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Maritime · head to head

DNV Navigator Port vs StormGlass

DNV Navigator Port logo

DNV Navigator Port

Maritime

Port clearance and ship-to-shore reporting software that assembles the documents a vessel needs before arrival

From
On request
Rated
-
Full reviewWebsite
StormGlass logo

StormGlass

Maritime

Global weather data API for maritime

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only StormGlass has a free tier, so it costs nothing to try first.
  • Each has a real cost: DNV Navigator Port nothing is published about pricing and licensing is per vessel through DNV sales, so a fleet cannot estimate cost without a commercial conversation.; StormGlass the free tier allows 10 API requests per day and is not licensed for commercial use
  • They diverge on capability: DNV Navigator Port covers Port clearance packs, StormGlass covers Marine weather data.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which DNV Navigator Port and StormGlass actually diverge.

Attributes where DNV Navigator Port and StormGlass differ
AttributeDNV Navigator PortStormGlass
Starting priceOn requestFree
Pricing modelquotefreemium
Free tierNoYes
PlatformsWindows, WebApi
FoundedUnknown2017

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 DNV Navigator Port

  • Port clearance packs
  • Weekly content updates
  • ALRS Volume 6
  • Work and rest hours
  • Crew certificates
  • Offline operation
  • Shore visibility
  • Third-party integration

Only in StormGlass

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

What people use each for

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

DNV Navigator Port

  • A tanker operator whose vessels call at ports where a rejected declaration means a berth is lost and demurrage startsnot StormGlass
  • A ship manager standardising port formalities across a mixed fleet and multiple crewing agenciesnot StormGlass
  • An operator that must evidence MLC work and rest compliance to a port state control inspector on demandnot StormGlass
  • A cruise line calling at many ports per voyage where the paperwork volume exceeds what a bridge team can maintain manuallynot StormGlass

StormGlass

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

Where each one falls short

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

DNV Navigator Port

  • Nothing is published about pricing and licensing is per vessel through DNV sales, so a fleet cannot estimate cost without a commercial conversation.
  • It is a point solution covering clearance and crew hours only, so it adds another shipboard system to install, update and train crews on rather than consolidating existing ones.
  • The onboard component is a Windows installation that needs periodic updating on each vessel, and update discipline across a fleet with rotating crews is a genuine operational burden.
  • Content coverage is deepest for major commercial ports; operators calling at small or remote terminals will still assemble some documentation manually and pay for a dataset that does not cover their edge cases.
  • DNV is a classification society selling software to the same operators it classes, which some owners view as a conflict when choosing systems that generate compliance evidence.

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

Pricing, plan by plan

DNV Navigator Port

On request
  • Navigator Port$undefined/year
    • Licensed per vessel with fleet agreements available
    • Weekly content updates and 24/7 support included
    • Onboard installation plus shore-side access

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

Which should you pick?

Choose DNV Navigator Port if

  • You need port clearance packs.
  • You work on Windows, Web.
  • You also want weekly content updates.
DNV Navigator Port review

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

Questions people ask

Is DNV Navigator Port or StormGlass better?
Neither clearly leads. DNV Navigator Port starts at On request and StormGlass at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, DNV Navigator Port or StormGlass?
StormGlass has a free tier; the other does not. Paid plans start at On request for DNV Navigator Port and Free for StormGlass.
Does DNV Navigator Port or StormGlass run on more platforms?
DNV Navigator Port runs on Windows, Web. StormGlass runs on Api.
Can I use StormGlass for free?
Yes. StormGlass has a free tier, so you can try it without paying. DNV Navigator Port starts at On request.
What is DNV Navigator Port best used for?
DNV Navigator Port is most often used for a tanker operator whose vessels call at ports where a rejected declaration means a berth is lost and demurrage starts, a ship manager standardising port formalities across a mixed fleet and multiple crewing agencies, an operator that must evidence mlc work and rest compliance to a port state control inspector on demand, a cruise line calling at many ports per voyage where the paperwork volume exceeds what a bridge team can maintain manually. Of those, a tanker operator whose vessels call at ports where a rejected declaration means a berth is lost and demurrage starts and a ship manager standardising port formalities across a mixed fleet and multiple crewing agencies are not what StormGlass is typically brought in for.
What can DNV Navigator Port do that StormGlass cannot?
DNV Navigator Port covers Port clearance packs, Weekly content updates, ALRS Volume 6, Work and rest hours. StormGlass covers Marine weather data, Wave forecasts, Tide data, Historical weather.

Answered from the vendors’ own pages

DNV Navigator Port: How often is port information updated?

Weekly to the onboard installation, which is the main thing the subscription buys.

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
DNV Navigator Port: Does it work without internet?

Yes. The onboard component is built to operate through satellite connectivity loss.

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
DNV Navigator Port: Does it cover work and rest hours?

Yes, it calculates against selected MLC and STCW regimes and warns on breaches.

StormGlass: Is annual billing available?

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

Source
DNV Navigator Port: Is pricing published?

No. It is licensed per vessel through DNV with fleet agreements negotiated.

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