| What it does | All-in-one calculator app with 1,001 calculators offline, no ads, and no data collection
| Electronics calculators for makers
|
|---|
| Stage | Not given
| Not given
|
|---|
| Founded | Not given
| Not given
|
|---|
| Based in | Not given
| Not given
|
|---|
| Pricing model | Not given
| Freemium
|
|---|
| Pricing | Free: 250 calculators forever. Pro: 7-day free trial, then £0.99 first year (introductory price), £2.99 per year after. Trade Tools: £9.99 once (includes one year of Pro).
| Free: $0 forever. Pro Monthly: $4 per month, cancel anytime. Pro Lifetime: $29 one-time payment.
|
|---|
| Key features | - Works completely offline with no internet required
- No advertisements on any tier
- No data collection or tracking
- Construction tools for feet and inches calculations
- Trade tools for plumbing, electrical, HVAC and other trades
- Create itemised quotations and invoices on your letterhead
- Timesheet to take-home pay calculator with PDF export
- Monthly budget planner with spending analysis
- Compare mortgages and calculate overpayment savings
| - Resistor Color Code: read 4, 5 and 6-band resistors or find bands for a value
- LED Resistor: pick the current-limiting resistor and power rating
- Voltage Divider: output voltage, loading effect, or solve R2 for target Vout
- RC Filter: cutoff frequency, time constant and attenuation at any frequency
- LC Resonance: resonant frequency, characteristic impedance and Q
- 555 Timer: astable frequency/duty cycle and monostable pulse width
- Battery Life: runtime from capacity, active/sleep current and duty cycle
- PCB Trace Width: IPC-2221 trace width for current and temperature rise
- Electronics Unit Converter: SI prefixes, AWG to mm², mil to mm, dBm to mW, oz copper
|
|---|
| What makes it different | - 250 calculators free forever across all categories
- All calculations performed on device with no data transmission
- Ten trade tool sets in one purchase with stairs and roofs drawn to scale
- Complete job management from quoting to timesheets in one app
- No account, sign-in or permissions required
| - Real E-series resistor values, not ideal numbers
- Engineering notation input and result sharing as links
- No ads, no tracking, no sign-up for free calculators
- Whole-device BOM costing and battery-life summary in Pro
- Works on phone at the bench
|
|---|
| Community votes | 0 | 0 |
|---|
| DR (Domain Rating by Ahrefs) | Not checked yet ● no change since last check | 1 ▲ +1 (up) since last check |
|---|
| Trust Flow (Majestic) | 2 | 0 |
|---|
| Citation Flow (Majestic) | 2 | 0 |
|---|
| Referring domains (Majestic) | 21 | 0 |
|---|
1001 Pro Calculators and Tools
Ohmlark