What is eSpeak NG?
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.
eSpeak NG pricing
We don't have eSpeak NG's full plan breakdown yet (its pricing page resisted automated reading). Here's what we could confirm. Always check live pricing for exact numbers.
Free and open source
Platform & deployment
Independently observed- CLI
- macOS
- Linux
- Android
- Windows
- Self-hosted
Integrations (3)
Independently observed- MBROLA
- SAPI5
- C API library integration
eSpeak NG alternatives
Other text to speech we track, ranked by the same independent score.
- Murf AIAI platform for generating natural-sounding voiceovers and conversational voice agentsmedium · 53%
- ElevenLabsAI-powered voice technology platform for generating speech, creating voice agents, and producing audio contentlow · 43%
- Amazon PollyCloud-based text-to-speech service that converts written content into natural-sounding spoken audiomedium · 61%
- Piperlow · 20%
- WellSaid LabsGenerate professional-quality AI voiceovers from text using realistic voices modeled from professional voice actorslow · 44%
- Coqui TTSlow · 20%
Compare eSpeak NG
Side by side against other text to speech, attribute by attribute, with a source on every value.
The Vioscale score: one lens on the evidence
Not user reviews and not a paid placement: a confidence-weighted blend of the independent signals below (adoption, activity, security posture, and more), which you can sort and re-weight yourself. Vendors can correct their listing but can never move their rank, and stars are weighted low as a vanity metric. It is one way to read the evidence for eSpeak NG, not the verdict.
| Signal | Score | Weight | Contribution | Evidence |
|---|---|---|---|---|
| Pricing transparency | 80 | 0.08 | 6.7 | ✓ |
| Price level | 100 | 0.05 | 5.2 | ✓ |
| Development activity | 49 | 0.09 | 4.6 | ✓ |
| Stars | 72 | 0.03 | 1.9 | ✓ |
| Security score | 45 | 0.04 | 1.9 | ✓ |
| Integrations | 17 | 0.09 | 1.6 | ✓ |
| Reliability | 0 | 0.07 | 0.0 | - |
| Capabilities | 0 | 0.08 | 0.0 | - |
| Dependent projects | 0 | 0.06 | 0.0 | - |
| Release cadence | 0 | 0.05 | 0.0 | ✓ |
| Security posture | 0 | 0.07 | 0.0 | - |
| Package downloads | 0 | 0.14 | 0.0 | - |
| Developer Q&A activity | 0 | 0.06 | 0.0 | - |
Computed . Re-weight it by intent, or see the full method.
All data & sourcesshow ↓
Every value we hold, with its source, retrieval date, and confidence. This is the evidence behind the score: don't trust it, verify it.
Activity
| Attribute | Value | Evidence |
|---|---|---|
| Commits last 30d | 36 | mediumsource · 2026-08-26 · 65% |
Adoption
| Attribute | Value | Evidence |
|---|---|---|
| Github stars | 6,762 | highsource · 2026-08-26 · 90% |
Integrations
| Attribute | Value | Evidence |
|---|---|---|
| Count | 3 | mediumsource · 2026-08-19 · 60% |
Language
| Attribute | Value | Evidence |
|---|---|---|
| Primary | C | highsource · 2026-08-26 · 90% |
License
| Attribute | Value | Evidence |
|---|---|---|
| Spdx | GPL-3.0 | highsource · 2026-08-26 · 95% |
Pricing
Release
Security
| Attribute | Value | Evidence |
|---|---|---|
| Scorecard | 4.5 | highsource · 2026-08-26 · 90% |