Build the models that shape decisions. In Excel.
River is an Add-In that extends Excel with a structured modeling engine.
Models you can trust, decisions you can defend
River turns Excel into a structured modeling engine. Logic is defined in an auditable, visual model map instead of across long formula chains. The result: models you can share, explain, and stand behind.
Keep Excel. Gain real analytics power.
No migration, no new language to learn. River works inside your existing workbooks. It handles multi-dimensional data, large datasets, and complex calculations at speeds native Excel can't match. Your stakeholders get a workbook, they just need to install the Add-In.
Publish your model as a live website in minutes
River exports your model as a self-contained calculation engine. Pair it with Claude to build an interactive front-end: visitors change inputs, results update instantly, no Excel required. No recoding, no drift between your model and the web tool, and every model update carries through automatically.
Your most productive modeling
Our easy user interface and high-performance engine allow you to focus on content.
+50%
Productivity
The user interface focuses on automating configuration while keeping you in control.
25x
Less risk of error
River gets rid of formulas and checks configuration and data for you, which dramatically reduces errors.
140x
Faster than Excel alone
River embeds a high performance analytical engine in Excel, allowing datasets of more than 1 million rows with steady calculation speeed.
Get started with River
Install the trial version and test it for 14 days or let us walk you through a demo.
How to start using River?
River is fully contained in an Excel Add-In, making installation easy
1
Get a free licence
No credit card needed.
2
Install the Excel Add-In
Download the installer and follow the instructions.
3
Start modeling
Open Excel and start building models right there! Our in-tool tutorials will help you get started.
4
Share your models
Simply share your models as any Excel workbook, by email or in a shared folder.
Try the River Add-In today.
Designed by former McKinsey consultants
Based on decades of observing the same problems, we've built River to help business analysts, modeling experts and consultants have a more satisfying modeling experience and elevate the quality level in the profession.
Frequently asked questions
Of course! It is strongly encouraged. River models are saved inside the Excel workbook together with the data it uses, making sharing very easy.
You currently need a license to be able to view the model in a workbook, but we're designing a "viewer" version that will allow people without a license to open the model in read-only mode.
If you just want to keep the model for reference, no need to do anything. When your current River license expires, you will always be able to open the Excel workbook and see the input and output data of your model. With the "viewer" version of River, you will also be able to see all the modeling logic and its parameters.
If you want to recreate your model using plain Excel (or another tool), you can use it as a guide during your rebuild.
We come from the consulting industry, where protection of client data is a top priority.
Therefore we designed River so that it runs entirely on your computer, and no data from your workbook is ever leaving.
The only data that River can send is application usage data, to help us build the product. And you can decline this option.
River has been carefully designed to have the smallest possible footprint.
It is packaged in a single Excel Add-In, doesn't send data outside your computer and can be deployed using corporate IT tools.
If you already use think-cell (another popular Add-In), chances are your IT will easily approve it. Otherwise feel free to contact us at info@river-solutions.com.
We have an extensive in-application documentation and tutorials.
We currently provide support via email directly.
Want to know more? Get in touch!
Supported by
Fondation Genevoise pour l'Innovation Technologique
River has been awarded Innovation Initiation Support by FONGIT