Comparison

OpAmplifiers vs 555 Timer & Oscillators Guide

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

Head to head
About

OpAmplifiers

This app aids electronics students by providing information on operational amplifier applications, including schematics, formulas, and component calculations. It offers a simple interface to revise key concepts and check amplifier pinouts.

Highlights
  • Operational amplifier application revision
  • Schematics and input value display
  • Formula lookup
  • Component value calculation
  • Amplifier pinout checking
  • Supports multiple op-amp circuit types
Features
Read full description

The ideal app for electronics studies ! OpAmplifiers allows you to easily revise what you should know about the main applications of Operational Amplifiers, but that's not it ! You can also use OpAmplifiers to calculate the values of your components and quickly check out the pinning of your amplifier, all in a simple and smooth interface. For each application, OpAmplifiers allows you to : - See schematics, and input values. - See the formula of the application. - Check the pinning of your amplifier. The following Operational Amplifier applications are available : - Voltage Follower - Comparator - Inverting Amplifier - Non Inverting Amplifier - Summing Amplifier - Differential Amplifier - Inverting Integrator - Inverting Differentiator

About

555 Timer & Oscillators Guide

Features
Read full description

Master the design of oscillators and waveform generators using 555 timer integrated circuits, digital logic integrated circuits, operational amplifiers, and transistors. The application provides a comprehensive collection of over 130 tutorials and circuit diagrams, covering 555 timer circuits and practical applications, CMOS 4000 series logic oscillators, TTL 74LS and 74HC series oscillators, operational amplifier–based waveform generators, and transistor multivibrators. Designed for electronics beginners, students, hobbyists, and professional engineers, the app serves as a complete reference and learning tool for designing, understanding, and building oscillators, multivibrators, pulse generators, and waveform circuits commonly used in both analog and digital electronics. In addition to tutorials and schematics, the app includes built-in calculators for frequency, timing, duty cycle, and component value estimation, helping users quickly calculate and adjust circuit parameters. All topics are presented with clear circuit diagrams and detailed explanations. Available in 14 Languages: • English, French, German, Indonesian, Italian, Japanese, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Turkish, Ukrainian, and Vietnamese — study in your native language! Covered Topics: • 555 Timer IC Series • Astable, monostable, and bistable modes • Pulse Width Modulation (PWM) • Voltage conversion circuits • Sensor and external module interfacing • CMOS Logic Oscillators • CMOS 4000 series circuits • Astable, monostable, and bistable modes • Gated CMOS oscillators • TTL / HC Logic Oscillators • TTL 74LS series circuits • 74HC series logic oscillators • Astable and monostable modes • Operational Amplifier Oscillators • Sine wave generators • Square-wave pulse generators • Triangle wave generators • Transistor-Based Oscillators • Transistor-Based Astable multivibrators • Transistor-Based Monostable multivibrators The content is regularly updated and expanded with each new release, ensuring the latest tutorials and circuit examples are always available.

Screenshots

OpAmplifiers4 screens
555 Timer & Oscillators Guide4 screens

Verdict

The call

The clearest difference is ads: OpAmplifiers at none against 555 Timer & Oscillators Guide's shown. OpAmplifiers also leads on update cadence (every 6 weeks vs every 5 months) and iOS requirement (6.0 vs 16.0). On price, 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

OpAmplifiers ships an update every 6 weeks, 555 Timer & Oscillators Guide every 5 months. The most recent releases landed on September 23, 2026 and October 2, 2026 respectively.

Scorecard3 real differences · 6 level
OpAmplifiers versus 555 Timer & Oscillators Guide: the parameters behind the verdict, then further details
ParameterOpAmplifiers555 Timer & Oscillators Guide
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 6 weeks — betterEvery 5 months
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPodiPhone, iPad
Requires iOS6.0 — better16.0
Further details — not scored
Size3 MB24 MB
Age rating4+4+
DeveloperKyrill CoussonALG Software Lab

In-app purchases

None

OpAmplifiers

No in-app purchases

None

555 Timer & Oscillators Guide

No in-app purchases

Questions

Is OpAmplifiers free?
OpAmplifiers is free to download, with no in-app purchases.
Is 555 Timer & Oscillators Guide free?
555 Timer & Oscillators Guide is free to download, with no in-app purchases.
Do OpAmplifiers or 555 Timer & Oscillators Guide have ads?
555 Timer & Oscillators Guide shows ads; OpAmplifiers does not.
Which is updated more often, OpAmplifiers or 555 Timer & Oscillators Guide?
OpAmplifiers ships an update every 6 weeks, and 555 Timer & Oscillators Guide every 5 months. Most recently, OpAmplifiers was updated on September 23, 2026 and 555 Timer & Oscillators Guide on October 2, 2026.

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