# Dropbox Sign vs airSlate SignNow

> Dropbox Sign and airSlate SignNow score within a point of each other on agent readiness, 68.9 (B) and 68.5 (B). airSlate SignNow leads on reliability, payments & pricing and transparency & trust. Both do esign send. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/dropbox-sign-vs-signnow
- Markdown: https://www.anchorterminal.com/compare/dropbox-sign-vs-signnow.md (~2,100 tokens)
- Slim: https://www.anchorterminal.com/compare/dropbox-sign-vs-signnow.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/dropbox-sign-vs-signnow.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

Dropbox Sign and airSlate SignNow score within a point of each other on agent readiness, 68.9 (B) and 68.5 (B). airSlate SignNow leads on reliability, payments & pricing and transparency & trust. Both do esign send.

- Dropbox Sign: grade B, 68.9/100, rank #161 of 629. Markdown https://www.anchorterminal.com/tools/dropbox-sign.md · JSON https://www.anchorterminal.com/api/v1/tools/dropbox-sign.json
- airSlate SignNow: grade B, 68.5/100, rank #168 of 629. Markdown https://www.anchorterminal.com/tools/signnow.md · JSON https://www.anchorterminal.com/api/v1/tools/signnow.json

## Which one, for what

### Dropbox Sign (B)

Good for: An agent that sends a prepared PDF or a saved template for signature from one company account and tracks it to completion by webhook or polling, with the signed PDF and audit trail at the end.

Ahead on:
- Schema & documentation, 88 against 81
- Agent ergonomics, 72 against 66
- Maintenance & community, 85 against 72

Watch for: No idempotency keys found in the docs or the spec, so a retried send can create a second signature request

### airSlate SignNow (B)

Good for: An agent that sends agreements from templates, embeds signing in another product or tracks invites, and teams that want per-invite pricing with a free test mode.

Ahead on:
- Reliability, 93 against 75
- Payments & pricing, 35 against 25
- Transparency & trust, 74 against 68

Also in its favour:
- Runs on your own machine

Watch for: API keys don't expire and work for all API requests. Narrower access needs an OAuth token requested with a URL-pattern scope


## Score by category

| Category | Weight | Dropbox Sign | airSlate SignNow | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 75 | 93 | airSlate SignNow +18 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 88 | 81 | Dropbox Sign +7 |
| Agent ergonomics | 13% (16.2 this run) | 72 | 66 | Dropbox Sign +6 |
| Security & auth | 14% (17.5 this run) | 65 | 62 | Dropbox Sign +3 |
| Payments & pricing | 10% (12.5 this run) | 25 | 35 | airSlate SignNow +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 85 | 72 | Dropbox Sign +13 |
| Transparency & trust | 7% (8.8 this run) | 68 | 74 | airSlate SignNow +6 |
| Negative events | ≤15 | 0 | -2 | |
| **Total** | | **68.9 · B** | **68.5 · B** | |

## Facts side by side

| Fact | Dropbox Sign | airSlate SignNow |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Dropbox, Inc. | airSlate, Inc. |
| Hosted endpoint | `https://api.hellosign.com/v3` | `https://api.signnow.com` |
| Transports | HTTP | HTTP, Streamable HTTP, stdio |
| Auth | OAuth or key | OAuth or key |
| Pricing | Paid | Pay per use |
| x402 | no | no |
| Licence | Proprietary service under the Dropbox Sign terms of service. The OpenAPI spec repository is Apache 2.0 and the official SDKs are MIT | Proprietary service under the SignNow Terms of Service. The MCP server and the SDKs on GitHub are MIT |
| Tools exposed | none | 21 |
| Read-only variant documented | no | yes |
| llms.txt | yes | yes |
| MCP registry | not listed | `io.github.signnow/sn-mcp-server` |
| Last release | 2026-09-10 | 2026-09-03 |
| Terms last updated | 2025-01-07 | 2023-03-02 |
| Privacy policy last updated | 2025-01-14 | 2026-08-12 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | yes |
| Terms restrict benchmarking | yes | yes |
| Terms or service can change without notice | yes | not found in the text |
| Arbitration or class-action waiver | yes | yes |
| Popularity | 22 stars, 150k npm/wk | 8 stars, 7.7k npm/wk, 5.3k PyPI/wk |

## Verdicts

**Dropbox Sign.** A public OpenAPI 3.0.3 spec, llms.txt, six official SDKs and a free test mode let an agent build the whole flow before paying. Production sends need a paid plan from $900 a year, the API key has full account access, and no idempotency keys were found in the reviewed documentation.

**airSlate SignNow.** The REST API has a public OpenAPI 3.0 spec with 354 operations, Markdown docs, a free Development mode with 500 invites and a hosted MCP server with OAuth. API keys don't expire and carry full account access, no idempotency keys were found, and the MCP server's GitHub repository was archived when checked on 7 October 2026.

## Before you call either

### Dropbox Sign

1. Send `test_mode=true` while building. Test requests are free, watermarked and not legally binding, and are limited to 10 requests a minute
2. Don't blind-retry a send after a timeout. No idempotency key exists, so list requests by `metadata` or title first to check whether it was created
3. Authenticate with HTTP Basic, the API key as username and an empty password. Keep the key out of URLs, although the docs show that form
4. Answer every webhook with HTTP 200 and the body `Hello API Event Received`, and verify `event_hash`. Ten consecutive failures clear the callback URL
5. Treat a 200 from cancel as queued only. Confirmation arrives later as a `signature_request_canceled` event

### airSlate SignNow

1. Call https://api.signnow.com with `Authorization: Bearer <API key or access token>`. Development and Live share this host, and Development documents carry a watermark
2. Request OAuth tokens with a narrow `scope` such as `document/* GET/user`. The default `*` grants every API action
3. Read `X-RateLimit-Remaining` and `X-RateLimit-Reset` on each response. The limit is 500 requests an hour in Development and 1,000 in Live, and 429 has no Retry-After
4. Check invite status before resending. No idempotency key exists, and a repeated invite call counts as another charged invite
5. Set `secret_key` when creating an event subscription and verify `X-SignNow-Signature` (HMAC SHA-256 of the body) on every callback

## Questions

### Which is better for AI agents, Dropbox Sign or airSlate SignNow?

Dropbox Sign and airSlate SignNow score within a point of each other on agent readiness, 68.9 (B) and 68.5 (B). airSlate SignNow leads on reliability, payments & pricing and transparency & trust.

### Do Dropbox Sign and airSlate SignNow need an API key?

Both take an API key or an OAuth sign-in.

### Can an agent call Dropbox Sign and airSlate SignNow without installing anything?

Yes. Dropbox Sign has a hosted endpoint at https://api.hellosign.com/v3 and airSlate SignNow at https://api.signnow.com.


## For agents

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

## Other comparisons with Dropbox Sign or airSlate SignNow

- [Documenso vs Dropbox Sign](https://www.anchorterminal.com/compare/documenso-vs-dropbox-sign.md)
- [Documenso vs airSlate SignNow](https://www.anchorterminal.com/compare/documenso-vs-signnow.md)
- [Docusign vs Dropbox Sign](https://www.anchorterminal.com/compare/docusign-vs-dropbox-sign.md)
- [Docusign vs airSlate SignNow](https://www.anchorterminal.com/compare/docusign-vs-signnow.md)
- [Dropbox Sign vs PandaDoc](https://www.anchorterminal.com/compare/dropbox-sign-vs-pandadoc.md)
- [PandaDoc vs airSlate SignNow](https://www.anchorterminal.com/compare/pandadoc-vs-signnow.md)