Rank history
Stamp Identifier Value by Ngoc Anh Pham Thi is currently performing at its all-time peak in the Education category on the App Store, matching its best-ever rank of #21, as recorded on 2026-06-16. Over the last 30 days, the app has maintained a remarkably stable trajectory, with both its best and average position sitting at #21. Its strongest current standing is in Liberia's Top Free chart at #21, followed by solid Top Free rankings in Burkina Faso (#27), Niger (#30), and Guinea-Bissau (#43). The app also shows a monetization foothold in Malta's Top Grossing chart at #52, while also ranking Top Free in Mozambique (#54) and Madagascar (#58). Overall, the app is steady at peak performance, holding its top position with no signs of decline.
Position heatmap
Current rankings
| Country | Chart | Rank | 7d | Δ |
|---|---|---|---|---|
| Guinea-Bissau | Top Free | #7 | 36 | |
| Liberia | Top Free | #21 | — | — |
| Burkina Faso | Top Free | #30 | 3 | |
| Chad | Top Free | #42 | 28 | |
| Malta | Top Grossing | #52 | — | — |
| Malta | Top Grossing | #52 | — | — |
| Mozambique | Top Free | #54 | — | — |
| Niger | Top Free | #56 | 26 | |
| Madagascar | Top Free | #58 | — | — |
| Guatemala | Top Grossing | #72 | 4 | |
| Zimbabwe | Top Free | #73 | — | — |
| Solomon Islands | Top Free | #84 | — | — |
| Rwanda | Top Free | #100 | — | — |