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Education · head to head

Merlin Bird ID vs Stellarium

Merlin Bird ID logo

Merlin Bird ID

Education

Free bird identification app from Cornell Lab of Ornithology using photo, sound and step-by-step ID

From
Free
Rated
-
Full reviewWebsite
Stellarium logo

Stellarium

Education

Free open source desktop planetarium software, distinct from the paid Stellarium Mobile Plus app

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Merlin Bird ID it only identifies birds, so it is not useful for plants, insects or other wildlife the way a general nature app is.; Stellarium it is desktop-only software, so it has no native touch-optimised phone interface; the similarly named mobile app is a different paid product from a different company.
  • They diverge on capability: Merlin Bird ID covers Sound ID, Stellarium covers Photorealistic sky rendering.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Merlin Bird ID and Stellarium actually diverge.

Attributes where Merlin Bird ID and Stellarium differ
AttributeMerlin Bird IDStellarium
Pricing modelFree, no ads and no in-app purchasesOpen source, no licence fee
PlatformsiOS, AndroidWindows, macOS, Linux

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Education).

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 Merlin Bird ID

  • Sound ID
  • Photo ID
  • Step-by-step ID
  • Offline regional packs
  • eBird-linked suggestions
  • No account required for basic use

Only in Stellarium

  • Photorealistic sky rendering
  • Large object catalogue
  • Telescope control
  • Scripting engine
  • Free and open source
  • Plugin ecosystem

What people use each for

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

Merlin Bird ID

  • A casual walker who hears a bird and wants to know what it is without paying for an appnot Stellarium
  • A birdwatcher building a life list who wants identification tied to real regional sighting datanot Stellarium
  • Someone teaching a child to identify birds without exposing them to ads or a paywallnot Stellarium
  • A hiker who wants offline bird identification in an area with no signalnot Stellarium

Stellarium

  • A student or educator wanting a serious, scriptable planetarium tool without a budget line itemnot Merlin Bird ID
  • An amateur astronomer wanting telescope control from desktop software they can inspect and modifynot Merlin Bird ID
  • Someone running a planetarium display or public astronomy event on a scripted shownot Merlin Bird ID
  • A hobbyist who wants a large object catalogue without paying a subscription, and does not need a phone appnot Merlin Bird ID

Where each one falls short

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

Merlin Bird ID

  • It only identifies birds, so it is not useful for plants, insects or other wildlife the way a general nature app is.
  • Sound ID can struggle in noisy environments or with overlapping bird calls, since it depends on a clean audio signal.
  • Being a free institutional project, feature releases and interface polish move more slowly than a funded commercial app.
  • Photo ID accuracy drops for juvenile birds, moulting birds or poor-quality photos, more so than for well-lit adult specimens.
  • It has no social or gamified layer, so users who want streaks, badges or a community feed will find it plain by comparison.

Stellarium

  • It is desktop-only software, so it has no native touch-optimised phone interface; the similarly named mobile app is a different paid product from a different company.
  • As a volunteer-maintained open source project, support is community-based rather than a guaranteed commercial help desk.
  • The interface, while capable, is less immediately intuitive for a first-time user than a polished commercial phone app.
  • Telescope control and some advanced plugins require additional setup that a non-technical user may find fiddly.
  • Because it shares a name with the unrelated paid Stellarium Mobile Plus app, buyers researching pricing online can easily conflate the two products.

Pricing, plan by plan

Merlin Bird ID

Free
  • Merlin Bird IDFree
    • All identification modes included
    • Offline regional bird packs
    • No account required for identification

Stellarium

Free
  • Stellarium DesktopFree
    • Full software, GPL licensed
    • No account, ads or subscription
    • Community-developed plugins

Which should you pick?

Choose Merlin Bird ID if

  • You need sound id.
  • You want to start without paying.
  • You work on iOS, Android.
  • You also want photo id.
Merlin Bird ID review

Choose Stellarium if

  • You need photorealistic sky rendering.
  • You want to start without paying.
  • You work on Windows, macOS, Linux.
  • You also want large object catalogue.
Stellarium review

Questions people ask

Is Merlin Bird ID or Stellarium better?
Neither clearly leads. Merlin Bird ID starts at Free and Stellarium at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Merlin Bird ID or Stellarium?
Merlin Bird ID starts at Free and Stellarium at Free.
Does Merlin Bird ID or Stellarium run on more platforms?
Merlin Bird ID runs on iOS, Android. Stellarium runs on Windows, macOS, Linux.
Can I use Merlin Bird ID for free?
Both have a free tier, so you can try either at no cost before committing.
What is Merlin Bird ID best used for?
Merlin Bird ID is most often used for a casual walker who hears a bird and wants to know what it is without paying for an app, a birdwatcher building a life list who wants identification tied to real regional sighting data, someone teaching a child to identify birds without exposing them to ads or a paywall, a hiker who wants offline bird identification in an area with no signal. Of those, a casual walker who hears a bird and wants to know what it is without paying for an app and a birdwatcher building a life list who wants identification tied to real regional sighting data are not what Stellarium is typically brought in for.
What can Merlin Bird ID do that Stellarium cannot?
Merlin Bird ID covers Sound ID, Photo ID, Step-by-step ID, Offline regional packs. Stellarium covers Photorealistic sky rendering, Large object catalogue, Telescope control, Scripting engine.

Answered from the vendors’ own pages

Merlin Bird ID: Is Merlin Bird ID really free with no catch?

Yes. It has no ads, no in-app purchases and no subscription; it is funded by the Cornell Lab of Ornithology as a research and outreach tool.

Stellarium: Is Stellarium really free?

The desktop software is free and open source under the GPL licence. The separate mobile app, Stellarium Mobile Plus, is a different paid product.

Merlin Bird ID: How is it different from eBird?

Merlin identifies birds; eBird is where you log checklists and sightings that feed the research database Merlin draws its suggestions from.

Stellarium: Is the mobile app made by the same team?

No. Stellarium Mobile Plus is built by Noctua Software, a different company, and is sold on subscription.

Merlin Bird ID: Does it work offline?

Yes, once you download the regional bird pack for your area.

Stellarium: What platforms does the free version run on?

Windows, macOS and Linux desktop.

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