Comparison

Timer 555 Calculator vs Circuit Simulator Q

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

Head to head
About

Timer 555 Calculator

Calculate monostable and astable circuits for electronics projects. Determine pulse width and frequency, find component combinations, and save/upload data. Supports multiple languages.

Highlights
  • Monostable circuit pulse width calculation
  • Astable circuit frequency calculation
  • Component combination finder
  • Save component values to CSV
  • Upload CSV via AirDrop/iCloud Drive
  • Multi-language support
Features
Read full description

This app is used to calculate monostable and astable circuit. Features * Calculate pulse width of monostable circuit * Calculate frequency of astable circuit * Find out combination of components making a desire pulse width in monostable circuit * Find out combination of components making a desire frequency in astable circuit * Saving component values in CSV file * Upload generated CSV files via AirDrop or iCloud Drive * Support English, German, French, Italian, Spanish, Portuguese, Japanese, Korean, Russian

About

Circuit Simulator Q

Design and simulate complex digital logic circuits with an intuitive interface. Explore basic gates, build counters, ALUs, and even create your own processors. This tool brings your digital electronics ideas to life.

Highlights
  • Advanced circuit design
  • Qnet netlist algorithm
  • Build counter circuits and flip-flops
  • Construct Arithmetic Logic Units (ALUs)
  • Design custom processors
Features
Read full description

Welcome to Circuit Simulator Q! Unleash your creativity and dive into the world of digital circuit design! With Circuit Simulator Q, you can design and simulate logic circuits ranging from the simplest to the most complex designs. Our intuitive interface allows you to bring your ideas to life effortlessly. Key Features: Advanced Circuit Design: Create intricate logic circuits, from basic gates to complex architectures, all at your fingertips. Qnet Algorithm: Experience the power of our superior netlist algorithm, Qnet. Capable of handling the most complex circuits and branches, Qnet ensures seamless netlist generation while being resilient to loops. Build Countable Circuits: Design your own counter circuits and flip-flops, exploring the fundamentals of digital electronics. Arithmetic Logic Units: Construct arithmetic logic units (ALUs) that enable you to perform various calculations and operations. Create Your Own Processor: Push the boundaries of your imagination by designing your very own processors, integrating logic components like never before. Join a community of innovators and transform your ideas into reality with Circuit Simulator Q! Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Timer 555 Calculator4 screens
Circuit Simulator Q4 screens

Verdict

The call

The clearest difference is review sentiment: Timer 555 Calculator at 100% against Circuit Simulator Q's 0%. Timer 555 Calculator also leads on rating (3.9 vs 2.7). Circuit Simulator Q's advantage is update cadence (every 2 days vs every 3 months). On price, ratings volume, ads and in-app purchases 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. Timer 555 Calculator sells 1 one-off in-app purchase and Circuit Simulator Q sells 2 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Timer 555 Calculator holds the better App Store score, 3.9 against 2.7. Both are backed by a comparable volume of ratings — 8 and 3 respectively. Written reviews point the same way: 100% of Timer 555 Calculator's written reviews are positive against 0% of Circuit Simulator Q's.

UpkeepUpdate frequency

Timer 555 Calculator ships an update every 3 months, Circuit Simulator Q every 2 days. The most recent releases landed on September 24, 2026 and September 19, 2026 respectively.

Scorecard3 real differences · 7 level
Timer 555 Calculator versus Circuit Simulator Q: the parameters behind the verdict, then further details
ParameterTimer 555 CalculatorCircuit Simulator Q
PriceFreeFree
Rating3.9 (8 ratings) — better2.7 (3 ratings)
Positive reviews100.0% of reviews — better0.0% of reviews
Number of ratings8 — better3
Update frequencyEvery 3 monthsEvery 2 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.213.0 — better
Further details — not scored
Size3 MB190 MB
Age rating4+4+
DeveloperSiu Yuen HoAli Mert TUFEKCI

Customer experience

Timer 555 Calculator

All ratings8 ratings
Positive75.0%
Neutral0.0%
Negative25.0%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Circuit Simulator Q

All ratings3 ratings
Positive33.3%
Neutral0.0%
Negative66.7%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

1 purchases

Timer 555 Calculator

One-time1
  • Unlock Pro feature$0.99
2 purchases

Circuit Simulator Q

Subscriptions2
  • Weekly Plan$4.997 Days
  • Yearly Plan$29.991 Year

Questions

Is Timer 555 Calculator free?
Timer 555 Calculator is free to download, with in-app purchases available.
Is Circuit Simulator Q free?
Circuit Simulator Q is free to download, with in-app purchases available.
Which has better reviews, Timer 555 Calculator or Circuit Simulator Q?
Timer 555 Calculator is rated higher. Timer 555 Calculator averages 3.9 out of 5 from 8 ratings, while Circuit Simulator Q averages 2.7 from 3 ratings.
Do Timer 555 Calculator or Circuit Simulator Q have ads?
Neither Timer 555 Calculator nor Circuit Simulator Q shows ads.
Which is updated more often, Timer 555 Calculator or Circuit Simulator Q?
Timer 555 Calculator ships an update every 3 months, and Circuit Simulator Q every 2 days. Most recently, Timer 555 Calculator was updated on September 24, 2026 and Circuit Simulator Q on September 19, 2026.

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