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Maps · head to head

Fused vs Leaflet

Fused logo

Fused

Maps

Serverless Python for geospatial: write a UDF, get a map tile endpoint and an HTTP API

From
Free
Rated
-
Full reviewWebsite
Leaflet logo

Leaflet

Maps

Leading open-source JavaScript library for mobile-friendly interactive maps, used by millions of developers worldwide

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Fused the price steps are brutal: $20 to $200 to $2,000 a month with no intermediate tier, so a two-person team that outgrows Starter faces a tenfold increase for what is often a modest capacity gap.; Leaflet 2D only with no support for 3D features, tilt, or rotation
  • They diverge on capability: Fused covers User defined functions, Leaflet covers Core Functionality.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Fused and Leaflet actually diverge.

Attributes where Fused and Leaflet differ
AttributeFusedLeaflet
Pricing modelPer month by compute tierUnknown
PlatformsWeb, Linux, macOS, WindowsWeb

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Maps).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Fused

  • User defined functions
  • Instant tile endpoints
  • HTTP API
  • Caching
  • Workbench
  • Data stack connectors
  • Public UDF catalogue
  • Local execution

Only in Leaflet

  • Core Functionality
  • User Interface

What people use each for

The jobs each tool is most often brought in to do.

Fused

  • A data team that wants to publish a dynamic layer computed from a large Parquet dataset without standing up and operating a tile servernot Leaflet
  • An analyst prototyping against Overture, Sentinel or Census data who needs a working map in an afternoon rather than a data engineering ticketnot Leaflet
  • An application that needs a geospatial computation exposed as an HTTP endpoint, where the alternative is a container, a queue and an on-call rotanot Leaflet
  • A consultancy delivering an interactive constraint or suitability map to a client, computed live from source data rather than pre-baked into static tilesnot Leaflet

Leaflet

  • Embedding interactive maps in a web pagenot Fused
  • Mobile-friendly map interfaces across desktop and mobile browsersnot Fused
  • Mapping where bundle size matters, at roughly 42 KB of JavaScriptnot Fused
  • Extending a basic map with plugins rather than adopting a full platformnot Fused

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Fused

  • The price steps are brutal: $20 to $200 to $2,000 a month with no intermediate tier, so a two-person team that outgrows Starter faces a tenfold increase for what is often a modest capacity gap.
  • Published tiers do not state the actual compute, storage or request allowances, so the only way to know whether $200 covers your workload is to run it and find out.
  • Fused is at pre-seed stage with a small team, and putting a customer-facing map behind a startup’s serverless platform is a continuity risk that a procurement review will flag.
  • It is Python-only and assumes competence with cloud-native geospatial formats; there is no path for an analyst who works in a desktop GIS and not in code.
  • Serverless execution means cold starts and per-tile latency on uncached views, so a first load of a heavy UDF over a wide area is noticeably slower than a pre-rendered tile set.

Leaflet

  • 2D only with no support for 3D features, tilt, or rotation
  • Performance degrades when rendering large datasets of complex vector geometries without optimization
  • Limited dynamic styling support; style is fixed on the server when using raster tiles
  • Lacks native support for WMS features; requires plugins like Leaflet.WMS and complex feature identification is cumbersome
  • Requires external tile service for map imagery; does not provide map tiles natively

Pricing, plan by plan

Fused

Free
  • FreeFree
    • Workbench access
    • AI assistant
    • Local UDF runs
  • Starter$20/month
    • Secrets management
    • Higher compute limits
    • Office hours support
  • Developer$200/month
    • Dedicated jobs
    • GitHub integration
    • Expanded compute, storage and AI token allowance
  • Professional$2000/month
    • Team collaboration
    • Dedicated training
    • Substantially increased usage limits

Leaflet

Free

No published plan breakdown. See the Leaflet review.

Which should you pick?

Choose Fused if

  • You need user defined functions.
  • You want to start without paying.
  • You work on Web, Linux, macOS, Windows.
  • You also want instant tile endpoints.
Fused review

Choose Leaflet if

  • You need core functionality.
  • You want to start without paying.
  • You also want user interface.
Leaflet review

Questions people ask

Is Fused or Leaflet better?
Neither clearly leads. Fused starts at Free and Leaflet at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Fused or Leaflet?
Fused starts at Free and Leaflet at Free.
Does Fused or Leaflet run on more platforms?
Fused runs on Web, Linux, macOS, Windows. Leaflet runs on Web.
Can I use Fused for free?
Both have a free tier, so you can try either at no cost before committing.
What is Fused best used for?
Fused is most often used for a data team that wants to publish a dynamic layer computed from a large parquet dataset without standing up and operating a tile server, an analyst prototyping against overture, sentinel or census data who needs a working map in an afternoon rather than a data engineering ticket, an application that needs a geospatial computation exposed as an http endpoint, where the alternative is a container, a queue and an on-call rota, a consultancy delivering an interactive constraint or suitability map to a client, computed live from source data rather than pre-baked into static tiles. Of those, a data team that wants to publish a dynamic layer computed from a large parquet dataset without standing up and operating a tile server and an analyst prototyping against overture, sentinel or census data who needs a working map in an afternoon rather than a data engineering ticket are not what Leaflet is typically brought in for.
What can Fused do that Leaflet cannot?
Fused covers User defined functions, Instant tile endpoints, HTTP API, Caching. Leaflet covers Core Functionality, User Interface.

Answered from the vendors’ own pages

Fused: What does Fused actually give me?

A Python function becomes a map tile endpoint and an HTTP API on managed infrastructure, with caching, without you running a server.

Leaflet: Is Leaflet free and open source?

Yes. Leaflet is open-source JavaScript library licensed for free use. Over 400 plugins add capabilities like marker clustering, heatmaps, drawing tools, geocoding, and routing.

Source
Fused: How much does it cost?

Free, then $20, $200 and $2,000 per month for Starter, Developer and Professional. Usage allowances are not itemised publicly.

Leaflet: How do I include Leaflet in my project via CDN?

Leaflet is available on multiple free CDNs including unpkg, cdnjs, and jsDelivr. Include the CSS stylesheet from https://unpkg.com/[email protected]/dist/leaflet.css and JavaScript from https://unpkg.com/[email protected]/dist/leaflet.js in your HTML head.

Source
Fused: Can I run UDFs locally?

Yes, through the Python SDK, which is how most development is done before deploying.

Leaflet: What mapping services does Leaflet support?

Leaflet integrates seamlessly with various mapping services including OpenStreetMap, Google Maps, Bing, and other custom tile providers, allowing developers to choose the best base layer.

Source
Fused: Does it replace PostGIS or BigQuery?

No. It reads from them. Fused is the compute and serving layer, not the store.

Leaflet: What is the file size of Leaflet?

Leaflet weighs about 42 KB of JavaScript.

Source
Fused: Is it a mature company?

No. It is a small pre-seed San Francisco company. The technology is real; the vendor risk is real too.

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