AppPriceData
Observed local App Store prices with one dated reference-currency comparison.
Across 2 observed Apple App Store storefronts, 单词树 - 每天进步一点，进度看得见 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 | CNChina mainland | 免费CNY | $0.00 | August 8, 2026 | Country price | App Store ↗ |
| #2 | USUnited States | FreeUSD | $0.00 | August 5, 2026 | Country price | App Store ↗ |