Éist research · 2026-09-15-v1
Piper performance in Éist
Piper VITS through sherpa-onnx 1.12.40, cache version 5. These are observational results from Éist installations with analytics enabled, not a general benchmark of every Piper implementation.
Platform summary
Piper on android
0.247 RTF
p10–p90: 0.115–0.782
297 installations · 11,193 active health samples
Éist 1.3.21 · piper-v5-sherpa-1.12.40
Piper on ios
0.115 RTF
p10–p90: 0.088–0.23
293 installations · 16,620 active health samples
Éist 1.3.19 · piper-v5-sherpa-1.12.40
Qualifying device cohorts
Only cohorts with at least 100 active health samples and 10 installations appear. Lower RTF is faster.
| Engine | Device | Observed OS | Median RTF | p10–p90 | Installations | Health samples |
|---|---|---|---|---|---|---|
| Piper | iPhone18,2 | iOS 26.6–27.0 | 0.09 | 0.088–0.103 | 11 | 193 |
| Piper | iPhone18,1 | iOS 26.3–26.6.1 | 0.098 | 0.089–0.192 | 10 | 360 |
| Piper | iPhone17,2 | iOS 26.5.2–26.6.2 | 0.101 | 0.095–0.21 | 11 | 234 |
| Piper | iPhone18,3 | iOS 26.6–27.0 | 0.101 | 0.086–0.162 | 14 | 969 |
| Piper | iPhone15,2 | iOS 18.5–26.6.2 | 0.102 | 0.093–0.317 | 15 | 222 |
| Piper | iPhone17,1 | iOS 18.6.2–27.0 | 0.103 | 0.085–0.175 | 17 | 512 |
| Piper | iPhone16,1 | iOS 18.7.8–26.6.1 | 0.106 | 0.088–0.174 | 15 | 373 |
| Piper | iPhone16,2 | iOS 26.5–27.0 | 0.11 | 0.093–0.129 | 11 | 168 |
| Piper | iPhone17,3 | iOS 26.3–27.0 | 0.115 | 0.095–0.186 | 27 | 2,399 |
| Piper | iPhone15,4 | iOS 26.3.1–27.0 | 0.122 | 0.097–0.214 | 14 | 1,428 |
| Piper | iPhone15,3 | iOS 26.6–27.0 | 0.123 | 0.092–0.238 | 12 | 138 |
| Piper | iPhone14,7 | iOS 18.7.2–27.0 | 0.133 | 0.1–0.249 | 13 | 2,468 |
| Piper | iPhone14,5 | iOS 18.5–26.6.2 | 0.153 | 0.113–0.274 | 21 | 399 |
| Piper | iPhone12,1 | iOS 18.2–26.6.2 | 0.196 | 0.166–0.797 | 16 | 260 |