Comparison

Open MobileUI vs Devmaxx

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Open MobileUI

Access your self-hosted AI assistant on mobile with a smooth, modern, and privacy-focused client. Enjoy native performance, smart synchronization, and a mobile-first interface for productivity on the go.

Highlights
  • Native performance
  • Mobile-first interface
  • Automatic synchronization
  • Image uploads and file attachments
  • System-aware dark mode
  • Secure credential storage
Features
Read full description

Open MobileUI is a professional mobile client for Open WebUI, built to give you convenient access to your self-hosted AI assistant on mobile devices. It delivers a smooth, modern, mobile-first experience with native performance and smart synchronization. Designed for productivity on the go, Open MobileUI helps individuals and teams stay connected to their AI workflows from anywhere. Whether you need quick answers, mobile access to your company AI assistant, or a privacy-focused self-hosted solution, Open MobileUI is built for flexibility and control. Key features: Native performance with smooth animations and responsive touch interactions Clean, intuitive interface designed for mobile-first workflows Automatic synchronization with your Open WebUI instance Image uploads, file attachments, and rich media support System-aware dark mode Intelligent keyboard handling and input optimization Why choose Open MobileUI: Optimized native rendering for a faster and smoother mobile experience Mobile-first design tailored for touch interactions and gestures Secure credential storage and strong authentication support Reliable behavior when connectivity is limited Professional architecture built for stability and maintainability Privacy: Open MobileUI is designed with privacy in mind. Your conversations and data remain on your self-hosted Open WebUI instance. The app does not operate backend services that receive, store, or process your chat content. Open MobileUI brings the power of Open WebUI to a polished mobile experience built for speed, convenience, and privacy.

About

Devmaxx

This app provides a daily system design question to help software engineers master essential skills for interviews and career growth. It offers clear explanations, linked resources, and a private community for learning and practice.

Highlights
  • Daily system design questions
  • Clear explanations and answer breakdowns
  • Linked learning resources
  • Access to previous questions
  • Private developer community
  • Progress tracking
Features
Read full description

System design is becoming one of the most important skills for software engineers. Many companies now require a dedicated system design interview, and your career growth often depends on your ability to design large-scale systems. Devmaxx gives you one focused system design question every day across databases, infrastructure, APIs, theory, and product to help you learn these skills and stay sharp. Each question takes about two minutes, and includes a resource to learn more about the subject. What you’ll get:
 • A new system design question daily
 • Clear explanations for every answer
 • Breakdown of the correct answer
 • Access to previous questions
 • Linked resources to go deeper
 • Access to a private community of developers learning and building the same things as you • Progress tracking to monitor growth If you’re preparing for interviews, this builds daily momentum. If you’re already working as an engineer, this keeps your fundamentals sharp. Open the app. Answer one question. Land the offer. * All features described above require a subscription Terms of Service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Open MobileUI4 screens
Devmaxx4 screens

Verdict

The call

The clearest difference is rating: Devmaxx at 4.3 against Open MobileUI's 2.6. Devmaxx also leads on ratings volume (520 vs 15) and review sentiment (18% vs 0%). Open MobileUI's advantage is in-app purchases (none vs 2) and update cadence (every 5 days vs every 2 weeks). On price, ads, device support and iOS requirement 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Devmaxx sells 2 in-app purchases, starting at $8.99 per month. Open MobileUI asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Devmaxx holds the better App Store score, 4.3 against 2.6. That said, the two scores are not equally well evidenced: Devmaxx has 520 ratings behind it against 15, so its average is the more settled of the two. Written reviews point the same way: 0% of Open MobileUI's written reviews are positive against 18% of Devmaxx's.

UpkeepUpdate frequency

Open MobileUI ships an update every 5 days, Devmaxx every 2 weeks. The most recent releases landed on September 30, 2026 and October 9, 2026 respectively.

Scorecard6 real differences · 4 level
Open MobileUI versus Devmaxx: the parameters behind the verdict, then further details
ParameterOpen MobileUIDevmaxx
PriceFreeFree
Rating2.6 (15 ratings)4.3 (520 ratings) — better
Positive reviews0.0% of reviews18.4% of reviews — better
Number of ratings15520 — better
Update frequencyEvery 5 days — betterEvery 2 weeks
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterSubscription
DevicesiPhoneiPhone, iPad — better
Requires iOS16.4 — better17.5
Further details — not scored
Size67 MB29 MB
Age rating4+12+
DeveloperRonas IT OUArjay McCandless LLC

Customer experience

Open MobileUI

All ratings15 ratings
Positive33.3%
Neutral0.0%
Negative66.7%
Written reviews7 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Devmaxx

All ratings520 ratings
Positive84.0%
Neutral1.0%
Negative15.0%
Written reviews49 reviews
Positive18.4%
Neutral8.2%
Negative73.5%

In-app purchases

None

Open MobileUI

No in-app purchases

2 purchases

Devmaxx

Subscriptions2
  • Monthly Devmaxx Subscription7 Days trial$8.991 Month
  • Annual Devmaxx Subscription7 Days trial$59.991 Year

Questions

Is Open MobileUI free?
Open MobileUI is free to download, with no in-app purchases.
Is Devmaxx free?
Devmaxx is free to download, with in-app purchases available.
Which has better reviews, Open MobileUI or Devmaxx?
Devmaxx is rated higher. Open MobileUI averages 2.6 out of 5 from 15 ratings, while Devmaxx averages 4.3 from 520 ratings.
Do Open MobileUI or Devmaxx have ads?
Neither Open MobileUI nor Devmaxx shows ads.
Which is updated more often, Open MobileUI or Devmaxx?
Open MobileUI ships an update every 5 days, and Devmaxx every 2 weeks. Most recently, Open MobileUI was updated on September 30, 2026 and Devmaxx on October 9, 2026.

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