# Tersa: Circuit Simulator — Analog, Digital & RF Design

> Analog, Digital & RF Design (iPhone/iPad app by Denis Kosov.)

- Source: https://appshunter.io/ios/app/tersa-circuit-simulator/id6805903884 (this page in markdown: same URL + `.md`)
- Developer: [Denis Kosov](https://appshunter.io/developer/1563252853)
- Category: Developer Tools, Education
- Price: Free
- Age rating: 4+
- Requires: iOS 13.0 · 114 MB
- Languages: Russian, American English, Korean, German (Germany), Chinese (Simplified, China), Japanese
- Released: 2026-09-20
- Data updated: 2026-09-30
- User reviews in markdown: https://appshunter.io/ios/app/tersa-circuit-simulator/id6805903884/reviews.md

## What is Tersa?

Tersa is an electronic design workspace for analog, digital, mixed-signal, and RF circuit simulation on iPhone.

Draw a schematic, configure an analysis, inspect measurements, and adjust component values in one focused mobile workflow.

SCHEMATIC EDITOR

Create circuits using analog and digital components, sources, ports, wires, net labels, and reusable project sheets. The touch-friendly editor is designed for circuit creation and review on a mobile device.

SPICE-COMPATIBLE SIMULATION

Run analog, digital, and mixed-signal simulations using a SPICE-compatible engine. Explore operating points, sweeps, frequency response, transient behavior, logic states, and interactions between analog and digital parts of a circuit.

MEASUREMENTS AND PLOTS

Inspect voltages, currents, logic signals, frequency responses, traces, and derived measurements using configurable charts. Add markers and compare signals without leaving the project workspace.

RF ANALYSIS

Work with S11, S21, S12, and S22 parameters. Inspect return loss, insertion loss, impedance, gain, stability metrics, and Smith chart trajectories for filters, matching networks, resonators, and other RF circuits.

COMPONENT TUNING

Adjust component values and see how they affect the simulated circuit response. Explore alternatives without repeatedly rebuilding the schematic or switching between separate tools.

PROJECTS AND EXAMPLES

Organize circuits into projects and start from included examples. Create and edit local projects without an account and continue working when an internet connection is unavailable.

BUILT FOR ENGINEERING ON THE GO

Tersa is designed for engineers, students, educators, makers, and electronics enthusiasts who want a practical circuit workspace beyond the desktop.

Use it for analog filters, digital logic, mixed-signal systems, amplifiers, diode circuits, RC transients, frequency-response studies, RF matching networks, and quick what-if experiments.

Simulation results should be independently verified before being used in safety-critical systems or production hardware.


## Version history (last 1 release)

### 1.0 — 2026-09-20

No release notes.

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## Related topics

[circuit design](https://appshunter.io/ios/topics/circuit-design)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-30.*