Cittopia vs SDSN — three differences that matter

The most common question we get from journalists and academics is: how is The Pulse different from the SDSN European Cities SDG Index? It's a fair question. Both are composite urban indicators, both cover European cities, both are aligned with the UN SDGs, and both publish their methodology openly. From a distance they look like competitors.

They aren't, really. They're complements that were built for different audiences^[4] with different success criteria. This piece walks the three differences that actually matter — and where each tool is the right one to pick up.

The two tools, in one table

Difference #1 — Audience and reading time

SDSN's index is built for someone who's going to spend 45 minutes with the annual report. The report explains the methodology, contextualises the rankings, presents case studies. It's research-grade output, designed to be cited in academic papers, parliamentary debates, and ministerial briefing notes. The audience is fluent in SDG framework jargon — "indicators 11.6.2" and "Goal 16.7" are part of the working vocabulary.

The Pulse is built for someone who has 90 seconds. A citizen googling their city. A mayor's chief of staff prepping for a council meeting. A journalist looking for one number that anchors a story. The methodology is published openly (and we recommend you read it), but the page works without the methodology.

SDSN measures what a research community has agreed matters. The Pulse measures what a citizen would notice if it changed.

— Cittopia methodology white paper, v0.1

Neither audience is more important than the other. But each tool optimises for its audience at the expense of the other. SDSN's PDF is unsuitable for the citizen-on-mobile case. The Pulse's at-a-glance card is unsuitable for the cite-in-a-paper case. We point researchers to SDSN regularly. We hope SDSN points administrators and citizens to The Pulse.

Difference #2 — What gets measured, and the Listening Score gap

SDSN's index hews tightly to the official SDG indicator framework. SDG 16 (Peace, Justice, Strong Institutions) is represented by voter turnout, corruption perception, and homicide rate^[5][3]. These are good indicators — comparable across countries, internationally agreed, methodologically defensible.

They're also coarse. Voter turnout tells you whether people show up at election time. It tells you nothing about whether the city responds when those same people file a comment on a tram-line consultation. Corruption perception is a survey of opinion. It tells you nothing about whether decision documents actually cite citizen input.

The Pulse adds a custom dimension — the Listening Score — that measures back-end responsiveness directly. Five components: reach, diversity, response time, loop-closure, decision trace. This isn't a substitute for SDG 16 indicators; we use them too. It's an additional axis that catches a different signal.

The honest trade: the Listening Score is harder to compute at scale, depends on cities being active on Cittopia for full data, and is in v0.1. SDSN's SDG 16 indicators are battle-tested. If you need internationally-comparable, methodologically-conservative figures, use SDSN. If you need a forward-looking signal of how the city is currently behaving, use The Pulse.

Difference #3 — Scope and granularity

SDSN covers the major European cities. The 2023 European Cities SDG Index covered ~80 cities — mostly capitals and largest regional metropolises. This is appropriate for an annual benchmark publication; sampling the largest 80 captures most of the economic and population mass.

The Pulse extends coverage to mid-tier cities, regional capitals, and (in v1.0) to NUTS-3 regional aggregations. The pilot covers 30 cities at v0.1; the roadmap targets 500+ at v1.0. The geographic distribution is also more permissive — we cover candidate-country capitals (Türkiye, Western Balkans) as first-class entities rather than footnote cases.

Why the difference? Because the citizen of Bursa or Łódź or Sofia needs the same indicator readability the citizen of Warsaw or İstanbul gets. SDSN's audience doesn't immediately need Łódź in the dataset; The Pulse's audience does, because the citizen of Łódź is one of the users.

Where the two tools complement each other

An ideal workflow uses both:

1. Start with the Pulse for a quick read of any specific city — public profile, 9 dimensions, sister-city ties, citizen engagement signals.
2. Cross-reference SDSN's annual ranking for academic-grade peer comparison if the city is in their sample.
3. Use both methodologies' open documentation if you're doing original research — different normalisation and aggregation choices produce different results from similar inputs, and seeing both is informative.
4. Quote SDSN if you need the more conservative, multilaterally-vetted number for a press article or policy brief.
5. Quote the Pulse if you need the more responsive, granular, citizen-readable signal.

This isn't a polite framing for the sake of avoiding competition. SDSN's methodology team includes some of the people who literally wrote the OECD Handbook on Constructing Composite Indicators. Their work is excellent. The Pulse isn't trying to do their job; it's trying to do a different job — the citizen-readable, administrator-actionable, weekly-refreshable urban indicator that nobody else publishes in that form.

Where we directly disagree

Two specific methodology choices where The Pulse departs from SDSN, with reasons:

1. Geometric vs arithmetic aggregation. SDSN uses arithmetic mean within SDG goals. We use geometric mean within Pulse dimensions. Geometric mean penalises imbalance: a city that's brilliant on environment but terrible on housing scores noticeably lower than the arithmetic average would suggest. We think that's the right signal at the dimension level — a city with one dimension catastrophically broken shouldn't be able to compensate by being slightly above-average everywhere else. SDSN's choice is more conservative; ours is more critical.

2. Citizen participation framing. SDSN uses SDG-aligned proxies (voter turnout, trust survey). We use a custom Listening Score plus those same proxies as triangulation. We think the official SDG indicators alone are too lagging; we want a leading indicator of administrative behaviour that updates quarterly rather than annually. This is a debatable methodological choice and we publish it openly precisely because it is debatable.

What we owe each other

The civic-tech indicator space is small enough that no single tool will replace the others, and large enough that overlap is unavoidable. Our position is that the field is healthier when tools cross-cite, point users at each other for their appropriate use cases, and disagree publicly about methodology choices.

If you're at SDSN, ICLEI, Eurocities, the JRC, or any of the other organisations working in adjacent space — and we get something wrong about your tool, your methodology, or your audience: the inbox is open at methodology@cittopia.com. We'll publish a correction with credit.