Comparison

AltiSpace 2 vs 4i Player

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

Head to head
About

AltiSpace 2

This app offers advanced convolution reverb with realistic acoustic simulations and famous hardware device presets. It allows users to import their own impulse responses and provides extensive controls for EQ, gating, modulation, and more to shape unique sounds.

Highlights
  • Import custom impulse response files
  • Library of famous hardware reverb presets
  • Advanced EQ, gate, and ducking controls
  • Modulation and pitch shifting effects
  • MIDI controller support
  • Stereo and mono input processing
Features
Read full description

AltiSpace is a convolution reverb app with advanced controls that provides realistic sounding natural acoustic space or the most famous reverb devices for any track or mix. A convolution reverb takes a captured sample (called an impulse response) from a real-world space or hardware and uses this to digitally simulate the reverberation of that space or device down to the last detail and nuance. Because it is sampled, not synthesized, convolution reverb is known for its stunning realism, and it is widely considered to be the best type of reverb. However, unlike the more common algorithmic reverbs, convolution reverbs usually does not have much control over the reverberation process. But AltiSpace, in addition to the ability to load your own impulse response files and a built-in library of real reverb device presets, has advanced settings such as EQ, gate, ducking, modulation and more. You can change the original impulse response parameters to something completely new and then save it as a new preset. This app has an easy-to-use user interface, where all the main controls are located on the single screen, and it is ready to use right out of the box, even without additional settings. And at the same time, you can easily change the parameters of the impulse responses from the built-in library to create your own sound. App features: Ability to import your own impulse response files. A large built-in library of presets from the most famous hardware reverbs. Convenient preset manager with the ability to group and search presets. Presets can be marked as favorites for display in the favorites group. Supports MIDI controllers (also Bluetooth) with learn or manually assign mode. Reverb can work with a stereo or mono input and convert it to stereo. Add dynamic noise before reverb for a more natural sound. The gate allows you to turn on the reverb when the threshold is exceeded. The ducking allows you to turn off the reverb when the threshold is exceeded. Sets the minimum reverb level for Gate and Ducking modes. Equalizer with high and low cut filters in chain before or after reverb. Changing the time (length) of the current impulse response. Possibility to set a fade out point for a smooth end of the impulse response. Sets the pre-delay time of the signal before reverb. Experimental feature to change the pitch of the impulse response. Amplifying early or late reflections. Adjusts the stereo image before the reverb. Haas effect for adding stereo space to a mono signal. Sets the depth and frequency of modulation the signal before reverb. Mixing dry / wet signal and adjusting the output level. Four-channel mode for better stereo ambience. Input and output level meters. Indicators of possible input clipping for standalone. Prevents any output clipping for standalone. Built-in full description of all controls. Demo: https://www.youtube.com/watch?v=WBHxgjkGCoU https://www.youtube.com/watch?v=GLNi9wHaGew https://www.youtube.com/watch?v=A3RPopor9gI AltiSpace is a universal application for iOS and macOS. It can work on iPhone and iPad as well as Mac / MacBook with M1 chip (and later). AltiSpace works on iPhone and iPad standalone, as an Audio Unit or Inter-App Audio module, and supports Audiobus. On MacOS, AltiSpace can works both as a standalone application and as an Audio unit (AUv3) with DAWs and other hosts that support AUv3 plugins. AltiSpace has a built-in detailed description of all parameters also available as PDF file on the application site. You can find more information on AltiSpace and other creative audio apps at: https://motion-soundscape.blogspot.com

About

4i Player

Features
Read full description

Experience music like never before with 4i Player, the ultimate high-performance player built for independent tracks and official music videos. Whether you are discovering new releases, curating your personal queue, or switching seamlessly between audio and video modes, 4i Player keeps your media flowing without interruption. Designed with a sleek, modern layout, 4i Player delivers crystal-clear audio, smooth HD video streaming, and full background playback so your favorite songs never miss a beat. KEY FEATURES Audio & Video Switch: Toggle between track audio and HD music videos with a single tap, picking up right where you left off. Synced Lyrics: Sing along or follow your favorite tracks with real-time, synchronized lyrics. Smart Up-Next Queue: Keep the music going with intuitive auto-queueing and seamless background playback. Custom Playlists: Build, manage, and edit custom playlists on the fly to fit every mood or activity. Lightning-Fast Search: Find trending releases, hidden gems, albums, and independent artists in seconds. Global Mini-Player: Effortlessly control playback from anywhere in the app. External Speaker Support: Enjoy seamless connectivity with home speakers and Sonos integration.

Screenshots

AltiSpace 24 screens
4i Player4 screens

Verdict

The call

The clearest difference is price: 4i Player at Free against AltiSpace 2's $7.99. 4i Player also leads on update cadence (every 9 days vs monthly). AltiSpace 2's advantage is iOS requirement (13.4 vs 15.1). On ads, in-app purchases 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

4i Player is free to download; AltiSpace 2 costs $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

AltiSpace 2 ships an update monthly, 4i Player every 9 days. The most recent releases landed on October 13, 2026 and October 16, 2026 respectively.

Scorecard3 real differences · 7 level
AltiSpace 2 versus 4i Player: the parameters behind the verdict, then further details
ParameterAltiSpace 24i Player
Price$7.99Free — better
Rating4.7 (29 ratings) — better—
Positive reviews77.8% of reviews—
Number of ratings29 — better—
Update frequencyMonthlyEvery 9 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.4 — better15.1
Further details — not scored
Size227 MB37 MB
Age rating4+12+
DeveloperIgor VasilievNiels Brinch

In-app purchases

None

AltiSpace 2

No in-app purchases

None

4i Player

No in-app purchases

Questions

Is AltiSpace 2 free?
AltiSpace 2 costs $7.99, with no in-app purchases.
Is 4i Player free?
4i Player is free to download, with no in-app purchases.
Do AltiSpace 2 or 4i Player have ads?
Neither AltiSpace 2 nor 4i Player shows ads.
Which is updated more often, AltiSpace 2 or 4i Player?
AltiSpace 2 ships an update monthly, and 4i Player every 9 days. Most recently, AltiSpace 2 was updated on October 13, 2026 and 4i Player on October 16, 2026.

Other comparisons