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Aviation · head to head

AGI STK vs SkyDemon

AGI STK logo

AGI STK

Aviation

Systems Tool Kit for space and aerospace analysis

From
Free
Rated
-
Full reviewWebsite
SkyDemon logo

SkyDemon

Aviation

VFR flight planning for European pilots

From
£118/year
Rated
-
Full reviewWebsite

The short version

  • Only AGI STK has a free tier, so it costs nothing to try first.
  • Each has a real cost: AGI STK sTK is sold as a ladder of separate licences, STK Pro, STK Premium Air, STK Premium Space and STK Enterprise, so mission areas are gated behind different products; SkyDemon monthly subscription pricing not specified on store page
  • They diverge on capability: AGI STK covers Orbit analysis, SkyDemon covers VFR planning.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which AGI STK and SkyDemon actually diverge.

Attributes where AGI STK and SkyDemon differ
AttributeAGI STKSkyDemon
Starting priceFree£118/year
Free tierYesNo
PlatformsWindows, LinuxIos, Android, Windows, Macos
Founded19892009

Identical on both: pricing model (subscription), user rating (Not yet rated), category (Aviation).

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 AGI STK

  • Orbit analysis
  • 4D visualization
  • Mission planning
  • Communication analysis
  • Conjunction assessment
  • MATLAB
  • Python
  • C++/.NET API

Only in SkyDemon

  • VFR planning
  • Airspace display
  • Weather overlay
  • Navigation
  • Flight logging
  • Traffic receivers
  • FLARM
  • ADS-B

Both cover

  • Data encryption
  • Windows support

What people use each for

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

AGI STK

  • Modelling satellite orbits, coverage and conjunction risknot SkyDemon
  • Mission analysis and visualization for air, space and defence systemsnot SkyDemon

SkyDemon

  • Flight planningnot AGI STK
  • Aviation navigationnot AGI STK
  • Personal leisure flyingnot AGI STK
  • Commercial flight operationsnot AGI STK

Where each one falls short

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

AGI STK

  • STK is sold as a ladder of separate licences, STK Pro, STK Premium Air, STK Premium Space and STK Enterprise, so mission areas are gated behind different products
  • Further capability is sold as separate add-on toolkits including TETK, the RF Channel Modeler and the STK Missile Toolkit
  • Distributing an application built on STK Engine to end users requires each of them to hold an Ansys STK Engine Runtime License
  • Free access is limited to students at accredited institutions and to time-limited trials
  • No price, minimum or cost driver is published for any STK tier

SkyDemon

  • Monthly subscription pricing not specified on store page
  • Business licensing pricing not listed; requires contact

Pricing, plan by plan

AGI STK

Free
  • STK FreeFree
    • Basic analysis
    • 2D/3D visualization
    • Orbit analysis
  • STK Professional$15000/year
    • Advanced analysis
    • Premium modules
    • API access
  • STK Enterprise$50000/year
    • All modules
    • Multi-user
    • Custom solutions

SkyDemon

£118/year
  • Personal Annual$118/year
    • Two PCs access
    • Two mobile devices access
    • Personal leisure use
  • Personal Annual Renewal$90/year
    • Two PCs access
    • Two mobile devices access
    • Personal leisure use
  • Personal Monthly$null/month
    • Two PCs access
    • Two mobile devices access
    • Personal leisure use
  • Business Licensing$null/per device
    • Per-device pricing
    • Commercial use

Which should you pick?

Choose AGI STK if

  • You need orbit analysis.
  • You want to start without paying.
  • You work on Windows, Linux.
  • You also want 4d visualization.
AGI STK review

Choose SkyDemon if

  • You need vfr planning.
  • You work on Ios, Android, Windows, Macos.
  • You also want airspace display.
SkyDemon review

Questions people ask

Is AGI STK or SkyDemon better?
Neither clearly leads. AGI STK starts at Free and SkyDemon at £118/year, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, AGI STK or SkyDemon?
AGI STK has a free tier; the other does not. Paid plans start at Free for AGI STK and £118/year for SkyDemon.
Does AGI STK or SkyDemon run on more platforms?
AGI STK runs on Windows, Linux. SkyDemon runs on Ios, Android, Windows, Macos.
Can I use AGI STK for free?
Yes. AGI STK has a free tier, so you can try it without paying. SkyDemon starts at £118/year.
What is AGI STK best used for?
AGI STK is most often used for modelling satellite orbits, coverage and conjunction risk, mission analysis and visualization for air, space and defence systems. Of those, modelling satellite orbits, coverage and conjunction risk and mission analysis and visualization for air, space and defence systems are not what SkyDemon is typically brought in for.
What can AGI STK do that SkyDemon cannot?
AGI STK covers Orbit analysis, 4D visualization, Mission planning, Communication analysis. SkyDemon covers VFR planning, Airspace display, Weather overlay, Navigation. Both handle Data encryption, Windows support.

Answered from the vendors’ own pages

SkyDemon: How much does SkyDemon cost?

SkyDemon's personal subscription costs GBP 118 per year for new subscribers, covering access to two PCs and two mobile devices for personal leisure use. Renewal for year two and beyond is GBP 90 per year. A monthly option is also available but specific pricing is not listed on the store page.

Source
SkyDemon: What is the difference between SkyDemon personal and business subscriptions?

Personal subscriptions are for leisure flying and cover two PCs and two mobile devices at GBP 118 annually (GBP 90 for renewals). Business licensing is available per device for commercial flying, but specific business pricing is not listed on the store page and requires contact for details.

Source
SkyDemon: Does SkyDemon include flightplan credits?

Yes, free flightplan credits are included with card purchases on personal subscriptions. Additional flightplan credits can be purchased separately, though specific pricing is not detailed on the store page.

Source
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