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Maps · head to head

CesiumJS vs Fused

CesiumJS logo

CesiumJS

Maps

Open-source JavaScript library for creating 3D globes and 2D maps with support

From
Free
Rated
-
Full reviewWebsite
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

The short version

  • Each has a real cost: CesiumJS the free Community tier does not permit commercial 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.
  • They diverge on capability: CesiumJS covers Core Functionality, Fused covers User defined functions.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which CesiumJS and Fused actually diverge.

Attributes where CesiumJS and Fused differ
AttributeCesiumJSFused
Pricing modelopen-sourcePer month by compute tier
PlatformsWebWeb, Linux, macOS, Windows

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 CesiumJS

  • Core Functionality
  • User Interface

Only in Fused

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

What people use each for

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

CesiumJS

  • Streaming 3D terrain, imagery and building data into web applicationsnot Fused
  • Tiling and hosting large geospatial and reality capture datasetsnot Fused

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 CesiumJS
  • An analyst prototyping against Overture, Sentinel or Census data who needs a working map in an afternoon rather than a data engineering ticketnot CesiumJS
  • 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 CesiumJS
  • A consultancy delivering an interactive constraint or suitability map to a client, computed live from source data rather than pre-baked into static tilesnot CesiumJS

Where each one falls short

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

CesiumJS

  • The free Community tier does not permit commercial use
  • The cheapest commercial plan is $149 a month for an individual and $524 for a team
  • Team accounts are capped at 5 members on both the Commercial and Premium plans
  • Three separate quotas apply at once, being storage, monthly streaming and monthly reality modelling gigapixels, and exceeding any one of them constrains the account
  • Streaming is capped at 15 GB a month on the free tier

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.

Pricing, plan by plan

CesiumJS

Free

No published plan breakdown. See the CesiumJS review.

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

Which should you pick?

Choose CesiumJS if

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

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

Questions people ask

Is CesiumJS or Fused better?
Neither clearly leads. CesiumJS starts at Free and Fused at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, CesiumJS or Fused?
CesiumJS starts at Free and Fused at Free.
Does CesiumJS or Fused run on more platforms?
CesiumJS runs on Web. Fused runs on Web, Linux, macOS, Windows.
Can I use CesiumJS for free?
Both have a free tier, so you can try either at no cost before committing.
What is CesiumJS best used for?
CesiumJS is most often used for streaming 3d terrain, imagery and building data into web applications, tiling and hosting large geospatial and reality capture datasets. Of those, streaming 3d terrain, imagery and building data into web applications and tiling and hosting large geospatial and reality capture datasets are not what Fused is typically brought in for.
What can CesiumJS do that Fused cannot?
CesiumJS covers Core Functionality, User Interface. Fused covers User defined functions, Instant tile endpoints, HTTP API, Caching.

Answered from the vendors’ own pages

CesiumJS: Is Cesium ion free for commercial use?

Cesium offers a free Cesium ion community account, but the page does not explicitly state whether the free tier is permitted for commercial use or if restrictions apply to business applications.

Source
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.

CesiumJS: What are the limits of the free Cesium ion community account?

The page only mentions that a free community account is available but does not disclose usage limits, storage quotas, or feature restrictions for the free tier.

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.

CesiumJS: What do paid Cesium ion tiers cost?

The page does not provide specific pricing for paid tiers. It directs users to sign up for a free community account or contact Cesium directly for detailed pricing information.

Source
Fused: Can I run UDFs locally?

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

Fused: Does it replace PostGIS or BigQuery?

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

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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