Comparison

Opamp tools vs Circuit Simulator

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Opamp tools

Read 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

About

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.

Highlights
  • Real-time electronic circuit simulation
  • Digital circuit simulation
  • Voltage and current analysis
  • Multichannel oscilloscope
  • Multimeter tools
  • Circuit design and tuning
Features
Read 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

Opamp tools4 screens
Circuit Simulator4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard2 real differences · 8 level
Opamp tools versus Circuit Simulator: the parameters behind the verdict, then further details
ParameterOpamp toolsCircuit Simulator
PriceFreeFree
Rating—4.7 (92 ratings) — better
Positive reviews—76.9% of reviews
Number of ratings—92 — better
Update frequencyEvery 12 monthsEvery 6 weeks — better
AdsNoNo
In-app purchasesYesYes
Monetization—Free with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better15.3
Further details — not scored
Size4 MB103 MB
Age rating4+4+
DeveloperSiu Yuen HoSindhu Gopi

In-app purchases

1 purchases

Opamp tools

One-time1
  • Unlock pro feature$1.99
8 purchases

Circuit Simulator

Subscriptions1
  • Extensions Subscription$0.991 Month
One-time7
  • Sensors Extension$0.99
  • Custom Chips Extension$1.99
  • Instruments extension$2.99
Show 4 more
  • Analog Extension$3.99
  • Misc Extension$3.99
  • Digital Extension$3.99
  • Extension Pack$12.99

Questions

Is Opamp tools free?
Opamp tools is free to download, with in-app purchases available.
Is Circuit Simulator free?
Circuit Simulator is free to download, with in-app purchases available.
Do Opamp tools or Circuit Simulator have ads?
Neither Opamp tools nor Circuit Simulator shows ads.
Which is updated more often, Opamp tools or Circuit Simulator?
Opamp tools ships an update every 12 months, and Circuit Simulator every 6 weeks. Most recently, Opamp tools was updated on October 10, 2026 and Circuit Simulator on October 25, 2026.

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