Education · head to head
Rosetta Stone vs Sky Guide
Sky Guide
Education
iOS astronomy app that moved from a one-time purchase to a free-to-download, subscription-tiered model
- From
- Free
- Rated
- -
The short version
- Only Sky Guide has a free tier, so it costs nothing to try first.
- Each has a real cost: Rosetta Stone no pricing information available on homepage; requires navigating to /buy page; Sky Guide it is iOS-only, unlike SkySafari which also covers Android and desktop.
- They diverge on capability: Rosetta Stone covers Immersive learning, Sky Guide covers Light pollution forecasting.
- Prices and features above were last checked on 1 September 2026.
Where they differ
Only the attributes on which Rosetta Stone and Sky Guide actually diverge.
| Attribute | Rosetta Stone | Sky Guide |
|---|---|---|
| Starting price | $13.25/month | Free |
| Pricing model | Unknown | Free download with Plus and Pro subscription upgrades |
| Free tier | No | Yes |
| Platforms | Web, iOS, Android | iOS |
| Founded | 1992 | Unknown |
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 Rosetta Stone
- Immersive learning
- Speech recognition
- TruAccent
- Live tutoring
- Phrasebook
- Stories
- Audio companion
- Mobile apps
Only in Sky Guide
- Light pollution forecasting
- Meteor shower prediction
- Camera and gyroscope sky view
- Deep-sky object catalogue
- Extreme zoom
- Satellite tracking
What people use each for
The jobs each tool is most often brought in to do.
Rosetta Stone
- Language learning across 25+ languages with immersive methodnot Sky Guide
- Speech recognition practice via TruAccent toolnot Sky Guide
- Conversational fluency building through Chat Missionsnot Sky Guide
- Custom learning materials creation with Sapphire Studionot Sky Guide
- Professional and personal development language acquisitionnot Sky Guide
Sky Guide
- An iOS stargazer who wants light pollution forecasting to plan a dark-sky observing tripnot Rosetta Stone
- Someone tracking meteor showers and wanting a forecast of viewing conditionsnot Rosetta Stone
- A user who wants extreme zoom into deep-sky objects without owning a telescopenot Rosetta Stone
- A buyer comparing subscription astronomy apps on iOS specifically, rather than cross-platform toolsnot Rosetta Stone
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Rosetta Stone
- No pricing information available on homepage; requires navigating to /buy page
- Multiple membership tiers exist but pricing not displayed on main site
Sky Guide
- It is iOS-only, unlike SkySafari which also covers Android and desktop.
- It has moved from one-time purchase to a subscription model, and long-time users who paid once for earlier versions have criticised the change publicly.
- Pro tier pricing is high relative to Star Walk 2 for broadly similar core stargazing functionality.
- It has no telescope control, unlike SkySafari Plus and Pro, which limits it to naked-eye and camera-based observing.
- Its relationship to other apps under the same distribution platform is not clearly documented, which makes long-term support commitments harder to assess.
Pricing, plan by plan
Rosetta Stone
$13.25/monthNo published plan breakdown. See the Rosetta Stone review.
Sky Guide
Free- Sky GuideFree
- Base sky map and object labelling
- Sky Guide Plus$19.99/year
- Larger star and satellite catalogue
- Light pollution forecasting
- Meteor shower prediction
- Sky Guide Pro$39.99/year
- Very large deep-sky object catalogue
- Exoplanet data
- Extreme zoom
Which should you pick?
Choose Rosetta Stone if
- You need immersive learning.
- You work on Web, iOS, Android.
- You also want speech recognition.
Choose Sky Guide if
- You need light pollution forecasting.
- You want to start without paying.
- You work on iOS.
- You also want meteor shower prediction.
Questions people ask
- Is Rosetta Stone or Sky Guide better?
- Neither clearly leads. Rosetta Stone starts at $13.25/month and Sky Guide at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Rosetta Stone or Sky Guide?
- Sky Guide has a free tier; the other does not. Paid plans start at $13.25/month for Rosetta Stone and Free for Sky Guide.
- Does Rosetta Stone or Sky Guide run on more platforms?
- Rosetta Stone runs on Web, iOS, Android. Sky Guide runs on iOS.
- Can I use Sky Guide for free?
- Yes. Sky Guide has a free tier, so you can try it without paying. Rosetta Stone starts at $13.25/month.
- What is Rosetta Stone best used for?
- Rosetta Stone is most often used for language learning across 25+ languages with immersive method, speech recognition practice via truaccent tool, conversational fluency building through chat missions, custom learning materials creation with sapphire studio. Of those, language learning across 25+ languages with immersive method and speech recognition practice via truaccent tool are not what Sky Guide is typically brought in for.
- What can Rosetta Stone do that Sky Guide cannot?
- Rosetta Stone covers Immersive learning, Speech recognition, TruAccent, Live tutoring. Sky Guide covers Light pollution forecasting, Meteor shower prediction, Camera and gyroscope sky view, Deep-sky object catalogue.
Answered from the vendors’ own pages
Rosetta Stone: Where can I find Rosetta Stone pricing information?
Rosetta Stone pricing is not displayed on the main homepage. Customers must navigate to the membership purchase pages or click the JOIN NOW button to access pricing information for individual, enterprise, or school membership options. Source: https://www.rosettastone.com
SourceSky Guide: Is Sky Guide free?
The base app is free to download; Plus and Pro are subscription upgrades for a larger catalogue and forecasting features.
Sky Guide: Did Sky Guide used to be a one-time purchase?
Yes, earlier versions were sold as a one-time purchase before it moved to the current free-plus-subscription model.
Sky Guide: Does Sky Guide support telescope control?
No. For telescope control, SkySafari Plus or Pro is the better choice.
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