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← HandbookPartner venture
True Access
South Africa’s first community accessibility-mapping platform — disabled people discover and rate accessible spaces; businesses get SANS 10400-S compliance scoring. One codebase for iOS, Android and Web.
View the product pageThe problem
4.2M South Africans live with disability and can’t safely survey a venue before an expensive, unreliable trip. SANS 10400-S mandates accessible buildings, but no platform aggregates real-world SA accessibility data.
Architecture
How it’s wired
Supabase + PostGIS is the source of truth for locations; an Edge Function publishes verified locations to Mapbox as visual tiles. Payment truth arrives via an HMAC-SHA512-verified Paystack webhook. A 50/50 co-venture.
1
codebase, 3 platforms
0–100
SANS compliance score
5
Deno Edge Functions
4
user roles
Stack
Expo SDK 52 (Expo Router)React Native 0.76TypeScriptNativeWindSupabase (Postgres + PostGIS + Edge Functions)TanStack QueryZustandMapbox (rnmapbox / react-map-gl)Paystack
AI
No AI in production — listed only on the future roadmap, so it is not claimed as a current capability.
Data model
~10 core tables · PostGIS · RLS
- locations (PostGIS GIST index, compliance_score 0–100, mapbox_feature_id)
- accessibility_features (SANS 10400-S checklist: 9 required ×10 + 8 optional ×5, MAX 130)
- audit_submissions (JSONB checklist) · businesses (plan_tier) · orders (paystack_reference)
Key decisions
Why it’s built this way
ADR-01
A universal Expo Router app
- Context
- Need iOS, Android and Web.
- Decision
- One Expo codebase; web renders to React DOM so full Mapbox GL JS runs.
- Consequence
- Shared business logic across three platforms; only map/storage/notifications/picker are platform-split.
ADR-02
Supabase is the source of truth for locations, not Mapbox
- Context
- The data is the core monetizable asset.
- Decision
- Own the data in Postgres + PostGIS; publish to Mapbox Datasets only for visual tiles via an Edge Function on verify.
- Consequence
- Spatial queries + a licensable GeoJSON export the platform fully controls.
ADR-03
A weighted SANS 10400-S compliance score
- Context
- A legally-defensible 0–100 accessibility metric is needed.
- Decision
- Required features ×10, optional ×5, scaled to 100, each citing a SANS clause.
- Consequence
- Scores double as defensible documentation and drive the compliance-products funnel.
ADR-04
Offline + data-light first
- Context
- Load shedding and high SA data costs.
- Decision
- useOfflineSync detection + image compression to 1200px; cache-invalidate on reconnect.
- Consequence
- Usable during outages.
The hard parts, solved
One cross-platform map
A single MapView type contract resolves to @rnmapbox/maps (native) or react-map-gl (web) by Platform.OS — one API, two engines.
The B2B compliance flywheel, closed end-to-end
Audit score → gap analysis → compliance-products CTA → re-audit request → Paystack subscription → HMAC-SHA512 webhook confirmation → plan-activated push, plus a role-scoped GeoJSON data-export API.
Sourced from TrueAccApp — .claude/ARCHITECTURE, SCHEMA, BUSINESS, BUILD_PHASES.
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