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Education · head to head

Duolingo vs SkySafari

Duolingo logo

Duolingo

Education

Learn a language for free, forever

From
Free
Rated
-
Full reviewWebsite
SkySafari logo

SkySafari

Education

Astronomy app sold in three tiered editions, from a cheap star chart to telescope control

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only Duolingo has a free tier, so it costs nothing to try first.
  • Each has a real cost: Duolingo free tier includes ads and energy-based hearts system limiting daily practice without paying; SkySafari the three tiers are separate purchases, so upgrading from Basic to Plus or Pro later means buying again rather than paying the price difference.
  • They diverge on capability: Duolingo covers 40+ languages, SkySafari covers Tiered editions.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Duolingo and SkySafari actually diverge.

Attributes where Duolingo and SkySafari differ
AttributeDuolingoSkySafari
Starting priceFreeOn request
Pricing modelUnknownOne-time purchase per tier
Free tierYesNo
PlatformsiOS, Android, WebiOS, Android, macOS
Founded2011Unknown

Identical on both: 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 Duolingo

  • 40+ languages
  • Gamification
  • Streaks
  • Leaderboards
  • Stories
  • Podcasts
  • Speaking exercises
  • AI tutor

Only in SkySafari

  • Tiered editions
  • Telescope control
  • Large object catalogue
  • Event finder
  • Observing log
  • Time control

What people use each for

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

Duolingo

  • Language learningnot SkySafari
  • Travel preparationnot SkySafari
  • Career developmentnot SkySafari
  • Cultural explorationnot SkySafari

SkySafari

  • An amateur astronomer with a motorised telescope mount who needs live control from a phone or tabletnot Duolingo
  • A serious hobbyist who wants a deep-sky catalogue far larger than a casual sky map app providesnot Duolingo
  • Someone planning an observing session who wants an event finder for conjunctions and eclipsesnot Duolingo
  • A buyer choosing Basic first as a cheap star chart with no intention of telescope controlnot Duolingo

Where each one falls short

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

Duolingo

  • Free tier includes ads and energy-based hearts system limiting daily practice without paying
  • Gamification focus may appeal to casual learners but lacks depth for serious language study beyond conversational basics
  • Limited to short, bite-sized lessons without extensive grammar explanations or cultural context

SkySafari

  • The three tiers are separate purchases, so upgrading from Basic to Plus or Pro later means buying again rather than paying the price difference.
  • Even the Basic tier costs more than a comparable free or freemium app like Star Walk 2 for a casual user.
  • Telescope control only works with compatible motorised mounts, so it is useless to someone with a manual telescope or no telescope at all.
  • Pricing fluctuates with frequent promotional sales, so the list price is not a reliable guide to what most buyers actually pay.
  • The interface, particularly on the Pro tier, has a steeper learning curve than a simple AR sky map app aimed at casual users.

Pricing, plan by plan

Duolingo

Free
  • FreeFree
    • All language courses
    • Ad-supported
    • Limited hearts (5-heart system)
  • Super$12.99/month
    • Ad-free
    • Unlimited hearts
    • Extra practice tools
  • Super Family$119.99/year
    • Up to 6 users
    • All Super features
    • Family group
  • Max$undefined/mo
    • All Super features
    • Video Call with Lily
    • Roleplay scenarios

SkySafari

On request
  • SkySafari Basic$4.99/one-time
    • Core star chart
    • Modest object catalogue
    • No telescope control
  • SkySafari Plus$14.99/one-time
    • About 2.5 million stars and 32,000 deep-sky objects
    • Telescope control
    • Event finder and observing log
  • SkySafari Pro$29.99/one-time
    • Largest catalogue tier
    • Telescope control
    • Advanced observation planning tools

Which should you pick?

Choose Duolingo if

  • You need 40+ languages.
  • You want to start without paying.
  • You work on iOS, Android, Web.
  • You also want gamification.
Duolingo review

Choose SkySafari if

  • You need tiered editions.
  • You work on iOS, Android, macOS.
  • You also want telescope control.
SkySafari review

Questions people ask

Is Duolingo or SkySafari better?
Neither clearly leads. Duolingo starts at Free and SkySafari at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Duolingo or SkySafari?
Duolingo has a free tier; the other does not. Paid plans start at Free for Duolingo and On request for SkySafari.
Does Duolingo or SkySafari run on more platforms?
Duolingo runs on iOS, Android, Web. SkySafari runs on iOS, Android, macOS.
Can I use Duolingo for free?
Yes. Duolingo has a free tier, so you can try it without paying. SkySafari starts at On request.
What is Duolingo best used for?
Duolingo is most often used for language learning, travel preparation, career development, cultural exploration. Of those, language learning and travel preparation are not what SkySafari is typically brought in for.
What can Duolingo do that SkySafari cannot?
Duolingo covers 40+ languages, Gamification, Streaks, Leaderboards. SkySafari covers Tiered editions, Telescope control, Large object catalogue, Event finder.

Answered from the vendors’ own pages

Duolingo: What is Duolingo's pricing model?

Duolingo offers free tier with ads and limited features, Super Duolingo at $12.99/month (ad-free, unlimited hearts, extra practice), Super Family at ~$119.99/year for up to 6 users, and Duolingo Max with AI features like Video Call and Roleplay.

Source
SkySafari: What is the difference between Basic, Plus and Pro?

Basic is a simple star chart, Plus adds a much larger catalogue and telescope control, and Pro adds an even larger catalogue and advanced planning tools.

Duolingo: Is Duolingo effective for language learning?

Duolingo has 135+ million monthly active users as of Q3 2025, making it the world's most widely used language-learning app. Its gamified approach and free tier have driven massive adoption.

Source
SkySafari: Can I upgrade from Basic to Plus later?

Not as a discounted upgrade; each tier is sold as a separate one-time purchase.

Duolingo: What AI features does Duolingo Max include?

Duolingo Max includes Video Call for conversation practice with AI character Lily and Roleplay for scenario-based speaking practice. As of January 2026, Explain My Answer became free for all users.

Source
SkySafari: Does it work with any telescope?

Only telescopes with compatible motorised mounts and a supported connection method can be controlled from the app.

Duolingo: Does Duolingo work offline?

Duolingo is primarily online, though it may offer limited offline lesson downloads on some platforms. Full features require internet connection.

Source
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