Five tracks. 1,287 graded exercises. Solve 80% of the exercises across a track and earn a verifiable certificate — anchored to the specific hubs you completed, evidence-checkable by anyone with the URL.
Each track maps to a curated set of exercise hubs. The certificate snapshots the skills you demonstrated and the hubs you solved, so your credential is anchored to specific evidence — not a fuzzy claim.
Open any exercise hub and start solving. Code runs in-browser. Hints unlock progressively when you're stuck. Your progress saves automatically.
Solve 80% of the exercises across the curated hubs for a track. The "Earn" panel on your account page shows live progress against every track.
Hit Claim, get a verifiable URL, add it to LinkedIn with one click, download the Open Badges JSON for credential wallets, or print a clean PDF.
Every certificate URL returns a live page the holder cannot fake. Recipients cannot edit the page; only r-statistics.co serves it.
The cert lists the exact hubs solved. Hiring managers can click through to see what the candidate actually practised.
Each cert is also available as an OB3 JSON-LD credential, ingestible by Credly, Sertifier, and ATS resume parsers.
The exercises grade real R output — not multiple choice. Solving them means writing code that runs.
Attempting any exercise is free forever. Claiming a certificate is part of the Pro tier — see pricing. Free users can see live progress against every track and qualify, but claiming the credential requires a Pro subscription.
Each track is a curated set of exercise hubs. 80% of the total exercises across those hubs must be passed — graded against expected R output, not multiple choice. Hints are available; using them does not reduce your XP or block your certificate.
Your certificates remain valid. The earned credential is yours to keep — Pro access is required to claim a new cert, not to retain an existing one.
Yes. From your account, set any cert to Unlisted at any time. The verify URL will return 404 while unlisted; toggling back to Active restores it. Your earned credit and XP are unaffected.
Each cert records: the track ID, your display name at the time of minting (snapshot), the issue date, a public ID, and the URLs of hubs that served as evidence. No exercise code text is stored. See privacy for the full disclosure.
v1 ships with a public verify URL + Open Badges 3.0 JSON-LD. Cryptographic signing of the credentials (Verifiable Credentials with did:web) is on the v1.1 roadmap; the issuer DID document is already published at /.well-known/did.json.