| What it does | Electronics calculators for makers
| Free Pokémon card grade checker
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| Stage | Not given
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| Founded | Not given
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| Based in | Not given
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| Pricing model | Freemium
| Freemium
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| Pricing | Free: $0 forever. Pro Monthly: $4 per month, cancel anytime. Pro Lifetime: $29 one-time payment.
| Free: 7 full scans per month, live scan, grade estimate, values, decision, calculators and collection unlimited. Pro monthly: $3.99/month (rises to $4.99 for new subscribers January 1, 2027), unlimited scans. Pro yearly: $31.99/year, $2.67 per month, save 33% (rises to $39.99 for new subscribers Jan
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| Key features | - 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
| - PSA grade estimation with centering, corners, edges and surface subgrades measured from photos
- Card identification using CardSight AI matched to exact TCGplayer printing
- Raw prices from TCGplayer refreshed daily for each printing variant
- Graded values from median of recent eBay completed sales for PSA, CGC and Beckett
- Collection tracker with daily valuation and price history charts synced across devices
- Grade-or-not verdict calculated after subtracting grading fees, shipping and eBay fees
- Price guide searchable by card name or number with separate prices for Shadowless, 1st Edition and other printings
- Grade range showing likely grade plus how far it could swing based on photo limitations
- Free account with email sign-up, no password required, optional collection sync across devices
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| What makes it different | - 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
| - No download required, runs directly in web browser on phone and computer
- Built by an actual collector and reseller with dated real-world sales data
- Independent and unaffiliated with PSA, graders, retailers or Pokémon Company
- Live camera scanning with auto-straightening works at any angle, including full tilted surface check
- Compares estimated grade and grading cost against raw and graded comps to show actual profit potential
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 1 ▲ +1 (up) since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 0 | 0 |
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| Citation Flow (Majestic) | 0 | 15 |
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| Referring domains (Majestic) | 0 | 2 |
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Ohmlark
Should I Grade It?