# IBM Watson Speech to Text vs Rev AI Speech-to-Text API (slim)

> Rev AI Speech-to-Text scores 55.5 (C) to IBM Watson Speech to Text's 54.5 (C) for speech-to-text. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/ibm-watson-stt-vs-rev-ai-stt.md (~5,300 tokens) · this version ~2,830 tokens · JSON https://www.anchorterminal.com/compare/ibm-watson-stt-vs-rev-ai-stt.json · canonical https://www.anchorterminal.com/compare/ibm-watson-stt-vs-rev-ai-stt
- 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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Rev AI Speech-to-Text API scores 55.5 (C) on agent readiness against IBM Watson Speech to Text's 54.5 (C), and leads in 3 of 7 scored categories. IBM Watson Speech to Text leads on agent ergonomics, security & auth, payments & pricing and transparency & trust. Both do speech-to-text.

- IBM Watson Speech to Text: C 54.5, rank #904 of 1486 · https://www.anchorterminal.com/tools/ibm-watson-stt.min.md
- Rev AI Speech-to-Text API: C 55.5, rank #862 of 1486 · https://www.anchorterminal.com/tools/rev-ai-stt.min.md
- IBM Watson Speech to Text, good for Enterprises on IBM Cloud needing custom acoustic models, HIPAA on Premium and many locations. Ahead on Agent ergonomics, 66 against 52; Security & auth, 68 against 40; Payments & pricing, 40 against 20; Transparency & trust, 80 against 69.
- Rev AI Speech-to-Text API, good for English batch jobs where a human-checked transcript may be needed later, through the same API. Ahead on Reliability, 75 against 40; Schema & documentation, 80 against 55; Maintenance & community, 40 against 33. Also A hosted endpoint, with nothing to install.

| Category | IBM Watson Speech to Text | Rev AI Speech-to-Text API |
| --- | --- | --- |
| Reliability (16%) | 40 | 75 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 55 | 80 |
| Agent ergonomics (13%) | 66 | 52 |
| Security & auth (14%) | 68 | 40 |
| Payments & pricing (10%) | 40 | 20 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 33 | 40 |
| Transparency & trust (7%) | 80 | 69 |

| Fact (where they differ) | IBM Watson Speech to Text | Rev AI Speech-to-Text API |
| --- | --- | --- |
| Vendor | IBM | Rev |
| Hosted endpoint | no (local only) | `https://api.rev.ai/speechtotext/v1` |
| Transports | HTTP, websocket | HTTP |
| Licence | none | MIT (SDKs) |
| Tools exposed | 0 | none |
| llms.txt | no | yes |
| Last release | 2026-06-29 | 2024-11-27 |
| Terms last updated | no date given | 2026-05-15 |
| Privacy policy last updated | 2026-08-25 | 2026-02-03 |
| Customer content may train models | not found in the text | yes |
| Terms restrict automated access | not found in the text | yes |
| Popularity | none | 36 stars, 16k npm/wk, 130k PyPI/wk |
| Agent reviews | none | 2.5/5 (2) |

Why the edge:
- Reliability, Rev AI Speech-to-Text API +35: IBM Watson Speech to Text 40 (IBM Cloud has a status page at cloud.ibm.com/status, but it is drawn by script and showed no components or history to our reader, read as gemini-live's script-shell page was (10 of 20, and 5 for no readable history). Plus allows up to 100 concurrent transcription requests across WebSocket and HTTP (15). No 429 or backoff guidance was found in the API reference or the docs repository (0). No SLA was read for the service (0, unchecked). Next-generation and large speech models are GA, language by language (10). 10 + 5 + 15 + 0 + 0 + 10 = 40.); Rev AI Speech-to-Text API 75 (Statuspage at status.rev.ai with component history (20), per the 1 October check, not re-read on 4 November, because the Rev terms (updated 14 October 2026) bar using any automated system to extract content from Rev's web sites, so every Rev host is paused for this run. The history feed read on 1 October showed no incident since 13 May 2026, and the page has posted eight incidents since September 2022. The window from 6 August is held at what that reading supports, with 2 October to 4 November unread (30). Limits published with numbers, 10,000 async submissions and 500 processing jobs per 10 minutes and 10 concurrent streams (15). No 429 handling, Retry-After or backoff guidance in the async reference, the get-started page or the changelog (0). No SLA found, and the pricing page names none (0). Async and streaming are GA (10). All per the 1 and 2 October checks. 20+30+15+0+0+10 = 75.)
- Security & auth, IBM Watson Speech to Text +28: IBM Watson Speech to Text 68 (Model reading of the checklist, with training and retention in place of the least-privilege and injection lines. IAM API keys per instance with Reader, Writer and Manager roles and short-lived bearer tokens (30). The WebSocket interface takes the token as an `access_token` query parameter, so 10 off (20 of 30). Request and response data are logged by default to improve the service, and any account can opt out per account or per request (10 of 20). Async results expire after a week by default (`results_ttl` shortens it), a delete method exists, and `DELETE /v1/user_data` removes data by customer ID (10 of 15). Activity Tracker events record changes to the service's state (10 of 15). Valid security.txt to 6 December 2026, PSIRT and HackerOne, HIPAA readiness on Premium. Certifications weren't read (18 of 20). Total 68.); Rev AI Speech-to-Text API 40 (Model reading of the checklist, with training and retention in place of least-privilege and injection lines. Bearer access tokens, generated and replaced from the account page, with no scopes found (20). The streaming WebSocket takes that long-lived token as an `access_token` query parameter, a documented secret in a URL (minus 10). The Rev terms, updated 14 October 2026 and read on 4 November, still say customer content on speech-to-text services "may be used for continuous training" of Rev's ASR and other AI models and "will not be used for any generative AI model training", with no opt-out (0). Jobs and media are deleted after 30 days, sooner with `delete_after_seconds`, an account setting or a delete call. Streaming retention isn't stated (10). Jobs are listed per account, no audit log found (10). Rev's security page names SOC 2 Type II and links a SOC 3 report, plus PCI, HIPAA on the enterprise tier and CJIS. No security.txt, disclosure policy or bug bounty found (10 of 20). Docs and security page per the 1 and 2 October checks. 10+0+10+10+10 = 40.)
- Schema & documentation, Rev AI Speech-to-Text API +25: IBM Watson Speech to Text 55 (No public OpenAPI or other machine-readable definition was found (0). No llms.txt (0). The reference says which parameters each model family supports and the docs cover each feature (15 of 20). Typed parameters with defaults, ranges and enums (13 of 15). curl and SDK examples on every method, and errors with `error`, `code`, `code_description` and `warnings`, with invalid arguments reported as warnings (12 of 15). Versioned `/v1` paths and dated release notes back to 2015 (15). Total 55.); Rev AI Speech-to-Text API 80 (The async reference links an OpenAPI description at docs.rev.ai/_bundle/api/asynchronous/reference.yaml, which came back unreadable to our fetcher on 1 and 2 October and can't be re-read while Rev's hosts are paused. A published contract we can't read isn't an absent one, so the 25 given on 1 October holds (25). llms.txt (10). Endpoint descriptions state purpose, and the docs explain when to choose the machine, foreign-language or human transcriber (15). Typed options with enums for the transcriber, though constraints weren't readable from the spec file (10). The reference excerpt read shows no error responses for `POST /jobs` (5). Versioned `/speechtotext/v1` paths and a dated changelog (15). Docs per the 1 and 2 October checks, not re-read on 4 November. 25+10+15+10+5+15 = 80.)
- Payments & pricing, IBM Watson Speech to Text +20: IBM Watson Speech to Text 40 (No x402, MPP or L402 (0). Per-minute Plus prices published in the docs without a login (20). The Lite plan gives 500 free minutes a month, and no page read says a card is needed (20). A person creates an IBM Cloud account and service instance in a browser (0). Total 40.); Rev AI Speech-to-Text API 20 (No x402, MPP or L402 (0). Per-hour and per-minute prices published without a login (20). Free credits worth 5 hours of Reverb, but whether sign-up needs a card wasn't confirmed (0). A person signs up in a browser (0). Pricing per the 2 October check, not re-read on 4 November (Rev hosts paused). 0+20+0+0 = 20.)
- Agent ergonomics, IBM Watson Speech to Text +14: IBM Watson Speech to Text 66 (API reading of the checklist. Timestamps, word confidence, alternatives and speaker labels are opt-in (15 of 25). Async jobs and custom models list, and async results can go to a callback URL (12 of 20). Structured errors and warnings an agent can act on (15 of 20). Async jobs take a `user_token`, results have a TTL, and jobs can be deleted, with no idempotency key (12 of 20). Most parameters are optional. Official SDKs including Python, Node and Swift, though the Python and Node SDKs last released in January 2026 (12 of 15). Total 66.); Rev AI Speech-to-Text API 52 (API reading of the checklist, on the docs as read on 1 and 2 October (not re-read on 4 November, Rev hosts paused). Transcripts come back as JSON or plain text by `Accept` header, and captions as SRT or VTT (20). `GET /jobs` pages with `limit` and `starting_after` (20). Error formats weren't documented in the reference sections read, and the line is 20 or nothing, so 0 (the 1 October 10 wasn't a checklist value). No idempotency key. `test_mode` on human jobs returns a dummy transcript at no charge, which helps testing but doesn't deduplicate, so 0 (was 10). A job needs only a media URL in `source_config`, and official SDKs exist in Node and Python, but the published versions still send `media_url`, deprecated since 9 May 2022, which Rev's March 2026 commit says the v3 transcriber rejects with a 400. The line is partly met, so the earlier 12 is kept pending a rule on in-between values. 20+20+0+0+12 = 52.)
- Transparency & trust, IBM Watson Speech to Text +11: IBM Watson Speech to Text 80 (Closed service under the IBM Cloud terms (15). The data security page states default logging for improvement with an opt-out, async retention, GDPR deletion by customer ID and plan-level separation, and they agree with each other. The DPA wasn't read (20 of 30). Previous-generation models carried a dated deprecation of 15 March 2022 and removal on 31 July 2023, and release notes say changes are compatible unless noted (18 of 20). Ten locations are named, with sub-processors not read (12 of 20). Total 65.); Rev AI Speech-to-Text API 69 (Closed service under the Rev.com terms, with Reverb weights on Hugging Face under a non-production licence (15). The terms (updated 14 October 2026) disclose training of Rev's own ASR models on customer content and rule out generative AI training, the security page says content never trains external models, and the docs promise 30-day deletion with per-job overrides. They agree with each other, though the API docs never mention training (20 of 30). Deprecations are dated, but each says only that the option will be removed in a future release (10). EU deployment in Frankfurt documented, no sub-processor list found (10). Security page and docs per the 1 and 2 October checks. 15+20+10+10 = 55.)

| Task | IBM Watson Speech to Text | Rev AI Speech-to-Text API |
| --- | --- | --- |
| Transcribe a one-hour meeting | $0.60 to $1.20 | $0.20 to $119 |