Who wrote this comparison.
OverFuture wrote this comparison. We are a software company in Zaragoza ourselves, so we do the same work as the firms below and we do not score ourselves. You will find our details in the ‘About us’ box after the company profiles. No company paid to appear. We last checked every source on 10 November 2026.
How we scored each company.
A company qualifies if it writes custom software for other businesses and its registered address is in the city of Zaragoza. Management systems, internal tools and online platforms all count.
Resellers that only install an off-the-shelf package are left out. For each firm we checked at least four facts on its own website, with a quote and a link.
| Criterion | Weight | How we check it |
|---|---|---|
| Custom software as a stated service | 25 | The services listed on its website |
| Address in Zaragoza | 20 | Legal notice, privacy policy or contact page |
| Track record | 20 | Founding year, start date or years in business published by the company itself, not by its team or its founder. A Commercial Register date is given as a fact, without points. 20 points for 20 years or more, 15 for 10 to 19, 10 for 5 to 9, 5 for fewer and 0 with no figure |
| Case studies with their own page | 20 | Software projects for clients with a dedicated page and a description; a product of its own does not count. 20 points for two or more, 10 for one and 0 for none |
Public reviews will add 15 points from the February 2027 review. Until then the maximum is 85, and tied companies appear in alphabetical order.
Sources and interest. We used each company’s own website, checked on 10 November 2026. OverFuture also offers custom software development in Zaragoza, which is why it is not ranked.
Results.
| # | Company | What it builds | Address | Stated track record | Case studies with own page | Points |
|---|---|---|---|---|---|---|
| 1 | IDA | Custom software and ERP integrations | C/ Isla de Menorca 1 (50014) | 25+ years | None | 65 |
| 2 | SweetCode | Custom CRM, ERP and management apps | Calle Portugal 38 (50010) | No year published | Ábora CRM and App Etiquetas Saphir | 65 |
| 3 | Zonsai | Custom web management apps | Av. Pablo Gargallo 98 (50003) | No year published | DPZ fire stations and Abora Solar | 65 |
| 4 | Calat | Custom software, including for PLCs | Plaza Ortilla 3 (50018) | 15+ years | None | 60 |
| 5 | DLC Digital | Custom management apps and automation | Gran Vía 41 (50006) | No year published | None (Pleia is its own product) | 45 |
Company profiles.
IDA. Integración y Desarrollo de Aplicaciones is based on Calle Isla de Menorca. It writes custom software and connects it to the ERP each company already runs. It states more than 25 years installing and developing management software in Zaragoza. We found no software case study with its own page, so it scores 0 on that criterion.
SweetCode. A programming team based on Calle Portugal. Before it writes a CRM, an ERP or a management app, it studies how the client company actually works. It says its people bring more than 20 years of programming experience, but it does not publish the company’s own year, so it scores 0 for track record. Its case studies include Ábora CRM, built under Zonsai’s technical lead, and a warehouse order app for Saphir.
Zonsai. Zonsai IT Solutions has its registered address on Avenida Pablo Gargallo. It builds custom web management apps that automate tasks and connect systems. Its management team states more than 10 years in the web sector, a figure that does not count towards track record. One of its dedicated case pages covers the fire-station software of the Zaragoza Provincial Council. Another shows the website and management apps it built for Abora Solar.
Calat. Calat Sistemas y Comunicaciones works from Plaza Ortilla. It writes custom software, including programs for programmable logic controllers (PLCs). It presents itself with more than 15 years in IT. Its website shows no software project with a dedicated page.
DLC Digital. Registered in the Zaragoza Commercial Register, with its address on Gran Vía. It builds custom management apps and automations for small businesses. It does not publish the year it started. Its founder states more than 6 years at other companies before starting it, a figure that does not count towards track record. Pleia, the cloud invoicing platform with its own page on its website, is a product of its own and does not count as a client case. Its client work is described by project type, without a page per client, so it scores 0 for case studies.
How to choose a software company in Zaragoza.
- Write down the process you want to fix and who will use the software every day.
- Ask for a similar project with its own page, and ask which part the company built.
- Check that the quote keeps development and maintenance apart.
- Ask which technology they use and who could carry on the work later.
- Agree whether the code and the data will be in your name.
Not sure whether you need custom software at all? Our guide to what custom software costs (in Spanish) explains what drives the price. Outside Zaragoza, see the best software development companies in Spain and in Barcelona.
Frequently asked questions.
In this review we scored, in this order, IDA, SweetCode, Zonsai, Calat and DLC Digital. All five have their address in the city of Zaragoza.
Because they do not publish the year they started on their websites. We only count the company’s own years, not those of its team or its founder. The same rule applies to all our comparisons.
Because we also build custom software in Zaragoza and compete with these firms. Our details sit in the ‘About us’ box, outside the ranking.
Yes. The Spanish version has the same companies, scores and sources.
Related projects.
Real OverFuture work in this field. The project pages are in Spanish.
