# Coqui TTS vs eSpeak NG

| Attribute | Coqui TTS | eSpeak NG |
|---|---|---|
| **Vioscale score** | 35.6 (20% (low)) | 49.5 (26% (low)) |
| activity.commits_last_30d | 0 | 36 |
| adoption.dependent_repos | 0 | - |
| adoption.github_stars | 2,312 | 6,762 |
| deployment.options | `{"cloud":true,"self_hosted":true}` | `{"self_hosted":true}` |
| description.long | A neural network-based framework for converting text to natural-sounding speech, supporting multiple languages and speakers. It provides both command-line and Python APIs for building, training, and deploying text-to-speech models. | A lightweight open source text-to-speech engine that converts written text into spoken audio using formant synthesis. Available as a command-line tool and C/library for integration across Linux, Windows, Android, and other platforms. |
| integrations.count | - | 3 |
| integrations.list | - | `[{"name":"MBROLA"},{"name":"SAPI5"},{"name":"C API library integration"}]` |
| language.primary | Python | C |
| license.spdx | MPL-2.0 | GPL-3.0 |
| platform.support | `{"cli":true,"mac":true,"linux":true,"windows":true}` | `{"cli":true,"mac":true,"linux":true,"android":true,"windows":true}` |
| pricing | `{"type":"open_source","freeTier":true,"sourceUrl":"https://github.com/pricing","retrievedAt":"2026-08-19T22:01:12.842Z"}` | `{"type":"open_source","summary":"Free and open source","freeTier":true,"sourceUrl":"https://github.com/pricing","retrievedAt":"2026-08-19T22:01:16.060Z"}` |
| pricing.free_tier | yes | yes |
| pricing.model | commercial | commercial |
| pricing.price_level | free | free |
| pricing.transparent | - | yes |
| release.cadence_days | 32 | 799 |
| release.history | `[{"url":"https://github.com/idiap/coqui-ai-TTS/releases/tag/v0.27.5","date":"2026-01-26T16:37:46Z","type":"stable","version":"v0.27.5"},{"url":"https://github.com/idiap/coqui-ai-TTS/releases/tag/v0.27.4","date":"2026-01-23T15:49:54Z","type":"stable","version":"v0.27.4"},{"url":"https://github.com/idiap/coqui-ai-TTS/releases/tag/v0.27.3","date":"2025-12-13T13:13:52Z","type":"stable","version":"v0.27.3"},{"url":"https://github.com/idiap/coqui-ai-TTS/releases/tag/v0.27.2","date":"2025-09-25T14:12:37Z","type":"stable","version":"v0.27.2"},{"url":"https://github.com/idiap/coqui-ai-TTS/releases/tag/v0.27.1","date":"2025-09-05T22:53:24Z","type":"stable","version":"v0.27.1"},{"url":"https://github.com/idiap/coqui-ai-TTS/releases/tag/v0.27.0","date":"2025-07-14T13:57:00Z","type":"stable","version":"v0.27.0"},{"url":"https://github.com/idiap/coqui-ai-TTS/releases/tag/v0.26.2","date":"2025-05-22T12:11:54Z","type":"stable","version":"v0.26.2"},{"url":"https://github.com/idiap/coqui-ai-TTS/releases/tag/v0.26.1","date":"2025-05-16T14:10:13Z","type":"stable","version":"v0.26.1"},{"url":"https://github.com/idiap/coqui-ai-TTS/releases/tag/v0.26.0","date":"2025-03-10T16:25:17Z","type":"stable","version":"v0.26.0"},{"url":"https://github.com/idiap/coqui-ai-TTS/releases/tag/v0.25.3","date":"2025-01-16T10:59:53Z","type":"stable","version":"v0.25.3"},{"url":"https://github.com/idiap/coqui-ai-TTS/releases/tag/v0.25.2","date":"2025-01-15T16:46:54Z","type":"stable","version":"v0.25.2"},{"url":"https://github.com/idiap/coqui-ai-TTS/releases/tag/v0.25.2_models","date":"2024-12-11T15:35:44Z","type":"prerelease","version":"v0.25.2_models"},{"url":"https://github.com/idiap/coqui-ai-TTS/releases/tag/v0.25.1","date":"2024-12-09T16:57:35Z","type":"stable","version":"v0.25.1"},{"url":"https://github.com/idiap/coqui-ai-TTS/releases/tag/v0.25.0","date":"2024-12-04T10:28:05Z","type":"stable","version":"v0.25.0"},{"url":"https://github.com/idiap/coqui-ai-TTS/releases/tag/v0.24.3","date":"2024-11-06T00:59:53Z","type":"stable","version":"v0.24.3"},{"url":"https://github.com/idiap/coqui-ai-TTS/releases/tag/v0.24.2","date":"2024-10-04T12:12:20Z","type":"stable","version":"v0.24.2"},{"url":"https://github.com/idiap/coqui-ai-TTS/releases/tag/v0.24.1","date":"2024-05-29T15:20:41Z","type":"stable","version":"v0.24.1"},{"url":"https://github.com/idiap/coqui-ai-TTS/releases/tag/v0.24.0","date":"2024-05-27T16:22:00Z","type":"stable","version":"v0.24.0"},{"url":"https://github.com/idiap/coqui-ai-TTS/releases/tag/v0.23.1","date":"2024-04-23T14:02:03Z","type":"stable","version":"v0.23.1"},{"url":"https://github.com/idiap/coqui-ai-TTS/releases/tag/v0.23.0","date":"2024-04-19T12:25:40Z","type":"stable","version":"v0.23.0"}]` | `[{"url":"https://github.com/espeak-ng/espeak-ng/releases/tag/1.52.0","date":"2024-12-12T13:47:27Z","type":"stable","version":"1.52.0"},{"url":"https://github.com/espeak-ng/espeak-ng/releases/tag/1.51","date":"2022-04-02T19:43:39Z","type":"stable","version":"1.51"},{"url":"https://github.com/espeak-ng/espeak-ng/releases/tag/1.50","date":"2019-12-02T12:34:16Z","type":"stable","version":"1.50"},{"url":"https://github.com/espeak-ng/espeak-ng/releases/tag/1.49.2","date":"2017-09-24T09:37:08Z","type":"stable","version":"1.49.2"},{"url":"https://github.com/espeak-ng/espeak-ng/releases/tag/1.49.1","date":"2017-01-21T21:20:08Z","type":"stable","version":"1.49.1"},{"url":"https://github.com/espeak-ng/espeak-ng/releases/tag/1.49.0","date":"2016-09-10T10:20:46Z","type":"stable","version":"1.49.0"}]` |
| security.scorecard | - | 4.5 |
| security.vulnerabilities | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=coqui-tts&per_page=100","last_12m":0,"max_severity":null}` | - |

## Capabilities (Text To Speech)

| Capability | Coqui TTS | eSpeak NG |
|---|:--:|:--:|
| **Capabilities** |  |  |
| Voice cloning | - | - |
| Zero shot cloning | - | - |
| Streaming synthesis | - | - |
| Ssml support | - | - |
| Emotion style control | - | - |
| On device offline | - | - |
| Open source | - | - |
| Watermarking provenance | - | - |
| Cloning consent verification | - | - |

*Source: Vioscale. Generated 2026-09-01T15:14:31.822Z. "-" = undocumented, not absent.*