What a real GTD app needs
David Allen's Getting Things Done methodology has specific structural requirements that most task managers don't meet. A real GTD app needs more than checkboxes and due dates. Here are the five non-negotiable features:
“Leaving OmniFocus was probably the hardest technological decision I've ever made. I can't afford being in a vendor lock-in with Apple.”OmniFocus power user, Hacker News
1. Defer dates (start dates)
The ability to hide a task until it becomes actionable. If something can't be started until next Monday, it shouldn't clutter your Today view this week. This is how you maintain a clean, trusted system. Without defer dates, lists grow unmanageable and the system breaks down under its own noise. (See our deep dive on defer dates.)
2. Sequential and parallel projects
GTD distinguishes between projects where tasks must happen in order (sequential) and projects where any task can be done at any time (parallel). In a sequential project, only the next action should be visible. This keeps your Next Actions list honest — showing only what you can actually do right now.
3. Weekly review
Allen calls it “the critical success factor for your personal management system.” A dedicated mode that walks through every project, flags stale items, and ensures nothing has fallen through the cracks. This isn't a recurring task — it's a built-in workflow.
4. Contexts or tags
Filtering tasks by where you are or what tools are available — @phone, @computer, @errands, @office. In 2026, energy-based contexts (deep work, medium focus, quick wins) are increasingly relevant alongside location-based ones.
5. Ubiquitous capture
Your trusted system must be available everywhere, always, with zero friction. If you can't capture a thought in under 3 seconds from any device, items will slip through. This means cross-platform access is a methodology requirement, not a convenience feature.
The GTD app landscape in 2026
Here's how the major apps stack up against GTD's actual requirements. This isn't about which app is “best” overall — it's specifically about which ones support the GTD methodology.
“Thousands of people having to run two separate to-do list manager systems is what marketing experts call 'an important but unmet customer need.'”mwooten777, Omni Group Forums
| Feature | OmniFocus | Todoist | Things 3 | TickTick | Nirvana | SingleFocus |
|---|---|---|---|---|---|---|
| Defer/start dates | ✓ | ✗ | ✓ | Partial | ✓ | ✓ |
| Sequential projects | ✓ | ✗ | ✗ | ✗ | ✓ | ✓ |
| Review mode | Native only | ✗ | ✗ | ✗ | ✗ | ✓ |
| Custom perspectives | View on web* | Filters | ✗ | Smart Lists | Basic | ✓ |
| Contexts / tags | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| Areas of responsibility | ✓ | ✗ | ✓ | ✗ | ✓ | ✓ |
| Waiting For status | ✓ | Label | ✗ | Label | ✓ | ✓ |
| Someday / Maybe | ✓ | Project | ✓ | ✗ | ✓ | ✓ |
| Windows + Android | ✗ | ✓ | ✗ | ✓ | ✓ | ✓ |
| Annual price | $100 | $60 | ~$80 once | $36 | $39 | Free** |
Each app, measured against GTD
OmniFocus — the gold standard, locked in Apple's ecosystem
The deepest GTD implementation available. Defer dates, sequential projects, perspectives, review mode — everything. But it only works on Apple devices, and while the web app supports basic task management (including defer dates and sequential projects), it lacks search, review mode, and perspective editing. Costs $100/year. If you're fully Apple, it's still the benchmark. If you have a single non-Apple device, you're stuck. (See our full OmniFocus alternative comparison.)
Todoist — the popular choice that isn't built for GTD
30 million users, runs everywhere, best natural language input. But no start dates (the most-requested feature on its subreddit for years), no sequential projects, and no review mode. You'll build elaborate label-and-project workarounds to simulate what a real GTD app provides natively. The December 2025 price hike to $60/year has users reconsidering. (See Todoist vs SingleFocus for the full comparison.)
Things 3 — beautiful and GTD-friendly, Apple-only
The most emotionally beloved task manager available. True “When” dates that hide tasks, a calm Today view, gorgeous design. But Apple-only with zero web access, no sequential projects, no custom perspectives, no review mode, and glacially slow development. If you're fully Apple and don't need deep GTD structure, Things 3 is a joy to use.
TickTick — maximum features, not built for GTD
Best value at $36/year with a Pomodoro timer, habit tracker, and Eisenhower matrix. But start dates require an end date (not true defer dates), no sequential projects, no review mode, and persistent reliability concerns. A great all-in-one tool if GTD isn't your primary methodology.
Nirvana — the GTD purist's choice, with caveats
Purpose-built for GTD with sequential projects, defer dates, and proper GTD workflow stages. Still actively maintained as of 2026, but no custom perspectives, no review mode, and a utilitarian interface. If you want strict GTD fidelity at $39/year and can accept the gaps, Nirvana is the closest competitor.
SingleFocus — the GTD app built for the web
SingleFocus was designed to close the gap between OmniFocus's GTD depth and the cross-platform access that Todoist and TickTick provide. It's the only web-native app that combines all five GTD essentials: defer dates, sequential projects, custom perspectives, a built-in weekly review, and ubiquitous capture through any browser.
Beyond the GTD foundations, SingleFocus adds capabilities no competitor offers:
- ML-powered focus pick — a personalized model trained on your completion patterns that suggests what to work on next
- Energy lens — filter tasks by mental energy level (deep focus, medium, quick wins) so you work with your brain, not against it
- Productivity insights — rhythm heatmaps, velocity tracking, project momentum, drift detection, and a year-in-review dashboard
- Rescue mode — automatically simplifies your view when it detects overwhelm, showing one task at a time with a calming interface
- AI assistants via MCP — manage tasks through Claude, ChatGPT, or any Model Context Protocol-compatible AI
Real Free plan; Pro from $8/month. Works on Windows, Mac, Linux, Android, iOS, Chromebook — anything with a browser.
The real question isn't “which app is best”
It's “which app will I actually use?” The perfect GTD app that you abandon after a month is worse than a mediocre one you stick with. The research across thousands of users reveals one consistent finding:
“People don't hire a task manager to be more productive — they hire it to feel less anxious.”
The trusted system, the “mind like water,” the confidence that nothing is slipping — that's the outcome that matters. The features are the mechanism. The feeling of calm control is the product.
Choose the app that makes it easiest for you to maintain that feeling every day, on every device you use.
“I have adult ADHD. I have owned OmniFocus 1, 2 and now 3 Pro, hoping it will help organize my life. And I have basically never used it.”Mac Power Users Forum
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