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Maps · head to head

Cesium ion vs Fused

Cesium ion logo

Cesium ion

Maps

Hosted 3D geospatial tiling and streaming, metered by storage, streaming and gigapixels

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: Cesium ion streaming is metered in gigabytes a month, so a public-facing application's cost is driven by visitor traffic you do not control, and a successful launch can blow through a tier immediately.; 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: Cesium ion covers 3D Tiles tiling, Fused covers User defined functions.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Cesium ion and Fused actually diverge.

Attributes where Cesium ion and Fused differ
AttributeCesium ionFused
Pricing modelPer month by storage, streaming and gigapixelsPer month by compute tier
PlatformsWeb, CloudWeb, 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 Cesium ion

  • 3D Tiles tiling
  • Global terrain and imagery
  • Google Photorealistic 3D Tiles
  • Cloud reality modelling
  • Streaming delivery
  • Access tokens
  • Geocoding
  • Self-hosted option

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.

Cesium ion

  • A survey firm delivering a photogrammetry mesh to a client as a browser link rather than a 40 GB downloadnot Fused
  • A simulation team streaming global terrain and imagery into an Unreal Engine environmentnot Fused
  • An urban planning department publishing a city model that planners can inspect without desktop GIS softwarenot Fused
  • A software product embedding 3D geospatial views and needing hosted tiling rather than building a tilernot 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 Cesium ion
  • An analyst prototyping against Overture, Sentinel or Census data who needs a working map in an afternoon rather than a data engineering ticketnot Cesium ion
  • 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 Cesium ion
  • A consultancy delivering an interactive constraint or suitability map to a client, computed live from source data rather than pre-baked into static tilesnot Cesium ion

Where each one falls short

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

Cesium ion

  • Streaming is metered in gigabytes a month, so a public-facing application's cost is driven by visitor traffic you do not control, and a successful launch can blow through a tier immediately.
  • Reality modelling is billed in gigapixels a month, an unfamiliar unit that makes it hard to estimate in advance how many drone flights a plan will actually cover.
  • The free Community tier is restricted to non-commercial or open use, so a consultancy sharing a model with a paying client does not qualify regardless of how small the dataset is.
  • Team accounts cost substantially more than individual ones at the same quota, $524 against $149 on Commercial, so adding a second colleague is a large step rather than an incremental seat charge.
  • Self-hosting is available only under a custom enterprise agreement, which leaves organisations with data residency or air-gap requirements out of the published tiers entirely.

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

Cesium ion

Free
  • CommunityFree
    • 5 GB storage
    • 15 GB per month streaming
    • 20 gigapixels per month reality modelling
  • Commercial$149/month
    • 50 GB storage
    • 150 GB per month streaming
    • 40 gigapixels per month reality modelling
  • Premium$499/month
    • 250 GB storage
    • 500 GB per month streaming
    • 100 gigapixels per month reality modelling
  • Custom$undefined/year
    • Negotiated quotas
    • Self-hosted deployment in your own environment
    • Enterprise support

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 Cesium ion if

  • You need 3d tiles tiling.
  • You want to start without paying.
  • You work on Web, Cloud.
  • You also want global terrain and imagery.
Cesium ion 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 Cesium ion or Fused better?
Neither clearly leads. Cesium ion 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, Cesium ion or Fused?
Cesium ion starts at Free and Fused at Free.
Does Cesium ion or Fused run on more platforms?
Cesium ion runs on Web, Cloud. Fused runs on Web, Linux, macOS, Windows.
Can I use Cesium ion for free?
Both have a free tier, so you can try either at no cost before committing.
What is Cesium ion best used for?
Cesium ion is most often used for a survey firm delivering a photogrammetry mesh to a client as a browser link rather than a 40 gb download, a simulation team streaming global terrain and imagery into an unreal engine environment, an urban planning department publishing a city model that planners can inspect without desktop gis software, a software product embedding 3d geospatial views and needing hosted tiling rather than building a tiler. Of those, a survey firm delivering a photogrammetry mesh to a client as a browser link rather than a 40 gb download and a simulation team streaming global terrain and imagery into an unreal engine environment are not what Fused is typically brought in for.
What can Cesium ion do that Fused cannot?
Cesium ion covers 3D Tiles tiling, Global terrain and imagery, Google Photorealistic 3D Tiles, Cloud reality modelling. Fused covers User defined functions, Instant tile endpoints, HTTP API, Caching.

Answered from the vendors’ own pages

Cesium ion: How is Cesium ion priced?

By several meters at once: storage in gigabytes, streaming in gigabytes per month, and reality modelling in gigapixels per month. Commercial starts at $149 a month for an individual.

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.

Cesium ion: Is the free tier usable commercially?

No. Community is for non-commercial or open use. Commercial work needs a paid plan.

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.

Cesium ion: Can I run ion on my own infrastructure?

Only under a custom enterprise agreement negotiated with Cesium.

Fused: Can I run UDFs locally?

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

Cesium ion: Do I need Cesium ion to use CesiumJS?

No. CesiumJS is open source and free. ion provides hosted tiling, base layers and streaming that you would otherwise have to build.

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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