← Viva Grafix · WorkStart a project →

Enerva — Domestic energy bill-audit platform, designed and built by Viva Grafix

Platform · Web — Studio product, 2026 · Free audit
Enerva

Scan the QR on your Spanish electricity bill and see exactly where you overpay — from a platform that will tell you not to switch when that’s the honest answer.

enerva.dsl4.com
Enerva — live site, designed and built by Viva Grafix
ProjectEnerva — energy bill audit & concierge
ScopeProduct design · Audit engine · Build
MarketSpanish households · Canary Islands first
ModelFree audit — commissions disclosed in €/kWh
YearCanarias · 2026 · Demo live

An energy adviser with its incentives in writing.

The Spanish energy-switching market runs on cold calls and hidden commissions, so we built the opposite. Enerva reads the legally-mandated QR on any Spanish electricity bill — or connects to official Datadis hourly consumption data — and audits exactly where a household overpays. Sometimes the answer is a better tariff; often it is simply "lower your contracted power and stay". Enerva says so.

Every commission is disclosed in €/kWh, and cold-calling is banned in code, not in a values slide. Trust is the product; the demo is live.

What we designed & built

The audit is the front door.

A free, honest audit earns the right to a switching concierge — in that order.

01

Scan and see

Bill QR decoding (jsQR against the BOE field layout) or Datadis hourly data in; a clear, itemised picture of the bill out.

02

Honest by default

The audit happily concludes "don’t switch" — the recommendation engine has no thumb on the scale.

03

Reports worth keeping

Full PDF audit reports, an 8-state consent state machine, and GDPR handling built for energy data.

Enerva — free electricity-bill audit hero with the 'how we make money' transparency box
The hero we wrote leads with the promise — find what you overpay, free — and the 'cómo ganamos dinero' box keeps it honest.
The tech

Under the hood.

Honesty enforced as architecture, and money math with no room for vibes.

Next.js 15React 19TypeScript strictTailwind v4 + shadcn/RadixPrisma 6 / PostgresNextAuth 5next-intlStripeZodVitest + PlaywrightVercel
01

The publish gate

A single chokepoint withholds any commissioned recommendation that lacks its €/kWh disclosure — the ethics policy is a compile-time constraint, not a promise.

02

Deterministic audit engine

The numeric path is a pure, network-free engine: five named rules, Decimal-only money arithmetic, and no LLM anywhere near the numbers.

03

Swappable ports

Datadis, bill decoding and Stripe sit behind Live/Mock integration ports — the whole platform runs and tests without touching a real utility.

On the work · Viva Grafix, 2026

Enerva bets that in a market famous for tricks, the most disruptive feature is disclosed incentives — an audit engine that can’t be sweet-talked, in a product that would rather lose a commission than a user’s trust.

Viva Grafix · Tenerife · 2026