Native Flutter Gantt Widget vs. Web-View Wrappers
Traditional client-server architectures struggle with high-latency environments and unstable connections. Even worse, many "Flutter" solutions are just Web-View Wrappers that suffer from browser lag and poor touch response.
GanttSync is the high-performance backend for the legacy_gantt_chart Flutter package. It provides a robust, offline-first synchronization layer that ensures your chart state remains consistent across all devices, with 120 FPS native performance and zero browser bloat.
Why pay for Gantt UI? How GanttSync is disrupting the 'Pro' paywall.
Unlike our competitors who hide "Pro" UI features behind paywalls (monetizing basic features like dependencies or timelines), we believe the industry-standard Gantt interface should be a free commodity for every developer. We make our money by solving the hardest problem: Real-time, offline-first synchronization.
We Don't Gate Pixels. Every visualization tool we build, from standard Gantt timelines to advanced PERT network diagrams, is released as FOSS. We monetize the Engine, not the Buttons. If you need real-time, offline-first collaboration for an enterprise team, we provide the industrial-strength backend to power your free UI.
Comparison: GanttSync vs. The "Big Names"
| Feature | GanttSync Ecosystem | The "Big Names" |
|---|---|---|
| Availability | ✅ Live & Production Ready | ❌ Early Access / Waitlists |
| Offline-First | ✅ Native CRDT/HLC Engine | ❌ Web-based / "Sync on reconnect" |
| Architecture | ✅ Native Flutter (Dart) | ❌ JavaScript Wrappers (Web-View lag) |
| Gantt UI | ✅ 100% Free & Open Source | ❌ Gated behind "Pro" paywalls |
| PERT/Network UI | ✅ 100% Free & Open Source | ❌ High-tier Enterprise only |
| CPM Math Engine | ✅ Included in Core | ❌ Build it yourself |
| Multi-View Support | ✅ Native (Unlimited widgets per page) | ❌ Marketed as a "Pro" feature |
| Sync Engine | ✅ Available Today | ❌ Build it yourself |
| Pricing | ✅ Monetize the Backend | ❌ Monetize the UI library |
| Sync Transparency | ✅ Real-time tooltips & clear status | ❌ Ambiguous icons |
| Theme Support | ✅ Native Dark/Light Mode | ⚠️ Often Light-only in demos |
| Message Ordering | ✅ Guaranteed Causal Consistency | ⚠️ Potential LWW "Shifting" |
🛡️ True Synchronization vs. "Server Modules"
Don't settle for "Server-Side Modules" that just mirror client-side logic over fragile REST APIs. While competitors are just now releasing Node.js wrappers to validate your data, GanttSync was built from day one as a sovereign, CRDT-based synchronization engine. We don't just "calculate" your chart on the server; we ensure every node in your cluster converges to the same state in real-time—even across offline sessions.
⚡ Native-First vs. The "Web Port" Penalty
TeamGantt and other legacy tools are often plagued by heavy browser-bloat. Google’s Interaction to Next Paint (INP) metric heavily penalizes sites and apps that feel sluggish. Read our Engineering Deep-Dive on why Native Dart offers superior performance.
🧩 The Power of Native Flutter Architecture
When a developer searches for "Gantt Sync", they want a widget, not a Chrome tab. Because our charts are lightweight widgets—not heavy JavaScript wrappers—you can drop as many Gantt and PERT views as you need into a single view without performance lag.
👑 Sovereign Logic & Enterprise Security
Support for air-gapped environments and single binary deployment is a massive selling point for enterprise reliability that TeamGantt cannot fulfill. We use Hybrid Logical Clocks (HLCs) and CRDTs to handle synchronization, whereas SaaS competitors generally require a stable internet connection to "sync on reconnect."
🟢 Live vs. Waitlists
While the big names are still building their waitlists and early-access forms, GanttSync is already powering production apps. Don't wait for "Coming Soon" when you can ship today.
Already using legacy_gantt_chart with a REST API?
If your team is outgrowing your current sync logic or facing data conflicts, GanttSync is a drop-in upgrade. Keep your existing UI, replace your REST calls with our sync client, and get instant, enterprise-grade collaboration.
Core Synchronization Engine
⏳ Causality-Based Ordering
Wall clocks are unreliable in distributed systems. We utilize Hybrid Logical Clocks (HLCs) to establish a consistent causal history for every operation. Your data is anchored in a reliable timeline that remains accurate regardless of clock drift or network latency.
🛡️ Strong Consistency
By leveraging Conflict-free Replicated Data Types (CRDTs) combined with database-level constraints, GanttSync guarantees that all nodes converge to the same state. Simultaneous updates are merged automatically and predictably, every time.
🚀 Scalable Architecture
Designed for horizontal scalability. Our engine uses a distributed message bus to broadcast operations across server clusters instantly, supporting high-throughput synchronization for thousands of concurrent users with minimal overhead.
🧠 Constraint-Aware Logic
More than just a datastore. The engine understands the "physics" of project data, enforcing calendar constraints and dependency chains in real-time. The server validates every operation to ensure the integrity of the overall schedule.
UX & Observability: The "Anti-Frustration" Layer
🚦 Clear Status Indicators
Never guess what a "red cloud" icon means. We provide explicit, real-time tooltips and distinct visual states for every sync operation (Queued, Sending, Confirmed). Your users should never be left wondering if their data is safe.
🌑 Native Dark Mode
Enterprise users often work in low-light environments. GanttSync includes a first-class dark mode that respects system preferences, reducing eye strain during long planning sessions. This isn't an afterthought "CSS invert"—it's a carefully curated palette for maximum readability.
📜 Deterministic Ordering
GanttSync uses Hybrid Logical Clocks (HLCs) to ensure that every task, dependency, and comment is ordered exactly as it happened—no "drifting" timestamps or out-of-order logs. Unlike simpler "Last-Write-Wins" strategies that can scramble conversation history, our causal ordering guarantees a linear, logical timeline of events.
Now Available: legacy_pert_chart
We have open-sourced our advanced Network Diagramming engine. Because a visualization tool shouldn't cost as much as a server. While a timeline is sufficient for small projects, complex infrastructure requires non-linear network analysis.
flutter pub add legacy_pert_chart
🕸️ Automated Layout Engine
Our custom PertLayout engine uses an advanced ranking algorithm to automatically organize thousands of non-linear dependencies into logical flow-states, revealing structure in chaos.
🎨 Full Customization
The LegacyPertChartWidget supports custom nodeBuilder functions, allowing developers to create specialized, brand-aware enterprise interfaces for free, without being locked into a rigid default style.
🔄 Open Source (MIT)
Built on the same robust LegacyGanttTask model you already use. We are releasing legacy_pert_chart as a standalone FOSS package, honoring our promise that the UI layer should always be free.
🏢 Enterprise Integration
Connect it to GanttSync for real-time collaboration. The Enterprise edition includes Sync-Aware Controllers that handle live updates, multi-user cursors, and instant critical path recalculation across the network.
Engineering & Resources
Engineering Blog
Deep dives into the architecture of high-performance Flutter applications.
Comparisons
See how GanttSync stacks up against the competition.
Infrastructure & Security
📦 Single Binary Deployment
A compiled, static binary with no external run-time dependencies. Deploy seamlessly to Docker, Kubernetes, or restricted air-gapped environments.
👻 Low-Latency Protocol
Optimized WebSocket communication ensures that updates are broadcast with sub-millisecond latency, providing a fluid experience for all participants.
🛡️ Multi-Tenant Data Isolation
Security is integrated into the engine's core architecture. Our data isolation model ensures that every tenant environment is strictly partitioned, providing robust privacy and preventing cross-context exposure through deep-layer security primitives.
Contact Us
Not ready for Enterprise? Start with our Free Community Edition. Spin up the Open Source Reference Server and upgrade to Enterprise only when you need it.