Comparison

What Day?? vs SpatialEMU

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

Head to head
About

What Day??

Features
Read full description

Features: Check the day of the week for any date from 1800 to 2300. Easy and fun to use. Great for planning birthdays, events, and more. Download now and always know your days!

About

SpatialEMU

This app allows you to play your personal retro game collection on iPhone and iPad. It supports a wide range of classic systems and offers flexible control options, including virtual buttons and physical controllers. You can load games locally or connect to a self-hosted server for library management.

Highlights
  • Play retro games on iOS devices
  • Supports NES, SNES, PlayStation, PSP, and more
  • Load local game files or use a self-hosted server
  • Virtual and physical controller support
  • Customizable controller mapping
  • Local save states and progress syncing
Features
Read full description

SpatialEMU brings your own retro game library to iPhone and iPad. Organize a personal local collection, choose how each game is presented, and play with touch controls or supported physical game controllers. SUPPORTED SYSTEMS Play user-provided games for NES, SNES, Game Boy, Game Boy Color, Game Boy Advance, Nintendo DS, Mega Drive / Genesis, SEGA 32X, Master System, Game Gear, SG-1000, PlayStation, PSP, DOS, Neo Geo, CPS arcade systems, SEGA Model 2, SEGA Model 3, and supported MAME arcade hardware. Compatibility varies by title, file format, and required system files. LOAD LOCAL FILES OR USE YOUR OWN SERVER No server is required: open local games directly with the system document picker. FolioSpace Library is an optional, self-hosted personal library and is not part of the SpatialEMU client. It can run on a NAS or on a Docker-capable Mac, PC, or Linux host. Connect to your own server to browse, search, filter, and selectively download your catalog, save multiple server profiles, and synchronize supported battery saves and play records. PLAY YOUR WAY Use the app's virtual controls or supported Xbox, PlayStation, Nintendo, and other game controllers. Universal controller mapping supports global, per-system, and per-game profiles, button reassignment, axis inversion, dead zones, and sensitivity. SpatialEMU also provides Nintendo DS touch input, DOS keyboard and mouse controls, and specialized controls for supported arcade and mahjong titles. LOCAL-NETWORK CABINET LINK Supported SEGA Model 3 titles can create native cabinet-link sessions across multiple devices. Every device runs the same user-provided game locally while the LAN carries only cabinet-link data. Some larger room layouts remain clearly labeled experimental. LOCAL PROGRESS Keep local battery saves and save states for supported systems. Store separate progress for each game and synchronize supported save records through your own FolioSpace Library. IMPORTANT SpatialEMU does not include games, ROMs, BIOS files, firmware, encryption keys, copyrighted game content, or downloads for such content. You must provide files you have the right to use. Compatibility does not imply affiliation with the relevant hardware or game publishers. FolioSpace connection guide: https://spatialemu.com/guides/foliospace-connection/ Open-source notices and corresponding source: https://github.com/funland/SpatialEMU-Source Apple Standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ FREE FEATURES AND OPTIONAL PURCHASES Supported NES, SNES, Mega Drive / Genesis, GB, GBC, GBA, and all supported FBNeo systems (including CPS1, CPS2, CPS3 and Neo Geo) do not require Prime. Prime unlocks additional supported systems through a monthly subscription, annual subscription, or one-time lifetime purchase. Compatibility varies by game and platform. Subscriptions renew automatically unless canceled. Eligible earlier purchasers retain permanent Prime access after purchase-history verification. Purchasing lifetime Prime does not automatically cancel an existing subscription. Prices and purchase options appear in the app.

Screenshots

What Day??3 screens
SpatialEMU2 screens

Verdict

The call

The clearest difference is price: SpatialEMU at Free against What Day??'s $9.99. SpatialEMU also leads on update cadence (every 11 days vs every 5 weeks) and device support (6 vs 3). What Day??'s advantage is iOS requirement (14.0 vs 18.0). On ads and in-app purchases 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

SpatialEMU is free to download; What Day?? costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

What Day?? ships an update every 5 weeks, SpatialEMU every 11 days. The most recent releases landed on October 7, 2026 and October 8, 2026 respectively.

Scorecard4 real differences · 6 level
What Day?? versus SpatialEMU: the parameters behind the verdict, then further details
ParameterWhat Day??SpatialEMU
Price$9.99Free — better
Rating—5.0 (1 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—1 — better
Update frequencyEvery 5 weeksEvery 11 days — better
AdsNoNo
In-app purchasesNoNo
Monetization—Paid
DevicesiPhone, iPad, iPodiPhone, iPad, Mac, Apple TV, Apple Watch, Vision Pro — better
Requires iOS14.0 — better18.0
Further details — not scored
Size5 MB388 MB
Age rating4+4+
DeveloperPieter Yoshua Natanael晓东 傅

In-app purchases

None

What Day??

No in-app purchases

None

SpatialEMU

No in-app purchases

Questions

Is What Day?? free?
What Day?? costs $9.99, with no in-app purchases.
Is SpatialEMU free?
SpatialEMU is free to download, with no in-app purchases.
Do What Day?? or SpatialEMU have ads?
Neither What Day?? nor SpatialEMU shows ads.
Which is updated more often, What Day?? or SpatialEMU?
What Day?? ships an update every 5 weeks, and SpatialEMU every 11 days. Most recently, What Day?? was updated on October 7, 2026 and SpatialEMU on October 8, 2026.

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