Comparison

Paradoxes 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

Paradoxes

Explore a vast collection of over 220 logical oddities with detailed explanations. This app serves as a reference for philosophy students and anyone seeking engaging conversational topics, offering content in flashcard, dictionary, audio, and self-study formats.

Highlights
  • Over 220 paradoxes with explanations
  • Flashcard format
  • Dictionary format
  • Audio explanations
  • Self-study mode
  • Categorized paradoxes
Features
Currently charting
Read full description

Paradoxes is your go to reference app to learn a stack of logical oddities. We've got over 220 paradoxes with a full explanation. Whether you are a philosophy student or just looking for some conversational party tricks this app will do you some good. We present the content in flash cards, dictionary, audio and self study formats. For the serious paradoxer this app also features flashcards and paradoxes by category. Don't fall into the Decision-making paradox, buy this app and get educated.

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

Paradoxes4 screens
555 Timer & Oscillators Pro4 screens

Verdict

The call

The clearest difference is update cadence: 555 Timer & Oscillators Pro at every 2 months against Paradoxes's every 90 months. Paradoxes's advantage is price ($0.99 vs $4.99) and chart position (#191 vs unranked). On 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

Paradoxes costs $0.99 and 555 Timer & Oscillators Pro $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Paradoxes ships an update every 90 months, 555 Timer & Oscillators Pro every 2 months. The most recent releases landed on October 23, 2026 and October 25, 2026 respectively.

Scorecard4 real differences · 7 level
Paradoxes versus 555 Timer & Oscillators Pro: the parameters behind the verdict, then further details
ParameterParadoxes555 Timer & Oscillators Pro
Price$0.99 — better$4.99
Rating4.0 (1 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 90 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
Best chart rank#191 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS12.0 — better17.0
Further details — not scored
Size28 MB22 MB
Age rating9+4+
DeveloperPolemics Applications LLCALG Software Lab

In-app purchases

None

Paradoxes

No in-app purchases

None

555 Timer & Oscillators Pro

No in-app purchases

Questions

Is Paradoxes free?
Paradoxes costs $0.99, with no in-app purchases.
Is 555 Timer & Oscillators Pro free?
555 Timer & Oscillators Pro costs $4.99, with no in-app purchases.
Do Paradoxes or 555 Timer & Oscillators Pro have ads?
Neither Paradoxes nor 555 Timer & Oscillators Pro shows ads.
Which is updated more often, Paradoxes or 555 Timer & Oscillators Pro?
Paradoxes ships an update every 90 months, and 555 Timer & Oscillators Pro every 2 months. Most recently, Paradoxes was updated on October 23, 2026 and 555 Timer & Oscillators Pro on October 25, 2026.

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