Shifting your retirement date by just one month can simultaneously trigger health insurance regional conversion, spouse's dependent status loss, gaps in children's insurance coverage during military service, and National Pension credit losses — yet no tool shows this cascade effect at a glance. Each agency's calculator covers only individual items, so retirees cannot see how moving retirement from March to April changes the entire family's annual insurance costs, commonly resulting in overpaying $1,500–$3,000 per year by missing the optimal retirement timing.
Solution
1) A retirement date slider that displays cascading changes to health insurance, National Pension, and employment insurance status for the retiree, spouse, and dependents on an interactive timeline. 2) Per-family-member status change alerts with automatic optimal retirement month recommendation. 3) PDF export of a side-by-side annual cost comparison table for each affected item.
Target: Ages 55–62 currently employed at large corporations or public institutions, with a stay-at-home spouse or adult children in graduate school or military service
Revenue Model: Basic simulation free; cascade analysis for 3+ family members ~$7.50/month Subscription; per-session referral fee for linked tax accountant or labor attorney consultations
Ecosystem Role: Infrastructure
MVP Estimate: 1_month
NUMR-V Scores
N Novelty
4.0/5
U Urgency
4.0/5
M Market
4.0/5
R Realizability
3.0/5
V Validation
5.0/5
NUMR-V Scoring System
N Novelty
1-5
How uncommon the service is in market context.
U Urgency
1-5
How urgently users need this problem solved now.
M Market
1-5
Market size and growth potential from proxy indicators.
R Realizability
1-5
Buildability for a small team with realistic constraints.
V Validation
1-5
Validation signal quality from competition and demand data.
N=.15 U=.20 M=.15 R=.30 V=.20
Feasibility (56%)
Tech Complexity
24.7/40
Data Availability
19.2/25
MVP Timeline
12.0/20
API Bonus
0.0/15
Feasibility Breakdown
Tech Complexity
/ 40
Difficulty of core implementation stack.
Data Availability
/ 25
Practical availability and cost of required data.
MVP Timeline
/ 20
Expected time to ship a usable MVP.
API Bonus
/ 15
Bonus for viable public API leverage.
Market Validation (76/100)
Competition
10.0/20
Market Demand
20.0/20
Timing
16.0/20
Revenue Signals
10.5/15
Pick-Axe Fit
12.0/15
Solo Buildability
7.0/10
Validation Breakdown
Competition
/ 20
Signal quality from competitor landscape.
Market Demand
/ 20
Demand proxies from search and mention patterns.
Timing
/ 20
Fit with current shifts in tech, behavior, and regulation.
Revenue Signals
/ 15
Reference evidence for monetization viability.
Pick-Axe Fit
/ 15
How well the concept serves participants in a trend.