Turn your Excel model into a reliable team asset
The engine that makes models structured, easy to update, and ready to extend
Excel Add-In • Visual logic • Automated checks • High performance • AI-ready

25x
Fewer formula errors
50%
Less time building and auditing
140x
Faster on large lookups
1 file
Model and data, shareable
TRUST YOUR MODEL EVEN IF ITS AUTHOR LEAVES
Build models that are easy to explain and understand
A trusted model clearly exposes its logic, inputs and outputs, assumptions, transformations and parameters. River structures this knowledge and saves it in the model, without formulas.
Easy handovers between modelers keep the knowledge in your team. Experts, clients and managers can review and validate the model smoothly.
- Explore the structure of the model with the visual model map on the left. Zoom out to see the big picture, browse comments, transformations and data connections.
- Visualize parameters of transformations in the configurator window on the right to understand how they work. All visual, no need to decipher formulas.
- Explore data at any point intuitively in Excel Tables to confirm the results match your expectations. Filter, sort, color, cross-check.
- Model documentation is automaticlally created from the model. No need to repeat it. Export as a document or PDF.
KEEP AND REUSE YOUR MODEL INDEFINITELY
Update the model efficiently and with confidence
Refreshing input data, changing assumptions and editing scenarios are typical of a model's lifecycle, often done right before (or during) critical meetings.
River is designed to make all these changes efficiently while keeping confidence in the results. Even modeling logic changes can be done reliably at short notice.
- Update inputs and assumptions without ambiguity: click each yellow and pink block and update the Excel Tables that show automatically.
- Update scenarios in one click. The scenario manager lets you add or update scenarios in one click, without having to touch a formula.
- Detect issues in new data before they affect results. Built-in quality checks automatically run, showing red warning signs e.g. if a value is missing where it shouldn't.
- Change logic without rebuilding the model. The model map lets you swap built-in operators or reroute data with confidence. The error detectors will let you know if something is off.
YOUR MODEL BECOMES AN ASSET TO BUILD ON
Make your model more valuable
Excel models are notoriously difficult to build upon. Logic is encrypted in formulas and locked in the workbook. They are often only used by experienced modelers to produce reports.
River models are portable and open. You can use the model to disseminate insights to more people, in more valuable ways.
Let outsiders play with your model as a web application: the "publish model" button builds a web app with AI that uses your deterministic model. No hallucinations.
Write documentation automatically: export the River as a markdown file, giving AI tools the reliable context it needs to generate a complete Word documentation.
Export logic and data in formats that people, software and AI can reliably use: documents, PDF, Markdown, SQL code, CSV files.
The same model, in Excel and River
Compare a traditional Excel model with the same model built with River.
Logic that is easily written in words can translate into 6-line formulas that are hard to validate, and copied across many cells, increasing the risk of error.


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.
