# ayutaz/piper-plus — health index 95/100 (Exceptional)

> Inspection of the public repository ayutaz/piper-plus by inspect.software. It holds a health index of 95 out of 100, placing it in the Exceptional band. The index is a signal derived from publicly visible practice, not a warranty, a security audit, or an endorsement, and it is independent of payment.

- Repository: https://github.com/ayutaz/piper-plus
- Report page: https://inspect.software/software/ayutaz/piper-plus
- Full JSON report: https://inspect.software/api/repositories/ayutaz/piper-plus/report
- Badge: https://raw.githubusercontent.com/inspect-software/badges/main/v1/a/ayutaz/piper-plus.svg
- Inspected: 2026-09-30
- Methodology: metrics 2.10.0, report schema 0.34.0 (https://inspect.software/methodology.md)

## Category summary

| Category | Weight | Index | Band |
|---|---|---|---|
| Vitality | 21% | 89/100 | Excellent |
| Community & Adoption | 17% | 68/100 | Good |
| Sustainability & Governance | 23% | 65/100 | Good |
| Engineering Quality | 19% | 96/100 | Exceptional |
| Security | 16% | 96/100 | Exceptional |
| AI Readiness | 4% | 88/100 | Excellent |

The weighted overall 82 is calibrated to 95 on the published index scale (record calibration 2026-08-02).

## Repository facts

| Field | Value |
|---|---|
| Description | Multilingual neural TTS (6 languages: JA/EN/ZH/ES/FR/PT, code supports SV) — C++, C#, Rust, Go, Python, npm (WASM). VITS + Prosody, streaming, CUDA/CoreML/DirectML. pip install piper-plus \| npm install piper-plus \| cargo install piper-plus-cli |
| Classification | cli, library, mobile |
| Homepage | https://ayutaz.github.io/piper-plus/ |
| Primary language | Python |
| License | MIT |
| Stars | 217 |
| Forks | 28 |
| Created | 2025-03-22 |
| Last push | 2026-09-30 |
| Latest release | npm-v0.7.0 |
| Commits (last year) | 398 |
| Bus factor | 1 |
| Topics | deep-learning, japanese, multilingual, onnx, pytorch, speech-synthesis, text-to-speech, tts, vits, webassembly, cross-platform, csharp, cuda, dotnet, nuget, rust, streaming |

## Published packages

| Registry | Package | Latest | Monthly downloads |
|---|---|---|---|
| go | github.com/ayutaz/piper-plus/src/go | v0.2.0 | — |
| pypi | piper-plus | 1.13.0 | 2,498 |
| pypi | piper-tts-plus | 1.12.0 | 1,120 |
| pypi | piper-phonemize | 1.1.0 | 24,764 |

## Vitality — 89/100 (Excellent)

Is the project alive — is code being written and are releases shipping? Weight: 21% of the overall index.

### Development activity — 82/100 (Excellent)

| Criterion | Status | Points | Detail |
|---|---|---|---|
| Push recency | met | 36 / 36 | last push 0 days ago |
| Commit cadence | partial | 19.4 / 36 | 28/52 weeks with commits |
| Commit volume | met | 18 / 18 | 398 commits in the last year |
| OpenSSF Scorecard: Maintained | excluded | 0 / 10 | OpenSSF Scorecard unavailable |

### Release discipline — 100/100 (Exceptional)

| Criterion | Status | Points | Detail |
|---|---|---|---|
| Ships releases | met | 27 / 27 | 19 releases published |
| Release recency | met | 36 / 36 | latest release 33 days ago |
| Release cadence | met | 27 / 27 | a release every ~17.6 days |
| OpenSSF Scorecard: Signed-Releases | excluded | 0 / 10 | OpenSSF Scorecard unavailable |

### Abandonment — 100/100 (Exceptional)

| Criterion | Status | Points | Detail |
|---|---|---|---|
| Project is still maintained | met | 100 / 100 | last human commit 0 days ago |

## Community & Adoption — 68/100 (Good)

Does the project have users, downloads, attention, and a welcoming setup for contributors? Weight: 17% of the overall index.

### Popularity & adoption — 52/100 (Moderate)

| Criterion | Status | Points | Detail |
|---|---|---|---|
| Stars | partial | 37.9 / 60 | 217 stars |
| Forks | partial | 11.9 / 25 | 28 forks |
| Watchers | partial | 2.7 / 15 | 4 watchers |

### Community health — 92/100 (Excellent)

| Criterion | Status | Points | Detail |
|---|---|---|---|
| README | met | 22.5 / 22.5 | — |
| License | met | 22.5 / 22.5 | recognized license (MIT) |
| CONTRIBUTING guide | met | 18 / 18 | — |
| Code of conduct | met | 13.5 / 13.5 | — |
| Issue template | not met | 0 / 7.2 | — |
| PR template | met | 6.3 / 6.3 | — |

### Ecosystem adoption (downloads) — 59/100 (Moderate)

Excluded from scoring (no data or not applicable): Registry dependents. Remaining weights renormalized.

| Criterion | Status | Points | Detail |
|---|---|---|---|
| Monthly downloads | partial | 47.4 / 80 | 3,618 downloads/month across go, pypi |
| Registry dependents | excluded | 0 / 20 | not reported by this ecosystem |

## Sustainability & Governance — 65/100 (Good)

Will the project survive its people — bus factor, responsiveness, who backs it, and package upkeep? Weight: 23% of the overall index.

### Maintainer resilience (bus factor) — 33/100 (At Risk)

| Criterion | Status | Points | Detail |
|---|---|---|---|
| Bus factor | partial | 9 / 54 | 1 contributor(s) cover half of all commits |
| Commit distribution | partial | 6.8 / 22.5 | top contributor authored 70% of commits |
| Contributor breadth | met | 13.5 / 13.5 | 21 contributors |
| OpenSSF Scorecard: Contributors | excluded | 0 / 10 | OpenSSF Scorecard unavailable |

### Issue & PR responsiveness — 78/100 (Good)

| Criterion | Status | Points | Detail |
|---|---|---|---|
| Issue resolution | partial | 40.1 / 42 | 95% of issues closed |
| PR acceptance | partial | 26.1 / 30 | 517/595 decided PRs merged |
| Newcomer PR acceptance | not met | 0 / 13 | 0/1 first-time contributors' PRs merged in 30d |
| OpenSSF Scorecard: Code-Review | excluded | 0 / 15 | OpenSSF Scorecard unavailable |

### Ownership & stewardship — 61/100 (Moderate)

Excluded from scoring (no data or not applicable): Verified domain. Remaining weights renormalized.

| Criterion | Status | Points | Detail |
|---|---|---|---|
| Ownership backing | partial | 10 / 30 | personal (user) account |
| Verified domain | excluded | 0 / 20 | not applicable to user accounts |
| Owner reach | partial | 13.6 / 25 | 76 followers of ayutaz |
| Track record | met | 25 / 25 | 429 public repos, account ~8 yr old |

### Package maintenance — 100/100 (Exceptional)

| Criterion | Status | Points | Detail |
|---|---|---|---|
| Published & resolvable | met | 25 / 25 | 3 package(s) on go, pypi |
| Publish recency | met | 35 / 35 | latest publish 108 days ago |
| Version history | met | 20 / 20 | 17 published versions |
| Not deprecated | met | 20 / 20 | active, not deprecated or yanked |

## Engineering Quality — 96/100 (Exceptional)

Are baseline engineering and documentation practices in place? Weight: 19% of the overall index.

### Engineering practices — 100/100 (Exceptional)

| Criterion | Status | Points | Detail |
|---|---|---|---|
| CI workflows | met | 24 / 24 | 117 workflow(s) |
| Tests present | met | 24 / 24 | — |
| Linter config | met | 16 / 16 | .golangci.yml, clippy.toml, eslint.config.js, pyproject.toml ([tool.ruff]), rustfmt.toml, src/python_run/setup.cfg ([flake8], [isort]), src/rust/Cargo.toml ([workspace.lints]) |
| Pre-commit hooks | met | 9.6 / 9.6 | — |
| .editorconfig | met | 6.4 / 6.4 | — |
| OpenSSF Scorecard: CI-Tests | excluded | 0 / 20 | OpenSSF Scorecard unavailable |

### Documentation — 90/100 (Excellent)

| Criterion | Status | Points | Detail |
|---|---|---|---|
| README | met | 30 / 30 | — |
| Documentation directory | met | 25 / 25 | — |
| Documentation / homepage site | met | 15 / 15 | https://ayutaz.github.io/piper-plus/ |
| Repository description | met | 10 / 10 | — |
| Topics | met | 10 / 10 | 17 topics |
| Wiki | not met | 0 / 10 | — |

## Security — 96/100 (Exceptional)

Are visible security and supply-chain practices strong, with no malicious dependency and no unresolved high-risk jurisdiction exposure? Weight: 16% of the overall index.

### Security posture — 100/100 (Exceptional)

| Criterion | Status | Points | Detail |
|---|---|---|---|
| Security policy (SECURITY.md) | met | 30 / 30 | — |
| Dependabot config | met | 25 / 25 | — |
| Dependency lockfiles | met | 25 / 25 | Cargo.lock, go.sum, package-lock.json, packages.lock.json, uv.lock |
| CodeQL workflow | met | 20 / 20 | — |

### Dependency advisories — 80/100 (Excellent)

Matched the pypi:piper-plus@1.13.0 runtime dependency closure — what installing the published package pulls in — 26 packages. Reachability is not analyzed.

| Criterion | Status | Points | Detail |
|---|---|---|---|
| Direct dependencies free of known advisories | partial | 15.4 / 35 | 1 affected: nltk 3.10.3 (high 7.0) |
| Indirect dependencies free of known advisories | met | 25 / 25 | no indirect dependency carries a known advisory |
| No advisories left outstanding | met | 40 / 40 | no advisory has been public longer than 90 days |

### Malicious dependencies — 100/100 (Exceptional)

| Criterion | Status | Points | Detail |
|---|---|---|---|
| No dependency reported as a malicious package | met | 100 / 100 | no dependency is reported as a malicious package |

### High-Risk Jurisdiction Exposure — 100/100 (Exceptional)

Only high-confidence self-published location evidence affects this multiplier. Ambiguous matches are review-only; country evidence is not proof of nationality, citizenship, legal registration, malicious intent, or sanctions status.

| Criterion | Status | Points | Detail |
|---|---|---|---|
| Policy exposure multiplier | met | 100 / 100 | no confirmed policy-scope location match |

## AI Readiness — 88/100 (Excellent)

How well is the repo equipped to be developed and maintained with AI coding agents? Carries a deliberately small weight: agent tooling is a real maintenance signal, but its absence must never gate the top of the scale (calibration saturates at raw 91, so 100/100 remains reachable with AI Readiness at zero).

### Agent context & guidance — 85/100 (Excellent)

| Criterion | Status | Points | Detail |
|---|---|---|---|
| Agent instructions | met | 45 / 45 | CLAUDE.md |
| Machine-readable docs (llms.txt) | not met | 0 / 15 | — |
| Legible commit history | met | 40 / 40 | 82 of 82 human commits state their intent (structured subject or explanatory body) |

### Verify loop (build / test / typecheck) — 89/100 (Excellent)

| Criterion | Status | Points | Detail |
|---|---|---|---|
| One-command bootstrap | met | 18 / 18 | Makefile, examples/c-api/Makefile, src/go/Makefile, src/python/piper_train/vits/monotonic_align/Makefile |
| Automated tests | met | 22 / 22 | — |
| Lint / format config | met | 11 / 11 | .golangci.yml, clippy.toml, eslint.config.js, pyproject.toml ([tool.ruff]), rustfmt.toml, src/python_run/setup.cfg ([flake8], [isort]), src/rust/Cargo.toml ([workspace.lints]) |
| Static type checking | met | 11 / 11 | src/python/g2p/piper_plus_g2p/py.typed, src/python/mypy.ini, src/python/piper_train/py.typed, src/python_run/mypy.ini, src/python_run/piper_plus/api/py.typed, src/python_run/py.typed, src/wasm/g2p/tsconfig.json, src/wasm/openjtalk-web/tsconfig.json |
| Reproducible environment | met | 10 / 10 | Dockerfile, lockfile |
| Demonstrated agent practice | not met | 0 / 10 | no agent-authored commits among the last 100 |
| Automated maintenance | met | 8 / 8 | 18 of the last 100 commits are automated dependency updates |
| OpenSSF Scorecard: Pinned-Dependencies | excluded | 0 / 10 | OpenSSF Scorecard unavailable |

### Code legibility for models — 81/100 (Excellent)

| Criterion | Status | Points | Detail |
|---|---|---|---|
| Type-checkable code | partial | 27 / 45 | Python with type-check config (src/python/g2p/piper_plus_g2p/py.typed, src/python/mypy.ini, src/python/piper_train/py.typed, src/python_run/mypy.ini, src/python_run/piper_plus/api/py.typed, src/python_run/py.typed, src/wasm/g2p/tsconfig.json, src/wasm/openjtalk-web/tsconfig.json) |
| Manageable file sizes | partial | 54.4 / 55 | 12/1128 source files over 60KB |

### Machine-readable interfaces — 100/100 (Exceptional)

Excluded from scoring (no data or not applicable): API schema (OpenAPI/GraphQL/proto), MCP server. Remaining weights renormalized.

| Criterion | Status | Points | Detail |
|---|---|---|---|
| API schema (OpenAPI/GraphQL/proto) | excluded | 0 / 40 | not applicable to this kind of software |
| MCP server | excluded | 0 / 20 | not applicable to this kind of software |
| Runnable examples | met | 40 / 40 | example, examples, notebooks, sample |

## Collection warnings

- Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token
- Could not fetch pypi package 'piper-plus-workspace' from its registry
- Could not fetch pypi package 'piper-train' from its registry
- Could not fetch crates package 'ja-dict-blob' from its registry
- pypi package 'piper-phonemize' points at a different repository (https://github.com/rhasspy/piper-phonemize); excluded from ecosystem scoring
- OpenSSF Scorecard did not return a usable result (killed by SIGKILL — most likely the container's memory limit); skipping Scorecard checks

## What this report is

inspect.software measures public repositories against a single published, versioned methodology and reports the result as a 1–100 health index. Findings are signals derived from what is visible in public repository data — they are not a security audit, a warranty, or an endorsement, and no result depends on payment.

- Methodology, formulas and weights: https://inspect.software/methodology.md
- What a result does and does not claim: https://inspect.software/wiki/signals-not-warranties.md
- Rating bands: https://inspect.software/wiki/scoring-bands.md
- Corrections: https://inspect.software/contact.md
- Index of all documents: https://inspect.software/llms.txt