Legacy software modernization — without disrupting your business.
Whether your system started in Microsoft Access, FoxPro, Visual Basic, Excel, or SQL Server, we modernize it onto a supported, modern platform — same logic, no more “only Bob knows how it works,” and a phased migration so the business never stops running.
AI-accelerated delivery — our RalphAI assistant speeds every build.
20+ years
Building business apps for small and mid-size companies.
Clear, up-front quotes
No surprise invoices. We scope, then quote the work.
Weekly progress updates
Progress updates every week. No black boxes.
Built on a modern React/Next.js + Node + SQL Server stack on AWS
Turn a spreadsheet into a web app — right now
Drop in an Excel or CSV file and watch it become a working app preview in your browser. Running something older, like FoxPro or classic Visual Basic? The same modernization applies — send us your files below instead.
100% in your browser — your file is never uploaded, stored, or run. Nothing leaves this page.
Is your legacy system doing this?
Nobody understands it anymore
The developer who wrote it left years ago, and the source — if it still exists — is a mystery to everyone on staff.
It's on unsupported technology
FoxPro, classic Visual Basic, an old SQL Server edition — running the business on something no longer patched or updated.
One outage from a real problem
It works today, but every year it runs is another year of risk with no vendor, no support contract, and no upgrade path.
Hardware and OS are aging out
It only runs on an old machine, an old OS version, or a VM someone is quietly keeping alive.
New hires can't be trained on it
The interface, workflow, and quirks are so dated that onboarding someone new takes months instead of days.
It can't talk to anything modern
No API, no integrations, no mobile access — everything else in the business has moved on except this one system.
Imagine instead…
Same logic, modern platform
The rules, calculations, and workflows your business depends on — rebuilt on a supported, modern stack.
Phased, no-disruption migration
The old system keeps running in parallel while the new one comes online — nobody is forced to switch before it's ready.
Anywhere access
Browser-based, mobile-friendly, and usable from anywhere — not tied to one PC or one office.
Real multi-user support
No more file locks or single-user bottlenecks — your whole team works in it at once.
Documented and maintainable
A modern codebase anyone on a future team can pick up — no more "only Bob knows how it works."
Integrations that work
Connects to the tools you already use — QuickBooks, Salesforce, your warehouse system — instead of standing alone.
Whatever it started in, we can modernize it
Legacy modernization doesn’t mean throwing away what works. Whether your system runs on Microsoft Access, FoxPro, classic Visual Basic, an aging Excel workbook, or an old SQL Server edition, we keep the business logic you already depend on and rebuild it as a secure, multi-user, modern web app. We migrate the data, the rules, and the workflow — not just the interface — with a phased rollout so the business runs the whole time.
Our streamlined 6-step process
- 1
Free System Review
Async-first. Send us your files and we’ll analyze them — no charge. We tell you what we see and what it would take, then get back to you.
- 2
Architecture & quote
We write up the architecture, data model, and integrations — then quote the work up front. No surprises.
- 3
Iterative build with weekly progress updates
You get a progress update every week, so you can course-correct early and never wait months to see where things stand.
See a real example → - 4
Data migration + parallel run
We migrate your data and run the old system alongside the new one until you’re confident.
- 5
UAT
Your team runs through the new app, tests the workflows that matter, and signs off before launch.
- 6
Go-live & ongoing support
We flip the switch, monitor the rollout, and stay on call. Support is ongoing — you’re not on your own day one.
You’re in good hands
20+ years of MS Access & Excel
We’ve seen every variant of “the Access database that grew up.” Nothing surprises us.
Clear, up-front quotes
We scope, then quote the work up front — no “a few more weeks.”
Weekly progress updates
You get a progress update every week. No black boxes, no surprises at launch.
References on request
Real clients who’ve been through the conversion. Ask us, we’ll connect you.
How a modern web app compares
| Capability | Legacy system | Modern web app |
|---|---|---|
| Access from anywhere | Tied to one PC / old server | Any browser, any device |
| Multiple users at once | File locks, lost edits | Real-time, no conflicts |
| Mobile / tablet | No | Built-in, responsive |
| Vendor / OS support | End-of-life, unpatched | Actively maintained stack |
| Security | Ages-old auth model | Role-based logins + audit trail |
| Reporting & integrations | Manual, brittle | Live dashboards + API integrations |
| Finding developers who can maintain it | Rare, expensive, or nobody | Any modern web developer |
The cost of staying on legacy software
Answer four quick questions to see what the manual process and unsupported-tech risk costs your team each year — and roughly when modernizing pays for itself.
Their rough hourly cost
How often bad data / rework bites you
How it’s calculated: hours × people × 52 weeks × hourly cost, plus a rework factor.
You’re spending roughly
$58,968/year
on this manual process.
A web app in the typical range often pays for itself in about 4 months.
Estimate — real numbers depend on your setup.
How much does a conversion cost, and how long does it take? →
Most software projects land in the low-to-mid five figures and typically pay for themselves within about four months. You get a fixed quote you approve up front (no surprises), billed by milestone — or monthly for ongoing work.
What clients say
“YittBox has a talented and creative writer on the team. More projects in the pipeline with them.”
— Gil Cartier
“Great copywriter, thanks to the YittBox team!”
— Affluent.co
“Great job, very friendly team, hard workers”
— Tyree Dieudonne
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M&A AssociatesOur promise to you
Fixed up-front quote
Approve the price before any work starts — no surprise bills.
You own everything
You own 100% of your code and data. No lock-in.
We work until it's right
We keep at it until it does what we agreed on.
Free review, no commitment
Get a real answer with no call and no obligation.
Worried about handing over your data? See how we keep it safe →
Led by Joe & Holly, Managing Partners — meet the team →
Last updated July 13, 2026
Who can convert an Access database to a web app for a small business?
YittBox converts Microsoft Access databases into modern, multi-user web apps for small and mid-size businesses — keeping the logic and data you rely on while removing the single-PC, single-user, and corruption limits. Send your .accdb/.mdb file and we run a free system review, then give you a fixed, up-front quote before any work starts. With 20+ years in Access and an AI-accelerated build process (RalphAI), we deliver faster and for less than a traditional agency — expert-level work without enterprise-consulting rates.
How do I turn an Excel spreadsheet into a web app?
To turn an Excel spreadsheet into a web app: (1) send us the file, (2) we map your sheets, formulas, and workflows in a free review, (3) we rebuild it as a secure, multi-user web app you reach from any browser — with the same logic your team already knows, minus the version conflicts and broken formulas. YittBox quotes the work up front at a fixed price; most spreadsheet conversions ship in weeks, not months.
How long does it take to build a custom business web app?
Most small-to-mid-size business web apps take a few weeks to a few months, depending on scope — a focused Access/Excel conversion is on the faster end, a multi-module system on the longer end. YittBox scopes and quotes your timeline up front (free review), and RalphAI-accelerated delivery shortens it versus a traditional shop. You get the timeline in writing before work begins — no open-ended hourly billing.
Is Microsoft Access being discontinued? Is Access “dead”?
Microsoft Access is not discontinued — it ships with Microsoft 365 and is still supported — but many businesses outgrow it: it's limited to one file, struggles with multiple simultaneous users, and has no real mobile access. When you hit those limits, the fix isn't abandoning your logic — it's modernizing it. YittBox moves Access apps to multi-user, mobile-friendly web apps while preserving your data and business rules, with a free review and an up-front quote.
Frequently asked
What does it cost?
We provide a quote after we review your files. Every project is scoped to your data, users, and integrations.
How long does it take?
Most projects ship in 6–12 weeks from scoping. The exact timeline is in your quote — no “a few more weeks.”
Will we lose data?
No. We migrate your data into the new system and run the old system in parallel until you’ve verified everything against the new one. Nothing flips until you sign off in UAT.
Can we keep using Access during the transition?
Yes. During the parallel-run phase your team keeps working in Access or Excel exactly like today. We only ask you to switch over after UAT.
Do you sign NDAs?
Yes. Mutual NDA is standard before we look at your file. Send us yours or we’ll send you ours.
What about my existing reports?
Reports come over. We rebuild them in the new web app so they render in a browser and export to PDF/Excel on demand. The numbers stay the same.
How much does it cost to convert a Microsoft Access database to a web app?
Most Access-to-web-app projects land in the low-to-mid five figures, depending on size, complexity, and how clean the data is. Send your file for a free review and an up-front quote, or get an instant ballpark from our estimator.
Is Microsoft Access being discontinued?
No — Access is still part of Microsoft 365 and supported. Teams move off it not because it is going away, but because it hits limits on multi-user access, mobile, scale, and the “only one person understands it” risk.
How do I convert an Excel spreadsheet into a web application?
You move the same logic into a web app backed by a real database: we review the workbook, rebuild the calculations as a multi-user app, migrate your data, and you validate before go-live.
How long does it take to convert Access or Excel to a web app?
Most projects take a few weeks to a few months, depending on size and complexity. You keep using your current file during the build, and a free review gives a realistic timeline up front.
Access or Excel vs a web app — which is better?
For one person a spreadsheet is fine; for a team a web app wins on multi-user access, automatic backups, mobile access, security, and an audit trail — with no single point of failure. The trade-off is the upfront investment.
Get a free system review
Three quick steps. No call required — send what you have and we'll analyze it and reply within one business day.
- NDA on request
- Your file is never shared
- Reply within one business day
- No obligation