Comparison

Planet Formula vs SoundEcho

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

Planet Formula

Embark on a celestial match-3 adventure across the Solar System. Solve 125 unique puzzles by earning points, breaking ice, or collecting coins within a limited number of moves. Utilize powerful planet combinations and strategic moves to overcome challenges.

Highlights
  • 125 unique match-3 levels
  • Special power-up planets
  • Strategic move mechanics
  • Ice tile and wall breaking
  • VoiceOver accessibility
  • T-chain and L-chain combinations
Read full description

Explore the Solar System in Planet Formula, a match-3 puzzle game featuring 125 unique levels with engaging objectives. Complete each level by earning points, breaking ice tiles, or collecting coins—all within a set number of moves. Earn special power-ups: - Magic Planets: Match five planets in a row or column to create a magic planet. Swap it to clear all planets of the same type on the board and score big. - Special Planets: Match four planets to create a special planet with a white border. Use it in a match to clear an entire row or column. - Discover combinations like T-chains and L-chains for massive point boosts. Break ice by clearing planets underneath, and remove walls by eliminating adjacent planets. Be strategic — walls grow if no nearby planets are destroyed in the previous move. Accessibility Features: Planet Formula is designed with VoiceOver users in mind: - Tap a grid cell to hear the planet’s type and position. - To move a planet, select it with a single tap, then double-tap to start moving. - Choose the destination with another tap and confirm with a double-tap to complete the move. With simple mechanics and thoughtful design, Planet Formula offers an enjoyable, relaxing experience — perfect for playing at home, during a break, or while commuting. Challenge yourself, earn points, and rise through the ranks in this solar system-inspired puzzle adventure.

About

SoundEcho

A fun and accessible memory game using sound cues. Players match pairs of buttons that produce the same sound to clear the board. Supports multiple sound themes and player counts, with Game Center integration.

Highlights
  • Sound-based memory matching
  • VoiceOver accessibility
  • Animal and computer sound themes
  • Multiple difficulty levels (10, 15, 20 sounds)
  • 2-4 player real-time multiplayer
  • Game Center integration
Features
Read full description

SoundEcho is a memory game with sounds that is easy to play and fully accessible with VoiceOver. SoundEcho is enjoyable for blind, low vision and sighted players alike. The gameplay is simple. Buttons showing a letter, number or smiley are spread across the screen. Tap a button to hear a sound. If two different buttons produce the same sound, they disappear. Find all matching sounds as quickly as possible with as few taps as you can. Choose from 4 sound categories: the classic animal and computer sounds, or the alternative traffic and musical instrument sounds. Each game contains 10, 15 or 20 sound pairs. SoundEcho integrates Game Center so you can compare scores, track achievements and play real-time matches with 2 to 4 players. SoundEcho was nominated for the 2023 Golden Apple Awards by the AppleVis website. Try SoundEcho for free today.

Screenshots

Planet Formula4 screens
SoundEcho3 screens

Verdict

The call

The clearest difference is rating: Planet Formula at 5.0 against SoundEcho's 4.3. Planet Formula also leads on device support (4 vs 2) and iOS requirement (13.0 vs 17.0). SoundEcho's advantage is ads (none vs shown) and monetization model (free vs free with in-app purchases). On price, review sentiment, ratings volume and update cadence there is nothing between them.

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Planet Formula sells 3 one-off in-app purchases and SoundEcho sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Planet Formula holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 3 and 3 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

Planet Formula ships an update every 2 months, SoundEcho every 5 weeks. The most recent releases landed on October 9, 2026 and September 25, 2026 respectively.

Scorecard5 real differences · 5 level
Planet Formula versus SoundEcho: the parameters behind the verdict, then further details
ParameterPlanet FormulaSoundEcho
PriceFreeFree
Rating5.0 (3 ratings) — better4.3 (3 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings33
Update frequencyEvery 2 monthsEvery 5 weeks — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad
Requires iOS13.0 — better17.0
Further details — not scored
Size20 MB7 MB
Age rating4+12+
Developerx2line.com LLCKristof Nijs

Customer experience

Planet Formula

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

SoundEcho

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

3 purchases

Planet Formula

One-time3
  • Extra 4 Moves$1.99
  • Extra 8 Moves$2.99
  • Extra 15 Moves$3.99
1 purchases

SoundEcho

One-time1
  • Purchasing the app$4.49

Questions

Is Planet Formula free?
Planet Formula is free to download, with in-app purchases available.
Is SoundEcho free?
SoundEcho is free to download, with in-app purchases available.
Which has better reviews, Planet Formula or SoundEcho?
Planet Formula is rated higher. Planet Formula averages 5.0 out of 5 from 3 ratings, while SoundEcho averages 4.3 from 3 ratings.
Do Planet Formula or SoundEcho have ads?
Planet Formula shows ads; SoundEcho does not.
Which is updated more often, Planet Formula or SoundEcho?
Planet Formula ships an update every 2 months, and SoundEcho every 5 weeks. Most recently, Planet Formula was updated on October 9, 2026 and SoundEcho on September 25, 2026.

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