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Maritime · head to head

StormGlass vs ZeroNorth

StormGlass logo

StormGlass

Maritime

Global weather data API for maritime

From
Free
Rated
-
Full reviewWebsite
ZeroNorth logo

ZeroNorth

Maritime

Voyage optimisation, bunker procurement and emissions reporting for shipping, priced per vessel per module

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only StormGlass has a free tier, so it costs nothing to try first.
  • Each has a real cost: StormGlass the free tier allows 10 API requests per day and is not licensed for commercial use; ZeroNorth zeroNorth reported a net loss of roughly $65m for the 2024 financial year, deepening by around 57 per cent, so a multi-year fleet commitment should include contractual protection on continuity and pricing.
  • They diverge on capability: StormGlass covers Marine weather data, ZeroNorth covers Voyage optimisation.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which StormGlass and ZeroNorth actually diverge.

Attributes where StormGlass and ZeroNorth differ
AttributeStormGlassZeroNorth
Starting priceFreeOn request
Pricing modelfreemiumquote
Free tierYesNo
PlatformsApiWeb, Cloud, iOS, Android
Founded2017Unknown

Identical on both: user rating (Not yet rated), category (Maritime).

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 StormGlass

  • Marine weather data
  • Wave forecasts
  • Tide data
  • Historical weather
  • REST API
  • Webhooks
  • SDKs
  • Api support

Only in ZeroNorth

  • Voyage optimisation
  • Bunker procurement
  • Bunker price intelligence
  • Emissions compliance
  • Vessel selection
  • Agentic voyage automation

What people use each for

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

StormGlass

  • Pulling marine weather and sea state forecasts into a vessel routing or planning toolnot ZeroNorth
  • Adding tide, wave and wind data to a maritime or coastal applicationnot ZeroNorth

ZeroNorth

  • A tanker operator wanting speed decisions that account for the freight market rather than optimising fuel in isolationnot StormGlass
  • A bunker buyer testing supplier quotes against independent fair value pricing before fixing a stemnot StormGlass
  • An owner needing EU ETS and FuelEU Maritime reporting derived from the same voyage data that drives operational decisionsnot StormGlass
  • A charterer evaluating which vessel to take on a cargo based on projected voyage economics rather than on nominal specificationsnot StormGlass

Where each one falls short

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

StormGlass

  • The free tier allows 10 API requests per day and is not licensed for commercial use
  • Commercial use and any support at all start at the Medium plan, 49 euros a month
  • The Small plan at 19 euros a month has no support and no commercial licence
  • Request allowances are daily rather than monthly, so a burst of traffic cannot borrow against a quiet week

ZeroNorth

  • ZeroNorth reported a net loss of roughly $65m for the 2024 financial year, deepening by around 57 per cent, so a multi-year fleet commitment should include contractual protection on continuity and pricing.
  • The company consolidated operations during 2025, liquidating a Norwegian subsidiary, which is prudent cost control but means local presence and account continuity may not be what was originally sold.
  • Pricing is per vessel and per module, so the headline vessel figure understates the cost of an owner who wants voyage, bunker and emissions capability across a fleet.
  • Recommendation quality depends on the quality of noon reports and vessel data supplied, and an owner with poor reporting discipline will get poor optimisation regardless of the algorithms.
  • It sits between technical performance tools and chartering systems and fully replaces neither, so most owners run it alongside an existing voyage management system and pay for overlapping capability.

Pricing, plan by plan

StormGlass

Free
  • FreeFree
    • 10 requests per day
    • All weather parameters
    • Not for commercial use
  • Small$19/month
    • 500 requests per day
    • All weather parameters
    • 10% annual discount available
  • Medium$49/month
    • 5000 requests per day
    • All weather parameters
    • Full support
  • Large$129/month
    • 25000 requests per day
    • All weather parameters
    • Full support

ZeroNorth

On request
  • ZeroNorth platform$undefined/year
    • Subscription per vessel and per module
    • Voyage optimisation, bunker and emissions modules priced separately
    • Multi-year agreements typical

Which should you pick?

Choose StormGlass if

  • You need marine weather data.
  • You want to start without paying.
  • You work on Api.
  • You also want wave forecasts.
StormGlass review

Choose ZeroNorth if

  • You need voyage optimisation.
  • You work on Web, Cloud, iOS, Android.
  • You also want bunker procurement.
ZeroNorth review

Questions people ask

Is StormGlass or ZeroNorth better?
Neither clearly leads. StormGlass starts at Free and ZeroNorth at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, StormGlass or ZeroNorth?
StormGlass has a free tier; the other does not. Paid plans start at Free for StormGlass and On request for ZeroNorth.
Does StormGlass or ZeroNorth run on more platforms?
StormGlass runs on Api. ZeroNorth runs on Web, Cloud, iOS, Android.
Can I use StormGlass for free?
Yes. StormGlass has a free tier, so you can try it without paying. ZeroNorth starts at On request.
What is StormGlass best used for?
StormGlass is most often used for pulling marine weather and sea state forecasts into a vessel routing or planning tool, adding tide, wave and wind data to a maritime or coastal application. Of those, pulling marine weather and sea state forecasts into a vessel routing or planning tool and adding tide, wave and wind data to a maritime or coastal application are not what ZeroNorth is typically brought in for.
What can StormGlass do that ZeroNorth cannot?
StormGlass covers Marine weather data, Wave forecasts, Tide data, Historical weather. ZeroNorth covers Voyage optimisation, Bunker procurement, Bunker price intelligence, Emissions compliance.

Answered from the vendors’ own pages

StormGlass: Is there a free tier available?

Yes, Stormglass offers a free plan with 10 API requests per day, including all weather parameters, but it is not permitted for commercial use.

Source
ZeroNorth: How is ZeroNorth priced?

Per vessel and per module on subscription, typically multi-year and quoted. Nothing is published.

StormGlass: What does the Medium plan include?

The Medium plan costs 49 EUR per month and includes 5000 daily requests, all weather parameters, and full support for commercial use.

Source
ZeroNorth: Is ZeroNorth financially stable?

It is well funded, raising $20m in February 2025, but reported a net loss of roughly $65m for 2024. Treat continuity terms as a contractual issue.

StormGlass: Is annual billing available?

Yes, a 10% discount is available when paying annually on Small, Medium, and Large plans.

Source
ZeroNorth: Does it replace my voyage management system?

No. It complements commercial voyage management platforms; most owners run both and accept some overlap.

ZeroNorth: Does it need onboard hardware?

No. It works from noon reports, AIS and existing vessel data feeds rather than requiring its own collection box.

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