Tersa: Circuit Simulator
Analog, Digital & RF Design
Free · Designed for iPad. Not verified for macOS.
Build, simulate and tune analog and RF circuits locally. Explore plots and Smith charts, with projects that remain available even when you are offline.
Tersa is a touch-first workspace for learning, reviewing, and tuning small analog and RF circuits on iPhone and iPad.
Build editable schematics, configure DC operating point, DC sweep, AC and transient analyses, and inspect measurements on clear plots. For linear two-port work, review S11, S12, S21 and S22, return and insertion loss, and raw complex data on a Smith chart.
Use local sample projects to explore RC and LC filters. Change supported component values with the tuner and run the analysis again without rebuilding the project. Import supported SPICE model cards and subcircuits when a circuit needs them.
Simulation runs locally on the device. Results depend on the circuit, models, and numerical settings and must be independently verified before fabrication or safety-related use.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
• Added reliable offline project access and synchronization after reconnecting.
• Fixed project renaming and migration of existing projects to an account without duplicates.
• Improved analysis setup, simulation execution, tuner updates and RF plot calculations.
• Double-tap a component to start a connection faster. Wire routing and junction editing are also improved.
• Added feedback from Settings with an optional reply email.
• Improved component and schematic properties, error messages, performance and touch interactions.
The developer, Denis Kosov, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Contact Info
- User Content
- Identifiers
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Denis Kosov
- Size
- 127.8 MB
- Category
- Developer Tools
- Compatibility
Requires iOS 13.0 or later.
- iPhone
Requires iOS 13.0 or later. - iPad
Requires iPadOS 13.0 or later. - iPod touch
Requires iOS 13.0 or later. - Mac
Requires macOS 11.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
English and 5 more
- English, German, Japanese, Korean, Russian, Simplified Chinese
- Age Rating
4+
- 4+
- Copyright
- © 2026 Denis Kosov