Comparison

Interval? vs ArcEmu

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

Head to head
About

Interval?

Test your ear for music by identifying chords. Play through puzzles where you'll hear three chords and see the notation for the first two. Select the correct third chord from four options to score points and improve your musical knowledge.

Highlights
  • Chord identification gameplay
  • Musical notation display
  • Multiple choice answers
  • Scoring system with deductions
  • Unlimited chord replays
  • Progressive difficulty
Features
Currently charting
Read full description

Challenge your musical skill with Interval by determining which chord was played. For each puzzle, three chords are played with the musical notation displayed for the first two. The third chord will be one of four choices displayed - choose your answer by touching the right chord. The point value for each game will be added to your score for the correct answer, but half the points will be deducted for each wrong one. You can play the three chords as many times as you like, and you can move on to the next puzzle without answering and without penalty. Your musical knowledge will increase with repeated playing of the game.

About

ArcEmu

Experience retro gaming on your Apple Watch, iPhone, and iPad. This emulator supports Game Boy, Game Boy Color, and Game Boy Advance cartridges. Enjoy features like multiplayer, cheats, and customizable controls.

Highlights
  • Game Boy, GBC, GBA emulation
  • Multiplayer support
  • Cheat codes
  • Customizable on-screen controls
  • Save State sharing
  • iCloud support
Features
Read full description

Turn your Apple Watch into a retro game console. Play Game Boy, NES, SNES, Genesis, and more on your wrist, with multi-touch controls and the Digital Crown. ArcEmu also runs on iPhone, iPad, and Apple TV. ▸ SUPPORTED CONSOLES Included for free: - Game Boy - Game Boy Color - Nintendo Entertainment System (NES) Available through in-app purchases: - Game Boy Advance - Pokémon Mini - Super Nintendo Entertainment System (SNES) - Atari 2600 - Sega Mega Drive / Genesis - Sega Master System - Sega Game Gear - Sega SG-1000 ▸ MULTIPLAYER AND LINK CABLE Play home-console games online and locally with friends, or link Game Boy and Game Boy Advance games over the internet. Game Link Cable supports up to four players in compatible games. Online play requires a Game Center account. ▸ SHARE ROMs WITH A CODE Import your ROMs on iPhone, keep them in iCloud, and download them directly to Apple Watch or Apple TV. Share them through iCloud using a code, including with an Apple Watch configured with Family Setup. ▸ SCREEN AND CONTROLS Move and resize the game screen, choose an LCD or CRT filter, and set up the controls the way you like them. On Apple Watch, use multi-touch controls, customize the control layout, and assign actions to the Digital Crown. On iPhone and iPad, adjust button positions and transparency, and play in any orientation. Connect a controller and customize its button mappings, or use a second controller on iPhone, iPad, and Apple TV. ArcEmu also supports iPhone Duo. ▸ MORE FEATURES - Accurate, high-performance emulation - Fast-forward at 2×, 4×, or maximum speed - Slow motion at 0.5× speed - Cheat codes with a built-in database of popular codes - Touch-based light gun controls for NES and SNES - Custom Game Boy color palettes - Button hold/sustain - Accelerometer support - Gyroscope support on iPhone and iPad, with Digital Crown input on Apple Watch - Haptic feedback on iPhone ▸ YOUR ROMs AND SAVES Keep your collection organized with per-console folders, sorting, and search. Import ROMs from ZIP and 7-Zip archives, use automatic saving, and share save states between devices. Both ROMs and save states can be stored in iCloud. ▸ APPLE WATCH COMPATIBILITY - Apple Watch Series 4 or later - Apple Watch SE or later - Apple Watch Ultra or later ArcEmu does not include any games or ROMs. ▸ GAMES FEATURED IN THE SCREENSHOTS - Acorn Grove: https://gibbongl.itch.io/acorn-grove - Big2Small: https://mdsteele.itch.io/big2small - Hauntsfield: https://alliemackie.itch.io/hauntsfield - µCity Advance: https://skylyrac.itch.io/ucity-advance Cheat codes may cause unexpected behavior or affect game stability and save data. ArcEmu is not affiliated with, endorsed by, or sponsored by Nintendo, Sega, or Atari. All trademarks belong to their respective owners.

Screenshots

Interval?3 screens
ArcEmu4 screens

Verdict

The call

The clearest difference is price: ArcEmu at Free against Interval?'s $2.99. ArcEmu also leads on update cadence (every 2 weeks vs every 7 months). Interval?'s advantage is in-app purchases (none vs 10) and chart position (#112 vs unranked). On ads and device support 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

ArcEmu is free to download; Interval? costs $2.99 up front. ArcEmu sells 10 one-off in-app purchases. Interval? asks for nothing beyond the download.

UpkeepUpdate frequency

Interval? ships an update every 7 months, ArcEmu every 2 weeks. The most recent releases landed on November 11, 2026 and November 12, 2026 respectively.

Scorecard6 real differences · 5 level
Interval? versus ArcEmu: the parameters behind the verdict, then further details
ParameterInterval?ArcEmu
Price$2.99Free — better
Rating—4.9 (1.4K ratings) — better
Positive reviews—94.6% of reviews
Number of ratings—1.4K — better
Update frequencyEvery 7 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree — better
Best chart rank#112 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, Apple TV, Apple Watch — better
Requires iOS12.0 — better16.0
Further details — not scored
Size18 MB234 MB
Age rating+44+
DeveloperKelly Technology Inc.Raffaele D'Amato

Bugs and requests

Interval?

Not enough reviews yet to summarise bugs or requests.

ArcEmu

Reported bugs

3 issues
  • Occasional crashes
  • Graphical glitches with certain ROMs
  • Save data not transferring properly between devices

Requested features

6 requests
  • Add cheat/GameShark support
  • Improve volume controls
  • Implement fast forward/slow motion options
  • Allow multiple save slots per game
  • Improve Game Boy Color support
Show 1 more
  • Add joystick/button support for Apple Watch

In-app purchases

None

Interval?

No in-app purchases

10 purchases

ArcEmu

One-time10
  • Unlock All (Upgrade 4)$0.99
  • Game Boy Advance$0.99
  • SNES$0.99
Show 7 more
  • Pokémon Mini$0.99
  • Atari 2600$0.99
  • Mega Drive / Genesis$0.99
  • Game Gear$0.99
  • Master System$0.99
  • SG-1000$0.99
  • Unlock All (Upgrade 3)$1.99

Questions

Is Interval? free?
Interval? costs $2.99, with no in-app purchases.
Is ArcEmu free?
ArcEmu is free to download, with in-app purchases available.
Do Interval? or ArcEmu have ads?
Neither Interval? nor ArcEmu shows ads.
Which is updated more often, Interval? or ArcEmu?
Interval? ships an update every 7 months, and ArcEmu every 2 weeks. Most recently, Interval? was updated on November 11, 2026 and ArcEmu on November 12, 2026.

Other comparisons