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i want this for OSX
I do something similar on OSX with OmniGraffle. You can generate an HTML output that it's basically an image with links to other pages. It even works on PDFs.

Anywho, I like this for mobile

You can also do it in Keynote. Just create hyperlinks between slides (which you can do with any shape, via the Inspector). Then export the presentation as a PDF, and the clickable image hyperlinks will be preserved in the PDF file. Then it's also very convenient for sharing with designers/developers/investors, etc.
Here's a really goofy and poorly-thought-out example as a proof of concept. It took about 10 minutes to make. http://goo.gl/AemLD (best viewed in Preview in single-page mode)
Very elegant and powerful solution to a pretty common problem. Does anyone know if something like this exists for web apps?
We use Balsamiq and are pretty happy with it.
so simple--great idea.

This + photoshop mock-ups ftw?

- Export screen mockups from Photoshop

- Save images to Dropbox

- Open images in Dropbox app on your iPhone/iPad

- Save images to Photo Library

- Open images in POP

- Win!

We are thinking if it worth to add a sync with dropbox feature.
Thanks!!! This is beyond awesome.
Woah, that is awesome! This is a pretty ingenious idea. Literally anyone who can sketch an idea, can prototype an app, and unlike other prototyping tools, there are no pre-built pieces to choose from, so the sky's the limit.
I was expecting to pay $5 for this...
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This concept is novel because it replaces the need to "design" the app in a separate piece of software (and learn yet another UI). Although I like Balsamiq sometimes sketching is quicker, and more convenient. I think ideally having both options would be good as sometimes the urge to sketch an idea arises, but normally I would use the software.

Also

Idea: They should sell app mockup paper/pads as a side business.

Check out: UI Stencils http://www.uistencils.com

Can't wait to try POP and UI Stencils together.

Beware if you like sketching with pens only and use these stencils. Will screw up your pen tip.
I've used these stencils before. I would not recommend them. The icon stencils are cut out at the exact size of the icons, but when you're using a stencil you often have to make the stencil larger than the icon you're trying to draw. The result of tracing them often looks like you did a -2px stroke on whatever icon you're illustrating. Also for finer detailed icons, you often can't fit a pencil into the groove of the stencil, even with the provided pencil that comes with it. The lead of the pencil is thicker than the groove in the stencil. The edges of the stencil are often quite sharp as well, and will cut the tips off of felt pens (and create grooves in pencil lead which will cause it to break). Honestly the only thing I now use my stencil for is as a dull knife to open packages (you can easily cut paper, foam, cardboard, or tape with the sides of these things, they aren't sanded down at all).
With stencils use drafting pencils/pens that have a steel sleeve and are designed to be held at right angles to the paper.
Agree on the idea. Pads and colored pencils that allow for more intricate interactions when recognized by the app.
Recursive skeuomorphism.

I love it.

This is great!

Why is it free?

UPDATE Ah: http://jiwo.in/pop-web/plans.html

Ah, paid plans for the mobile version, too. I wonder why that isn't linked on the home page.
Hi this is Wraecca from the POP team, we're sorry that we're not ready for the premium feature, but it will be released soon. Thank you!
The plans on these pages are different, btw. The first one indicates a 'private' option, but that all looks cleaned up in the parent link.
"Why is it free?"

Would that be a bad thing? Why everything has to be paid for?

Potentially, yes. You want products you like to have a business model so that they are kept alive.
what business model does linux kernel have, and how much does it cost?

EDIT: OK, just to make it clear. I'm not against people asking money for they creations, I'm all 100% up for it. What really pisses me off is 'why is it free?!', and 'i would happily pay $XXX for it!'. Please, keep that to yourself - if someone decided not to take money for their work, it's entirely up to them, and that deserves some respect.

Making an app and releasing for free it can be fun. When the customer support and feature requests start pouring in it becomes a lot less fun. Chances are more likely that a project will be abandoned for one reason or another (developer gets bored, gets busy with their 'real' job, etc.)

When people see an idea that's good, especially for potential business use (and especially on HN which as a community of entrepreneurs) they are letting the developer know that they have created something that is worth having around and would pay to see it maintained.

Linux is probably a bad comparison, because it has so much corporate support and is an entire ecosystem of business models for probably hundreds if not thousands of companies.

Why are you afraid of open discussion about pricing?

(Millions of dollars have been invested in Linux development by commercial interests, even if most distros are free-as-in-beer.)

I think it was just out of curiosity; I had the exact same question.

Also, "Why is it free?" is another way of asking "What's the catch?". It's important to understand this before you put in a bunch of work...

I'd much rather buy the app for the iPhone than pay a monthly subscription.
Because those engineer is doing their job and we need to let them have more power to do such a wonderful stuff.
The pricing seems way too low. $30 dollars a month for studios is pocket change to a 30+ person team
Uhm... does this mean the app cannot work offline?
Well done, this is great.

So much more sense to use an existing layer on the tech stack (paper & pencil) rather than inventing yet another way of putting black lines on a white background.

Nothing to stop you sketching out your menus (and other repeating fragments) on smaller pieces of paper and collaging them together either.

My whole visit on this website I spent looking for the resulting prototype I could play with. If the product of your app is something interactive, why not show it off?
We plan to build a dribbble like site but with interactive prototypes (only those who want to be seen)
This reminds me of codiqa [1], a web app for creating skeleton mobile web apps. I use it all the time to mockup basic workflows like this.

disclaimer - I am a customer of codiqa.

[1] - http://codiqa.com

Genius. And it's not often I say that.
Be sure to click the Plans button in the toolbar. You can get 5 to 20 free projects.
Just got 20 extra projects. How will the new pricing rollout affect this?
It's only for early birds. Once the service is worth you paying the give away page will be gone.
Someone emailed us and said she's only got 6 give away projects while her friend's got 17. She said it's so unfair and she will never pay for this...
Haha. You should have asked if they used a tweet option to increase their chances :)
Great App! Just tried it with UI Stencils and it really helps with testing of usability with an actual device.

Sadly there seems to be a bug with image alignment. Even if I get it right in cropping tool it looks like its shifting all images up and to the right by that looks like 10 to 15px. Other than that fantastic.

Hi this is Wraecca from the POP team, I'm sorry about the bug, we'll fix it as soon as possible. Thanks for reporting!
Can't wait to try this out. I've done something similar for other UX designers by taking flat screenshots and overlaying an image map with clickable areas. Instant "high fidelity" prototype!
Idea suggestion:

Freely distribute a PDF that has unique border patterns so when people use/print it out and use that paper, and proceed to take a photo, the program can detect the borders and auto zoom in/out so you end up with a nicely fitted screen shot on the phone. Then users never worry about getting the heigh/width ratio right or bother with the cropping step. And you get to plaster your branding all over the desk of those that uses it :)

We are working on this. This feature will probably come with a special made notebook.
Here's an off the wall idea that i'm not sure is even technically feasible, but:

How about a way to "OCR" the drawn interface in a way that the software is able to parse the elements out (buttons, toolbars, swatches, etc.) maybe using the iOS HIG and other contextual clues. The output would be a xib file, ready to iterate on.

That's a great idea but it's technically too hard for us :(
Idea suggestion 1: Shape detection. Presumably this is already present given that it looks for the borders of the viewscreen. It would be really great if it could detect potential buttons in the app, and auto-select them to improve the speed of the workflow.

Idea Suggestion 2: Color coding. Use a highlighter to color in buttons in some color. Your app would automatically recognize things of that color as buttons, and potentially erase the color in the "finished" prototypes.

A comment about suggestion 1: The creators may have prior computer vision experience, but as someone who tried to learn this from scratch and perform handwritten shape detection I can say that it's a messy place to work. If it's not their core competency, it can get tricky with all the different shapes and problems that may arise with said shapes. Then again, I didn't have machine-learning experience which may be the way to go.

That would definitely be cool, though. You could basically edit what you literally just drew if you could properly detect the shapes and how they were nested within each other.

It's really hard to do detection with hand drawing. We might make special stickers for common UI elements (botton, tab bar ...). The color coding suggestion is great, thanks!
Usability suggestion: Don't force me to create an account BEFORE I receive any value from your app. Creating an account is a pain. It's not clear why I need an account. It most definitely benefits you, even if you think it's better for me in the long run.

Hold the account-setup step until I've created my first project and want to do something with it. That's when I'll be able to easily understand why I need an account.

Sorry about that, we will release a standalone version that does not need to pay monthly fee nor singup before using.
One thing that keeps happening: when I take a picture and finish cropping the app severely cuts off the right size of the picture. Any chance for a fix?
Sorry for the bug, we'll fix it soon! Thank you :)
Didn't try it out (I'm an Android user), but nice idea. I forwarded it along to some old colleagues who are into Lean Startup, as this seems like a useful tool.

Unrelated to the app itself, but the website, the use of the word "feedbacks" seems pretty weird. (Are you a non-native English speaker?)

  Sharing & Feedbacks
  Share your prototype with colleagues and friends. They
  can try out and comment on your prototype on their
  iPhone, iPad or in web browsers. You’d be surprised
  how valuable their feedbacks are.
I would recommend using the word "feedback" instead. e.g.:

  Sharing & Feedback
  Share your prototype with colleagues and friends. They
  can try out and comment on your prototype on their
  iPhone, iPad or in web browsers. You’d be surprised
  how valuable their feedback is.
You're right, we're not native English speaker. Thank you for correcting :)
Honestly, it shows in a few places. I think you have a hell of a product. It might be worth it to pay someone $50 to proof read it. (or even a fellow HN'er who will do it for a pro account)
I know this is probably a stupid question, but what are you using for the videos on the site. I like they way they are just in their without controls or anything.
It's the HTML5 <video> tag.