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Maps · head to head

Cesium ion vs What3words

Cesium ion logo

Cesium ion

Maps

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

From
Free
Rated
-
Full reviewWebsite
What3words logo

What3words

Maps

What3words has divided the world into 3m squares and given each one

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only Cesium ion has a free tier, so it costs nothing to try first.
  • 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.; What3words the free API plan includes no coordinate conversion, only AutoSuggest, and is rate limited to 5 requests per second
  • They diverge on capability: Cesium ion covers 3D Tiles tiling, What3words covers Core Functionality.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Cesium ion and What3words actually diverge.

Attributes where Cesium ion and What3words differ
AttributeCesium ionWhat3words
Starting priceFreeOn request
Pricing modelPer month by storage, streaming and gigapixelsfreemium
Free tierYesNo
PlatformsWeb, CloudWeb

Identical on both: 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 What3words

  • Core Functionality
  • User Interface

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 What3words
  • A simulation team streaming global terrain and imagery into an Unreal Engine environmentnot What3words
  • An urban planning department publishing a city model that planners can inspect without desktop GIS softwarenot What3words
  • A software product embedding 3D geospatial views and needing hosted tiling rather than building a tilernot What3words

What3words

  • Referring to a 3 metre square location with three wordsnot Cesium ion
  • Adding location entry to a delivery or dispatch appnot Cesium ion
  • Converting between coordinates and what3words addresses via APInot 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.

What3words

  • The free API plan includes no coordinate conversion, only AutoSuggest, and is rate limited to 5 requests per second
  • Converting to and from what3words addresses starts on the Basic plan at $9.99 per month for 1,000 conversions
  • Priority and developer support require the Standard plan at $45 per month
  • 24/7 phone support requires the Plus plan at $125 per month
  • Custom invoicing and annual payment require the Premium plan at $300 per month
  • Overage pricing is not published; the page states only that a fair usage policy applies
  • The three word address scheme is proprietary and licensed rather than open data

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

What3words

On request

No published plan breakdown. See the What3words review.

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 What3words if

  • You need core functionality.
  • You also want user interface.
What3words review

Questions people ask

Is Cesium ion or What3words better?
Neither clearly leads. Cesium ion starts at Free and What3words at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Cesium ion or What3words?
Cesium ion has a free tier; the other does not. Paid plans start at Free for Cesium ion and On request for What3words.
Does Cesium ion or What3words run on more platforms?
Cesium ion runs on Web, Cloud. What3words runs on Web.
Can I use Cesium ion for free?
Yes. Cesium ion has a free tier, so you can try it without paying. What3words starts at On request.
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 What3words is typically brought in for.
What can Cesium ion do that What3words cannot?
Cesium ion covers 3D Tiles tiling, Global terrain and imagery, Google Photorealistic 3D Tiles, Cloud reality modelling. What3words covers Core Functionality, User Interface.

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.

Cesium ion: Is the free tier usable commercially?

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

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

Only under a custom enterprise agreement negotiated with Cesium.

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.

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