HOAI-Calculator

Clear inputs, instant results

Guided input helps you quickly review and compare different calculation options

HOAI-Calculator for iPhone & iPad.

Fast. Clear. Built for engineers.

Calculates HOAI fee bases in a structured, transparent and documented way – ideal for everyday planning practice.

Fee calculation according to the German HOAI regulation

✓ Instant results

✓ Clear overview of service phases

✓ Save projects (Pro)

✓ PDF export (Pro)

✓ iCloud Sync (Pro)

One-time purchase – unlock Pro permanently. No subscriptions, no recurring fees.

Less calculation. More clarity. Better decisions.

Service phases clearly structured

Amounts per service phase at a glance – ideal for coordination and quotations.

The HOAI Calculator helps you quickly estimate fees and delivers clear results – without complex tables or unnecessary steps.

A4-PDF-Export (Pro)

Clean output for project files, sharing and documentation.

Features

Focus on the essentials: fast input, transparent logic and clear results.

Free

Fee estimate in seconds

Structured inputs guide you quickly to the result – ideal for preliminary checks, comparing variants and quick coordination.

Quick comparison of multiple scenarios

Clear presentation of calculation steps

Logical and transparent results

Free

Service phases at a glance

Fees and distribution per service phase at a glance – ideal for internal coordination and project planning.

Clear service phase table

Instant updates on changes

Clean results without clutter

Pro

A4 PDF export (Pro)

Export a clean A4 PDF for project files, sharing and documentation.

Clean and consistent layout

Single-page layout with clean margins and footer

Share directly or save to your files

Pro

Project management (Pro)

Save, duplicate and archive multiple projects – ideal for ongoing projects and comparing variants.

Project overview with status

Duplicate projects for variants

Project archive for completed projects

Pro

Custom presets & PDF branding (Pro)

Create custom presets for recurring cases – with optional PDF branding.

Presets for recurring inputs

Consistent team-wide presentation

Professional PDF output

A simple model: try it for free or unlock Pro permanently with a one-time purchase.

Free

Free to use

Perfect for getting started with the basic features.

Basic calculation & results overview

Service phases overview

No PDF export

No project management

Use for free

Great for testing and quick overviews.

Pro – One-time purchase

7,99€

One-time purchase – no subscriptions, no recurring fees.

Clean A4 PDF export

Project management (save, duplicate and archive)

Branding & Presets

Future Pro updates included

Any questions?

One-time purchase. Permanently unlocked.

FAQ

Clear and concise answers.

Who is the HOAI Calculator for?

For planners, engineers, architects and project managers who need quick clarity.

Whether for preliminary checks, comparing variants or internal coordination – the HOAI Calculator brings structure to your fee calculations.

Does the app replace a formally verifiable fee calculation?

No. The app is intended for orientation and structured fee estimation.

A formally verifiable fee calculation must always be prepared individually based on the contractual agreements and the applicable regulations

Is there a subscription?

No. The HOAI Calculator uses a one-time purchase model.

You can try the basic features for free and unlock Pro permanently with a one-time purchase – no subscriptions, no recurring fees.

What is included in Pro?

With Pro you get:

• Clean A4 PDF export

• Project management (save, duplicate and archive projects)

• Custom presets for recurring cases

• Optional PDF branding

• All future Pro updates included

More control. More structure. More professionalism.

On which devices does the app run?

The HOAI Calculator runs on iPhone and iPad.

It is optimized for modern iOS devices and can be used both in the office and on the go.

Where is data stored?

Your data is generally stored locally on your device.

If iCloud sync is enabled, projects, settings, and presets are additionally synchronized via iCloud between your own devices. No user profiles are created, and no data is transferred to the provider’s own external servers.

Can I share the results?

Yes. You can export the results as a clean A4 PDF and share or save them directly.

Is there a user guide?

Yes.

Here you can find the full user guide for the HOAI Calculator, including all functions, settings, and explanations.

How can I contact support?

Just send an email to: support@schellolabs.de

Direct. Personal. No ticket system bureaucracy.

Start with the HOAI Calculator now.

Try it for free. Unlock Pro with a one-time purchase – no subscription, no recurring fees.

APPS MADE IN PETERSFEHN - GERMANY

HOAI-Calculator for iPhone & iPad.

Fast. Clear. Built for engineers.

Less calculation. More clarity. Better decisions.

Features

Fee estimate in seconds

Service phases at a glance

A4 PDF export (Pro)

Project management (Pro)

Custom presets & PDF branding (Pro)

Prices

FAQ