"Filter Designer" calculates multistage analog active filters.
Convenience, visibility and ability to find an optimal solution in minimum time.
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* Low-pass filters
* High-pass filters
* Band-pass filters
* Band-stop filters
* All-pass filters

Responses:
* Bessel
* Butterworth
* Chebyshev
* Linear Phase 0.05 degrees
* Linear Phase 0.5 degrees
* Gaussian to 6dB
* Gaussian to 12dB

Topologies:
* Real Pole Non-Inverting
* Real Pole Inverting
* Real Pole Fully Differential
* Multiple-Feedback, Single-Ended Input
* Multiple-Feedback, Fully Differential
* Multiple-Feedback, Differential Input for 2-nd order LP
* In-The-Loop, Single-Ended Input
* In-The-Loop, Fully Differential
* Sallen-Key
* RLC for 2-nd order LPF
* 3d and 4th order low-pass filter with one Op Amp
* 3d order high-pass filter with one Op Amp

Tuning of the values of all circuit components.

Monte-Carlo worst-case analysis

Reverse: calculation of filter parameters at known values of its components.

Auxiliary tools.

"Circuit Calculator" has the same user interface, so you can try "Circuit Calculator Demo" before you buy:
https://play.google.com/store/apps/details?id=com.vdv.circuitcalculator.demo