Opamp tools vs Circuit Simulator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Opamp tools
Read full descriptionHide full description
This app is the collection of operational amplifier calculators. It is suitable for hobbyist or electronic engineer. Features * Inverting amplifier * Non-Inverting amplifier * Differential amplifier * Summing amplifier * Inverting comparator * First-order filter * Second-order filter (HPF) * Phase shift oscillator * Colpitts oscillator * Limit 5 combinations of component values * Share CSV via AirDrop * Upload CSV to iCloud Drive (For iOS8 or later) Pro Features * Instrumentation amplifier * Non-inverting comparator * Second-order filter (LPF) * Wien bridege oscillator * Hartley oscillator * No limitation of the number of suggestions * Selectable 1%,5%,10%,20% of values
Circuit Simulator
Design and simulate electronic and digital circuits in real-time. Visualize voltage and current flow, and analyze circuit behavior with tools like oscilloscopes and multimeters. Offers a user-friendly experience for circuit design and digital electronic analysis.
- Real-time electronic circuit simulation
- Digital circuit simulation
- Voltage and current analysis
- Multichannel oscilloscope
- Multimeter tools
- Circuit design and tuning
Read full descriptionHide full description
VoltSim is a realtime electronic circuit simulator like Multisim, SPICE, LTspice, Altium or Proto for circuit design with a better user experience. VoltSim is a complete circuit app in which you can design circuits with various components and simulate an electric or digital circuit. During simulation you can check voltage, current and many other variables. Check signals on multichannel oscilloscope or multimeter and tune your circuit in real time! You can also use VoltSim as logic circuit simulator and perform digital electronic analysis! This app will help you visualize how the voltage varies across the circuit and how current flows through it. T&C: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is update cadence: Circuit Simulator at every 6 weeks against Opamp tools's every 12 months. Opamp tools's advantage is iOS requirement (12.0 vs 15.3). On price, 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
Both are free to download. Opamp tools sells 1 one-off in-app purchase and Circuit Simulator sells 8 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.
Opamp tools ships an update every 12 months, Circuit Simulator every 6 weeks. The most recent releases landed on October 10, 2026 and October 25, 2026 respectively.
| Parameter | Opamp tools | Circuit Simulator |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.7 (92 ratings) — better |
| Positive reviews | — | 76.9% of reviews |
| Number of ratings | — | 92 — better |
| Update frequency | Every 12 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 15.3 |
| Further details — not scored | ||
| Size | 4 MB | 103 MB |
| Age rating | 4+ | 4+ |
| Developer | Siu Yuen Ho | Sindhu Gopi |
In-app purchases
Opamp tools
- Unlock pro feature$1.99
Circuit Simulator
- Extensions Subscription$0.991 Month
- Sensors Extension$0.99
- Custom Chips Extension$1.99
- Instruments extension$2.99
Show 4 moreShow fewer
- Analog Extension$3.99
- Misc Extension$3.99
- Digital Extension$3.99
- Extension Pack$12.99
Questions
Is Opamp tools free?
Is Circuit Simulator free?
Do Opamp tools or Circuit Simulator have ads?
Which is updated more often, Opamp tools or Circuit Simulator?
Other comparisons















