555 Calc vs Capacitor Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
555 Calc
This utility app helps engineers and hobbyists calculate resistor values for circuits using the Timer IC 555. Simply input frequency, duty ratio, and capacitor values to get the required resistor outputs.
- Calculate resistor values
- Input frequency
- Input duty ratio
- Input capacitor value
- Timer IC 555 circuit design
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This App calculates registors value, when designing the circuit using Timer IC 555. How to (1) Input Frequency value. (2) Input Duty Ratio. (3) Input C1 Value. (4) Touch ‘Calculate’ button. (5) Registors value will be displayed. Note. * Set Duty Ratio to 50 ~ 99. * If you set Duty Ratio to 50, R1 value will be set to 0.
Capacitor Calculator
This utility app calculates the time constant and energy stored in a capacitor. It helps understand the time-delay characteristics of electrical circuits when a voltage is applied.
- Calculate time constant (RC)
- Calculate energy stored (E)
- Input voltage, capacitance, and resistance
- Understand capacitor charging/discharging
- Analyze circuit time-delay
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Capacitor Calculator is an all-in-one toolkit for students, hobbyists, technicians, and electrical engineers who work with capacitors every day. Whether you are designing an RC circuit, sizing a power supply, building a flash circuit, or studying electromagnetism for an exam, this app gives you fast and accurate answers together with the formulas and calculation steps behind every result. THREE CALCULATORS IN ONE APP 1. Capacitor Charge and Time Constant Enter supply voltage (V), capacitance (C), and series resistance (R) to instantly calculate: • Stored energy: E = 0.5 * C * V^2 • RC time constant: T = R * C • Charge stored: Q = C * V 2. Parallel Plate Capacitance Compute capacitance using plate area, separation distance, and relative permittivity with: C = e0 * er * A / d Perfect for understanding how geometry and dielectric materials affect capacitance. 3. Spherical Capacitor Calculate capacitance between two concentric conducting spheres using: C = 4 * pi * e0 * er * R1 * R2 / (R2 - R1) Choose from built-in dielectric materials including vacuum, air, paper, glass, mica, ceramic, polyethylene, polystyrene, Teflon, silicon, and water. BUILT FOR REAL WORK • Unit-aware inputs for voltage, capacitance, resistance, length, and area • Scientific notation for very small or very large values • Full calculation steps with formulas and substituted values • Copy results with one tap • Save and review calculation history • Everything runs on-device with no tracking, no account, and no internet required A POLISHED NATIVE IOS EXPERIENCE • Full Light Mode and Dark Mode support • Reference tab with physical constants, formulas, and dielectric materials table Capacitor Calculator is a focused tool for electrical engineering, electronics design, physics homework, and EE coursework. Download it once and keep professional-grade capacitor calculations in your pocket. Thanks for your support, and visit nitrio.com for more apps for your iPhone and iPad.
Screenshots
Verdict
The clearest difference is price: 555 Calc at Free against Capacitor Calculator's $2.99. 555 Calc also leads on rating (4.0 vs 3.8) and iOS requirement (11.0 vs 17.6). Capacitor Calculator's advantage is ads (none vs shown). On ratings volume, update cadence, 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
555 Calc is free to download; Capacitor Calculator costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
555 Calc holds the better App Store score, 4.0 against 3.8. Both are backed by a comparable volume of ratings — 3 and 4 respectively.
555 Calc ships an update every 20 months, Capacitor Calculator every 29 months. The most recent releases landed on October 13, 2026 and October 27, 2026 respectively.
| Parameter | 555 Calc | Capacitor Calculator |
|---|---|---|
| Price | Free — better | $2.99 |
| Rating | 4.0 (3 ratings) — better | 3.8 (4 ratings) |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 3 | 4 — better |
| Update frequency | Every 20 months — better | Every 29 months |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported — better | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 11.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 18 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Jibiki Works | Nitrio |
Customer experience
555 Calc
Capacitor Calculator
In-app purchases
555 Calc
No in-app purchases
Capacitor Calculator
No in-app purchases
Questions
Is 555 Calc free?
Is Capacitor Calculator free?
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