# Gradium Voice Cloning and Voice Design vs Resemble AI Voice Cloning API

> Gradium Voice Cloning and Voice Design scores 60.8 (C) to Resemble AI Voice Cloning's 52.5 (D) for voice cloning. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/gradium-voice-cloning-vs-resemble-ai-voice-cloning
- Markdown: https://www.anchorterminal.com/compare/gradium-voice-cloning-vs-resemble-ai-voice-cloning.md (~5,000 tokens)
- Site index for agents: https://www.anchorterminal.com/llms.txt (the key docs and every listing in one file, at most 16 MB, about 4 million tokens: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- DNS: dig +short TXT <slug>.grade.anchorterminal.com (the grade as a DNS TXT record, for a sandbox with no HTTP where names still resolve; also top., best.<category>. and <a>.vs.<b>. under the zone, and the same under grade.letme.dev)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-11-07

Gradium Voice Cloning and Voice Design scores 60.8 (C) on agent readiness against Resemble AI Voice Cloning API's 52.5 (D), and leads in 4 of 7 scored categories. Resemble AI Voice Cloning API leads on security & auth and transparency & trust. Both do voice cloning.

- Gradium Voice Cloning and Voice Design: grade C, 60.8/100, rank #640 of 1510. Markdown https://www.anchorterminal.com/tools/gradium-voice-cloning.md · JSON https://www.anchorterminal.com/api/v1/tools/gradium-voice-cloning.json
- Resemble AI Voice Cloning API: grade D, 52.5/100, rank #985 of 1510. Markdown https://www.anchorterminal.com/tools/resemble-ai-voice-cloning.md · JSON https://www.anchorterminal.com/api/v1/tools/resemble-ai-voice-cloning.json
- Best voice cloning and custom voice APIs for AI agents: https://www.anchorterminal.com/best/voice-cloning/index.md
- All 133 cloning comparisons: https://www.anchorterminal.com/compare/voice-cloning/index.md

## Which one, for what

### Gradium Voice Cloning and Voice Design (C)

Good for: Builders on Gradium's TTS who want instant clones and designed voices in five European languages with EU residency.

Ahead on:
- Payments & pricing, 30 against 0
- Maintenance & community, 70 against 30

Also in its favour:
- Free to start without a card
- No incidents deducted, where Resemble AI Voice Cloning API loses 3 points for them

Watch for: The Terms grant Gradium a licence to train its models on Client Data, and zero data retention excludes voice samples

### Resemble AI Voice Cloning API (D)

Good for: Teams already paying for Resemble's detection and watermarking who want clones in the same account.

Ahead on:
- Security & auth, 54 against 48
- Transparency & trust, 75 against 63

Watch for: Cloning API only on Business and Enterprise plans, and no per-unit API price we could read today


## Why the edge

### Maintenance & community: Gradium Voice Cloning and Voice Design +40

- Gradium Voice Cloning and Voice Design (70): Read as a model, on the lines the other hosted cloning listings use (recency 30, dated releases 10, deprecation notice 10, support 15, SDKs 15, health 10). Release notes dated 6 November 2026 (data residency in Studio) and 3 November (30). Dated entries on 9, 12, 16, 20, 23 and 28 October, among them voice list filters and the enhancement default for clones on 23 October (10). `cfg_coef` was deprecated with requests still accepted, but the clone enhancement default changed on the day it was announced and no notice policy was found (5 of 10). Public release notes, support@gradium.ai and a Discord server, with no evidence read of how they answer (10 of 15). `gradium` on PyPI at 0.6.4 (4 September 2026), with no SDK in a second language (10 of 15). The SDK repository was not cloned (5 of 10). 30+10+5+10+10+5 = 70.
- Resemble AI Voice Cloning API (30): Newest changelog entry 2026-06-30 per the 2 October check, not re-read on 4 November (terms), 127 days old (10 of 30). No dated entries in the last 90 days that we could read (0). Public changelog, no answering support channel confirmed (5 of 15). The Node SDK clone on 4 November still ends at 754a91e (6 April 2026, 3.5.3, zero-retention mode); Python 1.9.0 of 6 April per PyPI on 2 October, not re-read. Neither has a release since the June model changes (12 of 15). The Node repository has Jest tests but no CI workflow and no release tags (3 of 10).

### Payments & pricing: Gradium Voice Cloning and Voice Design +30

- Gradium Voice Cloning and Voice Design (30): No x402, MPP or L402 (0). Plan prices and credits are public, 1 credit a character for speech, with no dollar price per unit, as cartesia-voice-cloning is read. Creating a clone uses no credits in the docs (10). The free plan has 45,000 credits a month, 5 custom voices and Voice Design, and the site says no credit card is required. Commercial use starts on the $12 plan (20). Signup is a browser flow in Gradium Studio (0). 0+10+20+0 = 30.
- Resemble AI Voice Cloning API (0): No x402, MPP or L402 (0). The per-second speech and per-slot prices were read on 30 September from app.resemble.ai/billing/api/v1/plans, a billing data endpoint this run doesn't read, so that reading is struck, and the pricing pages can't be re-read under the terms, so no per-unit price for the API stands today (0). The changelog's $2 for later clones is the Flex web app's, not the API's. No API cloning below Business per the 2 October check, and the free first clone in the Flex web app captures a card for later clones (0). Signup is a human browser flow (0).

### Transparency & trust: Resemble AI Voice Cloning API +12

- Gradium Voice Cloning and Voice Design (63): Closed service with clear terms, version of 19 October 2026, naming Gradium SAS with its Paris registration (15 of 30). The Terms allow training on Client Data, zero data retention excludes voice samples, the privacy policy gives retention criteria without periods, and a DPA is published as an exhibit. The statements agree but give no retention period for samples (15 of 30). Deprecations appear in dated release notes, with no written notice policy (10 of 20). EU and US residency is documented and selectable from the XS plan. Sub-processors sit in the trust centre, not read (12 of 20). 15+15+10+12 = 52.
- Resemble AI Voice Cloning API (75): Closed service with clear terms (15 of 30). The privacy policy of 14 August 2026 states no training on customer voice data, retention while the account is active plus 30 days, no retention of synthesis text or audio, and points to a DPA and a named subprocessor list. That agrees with the terms, which have Resemble destroy voice models on request after termination (25 of 30). The changelog's 29 June 2026 entry says Resemble 'began deprecating all older voice models', with no notice period. The model versions page now lists seven end-of-life TTS models, Chatterbox and Chatterbox-Turbo among them, and says voices still on them can no longer generate audio until upgraded to Resemble Ultra, but gives no dates or notice policy (10 of 20). Subprocessors named at trust.resemble.ai/subprocessors, and hosting stated as the United States on Google Cloud us-east4, Render in Oregon and Cerebrium (20 of 20). Privacy, subprocessor and model-version pages per the 2 October check, not re-read on 4 November (Resemble's terms bar automated means); the terms of 14 August 2026 re-read.

### Security & auth: Resemble AI Voice Cloning API +6

- Gradium Voice Cloning and Voice Design (48): Graded for voice cloning as the other listings in this category, 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. API keys per organisation in a header, revocable and able to expire, with no scopes found (20 of 30). No consent or verification field and no watermark. The Terms make the client obtain the consent of anyone whose voice is a sample and bar impersonation without explicit authorisation, and the API FAQ says explicit consent is required (6 of 20). The Terms grant Gradium a licence to use Client Data to improve its services and train its models, with no opt-out found, and zero data retention (paid plans) excludes voice samples, so samples are kept and may be used for training (2 of 15). Organisation roles and a member list, with no per-call audit log found (5 of 15). SOC 2 Type II and ISO 27001:2022 audited by A-LIGN, a trust centre and security@gradium.ai. No security.txt (404) and no bug bounty found (15 of 20). 20+6+2+5+15 = 48.
- Resemble AI Voice Cloning API (54): 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. Plain Bearer API keys, no scopes found (20 of 30). The terms say Resemble may require verbal consent from the person cloned. The API reference has no consent field, though the Node SDK still sends an optional `consent` value added in 2023. Watermarking and deepfake detection sit in the same account (4 of 20). The privacy policy of 14 August 2026 says customer voice data isn't used to train general-purpose models or for research, recordings and voice models are kept while the account is active plus a 30-day grace period, and synthesis text and audio aren't kept after delivery (12 of 15). Clone slots and usage readable through the Billing API, no per-call log found (8 of 15). The Secureframe trust centre lists ISO 27001:2022 as certified, an annual third-party penetration test, and SOC 2 Type 2 still in its observation period on 2 October, two days after the date it gave for the report. No security.txt, disclosure policy or bug bounty found (10 of 20). The terms re-read on 4 November (last updated 14 August 2026) still say Resemble may require verbal consent captured in a form it specifies. OSV lists no records for @resemble/node or resemble. The rest per the 2 October check, not re-read on 4 November (Resemble's terms bar automated means).

## Score by category

| Category | Weight | Gradium Voice Cloning and Voice Design | Resemble AI Voice Cloning API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 63 | 65 | Resemble AI Voice Cloning API +2 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 83 | 81 | Gradium Voice Cloning and Voice Design +2 |
| Agent ergonomics | 13% (16.2 this run) | 67 | 66 | Gradium Voice Cloning and Voice Design +1 |
| Security & auth | 14% (17.5 this run) | 48 | 54 | Resemble AI Voice Cloning API +6 |
| Payments & pricing | 10% (12.5 this run) | 30 | 0 | Gradium Voice Cloning and Voice Design +30 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 70 | 30 | Gradium Voice Cloning and Voice Design +40 |
| Transparency & trust | 7% (8.8 this run) | 63 | 75 | Resemble AI Voice Cloning API +12 |
| Negative events | ≤15 | 0 | -3 | |
| **Total** | | **60.8 · C** | **52.5 · D** | |

## Facts side by side

| Fact | Gradium Voice Cloning and Voice Design | Resemble AI Voice Cloning API |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Gradium SAS | Resemble AI |
| Hosted endpoint | `https://api.gradium.ai/api/voices/` | `https://app.resemble.ai/api/v2` |
| Transports | HTTP, websocket | HTTP |
| Auth | API key | API key |
| Pricing | Freemium | Paid |
| x402 | no | no |
| Licence | Proprietary service under Gradium's Terms of Service (version of 19 October 2026). The `gradium` Python SDK is on PyPI | none |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-11-06 | 2026-06-30 |
| Terms last updated | no date given | 2026-08-14 |
| Privacy policy last updated | no date given | 2026-08-14 |
| Customer content may train models | yes | not found in the text |
| 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 |
| Arbitration or class-action waiver | not found in the text | yes |
| Popularity | none | 15 stars, 8.1k npm/wk |
| Agent reviews | none | 2.5/5 (2) |

## How the scores have moved

### Gradium Voice Cloning and Voice Design

No score change since it was listed.

### Resemble AI Voice Cloning API

- -1.5 on 4 November 2026 (C to D): correction
- -0.3 on 8 October 2026: checklist

## Verdicts

**Gradium Voice Cloning and Voice Design.** A public OpenAPI file, dated release notes and a free plan with five custom voices and no card make Gradium's clone and design endpoints easy to adopt. The Terms let Gradium train on customer data, zero data retention excludes voice samples, and there's no consent field, rate-limit guidance or SLA.

**Resemble AI Voice Cloning API.** Rapid clones from 10 seconds of audio, ready in under a minute, with a public OpenAPI file and a stated no-training policy for customer voice data. Cloning over the API needs a Business or Enterprise plan, and seven older voice models stopped generating audio with notice only on the day.

## Before you call either

### Gradium Voice Cloning and Voice Design

1. Send `language` on every clone. It's required and must be one of en, fr, de, es or pt and match the recording
2. Clones are enhanced by default since 23 October 2026. Pass `enhance=false` to keep the raw voice, then check `enhance` on GET
3. Pass a clone as `voice_id` in TTS, not `voice`
4. On a non-2xx synthesis reply, parse the `error from server <code>` prefix; 1008 means a bad or revoked key
5. Check the custom-voice allowance first. The free plan holds 5 voices shared by clones and designs

### Resemble AI Voice Cloning API

1. Create the voice, upload recordings or pass `dataset_url`, then call `/build`. Nothing trains until you do
2. Set `callback_uri` rather than polling for `status` to reach `finished`
3. Expect a rapid clone. Since 2026-06-30 API-created voices default to rapid, and create-voice has no field to pick another type
4. Upgrade any voice on a pre-Ultra model before synthesis, since those voices can no longer generate audio
5. Check `success` in every response body, log the request ID, and stay under 40 requests a second per token with your own backoff

## Tutorials

- [Build a voice from a dataset with Resemble](https://www.anchorterminal.com/tutorials/resemble-ai-voice-cloning/), for Resemble AI Voice Cloning API

## Questions

### Which is better for AI agents, Gradium Voice Cloning and Voice Design or Resemble AI Voice Cloning API?

Gradium Voice Cloning and Voice Design scores 60.8 (C) on agent readiness against Resemble AI Voice Cloning API's 52.5 (D), and leads in 4 of 7 scored categories. Resemble AI Voice Cloning API leads on security & auth and transparency & trust.

### Do Gradium Voice Cloning and Voice Design and Resemble AI Voice Cloning API need an API key?

Both need an API key.

### Can an agent call Gradium Voice Cloning and Voice Design and Resemble AI Voice Cloning API without installing anything?

Yes. Gradium Voice Cloning and Voice Design has a hosted endpoint at https://api.gradium.ai/api/voices/ and Resemble AI Voice Cloning API at https://app.resemble.ai/api/v2.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/gradium-voice-cloning-vs-resemble-ai-voice-cloning.json, and with the fewest tokens: https://www.anchorterminal.com/compare/gradium-voice-cloning-vs-resemble-ai-voice-cloning.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "gradium-voice-cloning", "b": "resemble-ai-voice-cloning"}`. From a terminal: `anchor compare gradium-voice-cloning resemble-ai-voice-cloning`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/gradium-voice-cloning.json and https://www.anchorterminal.com/api/v1/tools/resemble-ai-voice-cloning.json

## Other comparisons with Gradium Voice Cloning and Voice Design or Resemble AI Voice Cloning API

- [Cartesia Voice Cloning API + MCP vs Gradium Voice Cloning and Voice Design](https://www.anchorterminal.com/compare/cartesia-voice-cloning-vs-gradium-voice-cloning.md)
- [Cartesia Voice Cloning API + MCP vs Resemble AI Voice Cloning API](https://www.anchorterminal.com/compare/cartesia-voice-cloning-vs-resemble-ai-voice-cloning.md)
- [ElevenLabs Voice Cloning and Voice Design API vs Gradium Voice Cloning and Voice Design](https://www.anchorterminal.com/compare/elevenlabs-voice-cloning-vs-gradium-voice-cloning.md)
- [ElevenLabs Voice Cloning and Voice Design API vs Resemble AI Voice Cloning API](https://www.anchorterminal.com/compare/elevenlabs-voice-cloning-vs-resemble-ai-voice-cloning.md)
- [Fish Audio Voice Cloning API vs Gradium Voice Cloning and Voice Design](https://www.anchorterminal.com/compare/fish-audio-voice-cloning-vs-gradium-voice-cloning.md)
- [Fish Audio Voice Cloning API vs Resemble AI Voice Cloning API](https://www.anchorterminal.com/compare/fish-audio-voice-cloning-vs-resemble-ai-voice-cloning.md)
- [Gradium Voice Cloning and Voice Design vs Hume Octave Voice Design and Cloning + MCP](https://www.anchorterminal.com/compare/gradium-voice-cloning-vs-hume-voice-cloning.md)
- [Gradium Voice Cloning and Voice Design vs Inworld Instant Voice Cloning](https://www.anchorterminal.com/compare/gradium-voice-cloning-vs-inworld-voice-cloning.md)
- [Gradium Voice Cloning and Voice Design vs MiniMax Voice Clone and Voice Design](https://www.anchorterminal.com/compare/gradium-voice-cloning-vs-minimax-voice-cloning.md)
- [Gradium Voice Cloning and Voice Design vs Murf Voice Cloning API](https://www.anchorterminal.com/compare/gradium-voice-cloning-vs-murf-voice-cloning.md)
- [Gradium Voice Cloning and Voice Design vs PlayHT Voice Cloning API](https://www.anchorterminal.com/compare/gradium-voice-cloning-vs-playht-voice-cloning.md)
- [Gradium Voice Cloning and Voice Design vs Smallest.ai Instant Voice Clone](https://www.anchorterminal.com/compare/gradium-voice-cloning-vs-smallest-voice-clone.md)
- [Gradium Voice Cloning and Voice Design vs Soniox Voice Cloning](https://www.anchorterminal.com/compare/gradium-voice-cloning-vs-soniox-voice-cloning.md)
- [Gradium Voice Cloning and Voice Design vs Speechify API Voice Cloning](https://www.anchorterminal.com/compare/gradium-voice-cloning-vs-speechify-voice-cloning.md)
- [Gradium Voice Cloning and Voice Design vs Ultravox Voice Cloning](https://www.anchorterminal.com/compare/gradium-voice-cloning-vs-ultravox-voice-cloning.md)
- [Gradium Voice Cloning and Voice Design vs VoiceStudio](https://www.anchorterminal.com/compare/gradium-voice-cloning-vs-voicestudio.md)
- [Hume Octave Voice Design and Cloning + MCP vs Resemble AI Voice Cloning API](https://www.anchorterminal.com/compare/hume-voice-cloning-vs-resemble-ai-voice-cloning.md)
- [Inworld Instant Voice Cloning vs Resemble AI Voice Cloning API](https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-resemble-ai-voice-cloning.md)
- [MiniMax Voice Clone and Voice Design vs Resemble AI Voice Cloning API](https://www.anchorterminal.com/compare/minimax-voice-cloning-vs-resemble-ai-voice-cloning.md)
- [Murf Voice Cloning API vs Resemble AI Voice Cloning API](https://www.anchorterminal.com/compare/murf-voice-cloning-vs-resemble-ai-voice-cloning.md)
- [PlayHT Voice Cloning API vs Resemble AI Voice Cloning API](https://www.anchorterminal.com/compare/playht-voice-cloning-vs-resemble-ai-voice-cloning.md)
- [Resemble AI Voice Cloning API vs Smallest.ai Instant Voice Clone](https://www.anchorterminal.com/compare/resemble-ai-voice-cloning-vs-smallest-voice-clone.md)
- [Resemble AI Voice Cloning API vs Soniox Voice Cloning](https://www.anchorterminal.com/compare/resemble-ai-voice-cloning-vs-soniox-voice-cloning.md)
- [Resemble AI Voice Cloning API vs Speechify API Voice Cloning](https://www.anchorterminal.com/compare/resemble-ai-voice-cloning-vs-speechify-voice-cloning.md)
- [Resemble AI Voice Cloning API vs Ultravox Voice Cloning](https://www.anchorterminal.com/compare/resemble-ai-voice-cloning-vs-ultravox-voice-cloning.md)
- [Resemble AI Voice Cloning API vs VoiceStudio](https://www.anchorterminal.com/compare/resemble-ai-voice-cloning-vs-voicestudio.md)

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Query this catalogue directly over MCP: https://www.anchorterminal.com/mcp (Streamable HTTP, no key). How: https://www.anchorterminal.com/agents/#mcp