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Calda🐙 is an award-winning mobile and web app development studio and the #1 FlutterFlow Agency of the Year (2025). We design and build high-quality, scalable applications for startups and established companies across the USA, Europe, and the UAE. 

We don’t just move fast—we build with precision: clean architecture, reliable backends, and products users genuinely enjoy.

Our Work

  • Min project size
    $10,000+
  • Hourly rate
    $50 - $99 / hr
  • Employees
    10 - 49
  • Locations
    Ljubljana, Slovenia
  • Year founded
    Founded 2022

1 Locations

  • Ljubljana , Slovenia

No have been added yet...

    Pricing Snapshot

    Min. project size $10,000+
    Avg. hourly rate $50 - $99 /hr
    Rating for cost 4.9 /5

    What Clients Have Said

    Calda is praised for their good value and budget-friendly pricing, delivering quality MVPs and apps across various sectors. Clients consistently highlight their responsiveness and commitment, with projects ranging from mobile apps to complex backend systems, all completed on time and within budget.

    This summary is based on verified Clutch reviews.

    Most Common Project Size

    $10,000 - $49,999 based on 10 reviews
    < $10,000 $10,000 - $49,999 $50,000 - $199,999 > $200,000

    Select a service to see pricing information

    Highly Rated Similar Providers

    Calda Review Insights

    Overall Review Rating

    4.9
    • Quality 4.9
    • Schedule 4.7
    • Cost 4.9
    • Willing to Refer 4.9

    Top Mentions

    Review Highlights

    • Areas for Improvement in Communication Details

      While communication is generally praised, one client mentioned that the level of detail in communication could be improved, possibly due to language barriers. This suggests an area where Calda could enhance clarity.

    • Expertise in App Development

      Calda is consistently praised for its proficiency in developing mobile apps, utilizing tools like FlutterFlow and Supabase. Clients from various industries appreciate their technical skills and ability to deliver functional MVPs tailored to client needs.

    • Commitment to Quality and Deadlines

      Calda is recognized for its dedication to quality and meeting tight deadlines. Clients often note their hard work and commitment to delivering high-quality products under pressure, including working long hours when necessary.

    • Creative and Collaborative Approach

      Clients appreciate Calda's creative input and their collaborative approach to projects, often going beyond initial expectations to improve design and functionality. Their enthusiasm and partnership mindset are frequently highlighted.

    • Excellent Communication Skills

      Calda is commended for maintaining clear and frequent communication with clients. They utilize virtual meetings, emails, and messaging apps to keep clients informed and engaged throughout the project lifecycle.

    • Strong Project Management

      Calda's project management is highly regarded, with clients noting their responsiveness, timely delivery, and structured communication. Many clients highlighted their ability to meet deadlines and adapt to evolving project needs effectively.

    Calda Reviews

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    Mobile App Dev & UX/UI Design for Sports Technology Company

    • Custom Software Development Mobile App Development UX/UI Design
    • $10,000 to $49,999
    • Nov. 2024 - Feb. 2025
    5.0
    Quality
    5.0
    Schedule
    5.0
    Cost
    5.0
    Willing to Refer
    5.0

    "They communicated daily and were available at almost any time to deal with changes."

    Feb 7, 2025
    Co-Founder, Sports Technology Company
    Matthew Tabor
    • Sports
    • Houston, Texas
    • 1-10 Employees
    • Online Review

    Calda designed and developed the initial version of a sports technology company's mobile app.

    Low Code Mobile App Dev & Design for Social Media Startup

    • Low/No Code Development Mobile App Development UX/UI Design
    • Confidential
    • Mar. - Oct. 2024
    5.0
    Quality
    5.0
    Schedule
    5.0
    Cost
    5.0
    Willing to Refer
    5.0

    "They understood our vision and made a significant contribution to refining our concept."

    Nov 3, 2024
    Co-Founder, CRW
    Joshua Rex
    Verified
    • Other industries
    • Australia
    • 1-10 Employees
    • Online Review
    • Verified

    Calda developed and designed a mobile app for a social media startup. The team built the app for Android and iOS, performed low-code and custom-code development, and integrated several APIs.

    Social Media App Dev for Bio-Pesticides Company

    • Custom Software Development Graphic Design
    • Confidential
    • Oct. 2023 - Aug. 2024
    5.0
    Quality
    5.0
    Schedule
    5.0
    Cost
    5.0
    Willing to Refer
    5.0

    "Their collaborative culture and emphasis on continuous improvement fostered a dynamic and motivating environment."

    Aug 2, 2024
    President, Atomes Bio
    Dori Dagher
    • Other industries
    • Montreal, Quebec
    • 51-200 Employees
    • Online Review

    A bio-pesticides company hired Calda to build a social media app from scratch. The team also worked on building a geo-location feature.

    Mobile App Development for Nonprofit Organization

    • Mobile App Development
    • $10,000 to $49,999
    • Feb. - July 2024
    5.0
    Quality
    5.0
    Schedule
    5.0
    Cost
    5.0
    Willing to Refer
    5.0

    "Calda's proficiency in engineering custom-built apps helped propel our nonprofit to the forefront in the personal, professional, and spiritual leadership development sector."

    Jul 9, 2024
    Executive, ChaplainCare LLC
    Anonymous
    Verified
    • Other industries
    • Arlington, Tennessee
    • 1-10 Employees
    • Online Review
    • Verified

    Calda provided engineering and backend support for a nonprofit organization's mobile app. Their work involved data modeling, UI/UX modifications, database setup, FlutterFlow development, and testing.

    Mobile App Development for Medical Platform

    • Mobile App Development
    • Confidential
    • Jan. - Nov. 2023
    5.0
    Quality
    4.0
    Schedule
    5.0
    Cost
    4.0
    Willing to Refer
    5.0
    "Calda always took the time to troubleshoot and explain issues to us in person if needed. We never felt left alone."
    Nov 7, 2023
    Co-Founder & CPTO, Medical Platform
    Thanh Schrader-Nguyen
    Verified
    • Medical
    • Berlin, Germany
    • 1-10 Employees
    • Online Review
    • Verified

    A medical platform hired Calda to build their MVP. The team maintained an alpha app based on BravoStudio and Xano, working on frontend development, testing, database formation, and more.

    Figma App Design for Shark Forecasting Platform

    • Mobile App Development UX/UI Design
    • Less than $10,000
    • June - July 2023
    5.0
    Quality
    5.0
    Schedule
    5.0
    Cost
    5.0
    Willing to Refer
    5.0

    "Their experience, quality work, and willingness to help were highly appreciated."

    Jul 26, 2023
    Founder, SafeWaters.AI
    Evan Valenti
    Verified
    • Other industries
    • Boston, Massachusetts
    • 1-10 Employees
    • Online Review
    • Verified

    Calda was hired to improve the Figma-based designs of a shark forecasting platform. The team modernized the designs to match Apple and Google's requirements and provided further development support.

    UI/UX Design & Mobile App Development for E-Commerce Company

    • Custom Software Development Mobile App Development UX/UI Design Web Development
    • Confidential
    • June - July 2023
    5.0
    Quality
    5.0
    Schedule
    5.0
    Cost
    5.0
    Willing to Refer
    5.0

    "Calda's service was perfect."

    Jul 12, 2023
    CEO, E-Commerce Company
    Anonymous
    • eCommerce
    • Paris, France
    • 1-10 Employees
    • Online Review

    Calda provided development services for an e-commerce company. The team created a customer portal management system on the client's mobile application.

    Mobile App Dev for Museum

    • Application Testing Custom Software Development Mobile App Development Other Application Development
    • Confidential
    • Feb. - June 2023
    5.0
    Quality
    5.0
    Schedule
    5.0
    Cost
    5.0
    Willing to Refer
    5.0

    "They worked very fast and were very responsive to any changes needed."

    Jun 8, 2023
    CEO, MuseMuse.app
    Kimberley Puchois
    Verified
    • Education
    • London, England
    • 1-10 Employees
    • Online Review
    • Verified

    Calda provided web development services for the museum. They built an MVP version of a cross-museum guide app, including UX design, Figma database structure, API bridge structure, and data binding.

    Mobile App Dev for Shelter Locator App

    • Custom Software Development Mobile App Development UX/UI Design
    • Confidential
    • May - Aug. 2022
    4.5
    Quality
    5.0
    Schedule
    3.0
    Cost
    3.5
    Willing to Refer
    4.5

    "I was impressed with their ability to get the job done."

    May 17, 2023
    Founder & CEO, Shelter Locator App
    Anonymous
    Verified
    • Other industries
    • Oklahoma City, Oklahoma
    • Online Review
    • Verified

    Calda was hired to build a mobile application from scratch. The app provided users with a list of nearby locations that offer shelter during a natural disaster.

    Mobile App Development for PropTech Startup

    • Mobile App Development
    • Confidential
    • Nov. 2023 - Ongoing
    4.5
    Quality
    4.0
    Schedule
    4.5
    Cost
    5.0
    Willing to Refer
    5.0

    "They'll find a solution whenever a problem occurs."

    Apr 6, 2023
    Co-Founder, PropTech Startup
    Anonymous
    Verified
    • Real estate
    • Antwerpen, Belgium
    • 1-10 Employees
    • Online Review
    • Verified

    Calda has developed a native mobile app's MVP for a proptech startup. The team has also set up the app's database endpoints, published the app on app stores, and carried out testing.

    Showing 11-20 of 22 Reviews

    Locations (1)

    Gospodinjska ulica 8 LjubljanaSlovenia 1000

    16 - 20

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