# Buttondown

Buttondown (buttondown.com): subprocessors, data processing agreement, security documents and changes, as monitored by Third Party Index.

- Page: https://thirdpartyindex.com/vendors/buttondown
- Documents last verified: 2026-10-05
- Transparency rating: 74/100 (how much it publishes, not how secure it is): Subprocessor list 30/30; Processing locations 0/8 (partial); Purposes 7/7; Data processing addendum 12/12; Trust center 0/8 (not found); Privacy policy 6/6; security.txt 6/6; Security page 0/5 (not found); Status page 5/5; Vulnerability disclosure 0/5 (not found); Pages still reachable 8/8
- Supply chain: relies on 11 tracked vendors directly, 128 within two hops, 381 within three; 1 tracked vendors rely on it directly, 1 within two hops, 1 within three
- Cite as: Buttondown, Third Party Index, https://thirdpartyindex.com/vendors/buttondown (data CC BY 4.0)

## Documents

| Document | URL | Last verified | Last changed |
|---|---|---|---|
| Subprocessor list | https://buttondown.com/legal/subprocessors | 2026-10-05 | 2026-10-05 |
| Data processing addendum | https://buttondown.com/legal/data-processing-agreement | 2026-10-05 | 2026-10-05 |
| Privacy policy | https://buttondown.com/legal/privacy | 2026-10-05 | 2026-10-05 |
| Terms | https://buttondown.com/legal/terms | 2026-10-05 | 2026-10-05 |
| security.txt | https://buttondown.com/.well-known/security.txt | 2026-10-05 | 2026-10-05 |
| Status page | https://status.buttondown.com/ | 2026-10-05 | 2026-10-05 |

## Subprocessors (12)

As its own list states them.

| Subprocessor | Purpose | Location | Listed since |
|---|---|---|---|
| [Amazon Web Services](https://thirdpartyindex.com/vendors/amazon-web-services.md) | Application hosting and cloud infrastructure | — | 2026-10-05 |
| [Cloudflare](https://thirdpartyindex.com/vendors/cloudflare.md) | Content delivery network and security services | — | 2026-10-05 |
| [Google Workspace](https://thirdpartyindex.com/vendors/google-cloud.md) | Business productivity and collaboration tools | — | 2026-10-05 |
| [Heroku](https://thirdpartyindex.com/vendors/salesforce.md) | Legacy domain ingress and TLS termination | — | 2026-10-05 |
| [Mailgun](https://thirdpartyindex.com/vendors/mailgun.md) | Email delivery and transactional email services | — | 2026-10-05 |
| [Plain](https://thirdpartyindex.com/vendors/plain.md) | Customer support and help desk software | — | 2026-10-05 |
| [Postmark](https://thirdpartyindex.com/vendors/postmark.md) | Email delivery and transactional email services | — | 2026-10-05 |
| Seline | Privacy-focused website analytics | — | 2026-10-05 |
| [Sentry](https://thirdpartyindex.com/vendors/sentry.md) | Error monitoring and performance tracking | — | 2026-10-05 |
| [Slack](https://thirdpartyindex.com/vendors/slack.md) | Internal communication and support tools | — | 2026-10-05 |
| [Stripe](https://thirdpartyindex.com/vendors/stripe.md) | Payment processing and billing | — | 2026-10-05 |
| [Twilio](https://thirdpartyindex.com/vendors/twilio.md) | Communication APIs and messaging services | — | 2026-10-05 |

Read from ([evidence](https://thirdpartyindex.com/evidence/49421)). CSV: https://thirdpartyindex.com/vendors/buttondown/subprocessors.csv

## Subprocessor of (1)

Tracked vendors whose own subprocessor lists name it, and what they say they use it for.

- [Fibery](https://thirdpartyindex.com/vendors/fibery.md): Sending and managing our email newsletter to subscribers

## Security contact

From its security.txt (https://buttondown.com/.well-known/security.txt) ([evidence](https://thirdpartyindex.com/evidence/49420)):

- Contact: mailto:support@buttondown.com
- Disclosure policy: https://buttondown.com/blog/security
- Languages: en
- Valid until 2027-10-05

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Third Party Index (https://thirdpartyindex.com) monitors vendors' public security and privacy documents and keeps each version as evidence. Data CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/); vendors' own documents are theirs. API: https://thirdpartyindex.com/api