Proto.io vs Justinmind
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Proto.io
This application allows users to preview and interact with their Proto.io projects on any device. It supports native touch gestures for a realistic prototyping experience and offers offline viewing of cached projects. Users can also record and share their prototype interactions.
- Preview shared Proto.io projects
- Access all projects from your account
- Full-screen prototype viewing
- Interact with native touch gestures
- Preview on any device/screen size
- Offline viewing of cached projects
- Record and share prototype interactions
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Proto.io App brings your Proto.io projects to life! It allows you to use all the native gestures to interact with elements and makes full use of your screen estate. **Key features include:** - Preview projects shared with you - Login and access all your projects in your Proto.io account. - Preview your projects in full screen without any obstructions. - Ability to interact with your projects using all supported touch gestures: Pinch, swipe, tap, tap & hold and more. - Preview any prototype on any device/screen size regardless of the device /screen size it was designed for. - When previewing a project it is saved in your device cache so that you can view it again without an internet connection - Record and share your interactions with a prototype
Justinmind
Create fully functional mobile app prototypes with advanced gestures, transitions, and effects. View and test your designs on mobile devices, even offline, for seamless demos and presentations.
- Create interactive prototypes
- Mobile gestures and transitions
- Offline prototype viewing
- Cloud sharing
- Mobile and tablet adaptation
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Justinmind’s prototyping tool is a one-stop shop for interaction design. Go far beyond a simple hotspot and create fully functional prototypes with mobile gestures, transitions and effects. Design mobile app prototypes that behave like the real thing! All your work created with Justinmind’s prototyping tool can be shared on the cloud. Once your prototypes are in the cloud, they become accessible via the Justinmind app viewer. This means you are free to test and experience your work using your mobile phone! Download your prototypes and have them at hand, working independent of internet access. Prepare for your demos or UX presentations and assure success, even when offline! The Justinmind app viewer adapts itself to your mobile and tablet devices. If you enjoy using Justinmind app, please share a nice review. It really helps!
Screenshots
Verdict
The clearest difference is rating: Proto.io at 3.7 against Justinmind's 3.3. Proto.io also leads on iOS requirement (10.0 vs 12.0). Justinmind's advantage is review sentiment (52% vs 42%). On price, ratings volume, update cadence and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Proto.io holds the better App Store score, 3.7 against 3.3. Both are backed by a comparable volume of ratings — 6 and 15 respectively. Written reviews complicate that: 42% of Proto.io's written reviews are positive against 52% of Justinmind's, so the app with the better star average is not the one people write more warmly about.
Proto.io ships an update every 4 months, Justinmind every 5 months. The most recent releases landed on October 20, 2026 and October 3, 2026 respectively.
| Parameter | Proto.io | Justinmind |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (6 ratings) — better | 3.3 (15 ratings) |
| Positive reviews | 41.9% of reviews | 52.4% of reviews — better |
| Number of ratings | 6 | 15 — better |
| Update frequency | Every 4 months — better | Every 5 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 10.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 34 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Proto.io | Justinmind |
Customer experience
Proto.io
Justinmind
Bugs and requests
Proto.io
Reported bugs
37 issues- Can't login
- Difficult to delete account
- Share link issues
- Login issues
- Cannot sign up or sign in
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- VR Prototyping is broken
- App doesn't work at all
- Blank screen
- Super buggy on iOS
- Entire preview offset
- Projects broken on iPad
- Videos & transitions won't load on iPad
- On Device is broken iPhone and iPad
- Black screen permanently on device
- Crashes when downloading project
- Doesn't show prototypes on iOS 10
- Bug keeps closing the app
- Crashing on iOS10
- Crashes constantly
- Crashes after trying to open a project
- Crashing after sign in page
- Not flawless
- Need to fix some bugs
- Requires account creation to view
- Bad update
- Does not install on iOS 7
- App does not open, crashes immediately
- Totally broken, doesn't load on phone
- Can't get passed loading screen
- System runs slow
- Piece of crap app cost me a grade
- Won't load anything
- Newest update broke sign-in
- Very buggy app
- Crashing or not loading larger elements
- Gets stuck when loading prototype
- App has potential but is still buggy
Requested features
4 requests- Update UI elements for iOS 13
- Caching projects
- Optimise application for iPhone 6 screen
- Easily switch between accounts like Tweetbot
Justinmind
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Proto.io
No in-app purchases
Justinmind
No in-app purchases
