The average iPhone user has tried at least three to-do apps and abandoned all of them. That's not a wild guess—it's the pattern you see whenever you ask people about their productivity setup. The apps weren't bad. The mismatch was. Someone with fifty active projects installed a minimalist two-field app. Someone who needs a quick capture installed a six-panel GTD powerhouse and spent forty minutes setting up areas of responsibility before giving up.
This article cuts through that by being direct about who each app is actually for. The picks below are based on what each app genuinely does well, where it frustrates users, and what kind of work style it rewards. There's no single winner. There is, however, one that's right for your situation—and this page will tell you which one.
Things 3 — The Best App for People Who Care About How Their Day Feels
Cultured Code's Things 3 costs $9.99 on iPhone (plus separate prices for iPad and Mac), and it is the rare piece of software that people describe with words like delightful without sounding ridiculous. The typography is exceptional, the animations are purposeful rather than decorative, and the core workflow—capture, schedule, do—is so frictionless that it actually changes behavior. When an app is pleasant to open, you open it. When you open it, you review your tasks. When you review your tasks, you do them. That chain matters more than any feature list.
Things 3's organizational model uses Areas (broad life domains like Work or Health), Projects (specific outcomes with an end state), and Headings inside projects for grouping. It also has a unique feature called the Evening Review, where the app surfaces what you scheduled for tomorrow so you can approve or adjust before you sleep. That single workflow has more practical impact than most apps' entire feature sets.
Where Things 3 falls short: it has no collaboration features whatsoever. You cannot share a project with a colleague. It also has no web version, so if you spend meaningful time on a Windows machine, you're locked out. And while it supports recurring tasks and deadlines, its natural language input—typing "dentist Friday 3pm" and having it parse correctly—is less reliable than Todoist's. If your work is primarily solo and primarily on Apple devices, Things 3 is the best-designed tool in this category. If you collaborate or live in a browser, it isn't.
Todoist — The Most Capable App for Cross-Platform Power Users
Todoist has been around since 2007, which in productivity app years makes it practically ancient. That longevity has produced something genuinely rare: a mature, stable application that works on every platform you'll ever touch—iPhone, Android, Mac, Windows, Linux, web, and inside Gmail, Outlook, Slack, and dozens of other services. If you switch between a work Windows laptop and a personal Mac and an iPhone, Todoist is the only app that doesn't ask you to compromise somewhere.
The natural language input is best-in-class. Type "submit report every Monday at 9am p1" and Todoist correctly sets a recurring Monday task, sets the time, and flags it as Priority 1. That sounds like a small thing. When you're capturing tasks quickly, small frictions compound into not capturing at all, which defeats the entire purpose. Todoist removes that friction better than any competitor.
The organizational depth is serious. You get Projects, Sub-projects, Sections within projects, Labels, Filters, and a dedicated Priority system with four levels. The Karma system—which tracks your completion rate and streaks—is either motivating or annoying depending on your personality. You can disable it.
The weakness: Todoist's interface, while functional, lacks the visual warmth of Things 3. It's an efficient tool that looks like an efficient tool. The task entry screen on mobile also has a learning curve—new users often miss that you can long-press the schedule button to get the natural language parser. That discoverability problem is a real design flaw in an otherwise polished product.
OmniFocus 4 — For GTD Practitioners Who Mean It
OmniFocus is built by the Omni Group in Seattle, and it is designed from the ground up around David Allen's Getting Things Done methodology. If you've read the GTD book and actually restructured how you work around it—weekly reviews, someday/maybe lists, context-based task filtering—OmniFocus 4 is the most complete implementation of that system that exists on any platform.
The app's Perspectives feature is the heart of it. You can create custom filtered views of your task database based on any combination of tag, project, due date, defer date, estimated duration, and flag status. A Perspective called "Quick Hits" might show all tasks tagged @calls with an estimated duration under 10 minutes that are available right now. That kind of filtering is exactly what GTD's context-based work recommends, and no other iPhone app does it as well.
The Inspector panel lets you set defer dates (the earliest a task should appear in your lists), due dates (when it must be done), and estimated time per task. These three fields together let you build a genuinely intelligent scheduling system. OmniFocus can tell you, with real specificity, what's available to work on right now given your current context.
The honest cost assessment: OmniFocus 4 requires a subscription of roughly $9.99/month or $99.99/year, or a one-time purchase for the Standard version that lacks some automation features. This is expensive. It's also earned for the right user. The right user is someone who manages 200+ tasks across many projects and has the discipline to do weekly reviews. For someone with a dozen tasks and one job, OmniFocus is a sports car used to drive to the grocery store. It won't make you faster; it'll just make parking harder.
TickTick — The Best All-in-One App If You Also Want a Timer and Calendar
TickTick (made by Appest Inc.) does something none of the other apps on this list do natively: it includes a Pomodoro timer built directly into each task. You open a task, tap the tomato icon, and a 25-minute focus timer starts running against that specific item. When the session ends, it logs the focus time. For people who use the Pomodoro Technique—and there's meaningful evidence it reduces decision fatigue during focused work—having the timer attached to the task rather than running in a separate app is a genuine workflow improvement, not a gimmick.
TickTick also includes a calendar view that shows your tasks sitting on an actual calendar grid alongside your calendar events synced from Apple Calendar. This matters more than it sounds. Most to-do apps show tasks in a list, completely decoupled from your schedule. TickTick shows you that you have three tasks due Tuesday and also two meetings totaling three hours, which means Tuesday's task list needs to be shorter. That spatial, time-aware planning is closer to how most people actually think about their days.
The app supports habits tracking, which lets you build streaks for recurring behaviors like exercise or journaling. It's basic compared to dedicated habit apps like Streaks, but for someone who wants tasks and habits in one place, it's good enough. Collaboration is possible on TickTick—you can share lists and assign tasks—which puts it ahead of Things 3 and OmniFocus for team use, though behind purpose-built tools like Asana or Linear for anything complex.
< The free tier is restrictive—you're limited to one level of task nesting and a small number of lists—but the premium tier unlocks enough that it's a fair exchange. The main limitation to flag: TickTick's design is visually busier than Things 3 or Todoist, and the feature density can feel overwhelming on a 6-inch screen during initial setup.Apple Reminders — Genuinely Underrated if You're All-In on Apple
Apple redesigned Reminders significantly in iOS 13 and has kept improving it through iOS 17 and 18. The current version supports subtasks, smart lists that auto-populate based on rules you set, tags, early reminders before deadlines, grocery list grouping by category, and collaboration via iCloud sharing. That's a real feature set—not a stripped-down placeholder.
The argument for Reminders is integration depth that third-party apps can't match. Siri works more reliably with Reminders than with any other app. When you say "Hey Siri, remind me to call Marcus when I get home," it works. Location-based triggers, which remind you of something when you arrive at a specific address, are more consistently reliable in Reminders than in competing apps that use the same iOS location APIs but handle background refresh differently. Natural language input via Siri and the keyboard both work well.
Reminders also syncs across Apple Watch, Mac, and iPad with zero configuration. There's no account to create, no subscription to manage, and no third-party server holding your data. For privacy-conscious users, this is a real benefit. Apple's iCloud terms govern your data rather than a smaller company's terms.
Where Reminders reaches its limit: there's no priority system beyond a single flag, no duration estimates per task, no Kanban view, no integration with external services like Gmail or Slack, and the Android/Windows absence is total. The moment your work requires seeing tasks alongside projects with multiple stages, or filtering by context, you've outgrown it. But for a person managing personal errands, family tasks, and a relatively straightforward job, Reminders in its current state is quietly one of the best tools available—and it costs nothing.
How to Choose: Matching App to Working Style
The four questions that actually determine the right app for you are more specific than most comparison articles admit:
- How many active tasks do you carry at once? Under 30 tasks: Reminders or Things 3. 30 to 100: Todoist or TickTick. Over 100 with complex dependencies: OmniFocus.
- Do you work on non-Apple devices? If yes, OmniFocus and Things 3 are immediately limited or eliminated. Todoist or TickTick are the cross-platform choices.
- Do you need to collaborate on tasks with other people? If yes, Reminders (for family/Apple users), TickTick (for teams of any size), or Todoist (for broader team use). Things 3 and OmniFocus are solo tools.
- Do you follow a specific productivity methodology? GTD practitioners get the most from OmniFocus. Time-blocking practitioners benefit from TickTick's calendar integration. Capture-first thinkers (the approach popularized by Allen and others like Cal Newport) generally prefer Things 3's frictionless inbox.
One honest note on app-switching fatigue: switching productivity apps resets your system. Every switch costs roughly two to four weeks of reduced productivity while you rebuild your organizational structure in the new tool. The best app is often the one you'll actually stick with, which is usually the one that matches your work style closely enough that the maintenance doesn't feel like work itself. Try one seriously for three weeks before making a judgment.
If you're completely new to structured task management and have no current system, start with Reminders or Things 3. Not because they're simpler—though Reminders genuinely is—but because they create less opportunity to spend your time organizing rather than doing. The danger with OmniFocus and Todoist for beginners is that the configuration surface is large enough to become its own project.
Features That Sound Good But Rarely Change Behavior
App makers know which features get mentioned in reviews, and they build toward those features accordingly. A few of them look impressive in screenshots and rarely affect how much you get done.
AI task suggestions. Several apps now offer AI-powered recommendations—Todoist's AI Assistant can break a vague task into subtasks. In practice, most people who tried this feature used it a few times and stopped. The reason: task breakdown requires knowing your own context (who's on the project, what tools you have, what's already been done), and generic AI suggestions often miss that context. It's a useful occasional tool, not a productivity shift.
Gamification and streaks. Todoist's Karma, TickTick's habit streaks, and similar systems work for some people and actively demotivate others. If you're the kind of person who skips the gym because a rain day broke your streak and now it feels pointless, these features will hurt you. If streaks motivate you the same way they motivate athletes tracking training load, turn them on. There's no universal answer.
Deep integrations with other apps. Todoist integrates with 60+ services. Zapier can connect almost any app to almost any other. In reality, most people use one or two integrations repeatedly and ignore the rest. The integrations worth actually evaluating are with the tools you open every day: your email client, your calendar, your team communication tool. If you live in Slack and Todoist integrates with Slack in a way that fits your workflow, that's real. The other 57 integrations are noise.
. Every app on this list. The differences in behavior (syncing conflicts, attachment availability, recurring task generation) matter only in specific edge cases—long flights with heavy task loads, for instance. It's worth testing for your situation rather than taking a feature checklist at face value.
Frequently Asked Questions
What is the best free to-do list app for iPhone?
Apple's Reminders is the strongest free option because it's deeply integrated with Siri, Apple Watch, and iCloud, and the iOS 17 and 18 versions include subtasks, tags, and smart lists. Todoist's free tier is also genuinely usable for simple task management, though reminders and filters require a paid plan. TickTick's free tier is more restrictive, limiting you to one level of nesting and a small number of lists.
Is Things 3 worth the price for iPhone?
Yes, for solo users on Apple devices who do complex work. The one-time purchase model means you pay once and own it—no subscription creep. The design quality is high enough that it actually changes the habit of opening the app. It's not worth it if you need collaboration, a web version, or frequent use on Windows or Android.
Can I use OmniFocus without knowing GTD?
Technically yes, but you'll likely feel overwhelmed and underserve the app's strengths. OmniFocus's power comes from its Perspectives and defer-date system, both of which are designed around GTD's context-based workflow. Without that framework, the app's complexity feels like friction rather than capability. If you're interested in OmniFocus, reading David Allen's Getting Things Done first will make the app click much faster.
Does TickTick really have a Pomodoro timer?
Yes, and it's built directly into individual tasks, not just a standalone timer. You can start a 25-minute focus session against a specific task from within the task detail view, and TickTick logs the time spent. You can also customize the session length. It's one of the few productivity apps to integrate Pomodoro at the task level rather than as a separate app or add-on.
Which iPhone to-do app is best for students?
TickTick or Todoist, depending on budget. TickTick's calendar view is particularly useful for students juggling assignment deadlines alongside class schedules. Todoist's free tier is generous enough for most student task loads, and its natural language input makes quick capture between classes genuinely fast. Things 3 is excellent but costs money upfront. OmniFocus is overkill for most students.
Can iPhone to-do apps sync with Google Calendar?
Most do not sync directly with Google Calendar in a two-way sense—they typically show tasks and calendar events side-by-side rather than writing tasks back to Google Calendar. TickTick does display Google Calendar events alongside tasks in its calendar view. Todoist shows tasks on a timeline but doesn't push tasks into your Google Calendar by default; you can achieve that via a separate calendar subscription URL that Todoist generates. Apple Reminders syncs with Apple Calendar, not Google Calendar.
What to-do app works best with Apple Watch?
Apple Reminders has the deepest Apple Watch integration because it's a system app—complications, Siri commands, and glanceable lists all work without any extra configuration. Things 3 has a solid Apple Watch app that shows your Today list and lets you check off tasks. Todoist's Apple Watch app is functional but has historically been slower to update with new watchOS features. OmniFocus has Watch support but it's less polished than Things 3's.
Is there a to-do app for iPhone that also tracks habits?
TickTick includes a habit tracker that supports daily and weekly habits with streak tracking, though it's simpler than dedicated habit apps like Streaks or Habitica. For most people who want tasks and habits in the same place without managing two separate apps, TickTick's habit module is good enough. If habit tracking is a primary use case rather than secondary, Streaks (iPhone-only, one-time purchase) is substantially more capable.