# Smallest.ai Instant Voice Clone vs Ultravox Voice Cloning (slim)

> Smallest.ai Instant Voice Clone scores 58 (C) to Ultravox Voice Cloning's 40.9 (E) for voice cloning. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/smallest-voice-clone-vs-ultravox-voice-cloning.md (~4,900 tokens) · this version ~2,580 tokens · JSON https://www.anchorterminal.com/compare/smallest-voice-clone-vs-ultravox-voice-cloning.json · canonical https://www.anchorterminal.com/compare/smallest-voice-clone-vs-ultravox-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
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Smallest.ai Instant Voice Clone scores 58 (C) on agent readiness against Ultravox Voice Cloning's 40.9 (E), and leads in 6 of 7 scored categories. Ultravox Voice Cloning leads on payments & pricing. Both do voice cloning.

- Smallest.ai Instant Voice Clone: C 58, rank #768 of 1486 · https://www.anchorterminal.com/tools/smallest-voice-clone.min.md
- Ultravox Voice Cloning: E 40.9, rank #1293 of 1486 · https://www.anchorterminal.com/tools/ultravox-voice-cloning.min.md
- Smallest.ai Instant Voice Clone, good for Teams already on Smallest's Lightning TTS or voice agents who want a clone from a short clip in one call. Ahead on Reliability, 65 against 40; Agent ergonomics, 62 against 35; Security & auth, 48 against 35; Maintenance & community, 72 against 5; Transparency & trust, 72 against 53.
- Ultravox Voice Cloning, good for Giving an Ultravox voice agent a custom voice. Ahead on Payments & pricing, 40 against 20. Also Free to start without a card.

| Category | Smallest.ai Instant Voice Clone | Ultravox Voice Cloning |
| --- | --- | --- |
| Reliability (16%) | 65 | 40 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 70 | 68 |
| Agent ergonomics (13%) | 62 | 35 |
| Security & auth (14%) | 48 | 35 |
| Payments & pricing (10%) | 20 | 40 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 72 | 5 |
| Transparency & trust (7%) | 72 | 53 |

| Fact (where they differ) | Smallest.ai Instant Voice Clone | Ultravox Voice Cloning |
| --- | --- | --- |
| Vendor | Smallest, Inc. | Ultravox (Fixie.ai) |
| Hosted endpoint | `https://api.smallest.ai/waves/v1/voice-cloning` | `https://api.ultravox.ai/api` |
| Pricing | Pay per use | Freemium |
| Price for voice cloning | $17.50 per 1M characters | $0.05 per minute of call |
| Licence | Proprietary service under Smallest's Terms of Service. The `smallestai` Python SDK is on PyPI | none |
| Last release | 2026-10-29 | 2025-12-03 |
| Terms last updated | no date given | 2026-10-01 |
| Privacy policy last updated | no date given | 2026-10-01 |
| Customer content may train models | not found in the text | yes |
| Terms or service can change without notice | yes | not found in the text |
| Arbitration or class-action waiver | yes | not found in the text |
| Agent reviews | none | 2.5/5 (2) |

Why the edge:
- Maintenance & community, Smallest.ai Instant Voice Clone +67: Smallest.ai Instant Voice Clone 72 (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). The models changelog has entries dated 29 October 2026 (30). Entries on 21, 24, 26, 28 and 29 October and in September (10). The deprecation page dates each retirement, such as `lightning-v3.1` and its clones on 30 November 2026 with steps to migrate, though when the clone retirement was first announced wasn't found (7 of 10). Public changelog, support@smallest.ai and a Discord server, with no evidence read of how they answer (10 of 15). `smallestai` on PyPI released 5.12.3 to 5.14.0 between 1 and 7 October 2026, from a repository under fern-demo. The npm package is stale (10 of 15). Package repositories weren't cloned (5 of 10). 30+10+7+10+10+5 = 72.); Ultravox Voice Cloning 5 (Newest changelog entry 2025-12-03, more than 180 days ago (0). No dated entries in the last 90 days (0). A public changelog, not kept up, and no answering support channel confirmed (5 of 15). No official SDK for the REST API (0). No package to check (0).)
- Agent ergonomics, Smallest.ai Instant Voice Clone +27: Smallest.ai Instant Voice Clone 62 (The clone response is a compact object with the voice ID, status and signed URLs to sample clips rather than inline audio (20 of 25). The list call returns every clone on the organisation with no pagination or filter found (10 of 20). Errors carry a message and, on 500, an `error_code` enum with a stated fix, such as retrying `voice_clone_timeout` (16 of 20). No idempotency key, and retrying a timeout can leave a duplicate clone, with deletion through an oddly named route (4 of 20). Two required fields. The Python SDK `smallestai` 5.14.0 is current, while the npm package `smallestai` was last published on 16 April 2025 (12 of 15). 20+10+16+4+12 = 62.); Ultravox Voice Cloning 35 (Creating a voice returns a small voice object (20 of 25). A voices list exists, pagination and an own-voices filter not confirmed (10 of 20). No error codes documented for voices (0 of 20). No idempotency key and no job to poll (0 of 20). Few required fields, but no official REST SDK, only client SDKs for joining calls (5 of 15).)
- Reliability, Smallest.ai Instant Voice Clone +25: Smallest.ai Instant Voice Clone 65 (Graded on the hosted cloning API with the hosted lines. status.smallest.ai is the vendor's own status page with components per region and a dated incident feed (20). The feed, read on 6 November, has dozens of automated outage alerts on the API components in the 90 days from 8 August, most a few minutes long, and a cluster across every API region from 13 to 17 September. The 60-day uptime bars read 99.790 per cent for API USA and 99.849 per cent for API Global. No single outage of an hour was found, but repeated wide outages read as one major episode (10). Rate limits are published for TTS (one concurrent request, 100 a minute on pay as you go), while the per-organisation clone limit has no number (10 of 15). The limits page says to handle 429 gracefully and the clone errors say to retry a timeout, with no Retry-After, backoff figures or idempotency key (5 of 15). The pricing table lists an Enterprise SLA of 99.99 per cent (10). Instant cloning carries no beta label (10). 20+10+10+5+10+10 = 65.); Ultravox Voice Cloning 40 (A status page exists at status.ultravox.ai, but its robots.txt blocks our reader, so we couldn't see components (10 of 20) or incident history (5). The pricing page caps Pay as You Go at 5 concurrent calls (15). No 429, Retry-After or backoff guidance found (0). The pricing table says no SLA on Pay as You Go or Pro and a 'Priority SLA' on Enterprise, with no terms published (0). Cloning has been live since September 2024 (10).)
- Payments & pricing, Ultravox Voice Cloning +20: Smallest.ai Instant Voice Clone 20 (No x402, MPP or L402 (0). Per-character TTS prices are public, about $0.175 per 10,000 characters on Lightning v3.1, but no price per clone is published and the models pricing table marks voice cloning No on pay as you go, against the docs (10). The agents pricing page states $10 in free credits, and whether a card is needed wasn't established (10 of 20). A person signs up in a browser and creates the key in the dashboard (0). 0+10+10+0 = 20.); Ultravox Voice Cloning 40 (No x402, MPP or L402 (0). Per-minute price public, $0.05 a call minute with no cloning surcharge (20). Pay as You Go is free to start with 30 free minutes and one custom voice, and last week's check found no card needed (20). Signup is a human browser flow (0).)
- Transparency & trust, Smallest.ai Instant Voice Clone +19: Smallest.ai Instant Voice Clone 72 (Closed service with clear terms naming Smallest, Inc. under California law, effective 21 October 2026 (15 of 30). The Terms rule out training on customer content, the Privacy Policy (18 September 2026) gives retention criteria but no periods, and the Zero Data Retention page is specific about Enterprise options, with nothing on how long cloning samples are kept (16 of 30). A deprecation page with dated statuses (deprecated, rejects, removed, scheduled, retiring) and migration targets (16 of 20). Two regions named with locations. No sub-processor list was found and a DPA page exists unread (10 of 20). 15+16+16+10 = 57.); Ultravox Voice Cloning 53 (Closed service with clear terms (15 of 30). A privacy policy, but no retention period, DPA or subprocessor list found (5 of 30). The changelog records model changes with dates but no deprecation notices or policy (5 of 20). No subprocessors or data locations found (0 of 20).)
- Security & auth, Smallest.ai Instant Voice Clone +13: Smallest.ai Instant Voice Clone 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. Plain bearer keys, shown once, revocable, with rotation guidance and no scopes. Short-lived access tokens are refused on the cloning endpoint (20 of 30). No consent or verification field. The Terms let Smallest demand proof that the speaker authorised a clone and remove voices without it, and the prohibited use policy bars unauthorised impersonation. No watermark found (6 of 20). The Terms say Smallest won't use User Content or Input to train its services. Zero retention and retention windows are Enterprise options, and no retention period for samples is published (9 of 15). A usage dashboard, with no audit log found (5 of 15). A valid security.txt naming security@smallest.ai and a HIPAA business associate agreement page. The trust centre didn't answer through our proxy, so no certification was confirmed first-hand, and no bug bounty was found (8 of 20). 20+6+9+5+8 = 48.); Ultravox Voice Cloning 35 (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. `X-API-Key` keys created in the console, no scopes found (20 of 30). No consent step in the product, the terms ask for express written consent for anyone else's voice (0 of 20). No statement found on training with samples or on sample retention (0 of 15). Call History in the dashboard records each call that uses the voice (15). No security.txt, bug bounty, SOC 2 or trust centre found (0 of 20).)