AppPriceData
Observed local App Store prices with one dated reference-currency comparison.
Across 5 observed Apple App Store storefronts, Operational Amplifiers Guide is free to download in every stored observation. Each country row keeps its own storefront and observation date.
Local storefront prices remain the source records. USD values are informational reference conversions from one dated exchange-rate snapshot and can differ from taxes, card settlement, or final checkout pricing.
Rows are sorted by the USD reference conversion when a supported exchange rate is available. The local price and currency remain the original source values.
| Rank | Storefront | Local price | USD reference | Observed | Details | Official store |
|---|---|---|---|---|---|---|
| #1 | CN |
| 免费CNY |
| $0.00 |
| August 8, 2026 |
| Country price |
| App Store ↗ |
| #2 | DEGermany | GratisEUR | $0.00 | August 8, 2026 | Country price | App Store ↗ |
| #3 | JPJapan | 無料JPY | $0.00 | August 8, 2026 | Country price | App Store ↗ |
| #4 | KRSouth Korea | 무료KRW | $0.00 | August 8, 2026 | Country price | App Store ↗ |
| #5 | USUnited States | FreeUSD | $0.00 | August 5, 2026 | Country price | App Store ↗ |