LogSynth vs SL Prism
Price, ratings, monetisation and update history for both apps, side by side ā with what reviewers say about each.
LogSynth
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LogSynth is a polyphonic virtual-analog synthesizer built for people who care what's actually happening in the signal path, not just what the preset browser looks like. Every voice runs five anti-aliased oscillators (sine, triangle, saw, pulse with PWM, and a band-limited impulse train) plus a dedicated sub-oscillator and noise source, mixed per-voice with independent amp envelopes. Chunky oscillators, crisp effects and a zero-delay-feedback state-variable filter ā switchable low/high/bandpass. The drive effect is powered by a physically modeled diode circuit, numerically integrated rather than a lookup-table approximation, so pushing it into saturation behaves the way an actual analog drive would. FEATURES - 8-voice polyphony, 5 oscillators + sub + noise per voice - Zero-delay-feedback state-variable filter with resonant feedback and diode drive saturation - 5 independent oscillator envelopes plus a dedicated filter envelope - 2 assignable LFOs and an 8-slot modulation matrix - Built-in chorus, delay, FDN reverb, and 4-mode distortion - 41 factory presets across Bass, Lead, Pluck, and Effects - One-tap patch randomizer with adjustable intensity - Real-time oscilloscope, on-screen keyboard, and CoreMIDI input - Runs standalone or as an AUv3 instrument inside AU hosts Whether you're sound designing from scratch or dropping it into a DAW as a plugin, Logsynth gives you the same engine everywhere ā no watered-down mobile version, no feature gating between standalone and plugin modes.
SL Prism
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SL Prism is a precise, fast, touch-ready equalizer for corrective mixing and creative sound shaping. Create a band directly on the spectrum. Move it to set frequency and gain, then refine Q, filter shape, channel routing, dynamics, threshold, attack, and release. Every enabled response stays visible while you work. Use dynamic EQ to control frequencies only when they become a problem. Enable spectral processing for more focused reactions. Switch between Zero Latency, Natural Phase, and Linear Phase modes to match recording, mixing, and phase-sensitive work. Features: ⢠24 independent EQ bands ⢠Nine filter types ⢠Dynamic and five-slice spectral processing ⢠Stereo, Left, Right, Mid, and Side routing ⢠External sidechain support in compatible hosts ⢠Realtime input, output, masking, and combined analyzers ⢠EQ Match and resonance suggestions ⢠A/B comparison, Undo, Redo, Auto Gain, Pan, Phase Invert, and Mix ⢠Factory effects including Underwater, Telephone, Airy Vocal, Warm Vintage, and Lo-Fi Radio ⢠AUv3 plugin and standalone app ⢠Scalable interface for iPad Audio is processed locally on the device. Core EQ processing does not upload project audio.
Screenshots
Verdict
The clearest difference is price: LogSynth at $9.99 against SL Prism's $19.99. SL Prism's advantage is iOS requirement (15.0 vs 18.0). On update cadence, ads, in-app purchases and device support there is nothing between them.
Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS
LogSynth costs $9.99 and SL Prism $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.
LogSynth ships an update every 2 weeks, SL Prism every 10 days. Both last shipped on October 29, 2026.
| Parameter | LogSynth | SL Prism |
|---|---|---|
| Price | $9.99 ā better | $19.99 |
| Update frequency | Every 2 weeks | Every 10 days ā better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPad, iPod ā better |
| Requires iOS | 18.0 | 15.0 ā better |
| Further details ā not scored | ||
| Size | 22 MB | 18 MB |
| Age rating | 4+ | 4+ |
| Developer | SEAN IAN HALENWOOD | VIACHESLAV ZHILTSOV |
In-app purchases
LogSynth
No in-app purchases
SL Prism
No in-app purchases








