To-do lists are a very important part of managing my projects efficiently, so I've spent quite a bit of time finding the right apps.
As I use various platforms e.g. an Android phone, Mac computer and a PC at the office, you'll find that all of these apps are available on multiple platforms.
As I use various platforms e.g. an Android phone, Mac computer and a PC at the office, you'll find that all of these apps are available on multiple platforms.

ToDoist:
ToDoist is for those who need more than just basic lists, this app is for those of us who have multiple projects on the go at once.
This app provides multi-level lists and sub-tasks; these are quite simple to setup once you've had a quick drive around of it. The basic version is free and you will find it suitable enough for most situations. You can even share your projects with others and you will be able to see when they complete tasks. If you find more features necessary you can upgrade to a subscription for $29.00 USD per year - this price is actually reasonable for a small business like mine. I upgraded to this version as I like having features such as mobile task reminders and syncing with my Google calendar.
todoist.com
ToDoist is for those who need more than just basic lists, this app is for those of us who have multiple projects on the go at once.
This app provides multi-level lists and sub-tasks; these are quite simple to setup once you've had a quick drive around of it. The basic version is free and you will find it suitable enough for most situations. You can even share your projects with others and you will be able to see when they complete tasks. If you find more features necessary you can upgrade to a subscription for $29.00 USD per year - this price is actually reasonable for a small business like mine. I upgraded to this version as I like having features such as mobile task reminders and syncing with my Google calendar.
todoist.com

Wunderlist:
Wunderlist is good for those who simply require basic lists but also includes a handy task assigning feature.
I use this for my grocery lists so that I can go straight to it and not worry about the many projects I have in ToDoist. It provides a clean, easy to use interface that allows multiple lists and sharing your lists with others. It’s completely free but you'll need to upgrade to a paid subscription to assign tasks to everyone working on a project with you. "Wunderfully" though they only need the free version to see their assigned tasks.
wunderlist.com
Wunderlist is good for those who simply require basic lists but also includes a handy task assigning feature.
I use this for my grocery lists so that I can go straight to it and not worry about the many projects I have in ToDoist. It provides a clean, easy to use interface that allows multiple lists and sharing your lists with others. It’s completely free but you'll need to upgrade to a paid subscription to assign tasks to everyone working on a project with you. "Wunderfully" though they only need the free version to see their assigned tasks.
wunderlist.com

Evernote:
Most people know about and already use Evernote which is why this has been mentioned last, you can skip this part if you're familiar with it already but if you're not, it's popular for a reason!
Evernote is great for writing long notes, saving web pages and including attachments all in a 'notebook' for each project. I use Evernote to write these blogs and save web pages about interesting business information. All of your notes are editable with great formatting options on many platforms. Some even use it for their to-do lists; I don't do this as I think an app designed specifically for to-do lists is more efficient. Again it's free and you can pay for a subscription for additional features, which I haven't found necessary yet.
evernote.com
Most people know about and already use Evernote which is why this has been mentioned last, you can skip this part if you're familiar with it already but if you're not, it's popular for a reason!
Evernote is great for writing long notes, saving web pages and including attachments all in a 'notebook' for each project. I use Evernote to write these blogs and save web pages about interesting business information. All of your notes are editable with great formatting options on many platforms. Some even use it for their to-do lists; I don't do this as I think an app designed specifically for to-do lists is more efficient. Again it's free and you can pay for a subscription for additional features, which I haven't found necessary yet.
evernote.com
I've found the combination of these apps is what works for me, keeping me productive and efficient. Let me know what apps you have found that work best for you and why?
Please note I do not get paid for these recommendations these are purely based on my own experiences and research.
Please note I do not get paid for these recommendations these are purely based on my own experiences and research.