Comparison

Slanguage vs SkyEngine

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

Slanguage

Features
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The Slanguage series (slang + language = Slanguage) for the "US of A"! Inside there are over 1,600 words and phrases commonly used in the USA! Great fun!

About

SkyEngine

Features
Read full description

SkyEngine is a realistic night sky viewer that transforms your phone into a portable planetarium. Whether you're camping under the stars or winding down for sleep, SkyEngine brings the beauty of the night sky to your fingertips. Point your phone at the sky and see exactly what's above you. SkyEngine uses your GPS location and compass to show an accurate, real-time view of stars, planets, and constellations from wherever you are. FEATURES Realistic Sky Rendering โ€” Thousands of real stars rendered with accurate positions and brightness โ€” Planets including the Moon, visible in their true locations โ€” The Milky Way stretching across your sky โ€” Realistic sky colors from sunset through deep night Compass Mode โ€” Point your phone at the sky and the view follows โ€” Labels appear on stars and planets as you look around โ€” Constellation lines guide you through the night sky Ambient Sounds & Sleep Mode โ€” Campfire crackling, crickets, wind, water, and calming drone music โ€” Mix and match sounds to create your perfect atmosphere โ€” Sleep timer with gentle fade-out (15, 30, 60, or 90 minutes) Visual Effects โ€” Shooting stars streak across the sky at random โ€” Aurora Borealis shimmering on the horizon โ€” Warm campfire glow from below Customization โ€” Adjust light pollution (Bortle 1โ€“9) to match your real sky โ€” Search any city worldwide to see its sky โ€” Time controls: jump forward, backward, or animate the sky at any speed โ€” Toggle constellations, labels, deep sky objects, and grid overlay Perfect for camping trips, bedtime relaxation, astronomy learning, or simply enjoying the beauty of the night sky from anywhere.

Screenshots

Slanguage3 screens
SkyEngine4 screens

Verdict

The call

The clearest difference is ads: SkyEngine at none against Slanguage's shown. SkyEngine also leads on update cadence (every 8 days vs every 5 months). Slanguage's advantage is iOS requirement (13.1 vs 17.6). On price, in-app purchases and device support there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Slanguage ships an update every 5 months, SkyEngine every 8 days. The most recent releases landed on September 29, 2026 and October 9, 2026 respectively.

Scorecard3 real differences ยท 3 level
Slanguage versus SkyEngine: the parameters behind the verdict, then further details
ParameterSlanguageSkyEngine
PriceFreeFree
Update frequencyEvery 5 monthsEvery 8 days โ€” better
AdsYesNo โ€” better
In-app purchasesNoNo
DevicesiPhone, iPod โ€” betteriPhone
Requires iOS13.1 โ€” better17.6
Further details โ€” not scored
Size45 MB23 MB
Age rating12+4+
DeveloperIncelligence, Inc.ZIRUI LYU

In-app purchases

None

Slanguage

No in-app purchases

None

SkyEngine

No in-app purchases

Questions

Is Slanguage free?
Slanguage is free to download, with no in-app purchases.
Is SkyEngine free?
SkyEngine is free to download, with no in-app purchases.
Do Slanguage or SkyEngine have ads?
Slanguage shows ads; SkyEngine does not.
Which is updated more often, Slanguage or SkyEngine?
Slanguage ships an update every 5 months, and SkyEngine every 8 days. Most recently, Slanguage was updated on September 29, 2026 and SkyEngine on October 9, 2026.

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