OS/ Agentursoftware
6.3/10Cloud agency ERP from Berlin-based 314 OS GmbH. It covers project costing, budget controlling, time tracking, invoicing and DATEV handoff for agencies and project-based firms.
Data last updated November 2026 · Our methodology
Overview
OS/ is an agency ERP made by 314 OS GmbH in Berlin. It grew out of the agency Parasol Island, which drew on more than 20 years of running its own agency business. The software follows each project from quote to final invoice. Quotes are built by drag and drop from service catalogues and client price lists. Budgets are then compared with actual costs in real time, including true labour costs. A forecast report presents project business in a format close to the German BWA business analysis. On the finance side it creates advance, partial, final and time-based invoices, supports e-invoicing and ZUGFeRD, reads incoming supplier invoices by OCR, and routes them for approval. Approved invoice data goes straight to DATEV for the tax advisor. It suits German-speaking agencies, studios and consultancies that want project profitability control rather than a full general ledger. Pricing is a flat monthly fee with unlimited users. Plans are limited by the number of active project managers: Premium allows 5, Business 10 and Growth 15. Annual billing costs 199, 299 or 399 euros a month, and monthly billing is 100 euros a month higher per plan. Enterprise is quoted on request. Integrations include DATEV, Pleo, Qonto, Personio, awork, Clockodo, Slack, Asana, monday, Google Workspace and Microsoft 365. The main limitation is that OS/ is not an accounting system. Bookkeeping, payroll and tax filing stay in DATEV or with a tax advisor. Reviewers also say setup takes time and that reporting could be more flexible.
Our Rating
Finance Software6.4/10
Project Management6.3/10
Who OS/ Agentursoftware is best for
Best software for AgenciesGood fit
It was built by an agency, specifically for agency project costing and controlling.
The vendor names consultancies as a target, and the software is built around project-based billing.
Less suited
The entry plan costs 199 euros a month on annual billing, which is steep for very small teams.
The flat agency pricing and project-manager limits are a poor fit for solo workers.
Pros & Cons
Pros
- Users are unlimited on every plan, and only active project managers count toward the plan limit.
- Live budget-versus-actual controlling per project, including true labour costs, gives agencies a view of profitability.
- The DATEV integration sends approved invoice data straight to the tax advisor without manual exports.
- OMR reviewers rate support highly (96 percent), and the vendor says chat replies come within minutes.
- It supports GoBD compliance, e-invoicing and ZUGFeRD, and is hosted in Germany on AWS.
Cons
- It is not a full accounting system: there is no general ledger, payroll or tax filing.
- The entry price of 199 euros a month on annual billing is high for small studios.
- Reviewers say setup and getting familiar with the software take time.
- Some reviewers want more flexible reports and dashboards, and better contact import and export.
- Most information is in German, and the product is focused on the DACH market.
Key Features
OS/ Agentursoftware Pricing
Premium
or €2,388/year (save 33%)
- Unlimited users
- All integrations
- OS/ AI early access
- Up to 100 GB storage
- Free in-app chat support
- Secure project file transfer
- Up to 5 active project managers
- Free setup and remote onboarding
- Salary and service cost benchmarking
Business
or €3,588/year (save 25%)
- Custom branding
- Everything in Premium
- Advanced global benchmarking
- Email invoice inbox with OCR
- Up to 10 active project managers
- Overhead reporting and variable overhead cost factor
Growth
or €4,788/year (save 20%)
- Multi-entity
- Custom fields
- Everything in Business
- Dedicated account manager
- Up to 15 active project managers
- OS/ AI automations (announced as coming soon)
Enterprise
- Custom integrations
- User-defined functions
- Workspace consolidation for agency networks
Frequently Asked Questions
Yes. Multi-entity is included in the Growth plan. Enterprise adds workspace consolidation for agency networks.
Yes. There is a free six-week trial with full functionality and support. There is no free plan.
It is a flat monthly fee per plan with unlimited users. Plans are limited by the number of active project managers: Premium allows 5, Business 10 and Growth 15. Annual billing is 100 euros a month cheaper than monthly billing.
Yes. Approved incoming and outgoing invoice data is sent directly to DATEV Online, with cost centres and booking details already filled in.
The vendor says it is GoBD-certified, GDPR-compliant and usable at TISAX-audited companies. Hosting is in Germany on AWS, and SySS GmbH checks security.
Yes. The vendor lists e-invoices and ZUGFeRD support, as well as advance, partial and final invoices.
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