iMSO2 vs Smith Charts
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iMSO2
Analyze analog and digital signals on your mobile device using specialized hardware. Offers a demo mode for simulated wave display and measurements, with full functionality unlocked by purchasing the iMSO-204 mixed signal oscilloscope hardware.
- Analyze analog and digital signals
- Simulated wave display
- Cursors with measurements
- Direct signal measurements
- Analog and digital triggering
- Hardware integration
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Oscilloscope your phone, touch or tablet! iMSO2 allows you to analyze 2 analog and up to 4 digital signals using the iMSO-204 mixed signal oscilloscope hardware. Although demo mode is available for free with this download, hardware must be purchased to fully enable the product. - It's the first mixed signal oscilloscope available in the app store (50MSPS / 5MHz) - Easiest, most intuitive scope you’ll ever use - Preferred scope for the next generation of inventors Software demo mode includes: - Simulated wave display (sine, square, sawtooth, and triangular) - Cursors w/ measurements - Direct signal measurements - Analog triggering - Run / Stop / Single mode Hardware mode includes: - Analog triggering - Digital triggering - Cursors w/ measurements - Direct signal measurements - 1x or 10x probe setting - Run / STOP / Single mode Hardware works with the following devices: - iPad mini 3 - iPad mini 2 - iPad mini - iPad Air 2 - iPad Air - iPad 4 - iPad 3 - iPad 2 - iPad - iPhone 6 Plus - iPhone 6 - iPhone 5C - iPhone 5S - iPhone 5 - iPhone 4S - iPhone 4 - iPhone 3GS - iPod touch [3rd (32GB only), 4th and 5th generation)
Smith Charts
Design matching networks, analyze device parameters, and compute stability circles with this interactive tool. Supports S parameters, various components, and offers advanced engineering features for RF design. Available in dark mode and exportable to PDF.
- Interactive Smith chart with drag and zoom
- Design matching networks with various components
- Compute stability, equi gain, and noise circles
- Import S parameters from Touchstone files
- Export designs to PDF, image, or file
- Dark mode support
- Ruler for wavelength measurement
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A great experience of the Smith chart. Also in dark mode. Design matching networks, insert S parameters and convert them, or import from touchstone file. Compute stability circles, equi gain and noise circles. Easy interaction with the Smith chart. This chart can easily replace a physical one, making its use much faster. Smith chart interactivity: - Works on iPhone, iPad and Mac (on Apple Silicon). - Drag and zoom in the chart. - Create multiple Smith Charts and name them. - Switch easily between input and output planes. - Use a ruler and drag it to obtain the wavelength toward generator of a point on the chart, instantly. - Tap the chart to show the coordinates in algebraic notation, you will see also magnitude and phase of that location, and the corresponding impedance. - Insert circles by hand; modify the radius dragging a circle to keep the center in place, or press to translate them and modify the radius keeping the opposite side in place. Then use the padlock button to disable interaction of gestures with circles. - You can also insert a custom circle and a segment in the input and in the output plane, defining its center and radius in a textfield. - Export to file, image or PDF Advanced tools for engineering: Matching networks: - Choose electronic components to design a matching network for your device. - Available components are: L, C, R, Z and lines (transmission line, parallel or series stub, open or shorted). - For each component it is possible to specify the parasites. - For transmission lines, it is possible to choose between Z0, K or L, C representations, and converting between the two (also for parasites). - Tapping on a component it is added to the network and the impedance seen from your device toward the matching network is shown on the smith chart. - You can create a matching network both for input and output planes of the device. - Each network has its own termination (source or load), which can be a one port device or a two ports device where you can choose a termination for the second port. - Each termination can be defined by network parameters (S, Z, Y or h) and the parameters can be imported from a touchstone file. - Components supported: Resistor, Capacitor, Inductor, General impedance (R+jX), Transmission line, Parallel stub, series Stub (both shorted or open). - Each component can be cascaded in series or in parallel, no limits of components. - You can choose a frequency for the impedance calculation and a frequency span for the plot on the Smith Chart. - For S parameters, you can specify a dedicated characteristic impedance, the tool will renormalize the Γ of that termination to be correctly shown on the Smith chart, when the smith chart is defined on a different characteristic impedance. Device analysis: - You can insert the following parameters of a device: network parameters (S, Z, Y or h), specifications (Ga, Gp, Gt, NF), noise data (gamma s optimum noise, minimum NF, rn) and the input/output reflection coefficients. - You can convert network parameters (S, Z, Y, h), and the port type (Γ, Z, Y). - While you are inserting data, you will see the computed results appearing on the chart and on the relative fields. - Results representable on the smith chart: input/output stability circles, power gain and noise circles (equiGa, Gp, Gt, NF circles), reflection coefficients towards load and source and optimum power coefficients. - Other results: obtained power gains and noise (Ga, Gp, Gt, NF) and stability (D, K, kind of stability). - You can display on the Smith chart the input impedance of your component versus frequency (as a function of load impedance) when importing a touchstone file. - For S parameters, you can specify a different characteristic impedance and the tool will automatically convert it to the one defined for the Smith chart, it will let you know the new renormalized parameters.
Screenshots
Verdict
The clearest difference is price: iMSO2 at Free against Smith Charts's $3.99. iMSO2 also leads on rating (5.0 vs 3.7) and review sentiment (100% vs 67%). Smith Charts's advantage is update cadence (every 3 weeks vs every 2 months). On ratings volume, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
iMSO2 is free to download; Smith Charts costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.
iMSO2 holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 2 and 3 respectively. Written reviews point the same way: 100% of iMSO2's written reviews are positive against 67% of Smith Charts's.
iMSO2 ships an update every 2 months, Smith Charts every 3 weeks. The most recent releases landed on September 15, 2026 and September 21, 2026 respectively.
| Parameter | iMSO2 | Smith Charts |
|---|---|---|
| Price | Free — better | $3.99 |
| Rating | 5.0 (2 ratings) — better | 3.7 (3 ratings) |
| Positive reviews | 100.0% of reviews — better | 66.7% of reviews |
| Number of ratings | 2 | 3 — better |
| Update frequency | Every 2 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 11 MB | 24 MB |
| Age rating | 4+ | 4+ |
| Developer | Oscium LLC | Edoardo Orzes |
Customer experience
iMSO2
Smith Charts
In-app purchases
iMSO2
No in-app purchases
Smith Charts
No in-app purchases









