Filterpole: Filter Design
Filter Pole Notebook
$4.99 · Designed for iPad. Not verified for macOS.
Monte Carlo your filter before the parts bin does: E-series snapping, quantized biquad poles, P05-P95 envelopes, and yield with honest confidence bounds.
The nominal curve passes; the production batch does not. An anti-alias RC that sits exactly on its corner on paper drifts across the requirement line once 5% capacitors arrive, and a biquad that looked clean in floating point grows passband ripple - or an unstable pole - after its coefficients are rounded to fixed point. Filterpole works in that gap between the textbook response and the response your components will actually build.
Work moves through four instrument surfaces:
1. SPEC - choose analog RC (low/high-pass) or digital biquad (low, high, band-pass, notch); enter values, tolerances, distributions, and dB requirement bands on a log-frequency grid.
2. REALIZE - component values snap to the E12/E24/E96 preferred series; digital designs show quantized coefficients and a pole-zero map that redraws as you step precision from 4 to 30 fractional bits.
3. ENVELOPE - a seeded Monte Carlo study sweeps your stated component spreads and plots the P05-P95 production envelope against every band, with estimated yield and a Wilson 95% interval.
4. RUNS and PACKET - inspect the worst observed sample and each requirement crossing, then export the study as JSON, CSV, or a PDF evidence packet.
Every study is reproducible from its stated seed and carries a SHA-256 checksum, and editing any input visibly invalidates the previous result, so a stale plot can never pose as current evidence. Figures are sampled-model estimates for study, not production sign-off. Projects live solely in the app's local container on your device; Filterpole makes no network connections and requests no permissions.
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The developer, Robert Corbin, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
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Information
- Provider
- Robert Corbin
- Size
- 3.9 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Robert Corbin
