GRE Math Knight vs LienClock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
GRE Math Knight
Practice GRE math concepts by battling monsters. This game covers arithmetic, algebra, geometry, and data analysis, with formula scrolls and mini-games to enhance learning. Become a GRE math knight and save the kingdom.
- GRE math concept practice
- Arithmetic, algebra, geometry, data analysis
- Formula scrolls
- Mini-games
- Monster battling gameplay
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Our kingdom is held hostage by evil monsters whose only weakness is GRE math! Free to start: play the Swamp and Training free, then unlock the Desert, Plains and Tundra with a one-time purchase. No subscription, no ads. In GRE Math Knight, you'll hone your math skills by practicing the most commonly tested GRE math concepts. First, build your skills on the training ground, where you can drill the basics like mental math, fractions, percents, and more, then travel to four different biomes to solve arithmetic, algebra, geometry, and data analysis GRE math questions in order to defeat the monsters. You'll find scrolls with math formulas along the way to aid you in your quest, and fun games to play to break up your studying. Can you save the kingdom and become a true GRE math knight?
LienClock
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LienClock calculates supported U.S. mechanics lien and payment-bond deadlines from actual project events. CALCULATE AND TRACK Choose the state, your contracting role and the actual project type. Confirm the statutory conditions and enter the furnishing, completion, notice or acceptance dates required for that scenario. Texas monthly notices use each unpaid furnishing month. Expand Calculation basis to review event dates, timing rules, holiday treatment and official sources. Blockers explain the reason and next step. Unsupported conditions stop calculation; public projects never receive property-lien filing dates. Save a calculation as a project, schedule local reminders, export a calendar file, or use Pro to add dates directly to iPhone Calendar. Projects flag past-due dates, rules needing review and reminders needing setup. Pending reminder status reflects this iPhone; delivery depends on iOS. Track upcoming saved dates with Pro widgets. REFERENCE COVERAGE AND CALCULATION SCOPE The reference library covers all 50 states, DC and the Federal Miller Act. Automatic calculations cover selected scenarios and vary by state, role and project type. Private-project rules include supported subcontractor scenarios in all 50 states and DC; other roles, remedies and exceptions have narrower coverage. Selected public-project scenarios span 50 states and DC, with limited role, regime and remedy coverage. HI/IN/MT/NM provide claim or notice dates only; IN covers local held-contract-fund claims. SD covers mandatory-bond failure and joining an existing claimant bond action. KY/MO/WV action limits require confirmed accrual and bond conditions. Unverified remedies and calendar boundaries require review, including with Pro. Federal Miller Act calculations require an applicable federal payment bond and a supported claimant tier; public ownership or federal funding alone does not establish coverage. Verified rules apply supported weekend and holiday extensions. Unverified calendars, extraordinary closures, tolling and exceptions require individual review. FREE AND PRO Free includes supported calculations in CA, TX, FL, NY, IL and PA, plus the Federal Miller Act; one saved project; calendar-file export; custom local reminders at 30, 14, 7, 3, 1 or 0 days before a deadline; and optional biometric App Lock. Pro unlocks supported calculations beyond the six free states, Calendar direct write, widgets, unlimited saved projects, calculation history and the state rule reference viewer. Purchasing Pro does not make unsupported scenarios available. Pro Annual: $9.99 USD per year. Eligible customers may receive a 14-day free trial. Pro Lifetime: $19.99 USD once, with no renewal. Annual subscriptions renew automatically unless canceled at least 24 hours before the current period ends. Eligible trials convert to the paid yearly subscription unless canceled at least 24 hours before trial end. Payment is charged to your Apple ID; renewal is charged within 24 hours before the period ends. Manage or cancel in Apple subscription settings. Apple handles refund requests. The purchase screen shows Apple's current localized price and applicable offer. ON YOUR IPHONE No login, account, analytics or cloud sync. Project data stays on this iPhone. Calendar and notification permissions are requested when you use those features. There is no built-in JSON backup or import. Standard iOS device backups may include saved projects. Previously exported Calendar events remain independent and need manual review after rule updates or app deletion. iPhone only. REFERENCE ONLY Statutes and their interpretation can change. LienClock does not recommend filing strategies, draft claims, predict outcomes or guarantee deadlines. Consult a licensed construction attorney for your facts and filing decisions. Support: captainlongevity@gmail.com Privacy: https://app-legal-pages.vercel.app/lienclock/privacy Terms: https://app-legal-pages.vercel.app/lienclock/terms
Screenshots
Verdict
The clearest difference is in-app purchases: GRE Math Knight at none against LienClock's 2. GRE Math Knight also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.2). LienClock's advantage is update cadence (weekly vs monthly). On price and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. LienClock sells 2 in-app purchases, starting at $9.99 per year. GRE Math Knight asks for nothing beyond the download.
GRE Math Knight ships an update monthly, LienClock weekly. The most recent releases landed on November 3, 2026 and October 28, 2026 respectively.
| Parameter | GRE Math Knight | LienClock |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (52 ratings) — better | — |
| Positive reviews | 53.3% of reviews | — |
| Number of ratings | 52 — better | — |
| Update frequency | Monthly | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 17.2 |
| Further details — not scored | ||
| Size | 133 MB | 6 MB |
| Age rating | 9+ | 4+ |
| Developer | Vince Kotchian Test Prep | 慧慧 高 |
In-app purchases
GRE Math Knight
No in-app purchases
LienClock
- Pro Annual14 Days trial$9.991 Year
- Pro Lifetime$19.99





