Interval? vs ArcEmu
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
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.
- Chord identification gameplay
- Musical notation display
- Multiple choice answers
- Scoring system with deductions
- Unlimited chord replays
- Progressive difficulty
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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.
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.
- Game Boy, GBC, GBA emulation
- Multiplayer support
- Cheat codes
- Customizable on-screen controls
- Save State sharing
- iCloud support
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ArcEmu brings retro game emulation to Apple Watch. It also works on iPhone, iPad, and Apple TV, delivering a seamless gaming experience across your Apple devices. Supported Consoles - Game Boy (.gb) - Game Boy Color (.gbc) - Game Boy Advance (.gba) - Pokémon Mini (.min) - Nintendo Entertainment System (.nes) - Super Nintendo Entertainment System (.sfc and .smc) - Atari 2600 (.a26 and .bin) Main Features - Accurate, high-performance emulation powered by the mGBA and Ares cores - Game Link Cable support with online multiplayer for up to four players* - Cheat-code support with a built-in database of popular codes** - Frame-independent emulation at 30 or 60 FPS - Multi-touch and Digital Crown support on Apple Watch - Support for all screen orientations on iPhone and iPad - Precise, thoughtfully designed on-screen controls - Customizable control position and transparency on iPhone and iPad - Fast-forward at 2×, 4×, or maximum speed - Slow motion at 0.5× speed - Touch-based light gun controls for NES and SNES - Custom color palettes for Game Boy games - Button hold/sustain feature - Accelerometer support - Gyroscope support on iPhone and iPad, with Digital Crown input on Apple Watch - Haptic feedback on iPhone - Game controller support with customizable button mappings - ZIP archive support - Automatic saving - Save-state sharing between devices - iCloud support for ROMs and save states - ROM sharing through iCloud using share codes - Support for Apple Watch devices configured with Family Setup - ROM sorting and search 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. You can import compatible ROM files from your iPhone and store them in iCloud. Your Apple Watch can then download them directly from iCloud. On an Apple Watch configured with Family Setup, ROMs can be downloaded from iCloud using share codes. Games Featured in the Screenshots - Acorn Grove: https://gibbongl.itch.io/acorn-grove - Anguna: https://gauauu.itch.io/anguna - Hauntsfield: https://alliemackie.itch.io/hauntsfield - µCity Advance: https://skylyrac.itch.io/ucity-advance * Requires a Game Center account. ** Cheat codes may cause unexpected behavior or affect game stability and save data. ArcEmu is not affiliated with, endorsed by, or sponsored by Nintendo. Nintendo and the names of its game systems are trademarks of Nintendo Co., Ltd.
Screenshots
Verdict
The clearest difference is update cadence: ArcEmu at every 2 weeks against Interval?'s every 7 months. ArcEmu also leads on device support (5 vs 3) and price ($1.99 vs $2.99). Interval?'s advantage is iOS requirement (12.0 vs 15.5). On ads, in-app purchases and chart position 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
Interval? costs $2.99 and ArcEmu $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Interval? ships an update every 7 months, ArcEmu every 2 weeks. The most recent releases landed on September 18, 2026 and October 3, 2026 respectively.
| Parameter | Interval? | ArcEmu |
|---|---|---|
| Price | $2.99 | $1.99 — better |
| Rating | — | 4.9 (1.3K ratings) — better |
| Positive reviews | — | 94.5% of reviews |
| Number of ratings | — | 1.3K — better |
| Update frequency | Every 7 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Best chart rank | #113 — better | #133 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Apple TV, Apple Watch — better |
| Requires iOS | 12.0 — better | 15.5 |
| Further details — not scored | ||
| Size | 18 MB | 172 MB |
| Age rating | 4+ | 4+ |
| Developer | Kelly 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
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- Add joystick/button support for Apple Watch
In-app purchases
Interval?
No in-app purchases
ArcEmu
No in-app purchases








