Elva vs Kalender Sync: Features, Pricing & Which Is Better (2026)

A side-by-side comparison of Elva and Kalender Sync — features, pricing, and ideal use cases — to help you decide which AI tool fits your workflow.

Elva

Theneo

Freemium

Reads your repositories to discover every API, scores and governs them, then exposes them to developers and AI agents via hosted MCP servers.

Spec-Free API Discovery: Elva scans repository code directly to find endpoints and generates OpenAPI 3.1 as output, so no existing spec is needed to start.
Endpoint Scoring: Every collection is graded on design, developer experience, AI readiness, security and performance, with the weakest collection surfaced first.
AI Fix Pass: A one-click agent writes missing descriptions from code, types response schemas and documents auth, then rescores the collection.
API Contracts: Per-audience contracts pin the exact endpoints and fields a partner, internal team, public developer or MCP client receives, excluding PII and internal fields.
Breaking Change Enforcement: Each commit is diffed against published contracts, showing the schema diff, affected consumers and tools, and blocking publish by policy.
Hosted MCP Servers: Contracts generate MCP servers hosted behind Elva's gateway with OAuth2, scoped keys, per-tool authorization and exportable call logs.
MCP Playground and Agent Feedback: Test the server with a live model, then read the complaints agents file about confusing or failing tools, scored back into the catalog.
Multi-Target Publishing: One approved contract ships as OpenAPI spec, Theneo docs, MCP server, Postman collection and a typed TypeScript SDK in sync.

API Inventory Audit: Discover undocumented or forgotten endpoints across a large codebase and get a ranked list of what to fix first.
Agent Enablement: Expose an internal service to Claude, Cursor or ChatGPT as a governed MCP server instead of hand-writing tool wrappers.
Partner Integration Safety: Publish a restricted contract to an external partner and have Elva block commits that would break their integration.
PII Scoping: Keep customer emails and internal ops annotations out of a public or agent-facing surface while the same endpoints serve them internally.
Zombie Endpoint Retirement: Prove no active consumer references an endpoint before deleting it, using contract and call-log evidence.
Enterprise Security Review: Satisfy SOC 2, ISO 27001 and GDPR questions and wire agent access into an existing SSO and SCIM identity provider.
Documentation Drift Control: Keep docs, SDKs and Postman collections regenerated from code on every merge instead of maintained by hand.

PPJ Venture Labs UG

Freemium

GDPR-compliant calendar sync that links Outlook, Google, iCloud and more, and lets Claude, ChatGPT or other agents manage your calendars via MCP.

Multi-Provider Calendar Sync: Connects Outlook, Google, Apple iCloud, GMX, WEB.DE, mailbox.org, kSuite, Posteo and STRATO calendars in real time, one-way or two-way.
Visibility Levels: Choose per sync whether the target sees busy only, title and time, or full event details.
AI Assistant Access via MCP: Remote MCP server lets Claude, ChatGPT, Codex, Cursor, Grok and OpenClaw read and manage your calendars.
Agent-Driven Setup: Ask your connected AI agent to create syncs, find free time across calendars and schedule events.
Per-Calendar Permissions: Grant AI access calendar by calendar, with optional write access and an access log.
Calendar Sharing: Share a calendar with another person without exposing the underlying account.
Credit-Based AI Usage: Monthly AI credits cover event searches, availability checks and event edits, with optional top-ups.
GDPR Compliance: Hosted in Germany with data-protection-focused design.

A freelancer mirrors client calendars into one personal calendar while hiding event details behind busy blocks.
A manager with several roles keeps Outlook, Google and iCloud calendars synchronized to avoid double bookings.
A tax advisor lets Claude find free slots across work and private calendars and book appointments.
A coach shares availability with clients without giving access to the full calendar.
A developer connects Claude Code or Cursor to their calendar through MCP to plan the week.
An interim manager with multiple companies consolidates every company calendar into a single view.