together. Letters, numbers and underscores; you can change it later.

Free during beta. Sign in with Google or email to keep your progress on any device; without it, it stays on this one.

Lessons · For kids · About · Your level · Privacy · Terms
Hone
Where you start

This moves as you practice, up and down. It measures, it does not grade you.
Honeplacement
Where are you now

…

Eight quick questions. Nobody sees this but you;
it only decides where you start.
Hone Rank1 XP0 ✦ 0 days
Today's questionmultiple choice

Quick questions to recognise an idea. Your first counts for today; extras are optional practice.

…

Today's one is done. Anything more is your choice.
0 answered · 0:00
Today's puzzleeveryone gets this one

One question a day, the same for everybody on this track. Your week is squares only, so sharing it gives nothing away.

Today's challengecode editor

Write real code and run it against tests. This is the hands-on work, and it earns more than a question.


    
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When you are done, all of this will be true

        
    
      
    
      
    
        
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      Switch>a practice switch, nothing here can break
      
        
      
        
      
          
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        Stuck at the prompt? Type ? and the switch will list what it accepts.
      
      
    
      
    
    
      
      
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      Same idea, one step harder, or the next weakest topic.
    
      
    
    
      
    
    
      
    
      
  
      
  
      

  
      
  
      
    
    
      Look it upsearch everything
      
    
      
      
      
      
    
      
    
      Pathsa route to follow
      
    
      A path is the order to learn things in. Follow one and You always shows your next step; every topic still counts wherever you meet it.
      
    
      
    
      Explorepick a topic
      
    
      Tap any topic to practise it now. Each shows how you've done on it. { } means it has a coding challenge too.
      
    
      Python quick reference: every topic on one page, one line each, to read without leaving your place.
      
    
      
    
      Your streak, level and the full record of where you stand live in You.
      
  
      
  
      

  
      One question a day is the minimum, not the limit.
      
    The coach gives hints, never answers.
    
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