Slab vs Sampledex Effect Shift
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Slab
This app models a steel plate reverb, offering a unique, physically simulated sound. Control decay, tone, and predelay, with options for stereo or mono pickups. It can be used standalone or with AUv3 hosts.
- Physically modeled steel plate reverb
- Adjustable decay, tone, and predelay
- Stereo and mono pickup options
- Swell foot for building reverb
- Physical damper control
- Integrated amp stage
- AUv3 and standalone operation
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Slab is a physically modelled steel plate reverb. Not a room pretending to be a plate. Not an impulse response. A sheet of steel the size of a door - 25,000 resonant modes, all worked out at once, under everything you play. It's a lot of metal for 99¢. LET IT RING Hold the SWELL foot and the reverb keeps building. Every note adds more energy to the plate. Keep playing and the sound gets bigger, then bigger, then completely out of hand. There is no reason to stop. So don't. DAMP IT Real plate reverbs have a damper. Slab does too. Hit DAMP and a felt pad drops onto the steel, choking the vibration almost instantly. It's not a fake decay control - the plate stops because something stopped it. PICK YOUR PICKUPS • STEREO - twin pickups on opposite sides of the plate for a wide, moving image. • MONO - one pickup, like the original single-output designs. Same plate, different perspective. AND THE KNIFE SWITCH Throw it to drive the signal into the plate through a measured amp stage - warm, dark and genuinely dirty when you dig in. THE CONTROLS • DECAY - how long the steel keeps moving (0.3-10 s). • TONE - the damper's resting position, from lifted-and-bright to pressed-and-dark. • PREDELAY - the gap before the plate speaks. • MIX - a host parameter that adjusts the plate level around the dry signal. PERFORMANCE MODE Open Help and enable Performance Mode for an alternative plate sound that uses less processing power. The original physical model remains the default. WORKS EVERYWHERE • AUv3 plug-in for GarageBand, Logic Pro, AUM, Cubasis and other AUv3 hosts on iPad and iPhone • Standalone app - plug in and play, no DAW needed • MIDI control in standalone; parameter automation in compatible hosts • One purchase covers iPad, iPhone and the Mac app, with AUv3 support in compatible hosts. A real plate is enormous, heavy, and hungry for maintenance. Slab is a few megabytes.
Sampledex Effect Shift
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Give your sound a new direction. Sampledex Effect Shift brings 50 effect choices, seven hands-on macro controls and the seven-band Bender EQ to iPhone and iPad. Add drive to a drum loop, movement to a synth or space around a melody, then shape the result to fit your track. FIND A STARTING POINT Choose from 51 factory presets: Default plus a starting sound for each of the 50 effects. A factory preset recalls a complete sound. Use the separate effect menu when you want to change the algorithm while keeping your other settings. CHOOSE YOUR CHARACTER Explore drive, digital textures, filters, chorus, flanging, phasing, tremolo, ring modulation, delay and reverb. Start with an effect, then turn Amount, Tone, Time, Mix, Dimension, Sparkle and Output to make it your own. SHAPE IT WITH BENDER EQ Follow seven colored band curves and their numbered handles. Select a band to adjust frequency, gain and Q directly. Use Fine for smaller graph movements, or lock dragging to frequency or gain. High-pass, low-pass and Prism controls give you more ways to shape the response. COMPARE AND KEEP YOUR IDEAS Use EQ A/B to compare two settings and copy a favorite into the other slot. Save the full sound as a preset and import or export preset documents when moving between your workflows. Each instance keeps its own sound in your host's project state. BUILT FOR TOUCH Move between Effects, Bender EQ and Advanced pages. Scroll to reach every control, enter a precise value or turn a textured macro knob. Switch Light or Dark directly from the touch header, or use the theme menu in Advanced. Your theme and settings return when the instance is restored. BRING IT INTO YOUR MUSIC WORKFLOW The included AUv3 audio effect extension loads in compatible hosts. The containing app also offers live input processing: connect headphones or an audio interface, then enable live input. Microphone permission is requested when you enable input. Your host manages audio when you use the extension. GO FURTHER Explore HoloRune character, spatial modes, EQ routing, parallel mix and Mid/Side levels in Advanced. Sidechain ducking requires a compatible host and a routed sidechain source.
Screenshots
Verdict
The clearest difference is price: Sampledex Effect Shift at Free against Slab's $0.99. On ads, in-app purchases, device support and iOS requirement 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
Sampledex Effect Shift is free to download; Slab costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | Slab | Sampledex Effect Shift |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 4.6 (5 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 5 — better | — |
| Update frequency | Every 6 days | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 39 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | Joshua Rideout | Robert Clemons |
In-app purchases
Slab
No in-app purchases
Sampledex Effect Shift
No in-app purchases









