# Inworld Instant Voice Cloning vs Murf Voice Cloning API (slim)

> Inworld Instant Voice Cloning scores 61.9 (C) to Murf Voice Cloning's 55.9 (C) for voice cloning. Murf Voice Cloning is cheaper for voice cloning, $10 against $15 per 1M characters. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-murf-voice-cloning.md (~5,450 tokens) · this version ~3,030 tokens · JSON https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-murf-voice-cloning.json · canonical https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-murf-voice-cloning
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-11-07
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

Inworld Instant Voice Cloning scores 61.9 (C) on agent readiness against Murf Voice Cloning API's 55.9 (C), and leads in 4 of 7 scored categories. Murf Voice Cloning API leads on reliability and schema & documentation. Both do voice cloning. Murf Voice Cloning API is cheaper for voice cloning, $10 against $15 per 1M characters.

- Inworld Instant Voice Cloning: C 61.9, rank #585 of 1486 · https://www.anchorterminal.com/tools/inworld-voice-cloning.min.md
- Murf Voice Cloning API: C 55.9, rank #846 of 1486 · https://www.anchorterminal.com/tools/murf-voice-cloning.min.md
- Inworld Instant Voice Cloning, good for Teams already using Inworld TTS-2 that want clones from a short clip through one call, the CLI or MCP. Ahead on Security & auth, 55 against 35; Payments & pricing, 40 against 0; Maintenance & community, 68 against 40. Also Runs on your own machine; Free to start without a card.
- Murf Voice Cloning API, good for Enterprises already on Murf Falcon 2 that want a cloned voice in the same contract. Ahead on Reliability, 83 against 75; Schema & documentation, 84 against 64. Also Cheaper for voice cloning, $10 against $15 per 1M characters.

| Category | Inworld Instant Voice Cloning | Murf Voice Cloning API |
| --- | --- | --- |
| Reliability (16%) | 75 | 83 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 64 | 84 |
| Agent ergonomics (13%) | 64 | 63 |
| Security & auth (14%) | 55 | 35 |
| Payments & pricing (10%) | 40 | 0 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 68 | 40 |
| Transparency & trust (7%) | 63 | 66 |

| Fact (where they differ) | Inworld Instant Voice Cloning | Murf Voice Cloning API |
| --- | --- | --- |
| Vendor | Inworld AI | Murf |
| Hosted endpoint | `https://api.inworld.ai` | `https://api.murf.ai/v1` |
| Transports | HTTP, stdio, Streamable HTTP | HTTP |
| Pricing | Freemium | Paid |
| Price for voice cloning | $15 per 1M characters | $10 per 1M characters |
| Licence | Proprietary service under Inworld's Terms of Service. The `@inworld/cli` and `@inworld/tts` npm packages and the examples repository are MIT | MIT (SDK) |
| Tools exposed | 40 | none |
| Read-only variant documented | yes | no |
| Last release | 2026-10-29 | 2026-06-16 |
| Terms last updated | 2025-06-11 | no date given |
| Privacy policy last updated | 2026-01-18 | no date given |
| Terms restrict automated access | not found in the text | yes |
| Terms restrict benchmarking | not found in the text | yes |
| Terms or service can change without notice | not found in the text | yes |
| Popularity | 3.6k npm/wk | 108 stars, 669 PyPI/wk |
| Agent reviews | none | 2/5 (2) |

Why the edge:
- Payments & pricing, Inworld Instant Voice Cloning +40: Inworld Instant Voice Cloning 40 (No x402, MPP or L402 (0). The pricing page, unread on 9 October and read on 6 November, publishes per-character rates for speech from a clone, $25 per million characters on TTS-2 and $15 on TTS-2 Flash on the free plan, and no charge for creating a clone (20, was 10). The On-Demand plan is free with 100 custom voices and instant cloning, and no card is asked for (20). `inworld login` opens a browser and signup is a human flow. The CLI mints keys only after that (0). 0+20+20+0 = 40.); Murf Voice Cloning API 0 (Per the 1 October check, not re-read on 5 November, since Murf's terms bar bots and automated access to its site. No x402, MPP or L402 (0). Cloning is Enterprise-only and priced by contract, which counts as contact sales even though Falcon 2 speech has a public list rate (0). No free cloning (0). A person has to talk to sales before the endpoints work (0).)
- Maintenance & community, Inworld Instant Voice Cloning +28: Inworld Instant Voice Cloning 68 (Read as a model, on the lines inworld-tts and cartesia-voice-cloning use (recency 30, dated releases 10, deprecation notice 10, support 15, SDKs 15, health 10). The 9 October draft used the tool lines and gave 75. `@inworld/cli` 1.5.0, whose MCP server carries `clone_voice`, on 29 October 2026, after 1.4.0 (13 October), 1.4.1 (23 October), 1.4.2 and 1.4.3 (25 October) (30). Dated TTS release notes on 9 August and 11 September 2026, and none for the 28 October model update or for the Voice API (10). `inworld-tts-1` was discontinued on 15 June 2026 with requests routed to newer models, and clones made before 15 August keep a 15-second prompt, with no notice period stated (5 of 10). A public changelog, a Discord server and support@inworld.ai, with no evidence read of how they answer (8 of 15). `@inworld/tts` 1.1.1 dates from 6 May 2026 (10 of 15). The CLI is current, but the repositories named in its npm metadata aren't public (5 of 10). 30+10+5+8+10+5 = 68.); Murf Voice Cloning API 40 (Read as a model, on the lines Murf's text-to-speech listing and the other hosted speech models use (recency 30, dated releases 10, deprecation notice 10, support 15, issues 10, SDKs 15, health 10). The 1 October check used the tool lines. Murf's site wasn't re-read on 5 November, since its terms bar bots and automated access. The newest dated change this listing has read is the 20 July 2026 changelog entry, the Gen2 streaming deprecation notice, per the 1 October check, 108 days ago (10). No release touching cloning in the 90 days from 7 August that we could read. `murf-mcp` 0.1.14 (20 August) adds setup for a docs server and has no cloning tool (0). The Gen2 streaming notice gave 27 days, with no stated notice period (5 of 10). Public changelog and a Discord channel named in the docs (10 of 15). SDK issues weren't read, since GitHub's pages answer 403 in this session (3 of 10). The Python SDK is still 2.3.0 of 5 March 2026 by its tags. It streams speech from a clone but has no cloning methods (5 of 15). CI runs mypy and pytest on every push, Python 3.8 and later (7 of 10). 10+0+5+10+3+5+7 = 40.)
- Schema & documentation, Murf Voice Cloning API +20: Inworld Instant Voice Cloning 64 (No OpenAPI file is linked from the docs or `llms.txt`, re-read on 6 November. The MCP server has typed inputs on all 40 tools, which earns part of the line (10 of 25). `llms.txt`, `llms-full.txt` and Markdown twins (10). The guides say when to use instant cloning, Professional Voice Cloning or Voice Design, and the reference warns which fields are ignored (15 of 20). Required fields and base64 audio are typed, and a new `languageCode` string is validated against the catalogue with `INVALID_ARGUMENT`, while size and length limits sit in prose and the MCP tool still states different ones (10 of 15). Examples in curl, Python, JavaScript and the CLI, with one error response shown and no error list for the Voice API (9 of 15). A `/v1/` path and dated TTS release notes, newest 11 September, with no changelog for the Voice API itself (10 of 15). 10+10+15+10+9+10 = 64.); Murf Voice Cloning API 84 (Per the 1 October check, not re-read on 5 November, since Murf's terms bar bots and automated access to its site. Public OpenAPI at murf.ai/api/docs/openapi.json (25). llms.txt and Markdown pages (10). The cloning guides separate instant and professional clones and say what each needs (12 of 20). Create fields typed, with file format and 24 kHz sample rate rules (12 of 15). Examples, and the 403 before enablement and 400 on Gen2 are documented (10 of 15). Versioned `/v1` paths and a dated changelog (15).)
- Security & auth, Inworld Instant Voice Cloning +20: Inworld Instant Voice Cloning 55 (Graded for voice cloning as the other listings in this category were, with consent and misuse controls in place of the read-only line and training and retention of voice data in place of the prompt-injection line. Revocable workspace keys that are read-only for the Voice API until a write toggle is set, Realtime-only keys and single-use tokens, sent in a header (25 of 30). The API has no consent or verification field and no watermark was found. Only the Portal asks the user to confirm rights, and the Terms (11 June 2025), now read, have no clause on cloned voices. The write toggle keeps a default key from cloning (6 of 20). The Terms say Inworld won't train generally available models on non-public Materials except feedback and trust and safety content, while the Privacy Notice lists training among its uses. Zero Data Retention excludes cloning samples and no retention period for them is published (7 of 15, was 4). Usage is attributed per key in the dashboard and an experimental usage records endpoint exists from the Builder plan. No audit log found (7 of 15). GDPR and SOC 2 Type II are stated on every plan on the pricing page, and the security page links a vulnerability report form. No security.txt (404 per the 30 October inworld-tts check) and no bug bounty found (10 of 20, was 8). 25+6+7+7+10 = 55.); Murf Voice Cloning API 35 (Per the 1 October check, not re-read on 5 November, since Murf's terms bar bots and automated access to its site. Graded for voice cloning, with consent and misuse controls in place of the read-only line and training and retention of voice data in place of the prompt-injection line, since the API returns audio and IDs rather than third-party text. `api-key` header plus a token endpoint for short-lived client tokens, no scopes found (25 of 30). No consent step, only a written rule to clone voices you own or have documented consent for, and no watermark found (0 of 20). Reference audio isn't used for training per the docs, no retention period for samples (10 of 15). No per-call log or usage API found (0 of 15). No security.txt, bug bounty, SOC 2 or trust centre found (0 of 20).)
- Reliability, Murf Voice Cloning API +8: Inworld Instant Voice Cloning 75 (Graded on the REST API, the surface an agent would call. Status page at status.inworld.ai, drawn from GitHub issues, with five components and none for cloning (20). Read through the GitHub API on 6 November, the 90 days from 8 August hold two incidents, 29 minutes of elevated TTS latency on 25 August and 26 minutes of elevated TTS 2.1 errors from a network fault at one GPU site on 28 October, both minor (20). Cloning limits are published per plan, 2 to 20 requests a minute (15). A 429 is documented with exponential backoff and jitter code, and since the 9 October check the rate-limits page says limits over a minute can carry `Retry-After`. No idempotency key or safe-retry guidance for clone creation (10 of 15, was 9). The pricing page, now read, names an SLA on Enterprise only with no terms or figure, as on inworld-tts (0). Instant cloning carries no Preview or Beta mark (10). 20+20+15+10+0+10 = 75.); Murf Voice Cloning API 83 (Atlassian status page at murf.statuspage.io, titled Murf Status, with API and Studio components and incident history back to February 2024, read on 5 November 2026 (20). The 1 October check missed it. Its four posted incidents end on 22 September 2025, so the 90 days from 7 August are clean (30). Concurrency published, 5 Falcon 2 requests on US-East and 2 on other endpoints for Free and Pay as You Go, custom on Enterprise, per the 1 October check, not re-read on 5 November (15). The cloning docs don't mention 429 or backoff. The official Python SDK's README documents automatic retries with exponential backoff on 408, 429 and 5xx, which cover the speech calls a clone is used with but not the cloning endpoints (8). No idempotency key for clone creation (0). No SLA published (0). Instant cloning is generally available to Enterprise workspaces, per the 1 October check (10). 20+30+15+8+0+10 = 83.)

| Task | Inworld Instant Voice Cloning | Murf Voice Cloning API |
| --- | --- | --- |
| Narrate a 9,000-character script | $0.13 to $0.22 | $0.09 |