ChefSolver.com
Conversion tools for cooking and nutrition, multilingual.
Visit →Fidamen — calculator strategy, design and development
Launch a useful calculator before committing to a subscription.
Start with a defined audit or launch sprint. Continue monthly only when you have a recurring roadmap of calculators, widgets or tool improvements.
Fixed-scope entry offers · Production implementation available
Audit, launch, then scale
Audit
Validate the opportunity, formulas, competitive gap and implementation scope.
Launch
Design, build, validate and ship one production-ready calculator or interactive tool.
Continue
Move to the monthly plan only when an ongoing tool roadmap makes it worthwhile.
Selected work
A sample of calculator and interactive-tool platforms we have designed, built and operated. Shown as experience and executed work.
CalcDomain.com
Expert-built free calculators for finance, science, engineering, construction and more, grounded in authoritative sources.
Visit →Calxsolver.com
Free step-by-step math solvers and calculators for algebra, calculus, statistics and linear algebra, running entirely in the browser.
Visit →Cernarus.com
Calculators for economics, finance and data science.
Visit →Calcolo.online
Italian reference for engineering, acoustic and thermal calculations.
Visit →SoCalSolver.com
From budgeting to business planning, SoCalSolver keeps the math quick, clear, and stress-free.
Visit →Start with a defined engagement
Buy a concrete deliverable first. No monthly commitment is required to test the working relationship.
Tool Opportunity Audit
$750–$1,250
For an existing tool or a calculator opportunity you are considering.
- Competitor and search-intent review
- Information-gain and UX diagnosis
- Formula, source and edge-case plan
- Recommended scope and wireframe direction
- Implementation estimate and next-step brief
Fixed scope. Final price depends on domain complexity and available source material.
Calculator Launch Sprint
$2,500–$5,000
For one calculator, embeddable widget or focused interactive tool.
- Defined functional specification
- Interface and interaction design
- Development and responsive implementation
- Formula validation and edge-case QA
- Analytics and embed documentation when required
Fixed project scope agreed before work starts. Open-ended applications are excluded.
Continue with an ongoing tool roadmap
Use the monthly plan after the first delivery when you have recurring calculators, localizations, audits or improvements to ship.
Tool Growth Subscription
$2,500/month
- One website or product
- One active request
- Queue requests in any order
- Typical 3–5 business day delivery
- Revisions included
- Pause or cancel
Full plan details
- One website or product
- One active request at a time
- Queue as many requests as you like — worked one active request at a time, never in parallel
- Revisions included and kept within the active request
- Typical turnaround of 3–5 business days for standard requests
- Implementation through pull requests when applicable
- Pause or cancel anytime
- No recurring meetings
- Availability limited to two founding clients
Best suited to teams with a recurring queue. Limited to two active clients.
Prepaid monthly. No long-term contract. Start with an audit or sprint when the need is currently project-based.
What you can request
- Calculator design
- Calculator development
- Audits of existing tools
- Formula and edge-case validation
- UX improvements
- Embeddable widgets
- White-label tools
- Technical and embed documentation
What is not included?
- Open-ended applications
- Full redesigns
- Complete migrations
- General maintenance of your stack
- Emergencies or 24/7 SLAs
- Guarantees of ranking, traffic or revenue
- Legal, tax or financial advice
FAQ
How many requests are worked on at the same time?
One active request at a time. When it is delivered and any revisions are done, we immediately start the next request in your queue.
What are the delivery times?
Most standard requests are delivered in about 3–5 business days. Turnaround is indicative, not a contractual deadline, and larger or more complex requests take longer.
How are large projects handled?
Large requests are split into smaller milestones that move through the queue one at a time, so you see progress steadily instead of waiting for a single big delivery.
How do revisions work?
Revisions are included and stay part of the active request until it meets the brief. The request is only considered done once you are satisfied.
Which technology stacks are supported?
We focus on calculators, interactive tools and embeddable widgets built with standard web technologies, and we can deliver as pull requests into your existing repository when your stack allows it. If a request needs a stack we cannot support well, we will tell you before you subscribe.
Can I pause or cancel?
Billing is monthly, and you can request a pause or a cancellation before your next monthly renewal. Cancellation prevents any future renewals. The period you have already paid for stays available until its scheduled expiry. Unused days are not automatically accumulated or transferred unless a specific written pilot agreement says otherwise.
More questions
What does “queue as many requests as you like” mean?
It refers to your queue, not to simultaneous delivery. You can add as many requests as you want and reorder them at any time. It does not mean unlimited hours, unlimited parallel work, or a guaranteed number of deliveries in a given period — we work one active request at a time.
Are there meetings?
There are no recurring meetings. Communication is asynchronous and written, which keeps a clear record and protects focus. A short kickoff can be arranged when it genuinely helps.
Who owns the work?
After payment, you receive the rights to the project-specific deliverables defined in your pilot terms. Fidamen keeps ownership of, and rights to, its pre-existing tools, reusable components, methods and templates. Any third-party or open-source materials remain subject to their own licenses, and those dependencies are declared in the delivery.
What is not included?
Open-ended applications, full redesigns, complete migrations, general stack maintenance, emergencies or 24/7 SLAs, guarantees of ranking, traffic or revenue, and legal, tax or financial advice are out of scope.
Start with one concrete calculator problem.
Send the existing tool, target query or business use case. We will tell you whether an audit, a launch sprint or no engagement is the rational next step.