Adobe’s latest app is a powerful brainstorming and publishing tool for laying out words and images in a beautiful web layout. Whether you’re a student working on a project or a businessman creating an office presentation, Slate is designed to be flexible with pre-installed themes and plenty of tools.

The easiest way to summarize Slate is a dumbed-down version of InDesign for the iPad. It’s nice to see powerhouses like Adobe continuing to invest in the tablet as a content creation tool. For an example of what you can make with Slate, check out this gorgeous story on Snowy Owls.

Available on: iPad

Price: Free

Download: App Store

Originally only available on Windows Phone, the favorably reviewed Office Lens app launched on iOS this week.

Office Lens is like a swiss army knife of scanners. It can scan everything from paper documents, business cards and whiteboards and then format it into a PDF, PowerPoint, or Word document. Printed text is scanned with OCR to make it editable like a normal document, and save options include OneNote or OneDrive.

Available on: iPhone

Price: Free

Download: App Store

Version 10 of Todoist is a big update. It’s got Fantastical-style natural language parsing for adding tasks, a new quick add experience for adding tasks and notes on the fly, and multi-task editing.

There’s also the addition of start and end dates, collapsable list views, and 10 new themes. Bottom line: if you’re looking for a cheap, well designed, feature-rich todo app, you’d be crazy to not at least consider Todoist.

Available on: iPhone/iPad

Price: Free (certain features unlock with Premium in-app upgrade)

Download: App Store

What if you combined the viral nature of Vine with the mini-story capability of Snapchat? That’s what Facebook is trying to do with Riff, a new app that was released in the App Store this week.

Created by Facebook’s Creative Labs (the same group behind Paper, Groups, Rooms, etc.), the Riff app lets you create a 20-second video, post it, and have your friends add to it with short videos of their own. The idea is the same snowball effect that made the ALS Ice Bucket Challenge such a viral phenomenon; you keep a video meme going by letting others pile on.

Will it catch on? The odds aren’t too great when you consider how crowded the market already is for this kind of app. But there’s no harm in giving it a test run to see if it’s got potential.

Available on: iPhone

Price: Free

Download: App Store