Comparison

OPUS Architecture & Design vs Fabius

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

Head to head
About

OPUS Architecture & Design

Easily track project progress on the go with this comprehensive tool. Access all project information, including messaging, photo sharing, file management, and appointment planning, in one convenient application. Stay informed and manage your projects with clarity and serenity.

Highlights
  • Real-time project progress tracking
  • Integrated messaging
  • Photo sharing
  • File management
  • Appointment planning
  • Centralized project information
Features
Read full description

Following your project has never been this easy. With OPUS, take it with you wherever you go and keep on easily with its progress. Access all your project's information in one app. Start following its journey in real-time using a well-tailored tool conceived for you and your project. All the tools needed for an optimal monitoring such as messaging, photo sharing, file management, and appointment planning, have been reinvented to serve beyond your ambitions. With OPUS, discover a new way to follow your project, in clarity and serenity. We do our utmost to satisfy your wish to monitor, under the best conditions, the project that drives you. Therefore, we partner with the agency responsible of your project, to enable you to rediscover the follow-up of your project.

About

Fabius

Read full description

Fabius lets you create your own AI agents and put them to work. DESIGN YOUR AGENTS Give each agent its own personality, instructions, model, and tools. A research assistant, a writing partner, a support bot — you decide what each one knows and what it is allowed to do. BRING YOUR KNOWLEDGE Upload documents and images, and your agents use them to give grounded, specific answers. WORK AS A TEAM Invite people to your workspace, give them a role, and choose who pays. CONNECT YOUR CHANNELS Link a Telegram bot and your agent answers there too. PRIVATE BY DESIGN No ads, no analytics, no tracking. Your conversations belong to you, and you can delete your account — and everything with it — anytime, right from Settings.

Screenshots

OPUS Architecture & Design4 screens
Fabius4 screens

Verdict

The call

The clearest difference is in-app purchases: OPUS Architecture & Design at none against Fabius's 3. Fabius's advantage is update cadence (every 9 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. Fabius sells 3 one-off in-app purchases. OPUS Architecture & Design asks for nothing beyond the download.

UpkeepUpdate frequency

OPUS Architecture & Design ships an update every 2 weeks, Fabius every 9 days. Both last shipped on October 24, 2026.

Scorecard2 real differences · 8 level
OPUS Architecture & Design versus Fabius: the parameters behind the verdict, then further details
ParameterOPUS Architecture & DesignFabius
PriceFreeFree
Rating—5.0 (1 ratings) — better
Positive reviews100.0% of reviews—
Number of ratings—1 — better
Update frequencyEvery 2 weeksEvery 9 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.1 — better16.4
Further details — not scored
Size64 MB69 MB
Age rating4+12+
DeveloperOPUS, Inc.Subhi Mukbel

Customer experience

OPUS Architecture & Design

Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Fabius

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

OPUS Architecture & Design

No in-app purchases

3 purchases

Fabius

One-time3
  • 1,400 Credits$4.99
  • 6,200 Credits$19.99
  • 17,000 Credits$49.99

Questions

Is OPUS Architecture & Design free?
OPUS Architecture & Design is free to download, with no in-app purchases.
Is Fabius free?
Fabius is free to download, with in-app purchases available.
Do OPUS Architecture & Design or Fabius have ads?
Neither OPUS Architecture & Design nor Fabius shows ads.
Which is updated more often, OPUS Architecture & Design or Fabius?
OPUS Architecture & Design ships an update every 2 weeks, and Fabius every 9 days. Most recently, OPUS Architecture & Design was updated on October 24, 2026 and Fabius on October 24, 2026.

Other comparisons