Fontics vs Operis OAK
OAK comes from Operis, a firm that audits financial models for project finance, infrastructure and regulated sectors. It is built for formal model review. Fontics is built for deal teams that review a model and then analyze it, on any platform.
Last reviewed by Admin.
Facts about Operis OAK come from Operis's public pages and other public sources, listed under Sources. Prices are list prices as of the review date.
Short answer
- OAK is a dedicated model-review toolkit: 30+ tools to map a model, compare versions, summarize structure, check named ranges, explore formulas, reconstruct a formula down to its inputs and test against best practice.
- It is an Excel add-in priced at £311.66 per year, with a 30-day free trial, and its install guidance is for Windows.
- Fontics covers formula audits and deep traces, then goes further into analysis: scenario sets, tornado charts, break-evens, solvers, Monte Carlo and valuation reviews, on Windows, Mac and Google Sheets.
you do formal model audit or review: comparing versions, reconstructing formulas, and checking a model against best-practice standards.
you review a model so you can rely on it, then need to stress-test it: audits and traces plus scenarios, sensitivities and valuation checks.
At a glance
What each tool is built to do. A dot means it can be done, but you prompt for it or set it up yourself each time.
| Stage | Job | Operis OAK | Fontics |
|---|---|---|---|
| Build | Build a model from scratch | No | No |
| Write and fix formulas | PartlyExcel utilities and shortcuts | No | |
| Data wrangling, pivots, charts | No | No | |
| Plain-language questions | No | No | |
| Analyze | Scenario analysis | Not listed | Yes10+ scenarios in a minute |
| Sensitivity and tornado charts | Not listed | YesRank drivers in seconds | |
| Stress tests and break-evens | Not listed | Yes | |
| Multi-driver goal seek and solvers | Not listed | Yes | |
| Monte Carlo simulation | Not listed | Yes1,000+ runs, add-on from $5/month | |
| Review | Valuation review (DCF/LBO drivers, DLOM, Black-Scholes) | No | Yes |
| Formula audit | YesModel map, review issues, best practice | Yes | |
| Deep precedent and dependent traces | YesFormula Explorer, OAK Reconstruct | Yes | |
| Compare two model versions | Yes | NoNot the focus | |
| Best-practice compliance checks | Yes | Partly | |
| Platform | Same answer every run | Yes | YesAI-free |
| Excel for Mac | NoWindows install guidance | Yes | |
| Google Sheets | No | YesSame plan |
Side by side
| Fact | Operis OAK | Fontics |
|---|---|---|
| What it is | Operis Analysis Kit, an Excel add-in with 30+ tools for building and reviewing spreadsheet models, from the model-audit firm Operis.[1][2] | An AI-free Excel and Google Sheets add-in that runs analysis (scenarios, sensitivities, stress tests, solvers, Monte Carlo) and reviews models (formula audits, deep traces, valuation reviews) for investment, credit and valuation teams. |
| Review tools | Mapping a model, comparing model versions, summarizing a model, named ranges, review issues, Formula Explorer, best-practice compliance, Excel utilities and shortcuts.[1] | Formula audits, special-cell highlighting, deep precedent and dependent traces, valuation reviews. |
| Formula reconstruction | OAK Reconstruct rebuilds a formula to show its precedents and dependents down to the inputs.[1] | Deep traces follow an output back to its inputs across sheets. |
| Analysis | Not a focus: no scenario-set, tornado, goal-seek or Monte Carlo modules listed.[1] | Scenario sets, tornado charts, data tables, break-evens, multi-driver goal seek, Monte Carlo, football fields. |
| Platforms | Made for Microsoft Excel; installation guidance refers to Windows. Google Sheets not supported.[1] | Excel on Windows and Mac, and Google Sheets. One plan covers both. |
| AI | None. | AI-free and 100% deterministic: same inputs, same answer, every time. |
| Trial | 30-day free trial.[1][2] | Free Core plan, no time limit. |
| Price | £311.66 per year (+ tax), annual subscription.[2] | Free Core plan; paid plans $20 and $50/month; Monte Carlo add-on from $5/month |
Choose Operis OAK if
- You audit or review models formally, for lenders, sponsors or regulators.
- You need to compare two versions of a model and see exactly what changed.
- You want to reconstruct complex formulas and check a model against best-practice standards.
- You value tools built by a firm whose core business is model audit.
What Operis OAK does well
- Built by practising model auditors, with a model-audit methodology behind it.
- Version comparison and formula reconstruction.
- Best-practice compliance checks and model summaries.
- Won a Financial Modelling Innovation Award (2020).
Choose Fontics if
- You check a model so you can rely on it, then need to run scenarios, sensitivities and break-evens on it.
- You review valuations: DCF and LBO drivers, DLOM, Black-Scholes.
- Your team uses Mac or Google Sheets.
- You want monthly billing or a free plan.
Where Fontics is not the right tool
- Fontics does not compare two versions of a workbook or score a model against a modelling standard.
- For a formal, signed-off model audit, use a specialist tool or firm.
What Operis OAK does well
- Built by practising model auditors, with a model-audit methodology behind it.
- Version comparison and formula reconstruction.
- Best-practice compliance checks and model summaries.
- Won a Financial Modelling Innovation Award (2020).
Where Fontics is not the right tool
- Fontics does not compare two versions of a workbook or score a model against a modelling standard.
- For a formal, signed-off model audit, use a specialist tool or firm.
Using Operis OAK and Fontics together
OAK for the formal review, Fontics for the analysis that follows.
- 01
Review with OAK
Map the model, compare it with the previous version and reconstruct the key formulas.
- 02
Trace key outputs with Fontics
Run deep traces on IRR, DSCR or equity value and highlight special cells before you analyze.
- 03
Stress-test with Fontics
Run scenarios, a tornado chart, DSCR break-evens and Monte Carlo for the credit or IC paper.
Who uses each
Operis OAK
Project finance, infrastructure, energy and regulated-sector modellers, auditors and lenders. Operis shows logos including Barclays, HSBC, CIBC, Investec, BDO, Engie, Hochtief, Sonnedix, Ofgem and the UK National Audit Office.[1]
Fontics
Investment, credit and valuation teams at funds, banks, lenders and advisors. They run DCF, LBO, project finance and real estate models and need to defend the numbers in front of an investment or credit committee.
Pricing
Fontics
- Core is free forever, Transactions is $20/month and Institutional is $50/month.
- Monte Carlo is an add-on from $5/month ($5 on Core, $10 on Transactions and Institutional).
- Every plan covers Excel and Google Sheets.
FAQ
Is Fontics a model audit tool like OAK?
Partly. Fontics has formula audits, special-cell highlighting and deep traces, but it does not compare model versions or score a model against a standard. Its main focus is analysis and review for deal teams.
Can I use OAK and Fontics together?
Yes. They are separate add-ins. Review the model with OAK, then trace key outputs and stress-test them with Fontics.
Does OAK work on Mac or Google Sheets?
OAK is made for Microsoft Excel and its installation guidance refers to Windows. Fontics works in Excel on Windows and Mac and in Google Sheets.
Does OAK run scenarios or Monte Carlo?
These are not listed among OAK's tools. Fontics has scenario, sensitivity, goal-seek and Monte Carlo modules.
How does pricing compare?
OAK is £311.66 per year. Fontics Core is free; Transactions is $20/month and Institutional $50/month, with Monte Carlo from $5/month.
Sources
- 1.Operis Analysis Kit, Home and features · modified 21 Nov 2025
- 2.Operis Analysis Kit, Price
Vendor features and prices change often. If something here is out of date, tell us and we will correct it. Product names are trademarks of their owners; Fontics is not affiliated with them.
Run your first sensitivity before lunch.
Excel and Google Sheets