What are the best electricity comparators in Spain?

There are a lot of electricity comparators in Spain and they all look similar from the outside. Under the hood they work very differently, and that directly affects what you see: which tariffs show up first, which ones quietly don't appear, and who eventually pays whom.

In this article we go through the main players, with their real differences. No invented rankings, no "the winner is...". Each tool serves a different kind of user, and toward the end you'll find a newer alternative, Zorrito, that's taken a different route: automatic bill reading, no email or phone required, and at the moment no commissions.

How comparators make money (this matters)

Before talking about each one, it helps to understand the three business models:

1. Public / non-profit. The official CNMC comparator and the OCU simulator. They don't charge commissions to electricity suppliers. Their only goal is to inform.
2. Commission on contract. The model of nearly every private platform. When you sign up through them, the supplier pays them a commission. This isn't bad in itself, but it conditions which tariffs appear first (the ones paying higher commission usually get better visibility).
3. Advisory plus management. Platforms like Papernest don't just compare, they also handle the switch for you, often across multiple utilities at once.
4. No commission (for now). The case of Zorrito, which right now doesn't charge the user OR the suppliers. The comparison is what it is, without "featured" tariffs paid for by anyone.

When a comparator is "completely free", usually someone is paying them (the exceptions are the public ones and pre-commercial projects). If you want pure neutrality, start with the public ones. If you want speed and end-to-end management, the private ones make sense.

The neutral and official comparators

1. CNMC Comparator

This is the official State comparator, run by the Comisión Nacional de los Mercados y la Competencia, Spain's national markets authority. It has no commercial agreements with any supplier. You'll find it at comparador.cnmc.gob.es.

How it works: you can scan the QR code on your bill so it autofills the data, or enter the details manually. It shows all available free-market offers plus the regulated PVPC tariff.

Strengths: absolute neutrality, full market coverage, no ads, no paid "featured offers".

Limitations: it doesn't show exclusive tariffs that some companies offer only through private channels, it doesn't monitor your prices after you've signed up, and the interface isn't going to win any design awards.

Best for: anyone who wants a 100% impartial reference point. If a private offer looks very different from what you see on the CNMC, read the fine print twice.

2. OCU simulator

Spain's main consumer association (OCU, Organización de Consumidores y Usuarios) runs its own simulator. It's an independent tool, funded by OCU member fees. Basic access is free, and there's an optional subscription for other content on the organization's site.

How it works: you enter your consumption and your profile (average home, with solar panels, with EV, with gas heating) and it compares practically every tariff on the market for supplies up to 15 kW.

Strengths: editorial independence, customizable profiles, consumer-defence perspective.

Best for: anyone wanting a second opinion to the CNMC from a pro-consumer body.

The large commercial comparators

3. Selectra

Selectra is a multinational platform operating in at least nine countries (Spain, France, Italy, Portugal, the UK, Mexico and others). In Spain it compares electricity, gas, internet, mobile, alarms and insurance.

How it works: they have an online comparator and, more importantly, a phone team that calls you and runs a personalised "savings study". That phone leg is the core of their model.

Distinctive feature: they publish the Semáforo Selectra (Selectra Traffic Light), a visual indicator that says whether the wholesale electricity price for the day is expensive (red), medium (yellow) or cheap (green). Useful as a daily reference even if you don't sign anything with them.

Strengths: strong phone support, lots of editorial content, multi-country presence.

Limitations: an outbound-call model that not everyone enjoys. The selection of tariffs shown depends on which companies are collaborating with them at any given time.

4. Kelisto

Kelisto is a multi-vertical comparator (energy, mortgages, bank accounts, insurance, broadband and mobile) based on a form.

How it works: they use a single average consumer profile to estimate costs across all tariffs, which makes comparison fast but less precise than an analysis based on your real consumption.

Strengths: speed, clean interface, broad coverage.

Limitations: their "complete" coverage depends on the commercial deals they have at any given time. Using an average profile can hide tariffs that would be better for your actual consumption pattern.

5. Roams

Roams has comparators for electricity, electricity plus gas, and other services like telecoms. Model similar to Kelisto: form, estimate, ranking based on available tariffs.

6. TarifaLuzHora

TarifaLuzHora is best known for showing the hourly price of electricity (PVPC) for today and tomorrow on a chart. It also has an integrated tariff comparator. There's a corporate connection with Selectra according to their own communications.

Best for: PVPC users wanting to know what time to run the washing machine today.

7. TarifasGasLuz

TarifasGasLuz takes a similar approach: hourly pricing, comparator, and a lot of editorial content on bill anatomy, tolls and so on.

The "end-to-end management" comparators

8. Papernest

Papernest is more than a comparator. They manage the switch for you, not only for electricity but also for gas, water, internet, phone and home insurance. They work with Endesa, Iberdrola, Holaluz, MásMóvil and others.

How it works: they call you, run a study, and if you decide to switch they sign contracts, cancel and transfer on your behalf. The service is free for the user (they earn commission from the supplier).

Strengths: very useful when moving home or moving country. Phone support available, and according to user reviews on Trustpilot they have English-speaking agents in some cases (might depend on which one picks up).

Limitations: a phone-heavy model, not for everyone. As with any intermediary, always check the final contract directly with the supplier before signing.

Expat-focused comparators

9. Compare In Spain

Compare In Spain targets foreign residents who'd rather handle their utilities in English or another non-Spanish language. It's free and works by sending your current bill through their contact form so an agent can analyse it.

10. ¡Sí! Compare

¡Sí! Compare markets itself as one of the first comparators in Spain operating in English. Same model: covering the language gap for people who don't manage in Spanish.

The "upload your bill" comparators

Some comparators have specialised in reading the bill you upload instead of asking you to fill out forms. It's faster and more faithful to your actual consumption, because they take the real kWh figures straight from the bill.

11. Menos de Luz

Menos de Luz is operated by Le Pair Consulting S.L. It lets you upload a PDF bill or enter data manually, and they keep methodology and commercial-transparency pages explaining how the rankings work and where their commission comes from. Refreshing to see.

12. Simulador FacLuz

Simulador FacLuz also follows the upload-or-manual-input route, estimating real monthly cost.

13. Zorrito

Zorrito is the most recent player on this list and the only one, right now, with no commissions. It works by uploading your bill (PDF or photo), and has one important quirk: it strips your personal data automatically (name, address, DNI, CUPS) before any processing. No email or phone required to run the comparison.

How it reads the bill: an AI-based system extracts your kWh per time band, your contracted power and the billed concepts directly from the image or PDF. You don't have to fill in forms or pick a "standard profile": it uses your real consumption.

Three things that set it apart:

• No commissions (for now). That means the order of the tariffs in the ranking isn't driven by who pays them more, but by pure calculation against your consumption.
• Privacy by design. Personal data is stripped before processing, not after. The bill itself isn't kept on servers.
• Analyses, not just compares. Includes an explanatory bill analysis that flags common errors (oversized contracted power, expired discounts, chronic estimated readings, unregulated charges) without you needing to know electricity.

Best for: users who value privacy over phone support, those who want their real consumption used rather than an average profile, and people who'd rather have a direct tool than a sales call. Also for expats: the tool works in Spanish AND English.

Honest note: Zorrito is a recent project, it doesn't have Selectra's track record or Kelisto's press coverage. What it does have is a different model from everyone else, and as long as commissions aren't introduced, the guarantee that the ranking isn't skewed by commercial interests.

Summary table

Which one should I use?

There's no universal best. Depends on what you need:

• I want the most neutral reference possible: start with the CNMC and use it as the ground truth against everything else.
• I don't want phone calls: avoid Selectra and Papernest. The online options with no call are Kelisto, Roams, Menos de Luz and Zorrito.
• I want a ranking with no commercial bias: CNMC always, and among the private ones Zorrito while it stays commission-free.
• I'm an expat and prefer English: Compare In Spain or ¡Sí! Compare, and consider Papernest if you also need internet and water sorted at the same time.
• I want my real consumption used, not an average profile: the ones that accept bill upload (Menos de Luz, Simulador FacLuz, Zorrito).
• I'm moving and need to manage several services at once: Papernest.
• I'm an OCU member, or I want a pro-consumer perspective: OCU.
• I want to know the kWh price today: TarifaLuzHora or TarifasGasLuz.

What no comparator will tell you

Whichever one you use, keep three things in mind:

1. The ranking depends on the tariffs the comparator has loaded at that moment. It's not the entire market in absolute terms.
2. Commissions affect the order of appearance in pretty much every commercial platform. The "number 1" tariff is not always the mathematically cheapest for you.
3. The price shown is the price at the moment of consultation. If your tariff has an annual review, or you're on an indexed product, what you see today is not what you'll pay six months from now.

So whatever comparator you use, check the contract directly with the supplier before signing. And read how to understand your bill so you can spot the five typical errors yourself.

FAQ

Which is the most reliable electricity comparator in Spain? If "reliable" means neutral, the CNMC one. If it means fast and personalised, depends on your profile. There's no universal winner.

Are comparators really free? For the user, yes. But commercial ones earn a commission from the supplier when you sign up through them. The public one (CNMC) is state-funded, and OCU runs on member fees.

Why does each comparator give me a different result? Because they use different tariff databases, different consumption profiles, and different ranking criteria. The sensible move is to cross-check at least two: one neutral (CNMC) and one commercial.

Can I compare without giving my email? Yes, on the CNMC, on Zorrito and a few others. Selectra and Papernest typically want at least a phone number so they can call you.

What happens if I sign up through a comparator and then change my mind? You have 14 days of right of withdrawal from the signature date, regardless of the channel. After those 14 days, the contract terms apply.

Key concepts

• Zorrito electricity comparator
• Analyse your bill
• How to switch electricity supplier
• How to understand your electricity bill
• PVPC vs free market

Sources

• CNMC, Energy Offer Comparator
• OCU, electricity and gas tariff simulator
• Selectra, tariff comparison
• Kelisto, energy comparator
• Roams, electricity comparator
• TarifaLuzHora
• TarifasGasLuz
• Papernest Spain
• Menos de Luz
• Compare In Spain

Last updated: 10 May 2026 · Author: Zorrito Research · Analysis based on public information from each platform's official website at the date of publication.