A Free Sandbox eSign API Before Production Built for Developers
Don't find bugs after you go live. Use a DocuSeal sandbox that replicates production perfectly. No 14-day document deletion. No credit card required. Just code.
Why Test Your Free Sandbox eSign API Before Production on Opsily?
Enterprise-grade infrastructure without the complexity
True Production Parity
DocuSign sandboxes often have feature gaps compared to paid tiers. DocuSeal on Opsily gives you the full API feature set in test mode.
Unlimited Testing
Most SaaS providers limit you to 3 documents or 100 envelopes per year. Our DocuSeal managed hosting allows unlimited sandbox requests.
No Vendor Lock-in
Avoid the $5,000 yearly minimums. Start with a free sandbox and transition to a $0.20 per completion production model.
Built for teams who need reliability
Trusted by fast-moving teams
Go from Sandbox to Production in 4 Steps
Choose Your App
Select an app to get started.
Deploy Instantly
Select DocuSeal in the Opsily dashboard. Your private instance is ready in under 2 minutes.
Enable Test Mode
Toggle the 'Test Mode' flag in your API requests to simulate signing flows.
Integrate & Test
Use the REST API or SDKs to embed signing into your app. Configure webhooks.
Flip the Switch
Once verified, change your API key to production. Scale your volume easily.
EUR 800 a year for tools that used to cost us multiples of that. We replaced HubSpot, Make.com, and our password manager with self-hosted apps on Opsily. One provider, one fee.
Franz Koller
Co-Founder · Joy
Developer Sandbox Comparison
Compare sandbox limits and production costs across major e-signature API providers.
Zero-Risk Pricing
Choose the server that fits your needs. All plans include GDPR-compliant German hosting.
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Need more resources or custom solutions?
Enterprise Security Without the Enterprise Price
eIDAS Compliant
Standard Electronic Signatures (SES) compliant with EU regulations.
GDPR Ready
Full data sovereignty with EU-based infrastructure in Dublin.
Open Source
AGPL-3.0 Licensed core ensures no vendor lock-in.
Secure Infrastructure
Managed SSL certificates and daily encrypted backups included.
What our customers say
Teams across the EU run their stack on Opsily. Here is what that looks like in practice.
EUR 800 a year for tools that used to cost us multiples of that. We replaced HubSpot, Make.com, and our password manager with self-hosted apps on Opsily. One provider, one fee.
Franz Koller
Co-Founder • Joy
We were paying per user on everything and it added up fast. Now we run five apps for less than one of those old plans. My finance team finally stopped asking questions.
Elise
Head of Operations
Wanted to use n8n for ages but the self-host part always stopped me. Opsily just handled it. Got the power without becoming an IT person overnight.
Federica B.
Automation Consultant
Frequently Asked Questions
Yes. DocuSeal includes a built-in 'Test Mode' that is available to all users. When you host DocuSeal on Opsily, you can use this mode to test unlimited document templates, signing flows, and API integrations without incurring per-document costs. This is the ideal way to verify your code before moving to production.