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

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

Kalender Sync

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.

Tanay Gondil

Free

Free macOS workspace that unites a terminal, a real Chromium browser, and Claude Code in one hot-reloadable, self-building window.

Self-Building Workspace: ⌘K invokes Claude Code on tterm's own source and hot-reloads the running app so you can extend the tool from inside itself.
Row-Per-Project Layout: Every project gets its own row containing an explorer, a Claude Code session, and a file viewer, so multiple projects stack side by side.
Embedded Real Browser: ⌘B opens a Chromium tab inside tterm that inherits your Chrome cookies, bookmarks, and history — favicons and all.
Diff-Only Review: ⌘G opens a hunk-level diff reviewer for staging and committing changes; there's no editor by design, so you review instead of retype.
Command-Palette Shortcuts: ⌘K palette, ⌘O projects, ⌘P quick open, ⌘⇧F search, ⌘F find, ⌘⇧M for CLAUDE.md, and more make navigation keyboard-first.
Terminal-Respecting Key Handling: Only ⌘-chords are intercepted by tterm; every ⌃-key passes through to the pty untouched, so terminal apps keep working.
Privacy by Default: No account, no telemetry, and no network calls home — the app is a single ad-hoc-signed hobby build.

AI-Paired Coding: Keep Claude Code, your terminal, and docs in one window while pairing with an LLM on a project.
Multi-Project Juggling: Stack several concurrent projects as rows so you can jump between them without alt-tabbing.
Doc-Grounded Development: Use the embedded browser to keep API docs open next to your terminal and diff without leaving the app.
Focused Diff Review: Review and stage AI-generated changes hunk by hunk before committing, rather than editing in place.
Hobbyist macOS Tinkering: Extend the tool itself from inside via Claude Code, treating tterm as a live playground.