I like that the user friendliness and the fact that it's frequently updated. It has a lot of interactions in the library and it's totally doable to fully prototype a basic app and make it look great. Review collected by and hosted on G2.com.

It does not have all of the functionality that a tool like Axure has. It can also be problematic that it's web-based. Review collected by and hosted on G2.com.

The ability to prototype detailed interactions is very advanced. Their library of existing controls is very helpful when putting the pieces together in a prototype. The ability to export the final prototype into html, css and js is very helpful and works very smoothly when you try to add them on websites as part of portfolios or want to depict the interaction on a promotional page. Review collected by and hosted on G2.com.

The learning curve in proto can be very high for certain types of interactions and might take a lot of time to conceptualize. This is the case only for very advanced interactions and might hold true for certain simple interactions as well.

Layer and object management can be very tedious if the prototype is very big and spans multiple screens and elements. It very much depends on how many micro-interactions are present in the prototype.

Considering this is a web client, sometimes working on interactions on the browser itself can be very slow and tedious. This is not a completely tool level problem. At several instances browsers tend to slow the system and hence, the client suffers as well.

It looks like their recent improvements on the web client has improved speed and made it less heavy. Review collected by and hosted on G2.com.

What I really like about Proto.io is how well made it is. Not only is it easy to use but the amount of detail you can put into your prototype is insane! Not to mention that they have an app where you can pull up your prototype on your phone! How cool is it that you can just take out your phone and show your friend the prototype of your next project. Review collected by and hosted on G2.com.

What I don't like about it is that sometimes it really starts to lag. Since there are so any features and things you can add to your mock up or prototype it starts to drag down the response time for basic functions of moving around the site. Review collected by and hosted on G2.com.

Proto.io allows you to make aesthetically appealing mobile prototypes that mimic the functionality of a real application. It also allows users to add details and animation to prototypes. Review collected by and hosted on G2.com.

It can be difficult to use and clunky. At times, it lags, which is extremely frustrating. Adding small details into wireframes can also take a lot of time. It took a lot of effort to prototype many screens. My team also had difficulties prototyping at the same time using proto.io when using the same account. If two people were working on different frames at the same time, one person's work would not save. Review collected by and hosted on G2.com.

the prototyping options available is great Review collected by and hosted on G2.com.

the limited 15 day trial period and then its expensive. Some times if the number of screens are high then it lags. Review collected by and hosted on G2.com.

It is a good software for mobile prototyping as it also allows to view the prototypes offline and natively on both android and iphone with a customised app icon. Also, it allows easy importing of the assets directly from Sketch and Photoshop which reduces the time in asset management to a great extent. One more thing that is great about proto,io is that it has a layer based stacking for the assets which allows for creating easy animations and better interactions. Review collected by and hosted on G2.com.

I do not like the way it has been designed, there are a lot of options presented to the user on the main screen making the entire interface look too cluttered and also reduces the canvas space. Also, there ain't any mac app for Proto.io which does not allow one to prototype without internet. Review collected by and hosted on G2.com.

1. Mobile Element for quick mobile app mockup

2. Easy to use interface

3. Clear tutorial for basic function

4. Easy to review mockup on mobile phone

5. Automatic alignment Review collected by and hosted on G2.com.

1. Limited tutorial resource for advanced function

2. The mouseover interaction is not fluid

3. Slow loading speed for online prototype

4. Small canvas size for mockup

5. Unable to view website mockup in full screen Review collected by and hosted on G2.com.

Proto.io is probably one of the best software packages that I have ever used. It is very intuitive and I appreciate how much work they put into making this product incredibly easy to use. Review collected by and hosted on G2.com.

The loading time of the previews is cumbersome, however that is dependent on your own project size and wifi speed. Not much to dislike here. Review collected by and hosted on G2.com.

Proto.io gives a lot of freedom to create fully interactive prototypes. I find it extremely helpful for cases when your flow depends on complex gestures. Mobile prototypes work super smoothly, almost like a real app! Review collected by and hosted on G2.com.

It seems a bit over complicated if you need a quick prototype. Takes a lot of effort to build high-level visual prototype using custom assets. Also it is kind of slow when you are working with multiple pages Review collected by and hosted on G2.com.

I liked the seamless transitions and hover effects I was able to implement. I used a video playbook for my background and I was very happy with the outcome. Also, the drag and drop feature came in handy when considering aspect rations. Review collected by and hosted on G2.com.

As of the last time I used it (Jan 2016), it was confusing to prototype long scrolling screens. It took me time to figure out that I had to set individual pages. The web app is also not very light weight so it gets a little slow when I flip between it and graphic editing programs. Review collected by and hosted on G2.com.