Comparison

Equation vs 555 Timer & Oscillators Pro

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

Head to head
About

Equation

Features
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The EquationSolver is carefully designed to be a simple and elegant app. Easy to use, easy to understand, simple and effective It solves system of linear equations, simultaneous linear equations (no limit on the number of equations). It also teaches you the steps to solve such systems. To find a solution, it uses Matrix inversion method or LU decomposition method when inverse is not possible or complicated. The equations are beautifully presented in both: 1) Set of individual equations form 2) Matrix-vector product form. You can also share the beautifully written solution It automatically saves your hard work locally on your device so you can come back and pick up from where you left off as your great effort will not be lost. This is a perfect app if you are a student learning to solve these kind of equations. There is also a Study page to help you with learning some important linear algebra formulas. This is an app for all student groups. From high school to college to university students. Be creative. Enjoy the app!

About

555 Timer & Oscillators Pro

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 Pro edition provides additional tools for faster learning and easy navigation: • Full-text search across all lessons and components • Favorites for saving and organizing important topics The content is regularly updated and expanded with each new release, ensuring the latest tutorials and circuit examples are always available.

Screenshots

Equation4 screens
555 Timer & Oscillators Pro4 screens

Verdict

The call

The clearest difference is update cadence: Equation at monthly against 555 Timer & Oscillators Pro's every 3 months. Equation also leads on price ($1.99 vs $4.99). On ads, in-app purchases, device support and iOS requirement 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

Equation costs $1.99 and 555 Timer & Oscillators Pro $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Equation ships an update monthly, 555 Timer & Oscillators Pro every 3 months. The most recent releases landed on August 16, 2026 and September 24, 2026 respectively.

Scorecard2 real differences · 4 level
Equation versus 555 Timer & Oscillators Pro: the parameters behind the verdict, then further details
ParameterEquation555 Timer & Oscillators Pro
Price$1.99 — better$4.99
Update frequencyMonthly — betterEvery 3 months
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS15.1 — better16.0
Further details — not scored
Size30 MB22 MB
Age rating4+4+
DeveloperOm Prakash ChapagainALG Software Lab

In-app purchases

None

Equation

No in-app purchases

None

555 Timer & Oscillators Pro

No in-app purchases

Questions

Is Equation free?
Equation costs $1.99, with no in-app purchases.
Is 555 Timer & Oscillators Pro free?
555 Timer & Oscillators Pro costs $4.99, with no in-app purchases.
Do Equation or 555 Timer & Oscillators Pro have ads?
Neither Equation nor 555 Timer & Oscillators Pro shows ads.
Which is updated more often, Equation or 555 Timer & Oscillators Pro?
Equation ships an update monthly, and 555 Timer & Oscillators Pro every 3 months. Most recently, Equation was updated on August 16, 2026 and 555 Timer & Oscillators Pro on September 24, 2026.

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