Cycling through all six. Tap any point to stop.
Measured on six things
Unassisted JavaScript, TypeScript, and Python coding diagnostic and practice for developers.
Usability
63Free no-account test is one click from anywhere, and the /guides library is genuinely deep. But crypto-only checkout and small grey renewal text put real friction between a curious dev and a paid plan.
Screenshots
1 / 1
About this app
Unrust is a free, timed, unassisted coding skills diagnostic that helps developers measure and rebuild six core coding abilities: recall, debugging, finding the flaw, tracing, idiom/quality, and AI-slop detection. The 14-minute assessment runs in JavaScript, TypeScript, or Python with AI assistants and autocomplete turned off, giving you an honest snapshot of where you stand. After the test, you get a per-skill profile with bands from Sharp to Offloaded, a sure-vs-measured comparison, and a trace replay to see what you missed. A free account adds daily adaptive practice, a mastery ladder, XP and practice days, and a calm game layer. A subscription unlocks unlimited practice, a full drill library, focused workouts, saved trends, per-language views, and a 7-day interview pre-flight plan. Unrust is built for developers who want to keep their real coding skills sharp in an AI-heavy world.
Key features
- 114-minute unassisted diagnostic across six skills (recall, debugging, find-the-flaw, tracing, idiom, AI-slop detection) in JS, TS or Python.
- 2Per-skill band profile (Sharp → Offloaded) with a sure-vs-measured comparison and a trace replay of missed items.
- 3Free account adds daily adaptive practice, a mastery ladder, XP and practice days; subscription unlocks unlimited practice and trend tracking.
Target customer profile
Drawn from the product itself, not from a survey.
Demographic
Engineering leads and team managers assessing team skill health
Pain points
Hard to gauge individual unassisted coding ability across languages and skill areas
Primary needs
A lightweight, standardized way to benchmark and track skill trends over time
Scout Review
Written by AI from measured evidence, scored out of 100.
Unrust is a free, 14-minute unassisted coding diagnostic that scores six skills — recall, debugging, find-the-flaw, tracing, idiom and AI-slop detection — with AI and autocomplete off, then gives you a per-skill band and a trace replay. The site is fast (97 mobile / 100 desktop Lighthouse), the design is cohesive, and the free-first, no-account entry point is exactly right for a diagnostic. Paid tiers ($4.99 intro / $10.99 monthly, or $84/year) unlock unlimited practice and trend tracking. The two things holding it back are the crypto-only checkout and thin trust signals (no DMARC, no security page). For a developer who suspects their unassisted skills have quietly rusted, it's a genuinely useful mirror.
Measure by measure
Usability
63Free no-account test is one click from anywhere, and the /guides library is genuinely deep. But crypto-only checkout and small grey renewal text put real friction between a curious dev and a paid plan.
Design
71Cohesive dark theme with one disciplined blue accent, a hero radar chart that shows the product's output before signup, and clear pricing hierarchy. Held back by low-contrast radar labels and unfinished 'coming soon' social placeholders.
Speed
88Lighthouse mobile 97/100 (LCP 1.3s, CLS 0, TBT 78ms) and desktop 100/100. Genuinely fast, lightweight pages with no layout shift and no lag complaints in the evidence.
Security
74Strong header posture — HSTS, CSP, frame protection, nosniff, Referrer-Policy all set (10/12 checklist). Missing Permissions-Policy and DMARC, and no published SOC 2/ISO or security page found.
Accessibility
79Lighthouse a11y 100/100 and pricing readable without JavaScript are real wins. No published WCAG statement, and the low-contrast radar labels the visual audit flagged are a genuine gap automated checks miss.
Growth
63A timely, specific problem (unassisted skill decay) with a differentiated six-skill model and a B2B angle via team leads. Real wedge, but crypto-only checkout and a crowded 'learn to code' space cap the ceiling.
Improvement areas
- Crypto-only checkout (USDT/USDC/DAI) blocks most buyers — add card/Apple Pay.
- No DMARC record, no Permissions-Policy header, and no published security/trust page.
- Hero radar chart labels and percentages are low-contrast and hard to read.
- Footer 'X and LinkedIn coming soon' placeholders read as unfinished.
Design & Usability
Unrust's design is confident and coherent: a dark theme with a single blue accent, a hero radar chart that renders the six-skill output before you sign up, and pricing cards that clearly rank the plans. The 'How it works' three-column grid and repeating skill chips reinforce the taxonomy without bloat. Usability is nearly as strong — the free, no-account 14-minute test is one click from the nav, hero and footer, and the /guides library is a surprisingly deep set of practical code-review walkthroughs. The friction is at the money step: crypto-only checkout (USDT/USDC/DAI) and small grey renewal text make the paid path feel like a hurdle course for a tool that otherwise sells itself on low friction.
Speed & Security
Speed is the standout: Lighthouse mobile 97/100 with a 1.3s LCP, zero CLS and 78ms TBT, and a perfect 100 on desktop. Pages are light and snappy with no layout shift. Security is solid but not airtight — HTTPS enforced with HSTS, CSP, frame protection, nosniff and Referrer-Policy all present (10/12 on the header checklist), but Permissions-Policy and a DMARC record are missing, and there's no published SOC 2, ISO or security page. For an indie diagnostic tool that's a respectable posture; for the engineering-lead buyer it's courting, it's a gap worth closing with a short trust page.
Accessibility & Growth
Accessibility scores 100/100 on Lighthouse's automated audit, and the pricing page explicitly keeps plan details readable without JavaScript — both real, verifiable wins. The caveats are the ones automation can't catch: no published WCAG conformance statement, and the visual audit found the hero radar's axis labels and percentages low-contrast against the dark background, which is exactly the kind of thing a screen-reader user or a tired human will hit. Growth is the more interesting question. Unrust names a genuinely timely problem — skill decay when AI writes the code — and its six-skill taxonomy plus team-lead positioning give it a real wedge beyond the consumer test. The ceiling is set by a crowded 'practice coding' market (Codewars et al.) and a crypto-only checkout that narrows the funnel. The idea can grow; the distribution plan needs work.
Conclusion
If you've spent the last year letting Copilot and Claude carry your recall and tracing, Unrust is the cheapest honest audit you'll take this quarter — fourteen minutes, no account, a real per-skill read at the end. Take the free test, look at which band is Rusty, and only then decide whether the subscription is worth it. The product earns a look; the crypto-only paywall and missing trust page are the two things to fix before it earns a team's budget.
Suggestions for improvement
- Add a card or Apple Pay option alongside crypto — a crypto-only checkout is a hard stop for most engineering leads.
- Publish a short security/trust page covering data handling, auth and any audits; add a DMARC record and Permissions-Policy header.
- Raise the contrast on the hero radar chart's axis labels and percentages — it's the product's signature visual and currently hard to read.
- Ship or remove the 'X and LinkedIn coming soon' footer placeholders; unfinished social links undercut an otherwise polished page.
Alternatives comparison
Named competitors, point by point. Nobody paid to appear here or to be left out.
 Unrust |  Codewars | |
|---|---|---|
| Free entry point | Free 14-minute diagnostic, no account needed for first result | Free account with community katas across many languages |
| Core format | Timed, AI-off diagnostic + adaptive practice drills | Gamified community-created coding challenges (katas) |
| Skill measurement model | Six-skill bands (Sharp → Offloaded) with trace replay | Kyu/dan rank progression by challenge difficulty |
| Languages supported | JavaScript, TypeScript, Python | Many languages (JS, Python, Java, C#, Ruby, etc.) |
| Paid tier | $4.99 intro / $10.99 per 30 days, or $84/year — crypto only | Free core; paid plans for teams/enterprise |
| Team / B2B angle | Positioned for engineering leads assessing team skill health | Team plans for hiring/assessment and skill tracking |
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