Comparison

Thermistor Tool 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

Thermistor Tool

This application serves as a calculator for thermistors, supporting both Beta and Steinhart-Hart models. It facilitates conversions between temperature and resistance, and visualizes this relationship with a temperature-resistance graph. Ideal for hobbyists, students, and engineers.

Highlights
  • Beta model support
  • Steinhart-Hart model support
  • Temperature to resistance conversion
  • Resistance to temperature conversion
  • Temperature-resistance graph visualization
Read full description

This app is a calculator for thermistors. It is suitable for hobbyist, students or engineers. Features • support β model • support Steinhart–Hart model • conversion between temperature and resistance • show temperature-resistance graph All trade names mentioned in this app or the other documentation provided by this app are trademarks or registered trademarks of their respective holder. This app is not related or affiliated in any way these companies.

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

Thermistor Tool3 screens
555 Timer & Oscillators Pro4 screens

Verdict

The call

The clearest difference is price: Thermistor Tool at Free against 555 Timer & Oscillators Pro's $4.99. Thermistor Tool also leads on iOS requirement (13.0 vs 17.0). 555 Timer & Oscillators Pro's advantage is in-app purchases (none vs 1) and update cadence (every 2 months vs every 10 months). On ads 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

Thermistor Tool is free to download; 555 Timer & Oscillators Pro costs $4.99 up front. Thermistor Tool sells 1 one-off in-app purchase. 555 Timer & Oscillators Pro asks for nothing beyond the download.

UpkeepUpdate frequency

Thermistor Tool ships an update every 10 months, 555 Timer & Oscillators Pro every 2 months. The most recent releases landed on October 10, 2026 and October 19, 2026 respectively.

Scorecard4 real differences · 5 level
Thermistor Tool versus 555 Timer & Oscillators Pro: the parameters behind the verdict, then further details
ParameterThermistor Tool555 Timer & Oscillators Pro
PriceFree — better$4.99
Rating5.0 (3 ratings) — better—
Number of ratings3 — better—
Update frequencyEvery 10 monthsEvery 2 months — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS13.0 — better17.0
Further details — not scored
Size3 MB22 MB
Age rating4+4+
DeveloperSiu Yuen HoALG Software Lab

In-app purchases

1 purchases

Thermistor Tool

One-time1
  • Unlock Pro feature$1.99
None

555 Timer & Oscillators Pro

No in-app purchases

Questions

Is Thermistor Tool free?
Thermistor Tool is free to download, with in-app purchases available.
Is 555 Timer & Oscillators Pro free?
555 Timer & Oscillators Pro costs $4.99, with no in-app purchases.
Do Thermistor Tool or 555 Timer & Oscillators Pro have ads?
Neither Thermistor Tool nor 555 Timer & Oscillators Pro shows ads.
Which is updated more often, Thermistor Tool or 555 Timer & Oscillators Pro?
Thermistor Tool ships an update every 10 months, and 555 Timer & Oscillators Pro every 2 months. Most recently, Thermistor Tool was updated on October 10, 2026 and 555 Timer & Oscillators Pro on October 19, 2026.

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