Side by side
Dropbox Sign API vs OpenSign
Both stand on digital signature api software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan AndroidAPIiPhone+1
Dropbox Sign API combines embedded signature flows, reusable templates, and SDKs for six languages. The free options have request limits, and higher monthly volume requires a sales contact.
Visit Dropbox Sign API
Free plan Open source APILinuxMac+3
Choose OpenSign if you need a free PDF signing plan, reusable templates, or self-hosting options. Look elsewhere if your free workflow depends on bulk sending, public links, or live API tokens, since those require paid plans.
Visit OpenSignThe facts
| Dropbox Sign API | OpenSign | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Yes |
| Runs on | Android, API, iPhone, Web | API, Linux, Mac, Self-hosted, Web, Windows |
| Lowest paid plan | Essentials: $75 a month | Professional: $9.99 a month |
| Plans published | 5 | 4 |
| Maker | Not published | Not published |
| Website | sign.dropbox.com | opensignlabs.com |
| On digital signature api software | #3 of 28 | #1 of 28 |
Dropbox Sign API: what it does well
- Embedded workflows can run inside websites using iFrames
- Reusable templates can include preloaded data
- Official SDKs cover six programming languages
- Audit trails timestamp document actions
- Free package includes up to 3 requests/month
What to know first
- Essentials starts at $75/mo, billed annually as $900 USD
- More than 500 monthly requests requires contacting sales
- Free package is limited to 3 requests/month
OpenSign: what it does well
- Free plan includes unlimited digital signatures and templates.
- Templates support pre-placed widgets and reusable documents.
- Supports two-factor authentication and passkey sign-in.
- Offers Docker self-hosting instructions for Linux, macOS, and Windows.
- Sandbox API tokens are available on every plan.
What to know first
- Free users can send up to 15 invitation emails per month.
- Bulk sending and public links require a paid plan.
- Live API tokens require Professional or Teams.
- Some SMTP features are limited to paid plans.
Alternatives to Dropbox Sign API Alternatives to OpenSign The whole list