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Insomnia vs zSign
Insomnia is an API client for testing; it does not offer e-signature functionality.
InsomniaOpen-source API client for REST, GraphQL and gRPC
zSignSend documents to sign with your fav AI agentWhich to pick
Pick Insomnia if you want…
- Collaborative AI-native API testing
- API testing and debugging
- Open-source code (Kong/insomnia on GitHub, Apache-2.0 license)
- Integrations with Kong Konnect, OIDC or SAML (on Insomnia's list, not zSign's)
Pick zSign if you want…
- Pay-per-envelope e-signatures
- Integrations with REST API, Zapier or MCP server (on zSign's list, not Insomnia's)
Side by side
- What it is
- Insomnia:Insomnia is an open-source API client for designing, testing, debugging and mocking REST, GraphQL, gRPC, SOAP and WebSocket APIs.
- zSign:zSign provides legally binding e-signatures via a pay-per-envelope model, usable from a dashboard, API, Zapier or AI agents.
- Best for
- Insomnia:Collaborative AI-native API testing
- zSign:Pay-per-envelope e-signatures
- Who it’s for
- Insomnia:API developers, security-focused teams, and organizations needing collaborative API workflows.
- zSign:Developers and teams building apps or AI agents that need automated e-signatures.
- Pricing
- Insomnia:Freemium
- zSign:Freemium
- Plans
- Insomnia:—
- zSign:Starter $27 per pack · Growth $87 per pack · Scale $297 per pack · White-label $49 per month
- Open source
- Insomnia:Yes, 40,038 GitHub stars
- zSign:—
- Works with
- Insomnia:Kong Konnect, OIDC, SAML, SCIM, Inso CLI
- zSign:REST API, Zapier, MCP server, Claude, Cursor
Insomnia features
- Design-first API editor. Create and preview OpenAPI specs in real time with live linting.
- Native API mocking. Generate dynamic mock responses from collections, specs or plain language.
- Automated testing at scale. Run unlimited collection tests with pre/post scripts and CI/CD integration via Inso CLI.
- Kong Konnect integration. Sync API catalog directly with Kong Konnect for up-to-date endpoint discovery.
- Collaboration & RBAC. Real-time project sharing, role-based access controls and unlimited collaborators per project.
- Flexible storage options. Store data locally, in Git, in the cloud, or hybrid with end-to-end encryption.
- Enterprise identity & security. SSO via OIDC/SAML, SCIM provisioning, SOC 2 compliance and enterprise SLAs.
- MCP client support. Test and debug MCP servers with AI-powered workflows.
zSign features
- No per-seat pricing. Pay only for envelopes sent; add unlimited teammates at no extra cost.
- Multi-channel sending. Send envelopes from the dashboard, Zapier, REST API or the MCP server.
- AI-agent ready. Agents can generate PDFs with placeholder tags and send them via API or MCP.
- Tamper-evident audit trail. Each view and signature is logged with IP, timestamp and SHA-256 document hash.
- White-label branding. Remove the zSign badge, use your own domain and email for signing pages.
- Template links. Create reusable signing links without writing code.
Insomnia vs zSign FAQ
Is Insomnia or zSign free?+
Insomnia has a free plan and paid plans. zSign has a free plan; paid plans start at $49/month (White-label).
Is Insomnia or zSign open source?+
Insomnia is open source (Kong/insomnia on GitHub, Apache-2.0 license). DevHunt has no public source repository on record for zSign.
Do Insomnia and zSign integrate with the same tools?+
Their integration lists don't overlap: Insomnia lists Kong Konnect, OIDC, SAML, SCIM and 1 more; zSign lists REST API, Zapier, MCP server, Claude and 1 more.
On DevHunt
Based on each tool's website and DevHunt data. Details may change; check the official sites.