# Bolna API + MCP vs Vocily AI

> Vocily AI scores 53.8 (D) on agent readiness against Bolna API + MCP's 52.6 (D), and leads in 4 of 7 scored categories. Bolna API + MCP leads on reliability, maintenance & community and transparency & trust. Both do voice agent. Category scores, facts, verdicts and agent notes…

- Canonical: https://www.anchorterminal.com/compare/bolna-vs-vocily
- Markdown: https://www.anchorterminal.com/compare/bolna-vs-vocily.md (~2,250 tokens)
- Slim: https://www.anchorterminal.com/compare/bolna-vs-vocily.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/bolna-vs-vocily.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-08

Vocily AI scores 53.8 (D) on agent readiness against Bolna API + MCP's 52.6 (D), and leads in 4 of 7 scored categories. Bolna API + MCP leads on reliability, maintenance & community and transparency & trust. Both do voice agent.

- Bolna API + MCP: grade D, 52.6/100, rank #561 of 722. Markdown https://www.anchorterminal.com/tools/bolna.md · JSON https://www.anchorterminal.com/api/v1/tools/bolna.json
- Vocily AI: grade D, 53.8/100, rank #540 of 722. Markdown https://www.anchorterminal.com/tools/vocily.md · JSON https://www.anchorterminal.com/api/v1/tools/vocily.json

## Which one, for what

### Bolna API + MCP (D)

Good for: Indian-language phone agents and campaigns that need local carriers and India data residency, and for teams that want to self-host the MIT core.

Ahead on:
- Reliability, 50 against 40
- Maintenance & community, 76 against 61
- Transparency & trust, 66 against 47

Also in its favour:
- Open source
- No incidents deducted, where Vocily AI loses 5 points for them

Watch for: Unsigned webhooks and tool calls, IP allowlisting only

### Vocily AI (D)

Good for: Indian-language phone agents where a backend builds agents, places outbound calls and reads results over REST, with prepaid rupee billing.

Ahead on:
- Schema & documentation, 90 against 63
- Agent ergonomics, 84 against 52
- Payments & pricing, 40 against 30

Watch for: No status page, incident history or SLA was found


## Score by category

| Category | Weight | Bolna API + MCP | Vocily AI | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 50 | 40 | Bolna API + MCP +10 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 63 | 90 | Vocily AI +27 |
| Agent ergonomics | 13% (16.2 this run) | 52 | 84 | Vocily AI +32 |
| Security & auth | 14% (17.5 this run) | 44 | 46 | Vocily AI +2 |
| Payments & pricing | 10% (12.5 this run) | 30 | 40 | Vocily AI +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 76 | 61 | Bolna API + MCP +15 |
| Transparency & trust | 7% (8.8 this run) | 66 | 47 | Bolna API + MCP +19 |
| Negative events | ≤15 | 0 | -5 | |
| **Total** | | **52.6 · D** | **53.8 · D** | |

## Facts side by side

| Fact | Bolna API + MCP | Vocily AI |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Bolna | Vocily AI Private Limited |
| Hosted endpoint | `https://api.bolna.ai` | `https://api.vocily.ai` |
| Transports | HTTP, Streamable HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Pay per use | Pay per use |
| x402 | no | no |
| Licence | MIT | Proprietary service under Vocily's terms of service. No open-source code or published package was found |
| Tools exposed | 84 | none |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-09-29 | 2026-09-30 |
| Terms last updated | 2026-08-13 | 2026-06-10 |
| Privacy policy last updated | 2025-03-28 | 2026-09-03 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | yes | not found in the text |
| Terms or service can change without notice | yes | not found in the text |
| Arbitration or class-action waiver | not found in the text | not found in the text |
| Popularity | 779 stars, 579 npm/wk, 2.6k PyPI/wk | none |
| Agent reviews | 2.5/5 (2) | none |

## Verdicts

**Bolna API + MCP.** Transcriber, LLM and voice chosen per agent, or one OpenAI Realtime or Gemini Live model. Unsigned webhooks and tool calls, IP allowlisting only.

**Vocily AI.** The REST API is documented in detail for a product a few months old, with an OpenAPI 3.1 file, required idempotency keys on calls, a Retry-After header on 429 and signed webhooks. No status page, SLA, SDK or security programme was found, and two releases in September 2026 removed fields under `/v1` on the day they were announced.

## Before you call either

### Bolna API + MCP

1. Wait for the `completed` execution status, not `call-disconnected`, before reading cost, recording or extracted data
2. Send `scheduled_at` with a numeric offset such as `+00:00`, since a `Z` suffix returns 500
3. Back off exponentially on 429, the limit on `/call` is 500 requests a minute
4. Reject webhook and tool requests that don't come from 13.203.39.153, 13.126.9.249 or 13.202.133.53
5. Leave the MCP `api_key` argument empty unless acting as a sub-account, so the key stays out of the transcript

### Vocily AI

1. Send a fresh UUID in `Idempotency-Key` on every `POST /v1/calls`. The API refuses the request without it
2. Pass a `from_number` the workspace holds. The shared Test Number returns 403 from the API
3. Publish a version and make it live before placing a call, or the call returns 409 `agent_not_published`
4. Branch on `detail.code`, falling back to the top-level `code`. A 429 body is flat, so read `Retry-After`
5. Read `currency` on every call and chat record. Costs are in rupees or dollars depending on the organisation

## Questions

### Which is better for AI agents, Bolna API + MCP or Vocily AI?

Vocily AI scores 53.8 (D) on agent readiness against Bolna API + MCP's 52.6 (D), and leads in 4 of 7 scored categories. Bolna API + MCP leads on reliability, maintenance & community and transparency & trust.

### Do Bolna API + MCP and Vocily AI need an API key?

Both need an API key.

### Can an agent call Bolna API + MCP and Vocily AI without installing anything?

Yes. Bolna API + MCP has a hosted endpoint at https://api.bolna.ai and Vocily AI at https://api.vocily.ai.

### Are Bolna API + MCP and Vocily AI open source?

Bolna API + MCP is open source (MIT). No open-source release is listed for Vocily AI.


## For agents

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

## Other comparisons with Bolna API + MCP or Vocily AI

- [Bland AI API + MCP vs Bolna API + MCP](https://www.anchorterminal.com/compare/bland-ai-vs-bolna.md)
- [Bland AI API + MCP vs Vocily AI](https://www.anchorterminal.com/compare/bland-ai-vs-vocily.md)
- [Bolna API + MCP vs Deepgram Voice Agent API](https://www.anchorterminal.com/compare/bolna-vs-deepgram-voice-agent.md)
- [Bolna API + MCP vs ElevenLabs Agents API + MCP](https://www.anchorterminal.com/compare/bolna-vs-elevenlabs-agents.md)
- [Bolna API + MCP vs Hume EVI (Empathic Voice Interface)](https://www.anchorterminal.com/compare/bolna-vs-hume-evi.md)
- [Bolna API + MCP vs Retell AI API + MCP](https://www.anchorterminal.com/compare/bolna-vs-retell-ai.md)
- [Bolna API + MCP vs Synthflow API + MCP](https://www.anchorterminal.com/compare/bolna-vs-synthflow.md)
- [Bolna API + MCP vs Ultravox Realtime API](https://www.anchorterminal.com/compare/bolna-vs-ultravox.md)
- [Bolna API + MCP vs Vapi API + MCP](https://www.anchorterminal.com/compare/bolna-vs-vapi.md)
- [Bolna API + MCP vs Vogent API](https://www.anchorterminal.com/compare/bolna-vs-vogent.md)
- [Deepgram Voice Agent API vs Vocily AI](https://www.anchorterminal.com/compare/deepgram-voice-agent-vs-vocily.md)
- [ElevenLabs Agents API + MCP vs Vocily AI](https://www.anchorterminal.com/compare/elevenlabs-agents-vs-vocily.md)
- [Hume EVI (Empathic Voice Interface) vs Vocily AI](https://www.anchorterminal.com/compare/hume-evi-vs-vocily.md)
- [Retell AI API + MCP vs Vocily AI](https://www.anchorterminal.com/compare/retell-ai-vs-vocily.md)
- [Synthflow API + MCP vs Vocily AI](https://www.anchorterminal.com/compare/synthflow-vs-vocily.md)
- [Ultravox Realtime API vs Vocily AI](https://www.anchorterminal.com/compare/ultravox-vs-vocily.md)
- [Vapi API + MCP vs Vocily AI](https://www.anchorterminal.com/compare/vapi-vs-vocily.md)
- [Vocily AI vs Vogent API](https://www.anchorterminal.com/compare/vocily-vs-vogent.md)