Comparison

LogSynth vs SL Prism

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

Head to head
About

LogSynth

Features
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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 — 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 — no watered-down mobile version, no feature gating between standalone and plugin modes.

About

SL Prism

Read full description

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

LogSynth3 screens
SL Prism3 screens

Verdict

The call

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

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

LogSynth costs $9.99 and SL Prism $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

LogSynth ships an update every 2 weeks, SL Prism every 10 days. Both last shipped on October 29, 2026.

Scorecard2 real differences Ā· 4 level
LogSynth versus SL Prism: the parameters behind the verdict, then further details
ParameterLogSynthSL Prism
Price$9.99 — better$19.99
Update frequencyEvery 2 weeksEvery 10 days — better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.015.0 — better
Further details — not scored
Size22 MB18 MB
Age rating4+4+
DeveloperSEAN IAN HALENWOODVIACHESLAV ZHILTSOV

In-app purchases

None

LogSynth

No in-app purchases

None

SL Prism

No in-app purchases

Questions

Is LogSynth free?
LogSynth costs $9.99, with no in-app purchases.
Is SL Prism free?
SL Prism costs $19.99, with no in-app purchases.
Do LogSynth or SL Prism have ads?
Neither LogSynth nor SL Prism shows ads.
Which is updated more often, LogSynth or SL Prism?
LogSynth ships an update every 2 weeks, and SL Prism every 10 days. Most recently, LogSynth was updated on October 29, 2026 and SL Prism on October 29, 2026.

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