Voltage Divider vs 555 Calc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Voltage Divider
This engineering utility calculates unknown values in a voltage divider circuit. It can solve for voltages or resistor values, displaying ideal and actual resistor options. It also shows current, power, and voltage tolerance.
- Solves for Vin, Vout, R1, or R2
- Resistor picker with actual values
- Displays ideal resistor value
- Calculates voltage tolerance
- Shows current and power consumption
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A handy engineering utility that solves for voltages or resistor values in a common voltage divider circuit. Enter three terms (out of Vin, Vout, R1 or R2) and this app will solve for the fourth term automatically. The resistor picker will only let you pick from actual resistor values that exist. It's a great time saving tool for quickly selecting resistor values in a switching power supply design or any other circuit that incorporates a voltage divider. When solving for a voltage, select two resistor values and one of the voltages. The remaining voltage will be displayed automatically. The max and min possible voltages will also be displayed based on the resistor tolerances. The current and power through the divider will be displayed at the bottom of the screen. When solving for a resistor value, select two voltages and one resistor value. The remaining resistor value will be displayed in yellow. This is an ideal value. Use the resistor picker to select an actual resistor value close to that ideal value. You can then tell the app to solve for Vin or Vout to see if the resulting voltage meets your design requirements.
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.
Screenshots
Verdict
The clearest difference is price: 555 Calc at Free against Voltage Divider's $1.99. 555 Calc also leads on rating (4.0 vs 2.7) and update cadence (every 20 months vs every 48 months). Voltage Divider's advantage is ads (none vs shown). On review sentiment, ratings volume, 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; Voltage Divider costs $1.99 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 2.7. Both are backed by a comparable volume of ratings — 3 and 3 respectively. Written reviews complicate that: 56% of Voltage Divider's written reviews are positive against 50% of 555 Calc's, so the app with the better star average is not the one people write more warmly about.
Voltage Divider ships an update every 48 months, 555 Calc every 20 months. The most recent releases landed on June 23, 2026 and June 1, 2026 respectively.
| Parameter | Voltage Divider | 555 Calc |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 2.7 (3 ratings) | 4.0 (3 ratings) — better |
| Positive reviews | 55.6% of reviews — better | 50.0% of reviews |
| Number of ratings | 3 | 3 |
| Update frequency | Every 48 months | Every 20 months — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Paid | Ad-supported — better |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 12.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 18 MB |
| Age rating | 4+ | 4+ |
| Developer | Ditty Labs, LLC | Jibiki Works |
Customer experience
Voltage Divider
555 Calc
In-app purchases
Voltage Divider
No in-app purchases
555 Calc
No in-app purchases
