46 years of legacy software. PE ownership. Windows-only. Here's what you need to know before choosing your billing software.
Follow the money. Understand who's really building your software.
Software Technology LLC creates Tabs3 in Lincoln, Nebraska. Desktop billing software for law firms. Dan Berlin becomes president and CEO in 1984.
Private equity takes control. The company is now a portfolio asset with return expectations to meet.
Under PE ownership, Tabs3 acquires cloud-based competitor CosmoLex. The roll-up begins. Combined customer base exceeds 100,000 legal professionals.
Another private equity firm, Lightyear Capital, forms ProfitSolv specifically to acquire and consolidate legal billing software companies. They acquire Rocket Matter, TimeSolv, and LexCharge.
Tabs3 changes PE hands. Now part of the ProfitSolv portfolio alongside Rocket Matter, TimeSolv, CosmoLex, LexCharge, and ImagineTime. Six legal software products under one PE-backed roof.
Every monthly payment goes to ProfitSolv, which answers to Lightyear Capital. You're not funding product development. You're funding investment returns.
Tabs3 was built in 1979. That's before the Macintosh existed. Before Windows existed. The architecture shows its age. Multiple reviewers describe the interface as "outdated" and "clunky." After 46 years, you'd expect more polish.
That's the actual title of a verified user review. The review continues: "It is very difficult to navigate and hard to learn... Instead of one platform, there are multiple programs for different functions. Sometimes, to complete a single transaction you have to use two or even three of the programs."
"There is a learning curve. The cost shows in some of the functionality." For software that's had nearly five decades to improve its user experience, a steep learning curve in 2026 suggests the architecture itself may be the problem.
"System crashes and they seem to be more concerned about upselling to the better system." When the response to stability issues is to sell you a more expensive tier, you start to wonder who the software is really built for.
After 46 years of development, Tabs3 still has no native Mac support. Their system requirements are explicit: Windows 11/10, Windows Server only.
Tabs3 requires Windows. Period. The official system requirements list Windows 11/10 and Windows Server 2025/2022/2019/2016. No macOS. No Linux. No web app that actually works.
To run Tabs3 on a Mac, you'd need Parallels Desktop ($100/year) running Windows ($100+). That's $200+ just to run billing software. And you're still not running native Mac software.
Running Windows in a virtual machine means sharing RAM, CPU, and storage with your Mac. Your billing software competes with your other apps for resources. Slowdowns happen. Crashes happen. That's the tax you pay for using software that ignored Mac users for 46 years.
No integration with Apple Calendar. No integration with Apple Contacts. No Quick Look support. No Spotlight indexing. No Handoff. None of the Mac features that make your work seamless. You're running Windows software in a box.
Side by side. The whole story.
| What matters | Tabs3 | TimeNet Law |
|---|---|---|
| Platform | Windows 11/10 & Server only | Native Mac, iPhone & iPad (Apple Silicon) |
| Running it on a Mac | Parallels + a Windows license ($200+/yr) | Runs natively, nothing to emulate |
| Owner | ProfitSolv (PE, Lightyear Capital) | Independent developer, 20+ years |
| Pricing model | $40-124 per user / month, forever | $479.99 once, you own it |
| 5-year cost (solo) | $2,400 - $7,440 | $479.99 |
| Upgrades | "Buy whole new software" | Included |
| Apple Calendar, Contacts, Spotlight | None | Built in |
| Built-in AI | None on your device | Free, private, on-device (Oasis) |
| AI privilege after US v. Heppner | At risk in the cloud | Stays on your device |
| If you stop paying | Access stops | Nothing, it's already yours |
| Interface | "Outdated, clunky" (verified reviews) | Modern, Mac-native |
"Frustration with the program led to a transition to other software."
Verified Capterra Review
"Unethical business practices. Maintenance is not good. Poor treatment of customers... Every year, the price went up. The service I received was exactly the same, but they decided to charge me more and more."
Verified Capterra Review
"Tabs is just so clunky and outdated, doesn't have nearly as many [features]..."
r/LawFirm
"It wasn't until I looked at other time/billing software that I realized there was so much more available."
Verified Capterra Review
"You basically have to buy whole new software rather than a nominal upgrade fee."
"Every cloud app is racing to bolt on AI. They all work the same way."
It lives on their servers, meters every question, and every word you feed it, your client's secrets, your strategy, your privileged work, lands on someone else's machine. A federal judge just ruled that kind of data isn't privileged anymore (US v. Heppner). So you'd be paying extra to hand your client's confidences to a system that can be subpoenaed. Tabs3 will be no different.
Oasis doesn't work like that.
It runs on your Mac, iPhone, and iPad. Your data never leaves the building. Nothing trains a model. Nothing gets metered. And the assistant, First Mate, is free for life, because it costs me nothing to run. Tabs3 can't match free. Not because they won't. Because every answer they give costs them money, and every answer mine gives costs me nothing. That isn't a pricing trick. It's the difference between renting a mainframe and owning your computer.
$40/user/month. Cloud tier is $124/user/month. Over 5 years, you've paid $2,400 to $7,440. You own nothing. Price can increase any time. If you stop paying, your access stops.
One purchase. You own it. No monthly fees. No price increases. No PE investors demanding growth. Works offline. Your data stays on your Mac.
Tabs3 has been around for 46 years. It has loyal users. It works for Windows-based firms that have built their workflows around it.
But if you're a Mac user, Tabs3 wasn't built for you. It was built before the Mac existed, and after nearly five decades, they still haven't built native Mac support. That tells you everything about their priorities.
You chose a Mac for a reason. Your billing software should honor that choice, not fight against it.
TimeNet Law was built by a Mac user, for Mac users, over two decades. It runs natively on Apple Silicon. It syncs with Apple Calendar and Apple Contacts. It works offline. It keeps your data local. And it costs $479.99 once.
No PE investors. No roll-up portfolio. No Windows virtualization required. Just software that respects your platform and your practice.
One Click Billing. Smart rounding. Non-destructive timers. Split billing by party. Text expansion before TextExpander was even a product. I shipped every one of those first, then watched the big cloud apps roll out their own version a year or two later. That's the tell. I lead. They follow.
But here's where they can never follow.
Private AI on your own machine. A complete, permanent history of every change, restorable with one click, even after you quit and relaunch. Working on a plane with no Wi-Fi. Your data that never leaves your Mac. You cannot bolt any of that onto a cloud product. Not with a sprint. Not with a roadmap. Not with a private-equity war chest.
Download the free trial. No credit card. No sales calls. Just Mac-native billing software you can actually evaluate on your actual Mac.
Download Free TrialTabs3 is owned by ProfitSolv, a legal software holding company backed by Lightyear Capital (private equity). ProfitSolv also owns Rocket Matter, TimeSolv, CosmoLex, LexCharge, and ImagineTime. Thompson Street Capital Partners previously owned Tabs3 before selling to ProfitSolv in 2021.
No. Tabs3 is Windows-only software. To use it on a Mac, you would need to run Windows through Parallels or Boot Camp, adding cost and complexity. After 46 years of development, Tabs3 still has no native Mac support.
Tabs3 OnSite Subscription is $40/user/month. Tabs3 Cloud Subscription is $124/user/month. Over 5 years, that's $2,400 to $7,440 per user. TimeNet Law is $479.99 one time.
Yes. TimeNet Law can import your client and matter data. Most attorneys complete the migration in a few hours. You'll work directly with the developer who built TimeNet Law, not a support queue.
No, and that's intentional. TimeNet Law runs locally on your Mac. Your data never leaves your computer. There's no third-party server holding your client information. For attorneys who take data privacy seriously, local-first is the only option that makes sense.