Electronics docs & calculators vs Opamp tools
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Electronics docs & calculators
This app serves as a pocket electronics lab, offering a comprehensive reference for components and circuits. It simplifies complex calculations for filters, inductors, and various circuit configurations, aiding engineers and hobbyists in their designs.
- Electronic component reference
- Electronic circuit reference
- Filter calculation tools
- Inductor winding calculators
- Resistor and capacitor calculations
- Ohm's Law calculator
- AC/DC power calculations
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Electrohelper is carefully designed to address the need for electronic engineers and electronics hobbyists in designing an electronic circuit. The app contains the electronic components reference section, electronic circuit reference section, and electronic circuit calculation section. Tedious electronic circuit calculation such as Butterworth, Sallen-Key, Chebychev, and Bessel filter is made easier with the app. Electronic components section:- - Resistor - Capacitor - Inductor - Transient voltage suppressor(TVS) - Rectifier diode - Signal diode - Zener diode - Bipolar junction transistor(BJT) - Metal oxide field effect transistor(MOSFET) - 555 timer - Operational amplifier (Op-amp) - Arduino boards (arduino uno and arduino nano) - Atmega 328 - Voltage regulator integrated circuit(IC) - Multiplexers - Demultiplexers - Encoders -Decoders - Flip-flops - Counters - Shift registers Electronics calculator section:- - NE555 timer Astable multivibrator - NE555 timer monostable multivibrator - Bipolar junction transistor (BJT) analysos - Inductor winding - Toroidal inductor winding - Transformer winding - Butterworth, Bessel, Chebychev passive filter calculator - Sallen - Key active filter calculator - Inverting, noninverting and difference operational amplifier calculator - Resistor in series calculator - Resistor in parallel calculator - Capacitor in series calculator - Capacitor in parallel calculator - Capacitance of a capacitor calculator - Resistance calculator - Series LRC circuit impedance and reactance calculator - Parallel LRC circuit impedance and reactance - Charging and discharging a capacitor - Charging and discharging an inductor - Polyester film capacitor code - Ceramic capacitor code - Resistor color code - Air core inductor - Voltage divider - Current divider - Ohms law (current, voltage and resistance relation in a circuit) - Delta to star resistor network conversion - Star to delta resistor network conversion - Light emitting diode (LED) resistor calculator - Double pole Sallen - Key - Butterworth filter components value calculator - Surface mounted (SMD) resistor code calculator - Pi, Tee and Bridge attenuator - Radio frequency(RF) calculator - Alternating current (AC) power - Direct current(DC) power
Opamp tools
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This app is the collection of operational amplifier calculators. It is suitable for hobbyist or electronic engineer. Features * Inverting amplifier * Non-Inverting amplifier * Differential amplifier * Summing amplifier * Inverting comparator * First-order filter * Second-order filter (HPF) * Phase shift oscillator * Colpitts oscillator * Limit 5 combinations of component values * Share CSV via AirDrop * Upload CSV to iCloud Drive (For iOS8 or later) Pro Features * Instrumentation amplifier * Non-inverting comparator * Second-order filter (LPF) * Wien bridege oscillator * Hartley oscillator * No limitation of the number of suggestions * Selectable 1%,5%,10%,20% of values
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Verdict
The clearest difference is price: Opamp tools at Free against Electronics docs & calculators's $4.99. Electronics docs & calculators's advantage is in-app purchases (none vs 1). On update cadence, ads, 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
Opamp tools is free to download; Electronics docs & calculators costs $4.99 up front. Opamp tools sells 1 one-off in-app purchase. Electronics docs & calculators asks for nothing beyond the download.
Electronics docs & calculators ships an update every 6 months, Opamp tools every 12 months. The most recent releases landed on September 9, 2026 and May 16, 2026 respectively.
| Parameter | Electronics docs & calculators | Opamp tools |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 5.0 (5 ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 5 — better | — |
| Update frequency | Every 6 months — better | Every 12 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 49 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Anas Abubakar | Siu Yuen Ho |
In-app purchases
Electronics docs & calculators
No in-app purchases
Opamp tools
- Unlock pro feature$1.99
Questions
Is Electronics docs & calculators free?
Is Opamp tools free?
Do Electronics docs & calculators or Opamp tools have ads?
Which is updated more often, Electronics docs & calculators or Opamp tools?
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