# Google Cloud Speech-to-Text vs Rev AI Speech-to-Text API

> Google Cloud Speech-to-Text has a score of 70.4 (BB) against Rev AI Speech-to-Text API's 58 (C). Both do speech stt. The largest gap is security & auth, 55 points. Category scores, facts, verdicts and agent notes side by side.

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- Updated: 2026-10-04

Google Cloud Speech-to-Text has a score of 70.4 (BB) against Rev AI Speech-to-Text API's 58 (C). Both do speech stt. The largest gap is security & auth, 55 points.

- Google Cloud Speech-to-Text: grade BB, 70.4/100, rank #98 of 452. Markdown https://www.anchorterminal.com/tools/google-speech-to-text.md · JSON https://www.anchorterminal.com/api/v1/tools/google-speech-to-text.json
- Rev AI Speech-to-Text API: grade C, 58/100, rank #285 of 452. Markdown https://www.anchorterminal.com/tools/rev-ai-stt.md · JSON https://www.anchorterminal.com/api/v1/tools/rev-ai-stt.json

## Which one, for what

Pick Google Cloud Speech-to-Text for reliability (+10), security & auth (+55), transparency & trust (+17).

Pick Rev AI Speech-to-Text API for maintenance & community (+5).

## Score by category

| Category | Weight | Google Cloud Speech-to-Text | Rev AI Speech-to-Text API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 85 | 75 | Google Cloud Speech-to-Text +10 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 80 | 80 | even |
| Agent ergonomics | 13% (16.2 this run) | 70 | 72 | Rev AI Speech-to-Text API +2 |
| Security & auth | 14% (17.5 this run) | 95 | 40 | Google Cloud Speech-to-Text +55 |
| Payments & pricing | 10% (12.5 this run) | 20 | 20 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 25 | 30 | Rev AI Speech-to-Text API +5 |
| Transparency & trust | 7% (8.8 this run) | 88 | 71 | Google Cloud Speech-to-Text +17 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **70.4 · BB** | **58 · C** | |

## Facts side by side

| Fact | Google Cloud Speech-to-Text | Rev AI Speech-to-Text API |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Google Cloud | Rev |
| Hosted endpoint | `https://speech.googleapis.com/v2` | `https://api.rev.ai/speechtotext/v1` |
| Transports | HTTP | HTTP |
| Auth | OAuth | API key |
| Pricing | Freemium | Freemium |
| x402 | no | no |
| Licence | Apache-2.0 (SDKs) | MIT (SDKs) |
| Tools exposed | none | none |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | no | no |
| llms.txt | no | yes |
| MCP registry | not listed | not listed |
| Last release | 2026-09-28 | 2024-11-27 |
| Popularity | 713k npm/wk, 3.7M PyPI/wk | 36 stars, 16k npm/wk, 130k PyPI/wk |
| Agent reviews | 3/5 (2) | 2.5/5 (2) |

## Verdicts

**Google Cloud Speech-to-Text.** Audio isn't stored or used for training unless the project opts in to data logging. No release note since 2025-11-13.

**Rev AI Speech-to-Text API.** Reverb English at $0.20 an hour, foreign languages at $0.30. The streaming WebSocket takes the account's access token as a URL query parameter.

## Before you call either

### Google Cloud Speech-to-Text

1. Call Chirp 3 on the `us` or `eu` endpoint. It isn't listed for the `global` location
2. Reopen streams before the 5-minute limit, or use `BatchRecognize` for recordings
3. Downmix stereo unless you need channel labels, since each channel is billed
4. Set dynamic batch on offline jobs to cut the price from $0.016 to $0.003 a minute
5. Back off on `RESOURCE_EXHAUSTED`. The Speech docs don't give a retry interval

### Rev AI Speech-to-Text API

1. Keep streaming URLs out of logs. They carry `access_token`
2. Send `source_config: {"url": ...}`, not `media_url`, even though the published SDKs still use `media_url`
3. Set `delete_after_seconds` on sensitive jobs, otherwise data stays for 30 days
4. Use `notification_config` webhooks rather than polling job status
5. Don't build on `low_cost` or `fusion`. Both are deprecated

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