Kepler-138b Alternatives 2026 - Top Competitors Ranked

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Kepler-138b

Exoplanet Kepler Transiting Multi Planet Sub Earth Mars Sized

Kepler-138b is a Mars-sized exoplanet orbiting the red dwarf star Kepler-138, located roughly 217 light-years away in the constellation Lyra. Confirmed in 2015 using data from the Kepler space telescope, it was one of the smallest exoplanets to have both its mass and radius directly measured. This m...

8.0 Great

apps Top Kepler-138b Alternatives

The top alternative to Kepler-138b in 2026 is Kepler-138c with a score of 8.4/10, followed by Kepler-47b (8.3) and Kepler-138d (8.3).

Kepler-138c

Kepler-138c is a super-Earth exoplanet located in the Kepler-138 system, confirmed by NASA's Kepler space telescope in 2...

Water World Kepler Transiting Super Earth

8.4 Great

Kepler-47b

Kepler-47b is a transiting circumbinary exoplanet located in the Kepler-47 system, which was announced in 2012. It was p...

Kepler Transiting Neptune Class Multi Planet

8.3 Great

Kepler-138d

Kepler-138d is a transiting exoplanet orbiting the M-dwarf star Kepler-138 approximately 200 light-years from Earth. It...

Water World Kepler Transiting Super Earth

8.3 Great

Kepler-11b

Kepler-11b is a sub-Neptune exoplanet orbiting the Sun-like star Kepler-11, approximately 2,000 light-years from Earth....

Compact System Kepler Transiting Sub Neptune

7.8 Good

Kepler-444 b

Kepler-444 b is a rocky sub-Earth exoplanet orbiting the ancient K-type star Kepler-444, a system estimated to be approx...

Ancient Kepler Transiting Sub Earth

7.8 Good

Kepler-11c

Kepler-11c is an exoplanet orbiting the Sun-like star Kepler-11, located approximately 2,000 light-years from Earth in t...

Compact System Kepler Transiting Sub Neptune

7.7 Good

Kepler-11d

Third of six confirmed planets orbiting Kepler-11, part of the 2011 announcement that revealed how tightly packed planet...

Compact System Kepler Transiting Sub Neptune

7.6 Good

Kepler-47d

A circumbinary exoplanet discovered in 2019 using NASA's Kepler space telescope, notable for having the largest radius o...

Kepler Transiting Sub Neptune Multi Planet

7.6 Good

Kepler-11e

Kepler-11e is a sub-Neptune exoplanet orbiting the Sun-like star Kepler-11, discovered by NASA's Kepler space telescope....

Compact System Kepler Transiting Sub Neptune

7.5 Good

Kepler-11f

Kepler-11f is one of six known transiting planets orbiting the Sun-like star Kepler-11. Announced in 2011, it belongs to...

Compact System Kepler Transiting Sub Neptune

7.4 Good

Kepler-444 c

Kepler-444 c is a small transiting exoplanet in the five-planet Kepler-444 system. It is smaller than Earth and orbits c...

Ancient Kepler Transiting Sub Earth

7.4 Good

Kepler-11g

Kepler-11g is an extrasolar planet orbiting the sun-like star Kepler-11, located approximately 2,000 light-years from Ea...

Compact System Kepler Transiting Sub Neptune

7.3 Good

Kepler-444 d

Kepler-444 d is a confirmed sub-Earth exoplanet orbiting the K-type star Kepler-444. It belongs to a compact system whos...

Ancient Kepler Transiting Sub Earth

7.2 Good

Kepler-444 e

Kepler-444 e is a confirmed sub-Earth exoplanet in the Kepler-444 system, which orbits a metal-poor K-type star in the M...

Ancient Kepler Transiting Sub Earth

7.2 Good

Kepler-62b

Kepler-62b is the innermost known planet in the five-planet system orbiting Kepler-62, a K-type star. It was announced i...

Compact System Kepler Transiting Sub Neptune

6.5 Fair

Kepler-62c

Kepler-62c es uno de los cinco planetas conocidos del sistema Kepler-62, que orbita una estrella de tipo espectral K. Co...

Compact System Kepler Transiting Sub Neptune

5.5 Mediocre

Kepler-186b

Kepler-186b es el planeta más interior conocido del sistema Kepler-186, situado alrededor de una estrella enana roja. Es...

Hot Kepler Transiting Super Earth

5.5 Mediocre

Kepler-186c

Second planet in the five-planet Kepler-186 system, a super-Earth completing an orbit around its M-dwarf every ~7.3 days...

Warm Kepler Transiting Super Earth

5.3 Mediocre

Kepler-62d

Kepler-62d is a transiting planet in the five-planet Kepler-62 system, which orbits a K-type star. It has a radius estim...

Compact System Kepler Transiting Sub Neptune

5.2 Mediocre

Kepler-186d

Kepler-186d is the third known planet in the Kepler-186 planetary system, which orbits a cool M-type dwarf star. It comp...

Warm Kepler Transiting Super Earth

5.2 Mediocre

summarize Quick Comparison Summary

Alternative	Score	vs Kepler-138b	Action
Kepler-138c Exoplanet Water World Kepler Transiting	8.4 Great	+0.4	Compare
Kepler-47b Exoplanet Kepler Transiting Neptune Class	8.3 Great	+0.3	Compare
Kepler-138d Exoplanet Water World Kepler Transiting	8.3 Great	+0.3	Compare
Kepler-11b Exoplanet Compact System Kepler Transiting	7.8 Good	-0.2	Compare
Kepler-444 b Exoplanet Ancient Kepler Transiting	7.8 Good	-0.2	Compare
Kepler-11c Exoplanet Compact System Kepler Transiting	7.7 Good	-0.3	Compare
Kepler-11d Exoplanet Compact System Kepler Transiting	7.6 Good	-0.4	Compare
Kepler-47d Exoplanet Kepler Transiting Sub Neptune	7.6 Good	-0.4	Compare
Kepler-11e Exoplanet Compact System Kepler Transiting	7.5 Good	-0.5	Compare
Kepler-11f Exoplanet Compact System Kepler Transiting	7.4 Good	-0.6	Compare

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help Frequently Asked Questions

What are the best alternatives to Kepler-138b?

The top alternatives to Kepler-138b in 2026 include Kepler-138c, Kepler-47b, Kepler-138d, Kepler-11b, Kepler-444 b. Each offers unique features and is objectively scored on Lunoo to help you compare.

How does Kepler-138b compare to its competitors?

Our AI-powered comparison system analyzes features, pricing, user reviews, and expert opinions to provide objective scores. Kepler-138b scores 8.0/10. Click any alternative above to see a detailed side-by-side comparison.

Is Kepler-138b worth it in 2026?

Kepler-138b scores 8.0/10 on Lunoo, making it a highly-rated option in the Exoplanet category. However, alternatives like Kepler-138c may better suit specific needs.

What is the best free alternative to Kepler-138b?

Several alternatives to Kepler-138b offer free plans or free tiers. Check the alternatives listed above and visit their websites to compare pricing and free options.

Why should I switch from Kepler-138b?

Common reasons users look for Kepler-138b alternatives include pricing, specific feature gaps, better integration needs, or simply exploring newer options. Our objective scoring helps you compare without bias.

How many alternatives to Kepler-138b are there?

Lunoo currently lists 20 scored alternatives to Kepler-138b in the Exoplanet category, ranked by our AI-powered evaluation system.

Which Kepler-138b alternative has the highest rating?

Kepler-138c currently holds the highest rating among Kepler-138b alternatives with a score of 8.4/10.

Can I use Kepler-138c instead of Kepler-138b?

Kepler-138c is one of the top-rated alternatives to Kepler-138b. While they serve similar purposes in the Exoplanet space, each has distinct strengths. Use our comparison tool above for a detailed side-by-side analysis.

What is the cheapest alternative to Kepler-138b?

Pricing varies among Kepler-138b alternatives. We recommend checking each alternative's website for current pricing. Many options in the Exoplanet category offer free tiers or competitive pricing.

How are Kepler-138b alternatives ranked on Lunoo?

Lunoo uses an AI-powered scoring system that analyzes category fit, feature coverage, pricing signals, public reception, recency, and value to provide 0 to 10 scores. Rankings are updated continuously.

Kepler-138b vs Kepler-138c: which is better?

Kepler-138b scores 8.0/10 while Kepler-138c scores 8.4/10 on Lunoo. The best choice depends on your specific needs. Use our detailed comparison tool for a full breakdown.

Kepler-138b vs Kepler-47b: which is better?

Kepler-138b scores 8.0/10 while Kepler-47b scores 8.3/10 on Lunoo. The best choice depends on your specific needs. Use our detailed comparison tool for a full breakdown.

Kepler-138b vs Kepler-138d: which is better?

Kepler-138b scores 8.0/10 while Kepler-138d scores 8.3/10 on Lunoo. The best choice depends on your specific needs. Use our detailed comparison tool for a full breakdown.

swap_horiz Kepler-138b Alternatives

Kepler-138b

apps Top Kepler-138b Alternatives

Kepler-138c

Kepler-47b

Kepler-138d

Kepler-11b

Kepler-444 b

Kepler-11c

Kepler-11d

Kepler-47d

Kepler-11e

Kepler-11f

Kepler-444 c

Kepler-11g

Kepler-444 d

Kepler-444 e

Kepler-62b

Kepler-62c

Kepler-186b

Kepler-186c

Kepler-62d

Kepler-186d

summarize Quick Comparison Summary

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