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CesiumJS vs What3words

CesiumJS logo

CesiumJS

Maps

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

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 CesiumJS has a free tier, so it costs nothing to try first.
  • Each has a real cost: CesiumJS the free Community tier does not permit commercial use; What3words the free API plan includes no coordinate conversion, only AutoSuggest, and is rate limited to 5 requests per second
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which CesiumJS and What3words actually diverge.

Attributes where CesiumJS and What3words differ
AttributeCesiumJSWhat3words
Starting priceFreeOn request
Pricing modelopen-sourcefreemium
Free tierYesNo

Identical on both: platforms (Web), 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

Nothing recorded that What3words does not also cover.

Only in What3words

Nothing recorded that CesiumJS does not also cover.

Both cover

  • Core Functionality
  • User Interface

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 What3words
  • Tiling and hosting large geospatial and reality capture datasetsnot What3words

What3words

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

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

CesiumJS

Free

No published plan breakdown. See the CesiumJS review.

What3words

On request

No published plan breakdown. See the What3words review.

Which should you pick?

Choose CesiumJS if

  • You want to start without paying.
CesiumJS review

Choose What3words if

Nothing in the data separates What3words from CesiumJS on the points above - pick on price and on how each one feels to use.

What3words review

Questions people ask

Is CesiumJS or What3words better?
Neither clearly leads. CesiumJS 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, CesiumJS or What3words?
CesiumJS has a free tier; the other does not. Paid plans start at Free for CesiumJS and On request for What3words.
Does CesiumJS or What3words run on more platforms?
Both run on Web, so platform support will not decide this one for you.
Can I use CesiumJS for free?
Yes. CesiumJS has a free tier, so you can try it without paying. What3words starts at On request.
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 What3words is typically brought in for.

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
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
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
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