# E-signature: which signature services coding agents choose

> Dropbox Sign and DocuSign split the top, about 30% and about 29%.

Source: https://armature.tech/leaderboards/e-signature (Armature agent leaderboards). 106 runs, 9 apps, 3 agents, 3 personas, updated 2026-09-16. Interactive board with every run: https://armature.tech/leaderboards#app/e-signature

## Key learnings

We asked three agents to add e-signature to 9 codebases, 106 runs in all, in different wordings and as three different people. The two leaders finished one win apart. In 11 runs the agents named no product and wrote it themselves.

### The same question did not hold one answer (17 of 27)

Each agent got asked more than one way inside each codebase. In 17 of those 27 groups of runs, the picks didn't all match.

### Each agent went its own way (14 of 35)

Codex picked Dropbox Sign 14 times in 35 runs. Claude Code split evenly between the two leaders, 11 wins each. For Cursor, the runner-up was YouTrust with seven.

### Some products won in one codebase only (5 of 5)

Signable took all five of its wins in the lettings agency codebase. Documenso won three times and Namirial twice, both in the EU fintech ledger with residency rules written down. Adobe Acrobat Sign won three times, all in the .NET supplier onboarding platform.

### Named in many runs, chosen in few (60 mentions)

Adobe Acrobat Sign came up in 82 runs and won three of them. PandaDoc came up in 60 runs and won none.

Smaller learnings:

- The simulated user approved the plan in all 106 runs, but sent the agent back at least once in 94 of them.
- In one run it refused to approve until the agent named a specific product.
- With junior developers asking, DocuSign won 18 times and Microsoft 365 eSignature came second with nine.

## The ranking

| # | Product | Wins | Share |
|---|---|---:|---:|
| 1 | Dropbox Sign (sign.dropbox.com) | 32 | 30% |
| 2 | DocuSign (docusign.com) | 31 | 29% |
| 3 | Built in-house (outcome) | 11 | 10% |
| 4 | Microsoft 365 eSignature (microsoft.com) | 9 | 8% |
| 5 | YouTrust (youtrust.com) | 9 | 8% |
| 6 | Signable (signable.co.uk) | 5 | 5% |
| 7 | Adobe Acrobat Sign (adobe.com) | 3 | 3% |
| 8 | Documenso (documenso.com) | 3 | 3% |
| 9 | Namirial (namirial.com) | 2 | 2% |
| 10 | SignWell (signwell.com) | 1 | 1% |

## By agent

- Cursor (Grok 4.6): 36 runs, first DocuSign (9), then YouTrust (7)
- Claude Code (Claude Opus 5): 35 runs, first DocuSign (11), then Dropbox Sign (11)
- Codex (GPT-5.6 Sol): 35 runs, first Dropbox Sign (14), then DocuSign (11)

## By persona

- Junior developer: 58 runs, first DocuSign (18), then Microsoft 365 eSignature (9)
- Enterprise team: 24 runs, first Dropbox Sign (10), then YouTrust (4)
- Senior engineer: 24 runs, first Dropbox Sign (13), then DocuSign (10)

## By what the ask stressed

- The plain ask: 88 runs, first DocuSign (28), then Dropbox Sign (24)

A case is one codebase with one agent, asked several times in different words and as different people. 17 of 27 cases did not hold to a single choice.

## How this was measured

Every number on this page comes from a controlled experiment. We took 9 small applications, asked 3 coding agents (Cursor (Grok 4.6), Claude Code (Claude Opus 5), Codex (GPT-5.6 Sol)) to add e-signature to each of them, in several wordings and as a junior developer and enterprise team and senior engineer, and let the agent choose the product. Each run happened in a sandbox with the agent at a pinned version, and a judge read the session to record what was chosen. That is 106 runs. The interactive board shows every run with its session, its diff and the judge's verdict. A simulated user stood in for the owner of the codebase: it read the agent's plan and had to approve it before any code was written; it sent the agent back at least once in 94 runs.

Methodology and publications: https://armature.tech/publications

If you sell in this sector, what these numbers mean for a vendor: https://armature.tech/library/e-signature-coding-agents-playbook (Markdown: https://armature.tech/library/e-signature-coding-agents-playbook.md)

## Other sectors

- [Agent sandboxes](https://armature.tech/leaderboards/sandboxes) (https://armature.tech/leaderboards/sandboxes.md)
- [Observability](https://armature.tech/leaderboards/observability) (https://armature.tech/leaderboards/observability.md)
- [AI SRE](https://armature.tech/leaderboards/ai-sre) (https://armature.tech/leaderboards/ai-sre.md)
- [Payments](https://armature.tech/leaderboards/payments) (https://armature.tech/leaderboards/payments.md)
- [Deploy](https://armature.tech/leaderboards/deploy) (https://armature.tech/leaderboards/deploy.md)
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- [Email providers](https://armature.tech/leaderboards/mail) (https://armature.tech/leaderboards/mail.md)
- [Product analytics](https://armature.tech/leaderboards/product-analytics) (https://armature.tech/leaderboards/product-analytics.md)
- [Databases](https://armature.tech/leaderboards/databases) (https://armature.tech/leaderboards/databases.md)
- [File storage](https://armature.tech/leaderboards/storage) (https://armature.tech/leaderboards/storage.md)
- [LLM evals & observability](https://armature.tech/leaderboards/evals) (https://armature.tech/leaderboards/evals.md)
- [Voice Agents](https://armature.tech/leaderboards/voice-agents) (https://armature.tech/leaderboards/voice-agents.md)
- [Serverless functions](https://armature.tech/leaderboards/serverless) (https://armature.tech/leaderboards/serverless.md)
- [Cloud](https://armature.tech/leaderboards/cloud) (https://armature.tech/leaderboards/cloud.md)
- [AI gateway](https://armature.tech/leaderboards/ai-gateway) (https://armature.tech/leaderboards/ai-gateway.md)
- [Bot protection](https://armature.tech/leaderboards/bot-protection) (https://armature.tech/leaderboards/bot-protection.md)
- [Search](https://armature.tech/leaderboards/search) (https://armature.tech/leaderboards/search.md)
- [Agent frameworks](https://armature.tech/leaderboards/agent-frameworks) (https://armature.tech/leaderboards/agent-frameworks.md)
- [Performance in CI](https://armature.tech/leaderboards/perf-ci) (https://armature.tech/leaderboards/perf-ci.md)
- [Document processing & OCR](https://armature.tech/leaderboards/document-processing) (https://armature.tech/leaderboards/document-processing.md)
- [Usage-based billing](https://armature.tech/leaderboards/usage-based-billing) (https://armature.tech/leaderboards/usage-based-billing.md)
- [Code review](https://armature.tech/leaderboards/code-review) (https://armature.tech/leaderboards/code-review.md)
- [Internationalization](https://armature.tech/leaderboards/internationalization) (https://armature.tech/leaderboards/internationalization.md)
- [Message queues](https://armature.tech/leaderboards/message-queues) (https://armature.tech/leaderboards/message-queues.md)
- [Maps](https://armature.tech/leaderboards/maps) (https://armature.tech/leaderboards/maps.md)
- [AI search](https://armature.tech/leaderboards/ai-search) (https://armature.tech/leaderboards/ai-search.md)
- [In-app chat & calls](https://armature.tech/leaderboards/in-app-communication) (https://armature.tech/leaderboards/in-app-communication.md)
- [Vector search](https://armature.tech/leaderboards/vector-search) (https://armature.tech/leaderboards/vector-search.md)